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Virus:BDS/IRCBot.EW.16
Date discovered:18/05/2011
Type:Backdoor Server
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:83.456 Bytes
MD5 checksum:d9b45ea0b23efa5acf702f10992c0ecb
VDF version:7.11.08.60 - Wednesday, May 18, 2011
IVDF version:7.11.08.60 - Wednesday, May 18, 2011

 General Aliases:
   •  Kaspersky: Backdoor.Win32.Rosex.k
   •  F-Secure: Backdoor.Win32.Rosex.k
   •  Bitdefender: Trojan.Generic.KDV.138188
   •  GData: Trojan.Generic.KDV.138188
   •  DrWeb: Trojan.DownLoader2.12743


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


Side effects:
   • Third party control
   • Drops malicious files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following location:
   • %HOME%\Application Data\Microsoft\exploiter.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft Windows Hosting Service Login"="%HOME%\Application Data\Microsoft\exploiter.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft Windows Hosting Service Login"="%HOME%\Application Data\Microsoft\exploiter.exe"



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

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "Microsoft Windows Hosting Service Login"="%HOME%\Application
      Data\Microsoft\exploiter.exe"

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: gangbang.low**********.org
Port: 25343
Channel: #!zer0
Nickname: [USA|XP|%random character string%]

 Miscellaneous Mutex:
It creates the following Mutex:
   • 6jtgkfgjuhiggggkjkfh

 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 Petre Galan on Friday, June 3, 2011
Description updated by Andrei Ivanes on Friday, June 10, 2011

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