Virus:TR/Drop.Bomka.G.2
Date discovered:09/02/2006
Type:Trojan
Subtype:Dropper
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:185.953 Bytes
MD5 checksum:141dd10Ecaaffae90828993c1f2aab70
VDF version:6.33.00.212

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: AdClicker-DW
   •  TrendMicro: TROJ_BOMKA.G
   •  Sophos: Troj/Bombka-F
   •  Panda: Trj/Dropper.QN
   •  Bitdefender: Trojan.Downloader.Bomka.G


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


Side effects:
   • Drops files
   • Drops a malicious file
   • Registry modification
   • Steals information

 Files The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • %TEMPDIR%\ns%random character string%.tmp

– %SYSDIR%\kaboom.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Bomka.G

– %TEMPDIR%\game1.exe Furthermore it gets executed after it was fully created.

 Registry It registers a browser helper object (BHO) by adding the following keys:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\
   Browser Helper Objects\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}]
– [HKCR\Horde.Labspak]
   • @="Labspak"

– [HKCR\Horde.Labspak\CLSID]
   • @="{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}"

– [HKCR\Horde.Labspak\CurVer]
   • @="Horde.Labspak.1"

– [HKCR\Horde.Labspak.1]
   • @="Labspak"

– [HKCR\Horde.Labspak.1\CLSID]
   • @="{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}"

– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}]
   • @="Labspak"

– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}\InprocServer32]
   • @="%SYSDIR%\kaboom.dll"
   • "ThreadingModel"="Apartment"

– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}\ProgID]
   • @="Horde.Labspak.1"

– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}\Programmable]
– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}\TypeLib]
   • @="{90EC7761-4998-4536-B4D7-9EB72ADB3042}"

– [HKCR\CLSID\{FAFC3FDD-D9E8-4770-843D-F105F0D7E409}\
   VersionIndependentProgID]
   • @="Horde.Labspak"

– [HKCR\TypeLib\{90EC7761-4998-4536-B4D7-9EB72ADB3042}\3.0]
   • @="KABOOMLib"

– [HKCR\TypeLib\{90EC7761-4998-4536-B4D7-9EB72ADB3042}\3.0\0\win32]
   • @="%SYSDIR%\kaboom.dll"

– [HKCR\TypeLib\{90EC7761-4998-4536-B4D7-9EB72ADB3042}\3.0\FLAGS]
   • @="0"

– [HKCR\TypeLib\{90EC7761-4998-4536-B4D7-9EB72ADB3042}\3.0\HELPDIR]
   • @="%SYSDIR%\"



The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Zeal]
   • "campaign_id"="18"
   • "is_dialup"=dword:%hex number%
   • "user_id"="%six-digit random character string%"
   • "sleep_delay"=dword:%hex number%
   • "install_delay"=dword:%hex number%
   • "main_delay"=dword:%hex number%
   • "stage"=dword:%hex number%
   • "timeout"=dword:%hex number%

– [HKCR\Interface\{9F111438-8C25-4BEB-A9F6-841FD4728B22}]
   • @="ILabspak"

– [HKCR\Interface\{9F111438-8C25-4BEB-A9F6-841FD4728B22}\
   ProxyStubClsid]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKCR\Interface\{9F111438-8C25-4BEB-A9F6-841FD4728B22}\
   ProxyStubClsid32]
   • @="{00020424-0000-0000-C000-000000000046}"

– [HKCR\Interface\{9F111438-8C25-4BEB-A9F6-841FD4728B22}\TypeLib]
   • @="{90EC7761-4998-4536-B4D7-9EB72ADB3042}"
   • "Version"="3.0"

 Backdoor Contact server:
One of the following:
   • joywebserfer.com/counter11/**********
   • cleverhead.info/counter11/**********
   • wannabcool.info/counter11/**********
   • somethngcool.info/counter11/**********
   • sortbycool.info/counter11/**********
   • mucho-cool.com/counter11/**********
   • epromosystems.com/counter11/**********

The following:
   • mucho-cool.com/counter11/**********

As a result it may send information and remote control could be provided. This is done via the HTTP GET request on a PHP script.
The servers answer is written to the file: %TEMPDIR%\s32o.%random number%


Sends information about:
    • Computer name
    • Current user
    • Internet connection type
    • Platform ID


Remote control capabilities:
    • Visit a website

 Injection –  It injects the following file into a process: kaboom.dll

    Process name:
   • iexplore.exe


 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 Daniel Constantin on Tuesday, February 14, 2006
Description updated by Daniel Constantin on Tuesday, February 14, 2006

Back . . . .