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Most of my EXE's have been infected by undetectable rootkit.

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5 replies to this topic

#1 ihaterootkits


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Posted 10 June 2009 - 10:36 PM

After i got infected somehow by this virus called Win32.Agent.ACMH, and some other trojan who's name i cant remember, i spent all of yesterday cleaning it up with at least 3 Avast boot scans. Finally gained back control of my computer and reconfirmed with HijackThis to make sure everything's back to normal. But when i tried to open a movie file, which because i have k-lite installed it automatically uses WMP Classic, my Avast goes off and warns me i have a malicious rootkit by the name of svchost[1].exe(and bunch of random letters and numbers) in the Temporary Internet Files/IEContent5/randomletters etc.

So, it looks like the virus/trojan had left a legacy behind, by infecting almost all of my exe files with this malicious set of instructions that makes it connect to the internet, download a rootkit into the Temporary Internet Files, which then automatically executes itself. I know this because I finally got around to installing a firewall (Online Armor from A Squared) and it's warning me that so and so program is trying to connect to the internet. Some programs, like Paint Shop Pro, can still run normally after i block it from accessing the internet. Uninstallers no longer work because they're "corrupted" (probably modified by the virus). Fortunately, most Windows apps like IE, explorer, and accessories like Notepad and Calculator don't seem to have been affected. Microsoft Office, and lots of other small apps that i have lying around have bitten the dust.

So has anyone ever heard of such a rootkit? How can all those infected exe's bypass my Avast full system scan + 3 boot scans? The boot scans detected and deleted some dll's in the Windows directory, but it cannot pick up the exe's. I am pretty sure the virus itself or any other malicious programs are not present in this computer, because I took one of the exe's which i know was infected to another clean computer. Scanned the file, it's clean. Tried to run it.... and it downloads the rootkit again and tries to run it (fortunately the anti-virus stops it). So it's definitely the files, and not my Windows. That's why i haven't even bothered to reinstall Windows. Everything seems to be fine right now, but i'll have to manually test and delete almost every single program in my hard drive. Some that cannot be uninstalled, I'll either have to re-install the program from CD, or re-download the program and then uninstall it again.

Here is one of the infected exe's, i've uploaded it for anyone who is interested in taking a look for me. I am currently installing/updating A Squared's free anti-virus, after hearing some good opinions about it, i'll see if it can detect and hopefully repair my exe's from the infection. Below is an infected EXE file, do not download unless you have anti-virus programs to protect yourself! It is for analytical purposes only!

Edited by Pandy, 10 June 2009 - 11:18 PM.
malicious link removed ~Pandy

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#2 ihaterootkits

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Posted 10 June 2009 - 10:40 PM

I just remembered the wonderful website that is Virustotal. I uploaded the above file, and only 11 out of 39 programs detected the infection! Avast and A-Squared did not notice anything at all. That's it then, time to change AV.

Currently deciding between Kapersky, NOD32 (heard great things about it), or AVG. All three of these detected it.

Scan results: http://www.virustotal.com/analisis/ef70da6...7a05-1244691527

Edited by ihaterootkits, 10 June 2009 - 10:48 PM.

#3 boopme


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Posted 10 June 2009 - 11:54 PM

Hello, please run these and post back a log.

PLease run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware and save it to your desktop.
alternate download link 1
alternate download link 2

MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
  • If an update is found, the program will automatically update itself. Press the OK button to close that box and continue.
  • If you encounter any problems while downloading the definition updates, manually download them from here and just double-click on mbam-rules.exe to install.
On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.

Next run ATF and SAS:
From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
DO NOT run yet.
Open SUPER from icon and install and Update it
Under Scanner Options make sure the following are checked (leave all others unchecked):
Close browsers before scanning.
Scan for tracking cookies.
Terminate memory threats before quarantining
Click the "Close" button to leave the control center screen and exit the program. DO NOT run yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
If asked if you want to reboot, click "Yes" and reboot normally.

To retrieve the removal information after reboot, launch SUPERAntispyware again.
Click Preferences, then click the Statistics/Logs tab.
Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
If there are several logs, click the current dated log and press View log.
A text file will open in your default text editor.
Please copy and paste the Scan Log results in your next reply.
Click Close to exit the program.
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#4 ihaterootkits

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Posted 11 June 2009 - 12:13 AM

I just used ESET to scan and delete all the infected exe's, turns out only a portion were infected. I will try MBAM in just a moment, but i would like to ask a question about rootkits. I read the article where it explained that rootkits can enable a hacker to mask the process from the task manager entirely. Can rootkits hide malicious programs or code from HijackThis logs?

#5 boopme


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Posted 11 June 2009 - 11:44 AM

Hello,I belive in some cases a kernel bsaed rootkit can hode ..

Kernel-mode rootkits can be even more powerful since, not only can they intercept the native API in kernel-mode, but they can also directly manipulate kernel-mode data structures. A common technique for hiding the presence of a malware process is to remove the process from the kernel's list of active processes.

The rootkit itself does typically not cause deliberate damage. Its purpose is to hide software. But rootkits are used to hide malicious code. A virus, worm, backdoor or spyware program could remain active and undetected in a system for a long time if it uses a rootkit.

The malware may remain undetected even if the computer is protected with state-of-the-art antivirus. And the antivirus can't remove something that it can't see. The threat from modern malware combined with rootkits is very similar to full stealth viruses that caused a lot of headache during the MS-DOS era.


How is it running now.. The experts in the HJT/DDS will be able to find any that are hiden ther if you want to go there.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#6 Orange Blossom

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Posted 16 June 2009 - 01:35 PM


Now that you have posted a log here: http://www.bleepingcomputer.com/forums/t/233139/cleaned-system-check-log-please-and-question-about-rootkits/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond. Please be patient. It may take a while to get a response but your log will be reviewed and answered as soon as possible

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom :thumbsup:
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