WORM_SILLY.CC
Win32:Sality (Avast), Trojan horse Citem.AKG (AVG), Worm:Win32/Niexrof.gen!A (Microsoft), Trojan.Win32.VB.bvpc (Kaspersky), Troj/Doctrix-A (Webroot)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It 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
257,280 bytes
EXE
Yes
08 Apr 2009
Arrival Details
This worm arrives via removable drives.
It 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:
- %Windows%\{malware file name}.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
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 File = "%WINDOWS%\{malware file name}.exe"
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {malware file name}.exe
Dropping Routine
This worm drops the following files:
- %Windows%\Pacuks
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
SOLUTION
9.300
5.883.00
08 Apr 2009
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
Scan your computer with your Trend Micro product and note files detected as WORM_SILLY.CC
Step 3
Restart in Safe Mode
Step 4
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 File = "%WINDOWS%\{malware file name}.exe"
- System File = "%WINDOWS%\{malware file name}.exe"
Step 5
Search and delete these files
- %Windows%\Pacuks
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_SILLY.CC. 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.
Did this description help? Tell us how we did.