WORM_KILLAV.RB
Worm:Win32/Slenfbot.YT (Microsoft); QHosts-131 (McAfee); W32.SillyDC (Symantec); FraudTool.Win32.InternetProtection.ek!a (v) (Sunbelt); Trojan horse Generic10.BEXY (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
45,056 bytes
EXE
Yes
16 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%\windowslivemsn.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
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
Windows Messenger Live Startup = "windowslivemsn.exe"
Other System Modifications
This worm modifies the following file(s):
- %System%\drivers\etc\hosts
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It deletes the following files:
- %Program Files%\Windows Media Player\npdrmv2.zip
- %Program Files%\Windows Media Player\npds.zip
- %System%\chcp.com
- %System%\command.com
- %System%\diskcomp.com
- %System%\diskcopy.com
- %System%\edit.com
- %System%\format.com
- %System%\graftabl.com
- %System%\graphics.com
- %System%\kb16.com
- %System%\loadfix.com
- %System%\mode.com
- %System%\more.com
- %System%\tree.com
- %System%\win.com
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
- Windows Messenger Live Startup = "windowslivemsn.exe"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_KILLAV.RB. 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 5
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\drivers\etc\hosts
Step 6
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.
- %Program Files%\Windows Media Player\npdrmv2.zip
- %Program Files%\Windows Media Player\npds.zip
- %System%\chcp.com
- %System%\command.com
- %System%\diskcomp.com
- %System%\diskcopy.com
- %System%\edit.com
- %System%\format.com
- %System%\graftabl.com
- %System%\graphics.com
- %System%\kb16.com
- %System%\loadfix.com
- %System%\mode.com
- %System%\more.com
- %System%\tree.com
- %System%\win.com
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