Trojan Horse Removal

I have Norton AntiVirus for Mac which runs a full scan once a month. My recent scan shows 4 trojan horses all with the same name in the Java/Cache/6.0/33 file. Norton is unable to remove, quarantine or fix these. I've Googled the virus and no results show up so I don't know if this is a true Tojan Horse or a problem with Norton detection. I have Apple Care so can take the laptop in to the Apple store but not sure if it's necessary yet. The laptop does connect to a wireless drive at my office that is Windows based. Any ideas are welcome - Thanks.

OMGosh... I think I may know this one. (I generally don't speak mac or pc). I'm a first time mac user for now three weeks. last weekend, after surfing all day, my PB had some scary box open with "DANGER" blah blah... than lots of horse blah blah..."INFECTED"
I freaked out and asked my husband and he told me to get off line! and started out to the store with "I told you so" to get some virus soft w.
Than I remembered that I read something about how Apple is safest and doesn't get virus or something. so I searched for a bit but couldn't get a quick answer on line. so, I grabbed my PB and ran to the nearest Apple store.
After quick look, apple guys said that it was all a bloody marketing scam to scare people to buy their soft w. He was right, as soon as we rebooted, all was fine. He explained something about why apple isn't open to these sickness like PC...blah, blah... I didn't understand and I was looking at all the pretty apples that I had already planned on switching my entire house with... LOL. My husband would have an attack of some sort.
So, I hope this is the same case for you. My husband still don't believe or understand why apple isn't open to same thing as PC. To his defense, I have seen soft w. for virus for mac. so..... can someone answer if I need to purchase virus SW like my husband PC?
AND please to all the SMART apple guys out there, simple yes or no in English would be so appreciate it. Not that I hear "blah blah" when u speak apple, but I just want to understand what II need to know. THANK U APPLE GUYS!! UR AWSOME.

Similar Messages

How do I remove Trojan horse OSX/FakeAlert.B codecm_uploader from my macbook?

How do I remove Trojan horse OSX/FakeAlert.B codecm_uploader from my macbook? My AVG AntiVirus keep putting up a pop up window to say that it's blocked the threat from spreading and I've to consider deleting the infected file. When I search for the file, I can't find it. It pops up literally every 30secs!

First, you need to get rid of AVG. It may have alerted you to this, but in general it's not much good on the Mac.
Second, that indicates that you are infected with the FkCodec, aka Codec-M, adware. See my Adware Removal Guide for instructions on removing it. Be aware that AVG might interfere with your attempts to remove it, thinking that it is protecting you.
(Fair disclosure: The Safe Mac is my site, and contains a Donate button, so I may receive compensation for providing links to The Safe Mac. Donations are not required.)

Trojan horse virus..can't remove

Greetings,
recently I downloaded a video reader from a website.....but since I've done this it's taken over all the google, yahoo, and ask paid links and instead launched a website that directs me away from the paid links.
I've tried a few virus removers but they don't seem to remove the virus. Tried to clear all my cookies and cache..but it still comes back..need Help!
Any ideas??
best regards

You downloaded a file claiming it was a video codec from a **** site, which is why you now have a Trojan Horse. To remove it, download and run this program: DNSChanger Removal Tool, then reboot your Mac and the problem should be gone.
To avoid this problem in the future, don't visit **** sites, and definitely don't download things that are not from trusted sources, or at least legitimate sources. All legitimate video codecs come from real companies with real names and information about their codec.
Mulder

I have at trojan horse.norton can not remove or quarrantine.virus is 36c09694-167c0775.Help

I have a trojan horse virus.36c09694-167c0775 Norton can not remove or quarrantine.Help

I don't think anyone here will be able to identify which trojan that is, or whether, even, it's a Mac trojan. I would contact them. Only they will know what that code is supposed to mean.
BTW, there is no such animal as a trojan horse virus. There are trojans and viruses, two entirely different things. Thre are no viruses at all for Mac.

