WORM_BUTILEG.B
TrojanDownloader:Win32/Injector.gen!W (Microsoft); W32/Generic.acg!worm !! (McAfee); W32.Fubalca.D (Symantec); PAK:PE_Patch, PAK:UPack, Worm.Win32.Butileg.b (Kaspersky); Trojan.Win32.Packer.Upack0.3.9 (ep) (Sunbelt); Win32.Worm.Butileg.D (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
6,436 bytes
EXE
No
20 Jan 2012
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Other System Modifications
This worm deletes the following files:
- %Windows%\debug.txt
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Dropping Routine
This worm drops the following files:
- %Program Files%\Common Files\Microsoft Shared\Web Folders\MSOSV.EXE
- %Windows%\svchost.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other Details
This worm connects to the following possibly malicious URL:
- http://temp.{BLOCKED}8.com/table.gif
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
Search and delete these files
- %Program Files%\Common Files\Microsoft Shared\Web Folders\MSOSV.EXE
- %Windows%\svchost.exe
Step 3
Scan your computer with your Trend Micro product to delete files detected as WORM_BUTILEG.B. 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 4
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. %Windows%\debug.txt
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