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Virus:WORM/Ainslot.A.1042
Date discovered:13/06/2011
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
File size:227.328 Bytes
MD5 checksum:6F171DBAC99D8853115BD7505360FE79
VDF version:7.11.09.166 - Monday, June 13, 2011
IVDF version:7.11.09.166 - Monday, June 13, 2011

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Infostealer
   •  Mcafee: Ainslot.b
   •  Kaspersky: Trojan.Win32.Jorik.Shakblades.xy
   •  TrendMicro: WORM_JORIK.IW
     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 locations:
   • %WINDIR%\Directory\dllhost.exe
   • %APPDATA%\dllhost.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]
   • "dllhost"="%WINDIR%\Directory\dllhost.exe"

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   Run]
   • "dllhost"="%WINDIR%\Directory\dllhost.exe"

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

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

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



The following registry keys are added:

[HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {1BF4D6BD-B632-BAE4-28CC-0AEA5205A7BF}]
   • "StubPath"="%APPDATA%\dllhost.exe"

[HKCU\Software\Microsoft\Active Setup\Installed Components\
   {1BF4D6BD-B632-BAE4-28CC-0AEA5205A7BF}]
   • "StubPath"="%APPDATA%\dllhost.exe"

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

    Process name:
   • explorer.exe


 Miscellaneous Accesses internet resources:
   • charlatan.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.

설명 삽입자 Andrei Ilie   2011년 7월 27일 수요일
설명 업데이트 Andrei Ilie   2011년 7월 28일 목요일

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