My computer has been infected with a Trojan Horse. It has completely taken over my Mac email account and was sending out malicious email to everyone in my address book. At the same time it infected my iPhone---I am no longer able to receive or send emai

My computer has been infected by a Trojan Horse. It has taken over my Mac email account and began sending out malicious emails to everyone in my address book. I cleared out my MAC address book and began using my AOL email account. It took a few days and then my AOL email account was infected and has now been send out malicious email to all my contacts for over a month. It has also infected my iPhone--I am no longer able to send or receive emails on my iPhone. Also, once the Trojan Horse began using my AOL email it completely blocked me from using my MAC account by sending never ending popups asking for my email password to access my MAC email account, but it never accepts my pass word. The TH has also slowed down everything on my computer. It's like I am working on an old PC with dial up connection instead of the high speed digital connection that I have. The little color wheel spins constantly as I wait for sometimes over a minute for a page to pull up. If it pulls up at all. I have tried to use the 2 disks that came with my computer to completely remove everything on my computer and then reinstall all the programs, but I am not allowed to sweep my computer clean. I thought maybe my disks that came with my computer were defective so I called Apple and they sent me 2 new disks. I am not able able to clear my computer with the 2 new disks either. I have done this before successfully so it's not something new to me. I do remember when I believe my computer became infected: I had googled an unusual sewing term, and I was opening what appeared to be legitimate sites, when all of a sudden a pop up appeared that said that my computer had been infected. I immediately shut my computer off, but it was too late. I downloaded a virus program for Mac, and it has never found a virus or problem at all. I think it is part of this Trojan Horse, but I am unable to delete it from my computer. It refuses to uninstall. The Mac Trojan Horse is real and it is terrible. If anyone has any suggestions for me I would be very appreciative,
Beth
vu

Install ClamXav and run a scan with that. It should pick up any trojans.
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
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I think I have some Malware/Trojan Horse on MacBook Pro. How to get rid of it?

My MacBook Pro has worked perfect for the last 2 years, but over the last 2 days when I am on Chrome it has started clicking onto random websites when I click other links, and showing certain words as underlined and as hotlinks. I think I recognise that from having a PC as Malware or Trojan Horse? What is the best way to remove this as I have read through a few threads on here and they advise not downloading any anti virus software as it slows down your Mac instead of helping.
<Post Edited By Host>

You installed the "VSearch" trojan, perhaps under a different name. Remove it as follows.
Malware is constantly changing to get around the defenses against it. The instructions in this comment are valid as of now, as far as I know. They won't necessarily be valid in the future. Anyone finding this comment a few days or more after it was posted should look for more recent discussions or start a new one.
Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
/Library/LaunchAgents/com.vsearch.agent.plist
Right-click or control-click the line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item named "com.vsearch.agent.plist" selected. Drag the selected item to the Trash. You may be prompted for your administrator login password.
Repeat with each of these lines:
/Library/LaunchDaemons/com.vsearch.daemon.plist
/Library/LaunchDaemons/com.vsearch.helper.plist
/Library/LaunchDaemons/Jack.plist
Restart the computer and empty the Trash. Then delete the following items in the same way:
/Library/Application Support/VSearch
/Library/PrivilegedHelperTools/Jack
/System/Library/Frameworks/VSearch.framework
~/Library/Internet Plug-Ins/ConduitNPAPIPlugin.plugin
Some of these items may be absent, in which case you'll get a message that the file can't be found. Skip that item and go on to the next one.
From the Safari menu bar, select
          Safari ▹ Preferences... ▹ Extensions
Uninstall any extensions you don't know you need, including any that have the word "Spigot," "Trovi," or "Conduit" in the description. If in doubt, uninstall all extensions. Do the equivalent for the Firefox and Chrome browsers, if you use either of those.
Reset the home page and default search engine in all the browsers, if it was changed.
This trojan is distributed on illegal websites that traffic in pirated content. If you, or anyone else who uses the computer, visit such sites and follow prompts to install software, you can expect much worse to happen in the future.
You may be wondering why you didn't get a warning from Gatekeeper about installing software from an unknown developer, as you should have. The reason is that this Internet criminal has a codesigning certificate issued by Apple, which causes Gatekeeper to give the installer a pass. Apple could revoke the certificate, but as of this writing, has not done so, even though it's aware of the problem. This failure of oversight has compromised both Gatekeeper and the Developer ID program. You can't rely on Gatekeeper alone to protect you from harmful software.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.

