TR/Drop.Bomka.G.2 - Trojan

See also

Summary

Full description

Statistics

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 - Thu, 09 Feb 2006 07:20 (GMT+1)

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

See a brief description here.

Description inserted by Daniel Constantin on Tue, 14 Feb 2006 09:21 (GMT+1)
Description updated by Daniel Constantin on Tue, 14 Feb 2006 09:37 (GMT+1)

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