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Virus:TR/Kryptik.OY
Date discovered:13/07/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:143.872 Bytes
MD5 checksum:234656F9F8D901A8AA32BB057BEA87FA
VDF version:7.11.11.125 - Wednesday, July 13, 2011
IVDF version:7.11.11.125 - Wednesday, July 13, 2011

 General Aliases:
   •  TrendMicro: TROJ_SPNR.0BGL11
   •  Sophos: Mal/Zbot-DE
   •  Microsoft: TrojanSpy:Win32/Ranbyus.G


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:
   • %SYSDIR%\windebug32.exe



It deletes the initially executed copy of itself.

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\
   Run]
   • "Windows Debugger 32"="%SYSDIR%\windebug32.exe"



It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%SYSDIR%\svchost.exe"="%SYSDIR%\svchost.exe:*:Enabled:Windows
      Debugger 32"

 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 the following runtime packer:
   • UPX

Description inserted by Andrei Ilie on Tuesday, October 25, 2011
Description updated by Andrei Ilie on Wednesday, October 26, 2011

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