Full description

Virus:	WORM/Ainslot.A.1037
Date discovered:	13/06/2011
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
File size:	228.435 Bytes
MD5 checksum:	1FC2553E16E1F9599AF24E4F1AEE8CF1
VDF version:	7.11.09.164 - Monday, June 13, 2011
IVDF version:	7.11.09.164 - Monday, June 13, 2011

General Method of propagation:
   • No own spreading routine

Aliases:
   • Mcafee: Ainslot.b
   • Kaspersky: Trojan.Win32.Jorik.Shakblades.rv
   • TrendMicro: TROJ_JORIK.WRF
   • Sophos: Mal/Ainslot-B
   • Microsoft: Worm:Win32/Ainslot.A

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7

Side effects:
   • Drops files
   • Registry modification

Files It copies itself to the following location:
• %APPDATA%\svchost.exe

The following file is created:

– %APPDATA%\data.dat Contains parameters used by the malware.

Registry To each registry key one of the values is added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "svchost"="%APPDATA%\svchost.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "svchost"="%APPDATA%\svchost.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   run]
   • "svchost"="%APPDATA%\svchost.exe"

The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {BFC191A4-B8A2-DD91-DFA0-BBF8AC208669}]
   • "StubPath"="%APPDATA%\svchost.exe"

– [HKCU\Software\Microsoft\Active Setup\Installed Components\
   {BFC191A4-B8A2-DD91-DFA0-BBF8AC208669}]
   • "StubPath"="%APPDATA%\svchost.exe"

Injection – It injects itself as a remote thread into a process.

Process name:
• explorer.exe

Miscellaneous Accesses internet resources:
• blackxpazit.no-ip.biz

File details Programming language:
The malware program was written in MS Visual C++.

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Ilie on woensdag 27 juli 2011
Description updated by Andrei Ilie on woensdag 27 juli 2011

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