WORM_BENJAMIN.A
Trojan:Win32/Sisron (Microsoft); W32/Benjamin.worm (McAfee); P2P-Worm.Win32.Benjamin.a (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Trojan horse Generic21.AKZF (AVG)
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
541,647 bytes
EXE
Yes
30 May 2013
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.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\EXPLORER.SCR
- %Temp%\sys32\$$FREE$$.scr
- %Temp%\sys32\$$FREE$$ .exe
- %Temp%\sys32\$1.scr
- %Temp%\sys32\$1 .exe
- %Temp%\sys32\$2.scr
- %Temp%\sys32\$2 .exe
- %Temp%\sys32\$30.scr
- %Temp%\sys32\$30 .exe
- %Temp%\sys32\$30 FOR FREE.scr
- %Temp%\sys32\$30 FOR FREE .exe
- %Temp%\sys32\0.scr
- %Temp%\sys32\0 .exe
- %Temp%\sys32\1.scr
- %Temp%\sys32\1 .exe
- %Temp%\sys32\10000.scr
- %Temp%\sys32\10000 .exe
- %Temp%\sys32\100000.scr
- %Temp%\sys32\100000 .exe
- %Temp%\sys32\1000000.scr
- %Temp%\sys32\1000000 .exe
- %Temp%\sys32\13 Geister -divx-full-downloader.exe
- %Temp%\sys32\13 Geister-divx-full-downloader.exe
- %Temp%\sys32\13 Geister-Filme-full-downloader.exe
- %Temp%\sys32\15 Minutes-divx-full-downloader.exe
- %Temp%\sys32\15 Minutes-Filme-full-downloader.exe
- %Temp%\sys32\1503 A.D. - The New World-installer.scr
- %Temp%\sys32\1503 A.D. - The New World-installer .exe
- %Temp%\sys32\1914-TheGreatWar.scr
- %Temp%\sys32\1914-TheGreatWar .exe
- %Temp%\sys32\1999.scr
- %Temp%\sys32\1999 .exe
- %Temp%\sys32\2.scr
- %Temp%\sys32\2 .exe
- %Temp%\sys32\2001.scr
- %Temp%\sys32\2001 .exe
- %Temp%\sys32\2002.scr
- %Temp%\sys32\2002 .exe
- %Temp%\sys32\2002-DurchgeknalltimAll.scr
- %Temp%\sys32\2002-DurchgeknalltimAll .exe
- %Temp%\sys32\21.scr
- %Temp%\sys32\21 .exe
- %Temp%\sys32\3.scr
- %Temp%\sys32\3 .exe
- %Temp%\sys32\3D Gamemaker-full-downloader.exe
- %Temp%\sys32\3D-Weltatlas-full-downloader.exe
- %Temp%\sys32\3rd World-installer.scr
- %Temp%\sys32\3rd World-installer .exe
- %Temp%\sys32\4.scr
- %Temp%\sys32\4 .exe
- %Temp%\sys32\4x4 EVO 2- Games -full-downloader.exe
- %Temp%\sys32\5.scr
- %Temp%\sys32\5 .exe
- %Temp%\sys32\6.scr
- %Temp%\sys32\6 .exe
- %Temp%\sys32\666TrauekeinemmitdemDuschläfst.scr
- %Temp%\sys32\666TrauekeinemmitdemDuschläfst .exe
- %Temp%\sys32\69.scr
- %Temp%\sys32\69 .exe
- %Temp%\sys32\7.scr
- %Temp%\sys32\7 .exe
- %Temp%\sys32\777.scr
- %Temp%\sys32\777 .exe
- %Temp%\sys32\8.scr
- %Temp%\sys32\8 .exe
- %Temp%\sys32\88.scr
- %Temp%\sys32\88 .exe
- %Temp%\sys32\888.scr
- %Temp%\sys32\888 .exe
- %Temp%\sys32\9.scr
- %Temp%\sys32\9 .exe
- %Temp%\sys32\A.I-Artificial Intelligence- divx -full-downloader.exe
- %Temp%\sys32\A.I-Artificial Intelligence- Filme -full-downloader.exe
- %Temp%\sys32\ABeautifulMind.scr
- %Temp%\sys32\ABeautifulMind .exe
- %Temp%\sys32\AbsoluteZero-installer.scr
- %Temp%\sys32\AbsoluteZero-installer .exe
- %Temp%\sys32\acdsee4.scr
- %Temp%\sys32\acdsee4 .exe
- %Temp%\sys32\ACDSeePowerPackRetail-installer.scr
- %Temp%\sys32\ACDSeePowerPackRetail-installer .exe
- %Temp%\sys32\Achterbahn Dasigner (Disney)-Games-full-downloader.exe
- %Temp%\sys32\Achterbahn Dasigner (Disney)-Spiel-full-downloader.exe
- %Temp%\sys32\Achterbahn Designer -full-downloader.exe
- %Temp%\sys32\AchterbahnDesignerStrategie.scr
- %Temp%\sys32\AchterbahnDesignerStrategie .exe
- %Temp%\sys32\Acrobat Capture 3.0 -full-downloader.exe
- %Temp%\sys32\Ad-Aware.scr
- %Temp%\sys32\Ad-Aware .exe
- %Temp%\sys32\Adobe InDesign 2.0 Build 416 -full-downloader.exe
- %Temp%\sys32\Adobe Pagemaker -full-downloader.exe
- %Temp%\sys32\Adobe Photoshop 6.0 -full-downloader.exe
- %Temp%\sys32\Adobe Photoshop update (6.1) -full-downloader.exe
- %Temp%\sys32\Adobe-Streamline-installer.scr
- %Temp%\sys32\Adobe-Streamline-installer .exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)
It creates the following folders:
- %Temp%\sys32
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System-Service = "%System%\EXPLORER.SCR"
Other System Modifications
This worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
syscod = "00EC75F74F00ECEBBAEC"
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- System-Service = "%System%\EXPLORER.SCR"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
- syscod = "00EC75F74F00ECEBBAEC"
Step 4
Search and delete this folder
- %Temp%\sys32
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_BENJAMIN.A. 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.
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