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Date discovered:27/04/2011
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:184.320 Bytes
MD5 checksum:41e44019e81682c991ccc9fdd62f99dd
VDF version:
IVDF version:

 General Aliases:
   •  Kaspersky: Backdoor.Win32.Gbot.doa
   •  Bitdefender: Trojan.Downloader.JOIC
   •  GData: Trojan.Downloader.JOIC
   •  DrWeb: Trojan.DownLoader2.39705

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

Side effects:
   • Drops malicious files
   • Registry modification
   • Makes use of software vulnerability
      •  CVE-2007-1204
      •  MS07-019

 Files It copies itself to the following location:
   • %TEMPDIR%\csrss.exe

The following file is created:

– %HOME%\Application Data\01E2.543

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

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   • "EnableFirewall"=dword:0x00000000

The following registry key is changed:

– [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows]
   New value:
   • "Load"="%TEMPDIR%\csrss.exe"

 Miscellaneous  Checks for an internet connection by contacting the following web site:
Accesses internet resources:
   •**********?v18=%number%&tq=%character string%
   •**********?v45=%number%&tq=%character string%
   •**********?tq=%character string%
   •**********?v95=%number%&tq=%character string%

It creates the following Mutexes:
   • {B37C48AF-B05C-4520-8B38-2FE181D5DC78}
   • {5D92BB9F-9A66-458f-ACA4-66172A7016D4}
   • {4D92BB9F-9A66-458f-ACA4-66172A7016D4}
   • {61B98B86-5F44-42b3-BCA1-33904B067B81}
   • {B16C7E24-B3B8-4962-BF5E-4B33FD2DFE78}

 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 Monday, July 4, 2011
Description updated by Petre Galan on Monday, July 4, 2011

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