Can't find file for Trojan Horse on my MacBook

Anyone seen this before?
I have the Norton Antivirus Program installed on my MacBook.
I believe an attack occurred while I was looking through the Apple Support Forums for help with a QuickTime problem and accidentally clicked on the following link: http:www.smacktalkpaintball.com/video/
The Norton Warning came up and I hit the delete option and then set Norton to scan manually.
The following came up at the end of the scan:
Virus "bof.jar-51a4bd07-3d4b399d.zip" detected, Today at 7:24 AM. Repair failed.
/Users/Owner/Li...bd07-3d4b399d.zip Trojan Horse infected
I was not able to locate either of these files anywhere on my computer.
I have two external hard drives that I use to back-up data, but neither of them were connected at the time of the attack, and nothing else was connected when I ran the virus scan.
I do not have Windows installed on this MacBook - Mac OS X, Version 10.5.8,

Norton was able to detect the Trojan whereas MacScan was not, but Norton was not able to remove it
That sounds an unlikely outcome on both counts. Norton anti-virus is just that: anti-virus, and I would not trust it to deal with trojans.
Are you sure you actually installed a Trojan?
If you allow a Trojan to be installed, the user's DNS records can be modified, redirecting incoming internet traffic through the attacker's servers, where it can be hijacked and injected with malicious websites and pornographic advertisements. The trojan also installs a watchdog process that ensures the victim's (that's you!) DNS records stay modified on a minute-by-minute basis.
You can read more about how, for example, the OSX/DNSChanger Trojan works here:
http://www.f-secure.com/v-descs/trojanosxdnschanger.shtml
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://macscan.securemac.com/
The DNSChanger Removal Tool detects and removes spyware targeting Mac OS X and allows users to check to see if the trojan has been installed on their computer; if it has, the software helps to identify and remove the offending file. After a system reboot, the users' DNS records will be repaired.
(Note that a 30 day trial version of MacScan can be downloaded free of charge from:
http://macscan.securemac.com/buy/
and this can perform a complete scan of your entire hard disk. After 30 days free trial the cost is $29.99. The full version permits you to scan selected files and folders only, as well as the entire hard disk. It will detect (and delete if you ask it to) all 'tracker cookies' that switch you to web sites you did not want to go to.)

SPY script/ Trojan Horse active on my MAC BOOK PRO

Hello, Since two days I have noticed a small pop up every other minute when I am connected to the internet (which I do wireless) in the left top corner. It is a small window that pops and disappears very fast, impossible to read what it says. Does anyone can help me with this? How do I find out what it is and even more important how can I delete/ remove it

Just in case we actually are confronted by a Trojan, read this:
From MacWorld, January 10, 2008:
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://www.securemac.com/
The DNSChanger Removal Tool detects and removes spyware targeting Mac OS X. Called DNSChanger Trojan and also known as OSX.RSPlug.A Trojan Horse the software attacks users attempting to play a fake video file.
Upon attempting to play the video, the victim receives the following message:
“Quicktime Player is unable to play movie file. Please click here to download new version of codec.”
Upon running the installer, the user's DNS records are modified, redirecting incoming internet traffic through the attacker's servers, where it can be hijacked and injected with malicious websites and pornographic advertisements. The trojan also installs a watchdog process that ensures the victim's DNS records stay modified on a minute-by-minute basis.
SecureMac's DNSChanger Removal Tool allows users to check to see if the trojan has been installed on their computer; if it has, the software helps to identify and remove the offending file. After a system reboot, the users' DNS records will be repaired.

