Yahoo Password Stealer Infection – Remove infostealer pws-yahmali Virus

by on December 8th, 2009

McAfee detection center calls it pws-yahmali trojen and Symantec calls it infostealer.yahmali. It’s risk level is very low. And it’s only a password stealer. It attempts to steal the password of the yahoo messenger (whenever user logs in) and may send to ilam-mind-makers [dot] com.

System Infection

The Trojan may be downloaded or may arrive in spammed email as one of the following files:

%Temp%services.exe
%Temp%LSASS.EXE
%Temp%SMSS.EXE
%Temp%CSRSS.EXE
%Temp%WINLOGON.EXE

Once executed, the Trojan creates one of the following file:
%CurrentFolder%[RANDOM FILENAME]

It also creates and modifies some registry keys.

The Trojan specifically checks for Yahoo! Messenger with the following text in the window title:

Yahoo! Messenger with Voice

Remove pws-yahmali – Solution

Run a thorough system scan with any antivirus software. After scanning with an antivirus, follow the instructions below to remove pws-yahmali completely:
Disable System Restore.
Clean all the temporary files on the system. Use CCleaner to clean your system.
Delete the following registry keys:
Go to Start –> Run –> regedit and find the following key and delete these
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogon”shell” = “explorer.exe” C:DOCUME~1ADMINI~1LOCALS~1Temp[ORIGINAL TROJAN FILENAME].exe [RANDOM CHARACTERS]”
Run the following commands:
Go to Start –> Run and copy and paste the following commands one by one:
REG add HKCUsoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced /v HideFileExt /t REG_DWORD /d 1 /f
REG add HKCUsoftwareMicrosoftWindowsCurrentVersionExplorerAdvanced /v ShowSuperHidden /t REG_DWORD /d 0 /f

That’s it.
Stay Clean.

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