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Worm.Yimfoca

Posted: May 18, 2011

Threat Metric

Threat Level: 5/10
Infected PCs: 246
First Seen: March 17, 2011
OS(es) Affected: Windows

Worm.Yimfoca is a harmful computer worm that propagates through popular instant messaging programs and social networking websites, such as MSN Messenger, Skype, Yahoo! Messenger and AOL Instant Messenger. Worm.Yimfoca will connect to remote HTTP or IRC servers, which will allow it to receive updated configuration data. Worm.Yimfoca will also make modifications to specific security and system settings on the corrupted PC. Worm.Yimfoca will also try to stop Windows Automatic Updates and the Microsoft Antimalware service by running various commands on the computer system.

File System Modifications

  • The following files were created in the system:
    # File Name
    1 %windir%\nvsvc32.exe

Registry Modifications

  • The following newly produced Registry Values are:
    HKEY..\..\..\..{Subkeys}HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\

Aliases

Suspicion: unknown virus [AVG]W32/VB.AFVG!tr [Fortinet]Trojan.Win32.VB [Ikarus]TR/Agent.98304.O [AntiVir]Trojan-Downloader.Win32.VB.afvg [Kaspersky]Win32:VB-RCT [Trj] [Avast]W32/Yahos.R [F-Prot]W32/IRCbot.gen.a [McAfee]Dropper.Generic3.AKIR [AVG]W32/YIMFOCA.AA!worm [Fortinet]Win-Trojan/Seint.157184 [AhnLab-V3]Trojan/Win32.PornoBlocker.gen [Antiy-AVL]Worm/Yimfoca.C [AntiVir]Trojan.DownLoader2.23431 [DrWeb]Troj/Buzus-FZ [Sophos]
More aliases (365)

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



%WINDIR%\SysWOW64\config\systemprofile\AppData\Local\Windows Internet Name Service\wins.exe File name: wins.exe
Size: 4.84 MB (4849152 bytes)
MD5: 1c2fdee5074f0c45f0e63dc99e6bf26c
Detection count: 16
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%\SysWOW64\config\systemprofile\AppData\Local\Windows Internet Name Service
Group: Malware file
Last Updated: March 18, 2011
%WINDIR%\csrss.exe File name: csrss.exe
Size: 102.4 KB (102400 bytes)
MD5: 9691269318725bd23dd1b805b69ef6a7
Detection count: 12
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%
Group: Malware file
Last Updated: September 5, 2011
%WINDIR%\system32\repsvc.exe File name: repsvc.exe
Size: 172.03 KB (172032 bytes)
MD5: 0fb55d6c5b841265938a274a15c9be81
Detection count: 7
File type: Executable File
Mime Type: unknown/exe
Path: %WINDIR%\system32
Group: Malware file
Last Updated: May 3, 2011
%PUBLIC%\nvsvc32.exe File name: nvsvc32.exe
Size: 98.3 KB (98304 bytes)
MD5: 469c894ae9f8265bb67c747d7031583c
Detection count: 5
File type: Executable File
Mime Type: unknown/exe
Path: %PUBLIC%
Group: Malware file
Last Updated: February 22, 2013
%USERPROFILE%\Mes documents\downloads\facebook-pic00320123561 (4).exe File name: facebook-pic00320123561 (4).exe
Size: 157.18 KB (157184 bytes)
MD5: 32834222b0ad33984c3968d526759d69
Detection count: 3
File type: Executable File
Mime Type: unknown/exe
Path: %USERPROFILE%\Mes documents\downloads
Group: Malware file
Last Updated: September 29, 2011

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