TROJ_BHO.SMUM5
TrojanDownloader:Win32/Adload.CF (Microsoft); Downloader.a!cx (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Darbyen.A (v) (not malicious) (Sunbelt); Gen:Variant.Zusy.10344 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
282,624 bytes
EXE
Yes
21 Jul 2012
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan creates the following folders:
- %Program Files%\Microsoft
- %Program Files%\gameversionupdate1
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
GameVersionUpdate1 = "%Program Files%\gameversionupdate1\GameUpdate1.exe"
Other System Modifications
This Trojan deletes the following files:
- %System Root%\3547e1f287.exe
- %System Root%\3547e1f2871.exe
- %System Root%\3547e1f2872.exe
- %System Root%\3547e1f2873.exe
- %System Root%\3547e1f2874.exe
- %System Root%\3547e1f2875.exe
- %System Root%\3547e1f2876.exe
- %System Root%\3547e1f2877.exe
- %System Root%\3547e1f2878.exe
- %System Root%\3547e1f2879.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Dropping Routine
This Trojan drops the following files:
- %Program Files%\NetMeeting\1328054358
- %Program Files%\NetMeeting\34062.ini
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://edonkeyserver4.{BLOCKED}0.org/ConfigDownload/GameVersionUpdate1.txt
- http://video.{BLOCKED}vice.cn/ConfigDownload/GameVersionUpdate1.txt
- http://test.{BLOCKED}8888.cn/c8c_ini/GameVersionUpdate90.dll
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- GameVersionUpdate1 = "%Program Files%\gameversionupdate1\GameUpdate1.exe"
Step 4
Search and delete these files
- %Program Files%\NetMeeting\1328054358
- %Program Files%\NetMeeting\34062.ini
Step 5
Search and delete these folders
- %Program Files%\Microsoft
- %Program Files%\gameversionupdate1
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_BHO.SMUM5. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 7
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System Root%\3547e1f287.exe
- %System Root%\3547e1f2871.exe
- %System Root%\3547e1f2872.exe
- %System Root%\3547e1f2873.exe
- %System Root%\3547e1f2874.exe
- %System Root%\3547e1f2875.exe
- %System Root%\3547e1f2876.exe
- %System Root%\3547e1f2877.exe
- %System Root%\3547e1f2878.exe
- %System Root%\3547e1f2879.exe
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