Virus:DR/Xbot.L
Date discovered:04/08/2006
Type:Dropper
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:20.384 Bytes
MD5 checksum:2188b1bc1342c0824c2f5429678a310C
VDF version:6.35.01.46 - Friday, August 4, 2006
IVDF version:6.35.01.46 - Friday, August 4, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  TrendMicro: BKDR_AGENT.DFT
   •  Bitdefender: Dropped:Backdoor.Xbot.L


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops a malicious file
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\remote.exe



It deletes the initially executed copy of itself.



The following file is created:

– %SYSDIR%\kernel32.ime Furthermore it gets executed after it was fully created. Detected as: BDS/Xbot.L

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\RpcRemote]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000001
   • "ImagePath"="%SYSDIR%\remote.exe"
   • "DisplayName"="Remote Procedure Call (RPC) Remote"
   • "ObjectName"="LocalSystem"
   • "Description"="Manages the RPC name service database."

– [HKLM\SYSTEM\CurrentControlSet\Services\RpcRemote\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\RpcRemote\Enum]
   • "0"="Root\\LEGACY_RPCREMOTE\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

 Injection –  It injects the following file into a process: KERNEL32.IME

    Process name:
   • SVCHOST.EXE


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • WinUpack

Description inserted by Gabriel Mustata on Friday, August 11, 2006
Description updated by Gabriel Mustata on Monday, August 28, 2006

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