WORM_PSEUDOSI.BX
Trojan:Win32/Meredrop (Microsoft); W32/Autorun.worm.gy (McAfee); Backdoor.Graybird (Symantec); PAK:PE_Patch.PseudoSign, P2P-Worm.Win32.Agent.lf (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Gen:Variant.Kazy.3947 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
454,668 bytes
EXE
Yes
04 Jan 2012
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 Root%\¡¡¡¡¡¡.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Explorer = "%System%\drivers\TXPlatform.exe"
Other System Modifications
This worm deletes the following folders:
- %System Root%\autorun.inf
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDriveTypeAutoRun = 8
Dropping Routine
This worm drops the following files:
- %Program Files%\Desktop_1.ini
- %Program Files%\MSN Gaming Zone\Desktop_1.ini
- %Program Files%\Online Services\Desktop_1.ini
- %Program Files%\Uninstall Information\Desktop_1.ini
- %Program Files%\WinPcap\Desktop_1.ini
- %Program Files%\xerox\Desktop_1.ini
- %Program Files%\xerox\nwwia\Desktop_1.ini
- %System Root%\RECYCLER\Desktop_1.ini
- %System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-1003\Desktop_1.ini
- %System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-500\Desktop_1.ini
- %System Root%\autorun.inf
- %User Temp%\myUPdatetxt.txt
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
Other Details
This worm connects to the following possibly malicious URL:
- http://www.52CPS.COM/goto/down.txt
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Enable Registry Editor, Task Manager, and Folder options
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Explorer="%System%\drivers\TXPlatform.exe"
Step 5
Search and delete these files
- %Program Files%\Desktop_1.ini
- %Program Files%\MSN Gaming Zone\Desktop_1.ini
- %Program Files%\Online Services\Desktop_1.ini
- %Program Files%\Uninstall Information\Desktop_1.ini
- %Program Files%\WinPcap\Desktop_1.ini
- %Program Files%\xerox\Desktop_1.ini
- %Program Files%\xerox\nwwia\Desktop_1.ini
- %System Root%\RECYCLER\Desktop_1.ini
- %System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-1003\Desktop_1.ini
- %System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-500\Desktop_1.ini
- %System Root%\autorun.inf
- %User Temp%\myUPdatetxt.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_PSEUDOSI.BX. 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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