WORM_PALEVO.CJ
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
However, as of this writing, the said sites are inaccessible.
It drops copies of itself into all the removable drives connected to an affected system. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
TECHNICAL DETAILS
Arrival Details
However, as of this writing, the said sites are inaccessible.
Installation
This worm drops the following copies of itself into the affected system:
- %Application Data%\ydze.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It injects itself into the following processes running in the affected system's memory:
- 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 = %Application Data%\ydze.exe
Propagation
This worm creates the following folders in all removable drives:
- Kick,Ass.2010
It drops copies of itself into all the removable drives connected to an affected system.
It drops the following copy(ies) of itself in all removable drives:
- {Drive:}\Kick,Ass.2010\Kick.Ass.2010.R5.XviD-triniwarez.com.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}
[AutoRun]
{garbage}
OPEN=Kick,Ass.2010//Kick.Ass.2010.R5.XviD-triniwarez.com.exe
{garbage}
UstAutoplay=1
{garbage}
Shell\EXplore\COMMAND=Kick,Ass.2010\Kick.Ass.2010.R5.XviD-triniwarez.com.exe
{garbage}
Shell\OPEN\COMMAND=Kick,Ass.2010//\Kick.Ass.2010.R5.XviD-triniwarez.com.exe
{garbage}
Download Routine
This worm connects to the following malicious URLs:
- {BLOCKED}bam.info
- {BLOCKED}rystorm.net
- {BLOCKED}ucks.com
SOLUTION
Step 1
Scan your computer with your Trend Micro product and note files detected as WORM_PALEVO.CJ
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 NT\CurrentVersion\Winlogon
- Taskman=%Application Data%\ydze.exe
- Taskman=%Application Data%\ydze.exe
Step 4
Search and delete this file
- %Application Data%\ydze.exe
Step 5
Search and delete these folders
- Kick,Ass.2010
Step 6
Search and delete AUTORUN.INF files created by WORM_PALEVO.CJ that contain these strings
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_PALEVO.CJ. 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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