New Trojan Horses

Last night, I made the mistake of downloading an app called "Wine" and "Winebottler". These are apps that allow Windows programs to be played on Macintosh without installing Windows. I ended up with 13 new OSX Trojan Horses on my Macintosh. These apps kept on installing add ons to the iTunes Store. I knew I was in trouble immediately, I guess, by instinct.I had also installed Wineskin for the same purpose, but I don't think that was the problem as I found no Trojan Horses associated with this app. I had my security set to download from App Store and Trusted Developers only. I am now going to upgrade my security to download from App Store only now, but I don't know for sure if that will help.
Luckily, I had Kaspersky on my Mac, and it kept on finding Trojan Horses on a full scan. I had firevault on and iCloud on. I am wondering now if my iCloud account is infected. I am currently erasing my whole hard drive and reinstalling. I will not turn on iCloud until I get some advice. For those that are unaware, I know we are in a cyberwar. I don't know where these apps originated, but I wanted the community to know this. I've used Macintosh since the first day it was available in 1984. I've never had troubles with viruses and Trojan Horses like this, except for two that were found by Kaspersky a couple of months ago and were easily found, isolated and disinfected. Not these. Most were easily disinfected: all but two. I had to restart the computer and Kaspersky got rid of them. Kaspersky is a great program, but I wasn't sure if it got rid of everything, which led me to erase and reinstall.
Please inform my about how secure iCloud is against attached viruses or should I delete my account.

etresoft wrote:
straycat23 wrote:
I downloaded from WineHQ.org.
I doubt that because WineHQ doesn't have any Mac versions of Wine available. They distribute Linux binaries and source. If you downloaded a Mac version, it must have come from somewhere else.
As soon as I downloaded it and the Winebottler, I knew I had problems.
Why?
I took your earlier advice: left OS10.9.1 in place and turned iCloud back on. I hope I made the right decision. I did not delete Kaspersky because OSX did not delete the Trojan or prevent it from being downloaded. Kaspersky did.
But you are in a catch-22 situation here. These forums are full of people reporting problems with computers and antivirus is a very common cause. By comparison, there are far fewer people reporting problems with trojans. Are these programs really trojans? And even if they are, would they cause as much trouble and be as difficult to remove as antivirus? I doubt it
As far as I can tell WineHQ must be a trusted developer, because that is how my computer is set as I previously stated.
I would definitely consider WineHQ to be trustworthy (more so than antivirus vendors) but they definitely do not have an Apple Developer ID that would enable them to distribute software past Gatekeeper. Someone malicious may have repackaged Wine, added trojans, and signed it with a Developer ID. The only way to address that problem is to identify where you got the software so that the illicit Developer ID can be revoked.
I did not download these programs to play games. That's for Millenials. I downloaded these because Windows is a disaster, and I didn't want to load Windows on my computer. There are Windows programs that there is no equivalent in Mac.
It doesn't matter why you downloaded them. If they are Windows programs, you are going to have to run Windows. Wine is a cool project, but very little software actually works on it.
I also deleted Adobe Flash Player as was advised in another thread. Now I can't see instructions in YouTube. Does the App Store have a recommended flash player to see You Tube?
Download Adobe Flash directly from Adobe and installer. Then download the Click2Flash Safari extension: http://hoyois.github.io/safariextensions/clicktoplugin/ so you can avoid Flash, if possible. If you ever get any Flash popup asking for an update, always close it - always. Then go to the Adobe Flash site yourself and see if there is an update and download it.
I downloaded the program from WineHQ. It's in my history. I went back and looked today. I don't think Linux has an iTunes version. I downloaded a program I didn't request that attached itself to iTunes. This is how I knew I had problems.
I appreciate all the advice: dismissive or not. It did give me confidence there's nothing wrong with my computer. I just don't have faith in Mac like I used to. I'm guessing that the trojans were not real, but I'm glad I had a device to delete the false positives, if for no other reason than it made me feel better. Any website can be attacked by hackers. Maybe that's what happened to WineHQ.

