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Backdoor/Trojan infection?


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#1 darthskeptic

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Posted 23 June 2009 - 08:13 PM

Got hit with something today. MBAM and SAS cleaned up most of it but little things like the default sound options and volume display have suddenly changed. I also had to reset the wireless on my laptop to have windows configure it Log files are:

Malwarebytes' Anti-Malware 1.38
Database version: 2326
Windows 5.1.2600 Service Pack 3

6/23/2009 6:31:54 PM
mbam-log-2009-06-23 (18-31-54).txt

Scan type: Full Scan (C:\|)
Objects scanned: 175147
Time elapsed: 1 hour(s), 22 minute(s), 20 second(s)

Memory Processes Infected: 1
Memory Modules Infected: 0
Registry Keys Infected: 2
Registry Values Infected: 2
Registry Data Items Infected: 2
Folders Infected: 1
Files Infected: 6

Memory Processes Infected:
C:\WINDOWS\system32\f.exe (Backdoor.Bot) -> Unloaded process successfully.

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.
HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\{43bf8cd1-c5d5-2230-7bb2-98f22c2b7dc6} (Backdoor.Bot) -> Quarantined and deleted successfully.

Registry Values Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\UID (Malware.Trace) -> Delete on reboot.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\defender32.exe (Trojan.Downloader) -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.FakeAlert) -> Data: c:\windows\system32\sdra64.exe -> Delete on reboot.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Hijack.Userinit) -> Bad: (C:\WINDOWS\system32\userinit.exe,C:\WINDOWS\system32\sdra64.exe,) Good: (Userinit.exe) -> Quarantined and deleted successfully.

Folders Infected:
C:\WINDOWS\system32\lowsec (Stolen.data) -> Delete on reboot.

Files Infected:
C:\WINDOWS\system32\lowsec\local.ds (Stolen.data) -> Delete on reboot.
C:\WINDOWS\system32\lowsec\user.ds (Stolen.data) -> Delete on reboot.
C:\WINDOWS\system32\lowsec\user.ds.lll (Stolen.data) -> Quarantined and deleted successfully.
C:\WINDOWS\system32\f.exe (Backdoor.Bot) -> Delete on reboot.
C:\WINDOWS\system32\sdra64.exe (Trojan.FakeAlert) -> Delete on reboot.
C:\Documents and Settings\Zachary Ullman\Local Settings\Temp\defender32.exe (Trojan.Downloader) -> Quarantined and deleted successfully.

and


SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 06/23/2009 at 08:38 PM

Application Version : 4.26.1000

Core Rules Database Version : 3952
Trace Rules Database Version: 1894

Scan type : Complete Scan
Total Scan Time : 01:44:03

Memory items scanned : 630
Memory threats detected : 0
Registry items scanned : 6419
Registry threats detected : 0
File items scanned : 85686
File threats detected : 9

Adware.Tracking Cookie
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@ad.yieldmanager[1].txt
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@a1.interclick[1].txt
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@doubleclick[1].txt
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@interclick[1].txt
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@msnbc.112.2o7[1].txt
C:\Documents and Settings\Zachary Ullman\Cookies\zachary_ullman@z.blogads[1].txt

Trojan.Agent/Gen-FraudDrop
C:\DOCUMENTS AND SETTINGS\ALL USERS\APPLICATION DATA\NORTON\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\NORTON\BASH\CLONE\BHC39C.TMP
C:\DOCUMENTS AND SETTINGS\ALL USERS\APPLICATION DATA\NORTON\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\NORTON\BASH\CLONE\BHC39D.TMP
C:\DOCUMENTS AND SETTINGS\ALL USERS\APPLICATION DATA\NORTON\{0C55C096-0F1D-4F28-AAA2-85EF591126E7}\NORTON\BASH\CLONE\BHC39E.TMP

Do I need to run anything else to clean this up?

Edited by darthskeptic, 23 June 2009 - 08:21 PM.


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#2 boopme

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Posted 23 June 2009 - 08:26 PM

Hi, just some advice first.
A backdoor Trojan can allow an attacker to
gain control of the system, log keystrokes, steal passwords, access personal
data, send malevolent outgoing traffic, and close the security warning
messages displayed by some anti-virus and security programs.

I would advise you to disconnect this PC from the Internet, and then go to
a known clean computer and change any passwords or security information held
on the infected computer. In particular, check whatever relates to online
banking financial transactions, shopping, credit cards, or sensitive
personal information. It is also wise to contact your financial institutions
to apprise them of your situation.



Rerun MBAM like this:

Open MBAM in normal mode and click Update tab, select Check for Updates,when done
click Scanner tab,select Quick scan and scan.
After scan click Remove Selected, Post new scan log and Reboot into normal mode.
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#3 darthskeptic

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Posted 23 June 2009 - 08:53 PM

Nothing new found

Malwarebytes' Anti-Malware 1.38
Database version: 2327
Windows 5.1.2600 Service Pack 3

6/23/2009 9:52:36 PM
mbam-log-2009-06-23 (21-52-36).txt

Scan type: Quick Scan
Objects scanned: 112128
Time elapsed: 17 minute(s), 31 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

#4 boopme

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Posted 23 June 2009 - 08:58 PM

Hi, OK we look good now. Update and scan every week and keep an eye out for that Backdoor.Bot. If you see it again . A format will be the only solution.

Now you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista Users can refer to these links: Create a New Restore Point and Disk Cleanup.
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

#5 darthskeptic

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Posted 23 June 2009 - 09:10 PM

Done. Lack of clicking noises and some other effects (no sound when recieving a message on AIM but the sound from sending one remains) is still odd.

#6 boopme

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Posted 23 June 2009 - 10:19 PM

Probably fixed by reinstalling AIM.

Please take a moment to read quietman7's excellent prevention tips in post 17 here
Click>>Tips to protect yourself against malware and reduce the potential for re-infection:
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




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