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RootKit: IAT Modification


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4 replies to this topic

#1 WeidlerG

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Posted 13 September 2010 - 08:19 AM

Likely Rootkit doing IAT modification. After a clean CD install to Win XP SP1. Then SP2 and 3 from a CD burned by an
uneffected PC.
It started while browsing - using Google search. McAfee reported a Trojan.
But it did not stop it. Redirected sites, false AV scans. It slowly strangled the machine.
The USB drive attached to it was moved to a second PC, and infected it as well.
I charged my Razr phone using an infected PC and then moved it to a second laptop to charge,
the third PC got infected.
The worst symtoms (web redirection, disabling hardware, blocking anit-malware sites)
disappeared after a format and reinstall from the recovery partition.
I have scanned using almost every tool available. MRT reported it as Alureon.
I formated the C: drive and did more than one install from the recovery partition.
The mild symtoms reappeared almost immediately.
The mild systoms are:
Hidden and System "desktop.ini" files created frequently in Documents and Setting folders.
Delete them and they reaapear. Same with Index.dat files in D&S folders. Iconcache appears in
one D&S folder as does GDIFonts.dat. It also appears to modify Explorer to not show all files: GMER
shows a + next to folder. When you get to it, it is empty and the + disappears.
Regedit is unable to see settings that GMER reports in Red.
"Users" have been added to the registry, begining with S-1-5-.
And Windows/Prefetch shows a lot of exectuables (through the ".EXE") that do not appear anywhere on the drive.
Gmer MBR reports clean. MRT is clean, as is RootKit Repealer, Gmer (other than Registry entries, that I cannot see using Regedit).
DrWeb (both AV and CureIt), AVG Rootkit, MBAM, and a few more. But, I do not trust these much if the rootkit can hide from them.
After the Gmer registry problems that cannot be seen in Regiedit, the only tool that reports a possible problem is
Rootkit Unhooker:

Rootkit Unhooker reports possible IAT modifcation as follows:
==============================================
>Stealth
==============================================
>Files
==============================================
>Hooks

[ntkrnlpa.exe+0x0006EC6E, Type: Inline - RelativeJump 0x80545C6E [ntkrnlpa.exe]
[2036]explorer.exe-->advapi32.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x77DD1218 [shimeng.dll]
[2036]explorer.exe-->gdi32.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x77F110B4 [shimeng.dll]
[2036]explorer.exe-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x01001268 [shimeng.dll]
[2036]explorer.exe-->shell32.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x7C9C15A4 [shimeng.dll]
[2036]explorer.exe-->user32.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x7E41133C [shimeng.dll]
[2036]explorer.exe-->wininet.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x771B124C [shimeng.dll]
[2036]explorer.exe-->ws2_32.dll-->kernel32.dll-->GetProcAddress, Type: IAT modification 0x71AB109C [shimeng.dll][/b]

I have exhausted my humble abilities and considerable patience.
Any help is greatly appreciated.


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#2 Shannon2012

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Posted 20 September 2010 - 01:58 PM

Hello and welcome to Bleeping Computer

We apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.

If you have since resolved the original problem you were having, we would appreciate you letting us know. If not please perform the following steps below so we can have a look at the current condition of your machine.

If you have not done so, include a clear description of the problems you're having, along with any steps you may have performed so far.

Upon completing the steps below another staff member will review and take the steps necessary with you to get your machine back in working order clean and free of malware.

If you have already posted a DDS log, please do so again, as your situation may have changed.
Use the 'Add Reply' and add the new log to this thread.

Thanks and again sorry for the delay.

We need to see some information about what is happening in your machine. Please perform the following scan:
  • Download DDS by sUBs from one of the following links. Save it to your desktop.
  • Double click on the DDS icon, allow it to run.
  • A small box will open, with an explaination about the tool. No input is needed, the scan is running.
  • Notepad will open with the results.
  • Follow the instructions that pop up for posting the results.
  • Close the program window, and delete the program from your desktop.
Please note: You may have to disable any script protection running if the scan fails to run. After downloading the tool, disconnect from the internet and disable all antivirus protection. Run the scan, enable your A/V and reconnect to the internet.

Information on A/V control HERE

We also need a new log from the GMER anti-rootkit scanner. Please first disable any CD emulation programs using the steps found in this topic:

Why we request you disable CD Emulation when receiving Malware Removal Advice

Then create another GMER log and post it as an attachment to the reply where you post your new DDS log. Instructions on how to properly create a GMER log can be found here:

How to create a GMER log


Shannon

#3 WeidlerG

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Posted 21 September 2010 - 12:51 AM

Here are the logs from DDS and Gmer. All were run in Safe mode.
If they should be run in Normal mode, let me know and I will rerun.
All three PCs remain mostly crippled.

Attached Files


Edited by WeidlerG, 21 September 2010 - 12:53 AM.


#4 sempai

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Posted 23 September 2010 - 01:16 AM

Hello and welcome to Bleeping Computer. smile.gif

*Please Subscribe to this Thread to get immediate notification of replies. See HERE

*It is important not to make any further changes or run any other tools/updates unless instructed to. This may hinder the cleaning process of your machine.

*Please be patient, all Bleeping Computer helpers are volunteers and have lives outside this forum.

*You must reply within 5 days otherwise this topic will be closed.



================================================


Did you previously run Combofix? If yes, please post the contents of C:\combofix.txt.

Edited by sempai, 23 September 2010 - 01:17 AM.

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#5 sempai

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Posted 28 September 2010 - 07:37 AM

Due to lack of feedback, this topic has been closed.

If you need this topic reopened, please contact a staff member. This applies only to the original topic starter. Everyone else please begin a New Topic.

~Semp

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You can help me continue the fight against malware by making a donation, Thank you.

If I am helping you and I didn't reply within 48 hours... Please send me a private message.
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