Need to revert to my old OS on iPad. Cannot. Tried using old backup but this Trojan horse type software has corrupted my ability to do so. Tried emailing but it bounced back unacknowledged. I was sent notice that I can't get support. Christmas 2012 gift.

New OS causing major problems. Forced to purge data and wipe iPad. Now my computer has changed. My software has changed on iPad. Tried using old backup from earlier date but Trojan horse software created by Apple has decided to stay.
Have 16gig. IPad 2 bought December 2012 for Christmas but according to Apple I am out of Apple care and would need to pay for support. When has 1 year apple care become 9 months?
Wasted an entire day trying to purge my older computer which is linked to this iPad. I reset my iPod and ended up deleting and wiping clean but it's not factory but the aggressive 7.2 which returned. I want my old OS back. Their software has destroyed my ability to use my iPad for the purposes I intended it for.
I don't do social media other than Pinterest and I want the fluffy stuff gone. They need to forget trying to get me into the clouds and fix this iPad so I can use it for real world applications.
You can only keep resetting so often. There has been hardware issues almost since purchase because it crashed several times even before updated fiasco.
Help please.

Ralph9430, thanks for responding but the fact that they don't support AppleCare on a unit less than a year old despite being an older version is wrong.
It suppose to be from date of purchase so their not taking responsibility for the maiming of people's computers and their subsequent arrogance in not removing it is going to their undoing.
We have purchased iPhones, Mac Pro, iPad, iPod touches in the nano, shuffle and touch versions in the past as well as the more solid 80gig version. I
I am still using 3G model phone and I can no longer find apps to use with it because Apple feels I don't deserve new apps.
My children are using iPhone 4 and my daughter was seeking to upgrade to the newest model when it becomes available. They are social, I am not and I deserve the software I paid for. It should always be an option.
I can tell you that this particular oversight is causing me to look elsewhere for future purchases and I will not be recommending Apple to others as I have in the past.

Flashplayer plug upgrade/install 11.6.602.180 failed because Trojan Horse

flashplayer plug upgrade/install 11.6.602.180 failed because Trojan Horse was detected by my antiviral software.
Please can you help?
Prof_ST

Hello Wojislav,
Thank you for your prompt response. Yes, I can do that but don't you think that it would be preferable if the installer/update script didn't evoke this response? None of my other software updates does and while I would like to trust people, these days it gets harder and harder when folks are willing to lie and cheat at the drop of a hat and without compunction. It does not help either that false sites (Adobe mimics) have been installing Trojan Horses so it would be safer all around to remove that foible. It is just not very good. Or at least, it does not look very good, which amounts to the same thing at first glance.
Thanks again for you concern.
Prof_ST
On Mon, 18 Mar 2013 00:06:45 +1000 Wojislav <[email protected]> wrote -
Re: flashplayer plug upgrade/install 11.6.602.180 failed because Trojan Horse
created by Wojislav in Installing Flash Player - View the full discussion Modify antivirus
Script for automatic updates some programs identify as a Trojan horse
you have to put in trusted sources adobe installer
or simply do the following: disable antivirus, install adobe, Switch on antivirus
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Suggested security upgrade did not install and left me with Trojan horses. Was it a spoof?

Yesterday evening (Oct. 4 2010) a pop up displaying the Firefox logo suggested a security upgrade for users of 3.6. It did not appear to install properly. There was also a box that suggested an associated update for (I think) Adobe, but there was no associated button. I shut down soon after. This morning, Oct.5, my computer brought up and I.E. window and an AVG threat message suggesting that it would forcibly remove a Trojan horse, but that it could cause a system lock. I did and it reported successful removal. My AVG scan is still running but it is reporting 7 Trojan horses and counting. KZUKEA (2868), Generic19.AKRT, VUNDA.LP,

It sounds like one of the rogue sites. They tell you that you are running an older version of Firefox and that Adobe Flash is out of date. They tell you to download a file called something like firefox-update.exe or ff-update.exe
That file contains a trojan.

