TROJ_WAUCHOS.ZPT
Win32/TrojanDownloader.Wauchos.A trojan (Eset), VirTool:Win32/CeeInject (Microsoft)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
98,501 bytes
EXE
Yes
08 Mar 2013
Arrival Details
This Trojan 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 Trojan drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\svchost.exe - if running in virtual machine
- %System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name} - if running in admin account
- %User Temp%\ms{random characters}.{extension name} - if not running in admin account
(Note: %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\ms{random}.{extension name}"
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- www.update.microsoft.com
It connects to the following possibly malicious URL:
- http://{BLOCKED}ososoft.ru/in.php
- http://{BLOCKED}onzmwuehky.nl/in.php
- http://{BLOCKED}wsqhct.in/in.php
- http://{BLOCKED}tvmein.in/in.php
- http://{BLOCKED}ph.su/in.php
- http://{BLOCKED}cgrvkj.ru/in.php
NOTES:
The {extension name} of the dropped copy is any of the following:
- bat
- cmd
- com
- exe
- exe
- pif
- scr
SOLUTION
9.300
9.773.00
08 Mar 2013
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 TROJ_WAUCHOS.ZPT
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\CurrentVersion\Run
- SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"
- SunJavaUpdateSched = "%System Root%\Documents and Settings\All Users\svchost.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
- {random number} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\ms{random characters}.{extension name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%User Temp%\ms{random}.{extension name}"
- Load = "%User Temp%\ms{random}.{extension name}"
Step 5
Search and delete these files
- %User Temp%\{random number}.exe
- %System Root%\Documents and Settings\All Users\ms{random number}.dat
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_WAUCHOS.ZPT. 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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