WORM_KOLAB.DP
Trojan:Win32/VB (Microsoft); Trojan.Win32.Buzus.crcg (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
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.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
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 and executes them:
- %WINDIR%\System.exe
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 Services = "System.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Terminal Server\
Install\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Services = "System.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and filename} = "{malware path and filename}:*:Enabled:Windows Services"
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {Drive}\UxxSBSTART\532NJ42-4SDJK5-DSA5288FDS-R23RBKAF\usb_driver.com
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Backdoor Routine
This worm connects to any of the following IRC server(s):
- bk1.{BLOCKED}h.cx
It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:
- File Update
- File Download
- File Execution
- Terminate Applications
NOTES:
The malware will not execute if the following processes are present on the affected system:
- filemon
- procmon
- tcpview
SOLUTION
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
Terminate a malware/grayware process
*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.
- %WINDIR%\System.exe
Step 3
Search and delete these files
- %WINDIR%\System.exe
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
- Windows Services = "System.exe"
- Windows Services = "System.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Services = "System.exe"
- Windows Services = "System.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and filename} {malware path and filename}:*:Enabled:Windows Services
- {malware path and filename} {malware path and filename}:*:Enabled:Windows Services
Step 5
Scan your computer with your Trend Micro product to delete files detected as WORM_KOLAB.DP. 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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