Trojan Horse Virus

A little while ago, my macbook was very slow and I went into the Apple store and they recommended that I turn Norton Antivirus off. I did.
A few months later (now) I ran it just for the heck of it to see if it found anything - and it did. Two or three Trojan Horse malware files. Looking at Nortons descriptions, I think that they were (I located and deleted them) all PC based virus BUT, I am wondering:
1. I have Microsoft Office for Mac on my Macbook and I am wondering if those files might have been compromised by a PC virus?
2. I am assuming that if these files have been compromised there is nothing that I can do about retrieving that information as it could be anywhere.
3. If I have other PC based drives hooked up to my macbook wirelessly - were they vulnerable while I had these Trojan Horses on my Macbook?
Thanks.
A.

Don't always believe what Norton tells you. It is incompatible with OS X.
Norton Antivirus has a very long and illustrious reputation for mangling Mac OS X systems, sometimes to the point where a complete reinstall is necessary. Among other things, it installs kernel extensions which are known to cause kernel panics and system freezes; it contains known and documented bugs which can silently corrupt Adobe Photoshop and Adobe InDesign files, destroy a user's ability to authenticate as an administrator, and (on PPC systems) can cause Classic to stop functioning; and Symantec has on at least two occasions now released flawed .dat file updates which erroneously report certain critical Mac OS X files as "viruses." (Deleting these "viruses" causes damage to the system that in some cases renders it unbootable.)
1. No
2. Need more details about what you call 'compromised'
3. Yes.
No viruses that can attack OS X have so far been detected 'in the wild', i.e. in anything other than laboratory conditions.
It is possible, however, to pass on a Windows virus to another Windows user, for example through an email attachment. To prevent this all you need is the free anti-virus utility ClamXav, which you can download for Tiger and Leopard from (on no account install Norton Anti-Virus on a Mac running OS X):
http://www.clamxav.com/
The new version for Snow Leopard is available here:
http://www.clamxav.com/index.php?page=v2beta
(Note: ClamAV adds a new user group to your Mac. That makes it a little more difficult to remove than some apps. You’ll find an uninstaller link in ClamXav’s FAQ page online.)
If you are already using ClamXav: please ensure that you have installed Apple Security Update 2010-005 and that your version of ClamXav is the latest available.
However, the appearance of Trojans and other malware that can possibly infect a Mac seems to be growing, but is a completely different issue to viruses.
If you allow a Trojan to be installed, the user's DNS records can be modified, redirecting incoming internet traffic through the attacker's servers, where it can be hijacked and injected with malicious websites and pornographic advertisements. The trojan also installs a watchdog process that ensures the victim's (that's you!) DNS records stay modified on a minute-by-minute basis.
You can read more about how, for example, the OSX/DNSChanger Trojan works here:
http://www.f-secure.com/v-descs/trojanosxdnschanger.shtml
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://macscan.securemac.com/
The DNSChanger Removal Tool detects and removes spyware targeting Mac OS X and allows users to check to see if the trojan has been installed on their computer; if it has, the software helps to identify and remove the offending file. After a system reboot, the users' DNS records will be repaired.
(Note that a 30 day trial version of MacScan can be downloaded free of charge from:
http://macscan.securemac.com/buy/
and this can perform a complete scan of your entire hard disk. After 30 days free trial the cost is $29.99. The full version permits you to scan selected files and folders only, as well as the entire hard disk. It will detect (and delete if you ask it to) all 'tracker cookies' that switch you to web sites you did not want to go to.)
A white paper has recently been published on the subject of Trojans by SubRosaSoft, available here:
http://www.macforensicslab.com/ProductsAndServices/index.php?mainpage=document_general_info&cPath=11&productsid=174
Also, beware of MacSweeper:
MacSweeper is malware that misleads users by exaggerating reports about spyware, adware or viruses on their computer. It is the first known "rogue" application for the Mac OS X operating system. The software was discovered by F-Secure, a Finland based computer security software company on January 17, 2008
http://en.wikipedia.org/wiki/MacSweeper
On June 23, 2008 this news reached Mac users:
http://www.theregister.co.uk/2008/06/23/mac_trojan/
More on Trojans on the Mac here:
http://www.technewsworld.com/story/63574.html?welcome=1214487119
This was published on July 25, 2008:
