WORM_KOLAB.CG
Worm:Win32/Rimecud.B (Microsoft), W32/Rimecud.gen.bm (McAfee), W32.Pilleuz (Symantec), P2P-Worm.Win32.Palevo.bpio (Kaspersky)
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: Yes
In the wild: Yes
OVERVIEW
Downloaded from P2P shares, Via removable drives, Downloaded from the Internet, Dropped by other malware
This worm arrives via peer-to-peer (P2P) shares. It 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.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
352,256 bytes
EXE
Yes
13 May 2011
Compromises system security, Connects to URLs/IPs
Arrival Details
This worm arrives via peer-to-peer (P2P) shares.
It 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 component file(s):
- {malware location}\Desktop.ini
- %System Root%\RECYCLER\{SID}\Desktop.ini
- {removable drive letter}:\usecure\desktop.ini
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It drops the following copies of itself into the affected system:
- %System Root%\RECYCLER\{SID}\MsMxEng.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It injects threads into the following normal process(es):
- Explorer.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 NT\CurrentVersion\Winlogon
Taskman = "%System Root%\RECYCLER\{SID}\MsMxEng.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "{malware location}\{malware name}"
Propagation
This worm creates the following folders in all removable drives:
- {removable drive letter}:\usecure
It drops copies of itself into the following folders used in peer-to-peer (P2P) networks:
- Kazaa
- BearShare
- iMesh
- Shareaza
- DC++
- Emule
- LimeWire
- Ares
It drops the following copy(ies) of itself in all removable drives:
- {removable drive letter}:\usecure\usecure32.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
{garbage codes}
[autorun
{garbage codes}
open=usecure/usecure32.exe
{garbage codes}
icon=%SystemRoot%\system32\SHELL32.dll,4
;{garbage codes}
action=Open folder to view files using Windows Explorer
;{garbage codes}
USEAUToplay=1
;{garbage codes}
shell\open\command=usecure/usecure32.exe
;{garbage codes}
shell\explore\command=usecure/usecure32.exe
{garbage codes}
Backdoor Routine
This worm opens the following port(s) where it listens for remote commands:
- 44403
It executes the following commands from a remote malicious user:
- Performs denial of service (DoS) attacks on affected systems using SYN flooding
- Steal user credentials
- Infect network computers using VNC
- Download arbitrary files
- Execute arbitrary commands
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- www.{BLOCKED}eslounge.com
- www.{BLOCKED}racypetition.com
- www.{BLOCKED}lmind.cn
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.300
8.154.03
13 May 2011
8.155.00
13 May 2011
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_KOLAB.CG
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 NT\CurrentVersion\Winlogon
- Taskman = "%System Root%\RECYCLER\{SID}\MsMxEng.exe"
- Taskman = "%System Root%\RECYCLER\{SID}\MsMxEng.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- Taskman = "{malware location}\{malware name}"
- Taskman = "{malware location}\{malware name}"
Step 5
Search and delete these folders
- %System Root%\RECYCLER\{SID}
- {removable drive letter}:\usecure
Step 6
Search and delete this file
- {malware location}\Desktop.ini
Step 7
Search and delete AUTORUN.INF files created by WORM_KOLAB.CG that contain these strings
[autorun
{garbage codes}
open=usecure/usecure32.exe
{garbage codes}
icon=%SystemRoot%\system32\SHELL32.dll,4
;{garbage codes}
action=Open folder to view files using Windows Explorer
;{garbage codes}
USEAUToplay=1
;{garbage codes}
shell\open\\command=usecure/usecure32.exe
;{garbage codes}
shell\\explore\command=usecure/usecure32.exe
{garbage codes}
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_KOLAB.CG. 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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