Attack code that exploits flaws in the net's addressing system are starting to circulate online, say security experts.
The code could be a boon to phishing gangs who redirect web users to fake bank sites and steal login details.
In light of the news net firms are being urged to apply a fix for the loop-hole before attacks by hi-tech criminals become widespread.
Net security groups say there is anecdotal evidence that small scale attacks are already happening.
Further details here: http://news.bbc.co.uk/2/hi/technology/7525206.stm
A further development was the Koobface malware that can be picked up from Facebook (already a notorious site for malware, like many other 'social networking' sites like Twitter etc), as reported here on December 9, 2008:
http://news.bbc.co.uk/newsbeat/hi/technology/newsid_7773000/7773340.stm
You can keep up to date, particularly about malware present in some downloadable pirated software, at the Securemac site:
http://www.securemac.com/
There may be other ways of guarding against Trojans, viruses and general malware affecting the Mac, and alternatives will probably appear in the future. In the meantime the advice is: be careful where you go on the web and what you download!
If you think you may have acquired a Trojan, and you know its name, you can also locate it via the Terminal:
http://theappleblog.com/2009/04/24/mac-botnet-how-to-ensure-you-are-not-part-of- the-problem/
As to the recent 'Conficker furore' affecting Intel-powered computers, MacWorld recently had this to say:
http://www.macworld.co.uk/news/index.cfm?email&NewsID=25613
Although any content that you download has the possibility of containing malicious software, practising a bit of care will generally keep you free from the consequences of anything like the DNSChanger trojan.
1. Avoid going to suspect and untrusted Web sites, especially p'orn'ography sites.
2. Check out what you are downloading. Mac OS X asks you for you administrator password to install applications for a reason! Only download media and applications from well-known and trusted Web sites. If you think you may have downloaded suspicious files, read the installer packages and make sure they are legit. If you cannot determine if the program you downloaded is infected, do a quick Internet search and see if any other users reported issues after installing a particular program. A recent example is of malware distributed through innocent looking free screensavers: http://www.zdnet.com/blog/security/malware-watch-free-mac-os-x-screensavers-bund led-with-spyware/6560?tag=nl.e589
3. Use an antivirus program like ClamXav. If you are in the habit of downloading a lot of media and other files, it may be well worth your while to run those files through an AV application.
4. Use Mac OS X's built-in Firewalls and other security features.
5. Stop using LimeWire. LimeWire (and other peer-to-peer sharing applications and download torrents) are hotbeds of potential software issues waiting to happen to your Mac. Everything from changing permissions to downloading trojans and other malicious software can be acquired from using these applications. Similar risks apply to using Facebook, Twitter, MySpace, YouTube and similar sites which are prone to malicious hacking: http://news.bbc.co.uk/1/hi/technology/8420233.stm
6. Resist the temptation to download pirated software. After the release of iWork '09 earlier this year, a Trojan was discovered circulating in pirated copies of Apple's productivity suite of applications (as well as pirated copies of Adobe's Photoshop CS4). Security professionals now believe that the botnet (from iServices) has become active. Although the potential damage range is projected to be minimal, an estimated 20,000 copies of the Trojan have been downloaded. SecureMac offer a simple and free tool for the removal of the iBotNet Trojan available here:
http://macscan.securemac.com/files/iServicesTrojanRemovalTool.dmg
Also, there is the potential for having your entire email contact list stolen for use for spamming:
http://www.nytimes.com/2009/06/20/technology/internet/20shortcuts.html?_r=1
NOTE: Snow Leopard, OS 10.6.x, offers additional security to that of previous versions of OS X, but not to the extent that you should ignore the foregoing:
http://www.apple.com/macosx/security/
Apple's 10.6.4 operating system upgrade silently updated the malware protection built into Mac OS X to protect against a backdoor Trojan horse that can allow hackers to gain remote control over your treasured iMac or MacBook.
http://www.sophos.com/blogs/gc/g/2010/06/18/apple-secretly-updates
Finally, do not install Norton Anti-Virus on a Mac as it can seriously damage your operating system. Norton Anti-Virus is not compatible with Apple OS X.
And if you are using iPhone Apps you are also at risk of losing all privacy:
http://www.engadget.com/2010/10/03/hacker-claims-third-party-iphone-apps-can-tra nsmit-udid-pose-se/

Trojan Horse!

Every day for the past three days I have received on average 200 messages in "Mail" addressed to another gMail user. On each occasion there is a different users name. I have contacted these people and they have no idea what is going on. I posted a help message on the gMail discussion group and included some headers.
It appears that something is strange with the headers and Google have been asked to investigate. It has also been suggested that a Trojan Horse could be responsible and I should do some kind of virus check. I have just run ClamXav which detected nothing.
Can someone confirm if ClamXav would detect a Trojan Horse or is there something more suitable available?
Is anyone else having a similar problem, as I have noticed that, including myself and the other three gMail users, all of us use Mac.
Any help or suggestions would be greatly appreciated.

If you allow a Trojan to be installed, the user's DNS records can be modified, redirecting incoming internet traffic through the attacker's servers, where it can be hijacked and injected with malicious websites and pornographic advertisements. The trojan also installs a watchdog process that ensures the victim's (that's you!) DNS records stay modified on a minute-by-minute basis.
You can read more about how, for example, the OSX/DNSChanger Trojan works here:
http://www.f-secure.com/v-descs/trojanosxdnschanger.shtml
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://macscan.securemac.com/
The DNSChanger Removal Tool detects and removes spyware targeting Mac OS X and allows users to check to see if the trojan has been installed on their computer; if it has, the software helps to identify and remove the offending file. After a system reboot, the users' DNS records will be repaired.
(Note that a 30 day trial version of MacScan can be downloaded free of charge from:
http://macscan.securemac.com/buy/
and this can perform a complete scan of your entire hard disk. After 30 days free trial the cost is $29.99. The full version permits you to scan selected files and folders only, as well as the entire hard disk. It will detect (and delete if you ask it to) all 'tracker cookies' that switch you to web sites you did not want to go to.)

HT5246 The above info is confuses me. I thought this trojan horse affected those who had Java (JRE) up and running i.e.,Safari security Java checkbox enabled. I also believed this Trojan horse affected those using Snow Leopard. Clarify please.

The above info re the Flashback removal tool confuses me. I thought this trojan horse affected those who had Java (JRE) up and running i.e.,Safari security Java checkbox enabled. I also believed this Trojan horse also affected those using Snow Leopard. Clarify please.

There are several variants of the trojan. The first ones were released as installers for Adobe Flash and therefore did not require you to have Java on your system. Later variants took advantage of a Java vulnerability and could install themselves by simply visiting a rogue Web site. Therefore, even without Java installed if you had run a rogue updater for Adobe Flash or Reader, then you might have installed the trojan.
The trojan also affects Snow Leopard and prior versions of OS X (so far the code is known to be intel-only, but this is unconfirmed), but Apple has only issued patches for supported versions of the OS (version 10.6 or later).
Apple's removal tools run in OS X 10.6 or later if you instlal the Java update, and the standalone removal tool is for Lion only. Why Apple does not offer options for other operating systems is beyond me, but that's the way of things. Right now there are other tools you can use to check for and remove the malware on versions of OS X that Apple does not support: http://reviews.cnet.com/8301-13727_7-57413811-263/flashback-malware-removal-tool -roundup/

Trojan Horse Removal

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