TROJ_LAOSHEN.F
Trojan:Win32/Laoshen.B (Microsoft); Laoren (McAfee); Trojan Horse (Symantec); PAK:UPX, Trojan.Win32.Laoshen.b, Trojan.Win32.Laoshen.b (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Laoshen.B (FSecure)
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
15,824 bytes
EXE
No
21 Sep 2012
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.
Other System Modifications
This Trojan deletes the following files:
- %Windows%\SYSBCKUP\rb000.cab
- %Windows%\SYSBCKUP\rb001.cab
- %Windows%\SYSBCKUP\rb002.cab
- %Windows%\SYSBCKUP\rb003.cab
- %Windows%\SYSBCKUP\rb004.cab
- %Windows%\SYSBCKUP\rb005.cab
- %Windows%\SYSBCKUP\rb006.cab
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\Laorenshen
HKEY_CLASSES_ROOT\LaoshenMp3
HKEY_CLASSES_ROOT\LaoshenRm
HKEY_CLASSES_ROOT\.RM
HKEY_CLASSES_ROOT\LaoshenDAT
HKEY_CLASSES_ROOT\LaoshenAVI
HKEY_CLASSES_ROOT\LaoshenTXT
HKEY_CLASSES_ROOT\LaoshenCOM
HKEY_CLASSES_ROOT\LaoshenZIP
HKEY_CLASSES_ROOT\LaoshenRAR
HKEY_CLASSES_ROOT\.RAR
HKEY_CLASSES_ROOT\LaoshenREG
HKEY_CLASSES_ROOT\LaoshenDLL
HKEY_CLASSES_ROOT\LaoshenBAT
HKEY_CLASSES_ROOT\LaoshenSYS
HKEY_CLASSES_ROOT\LaoshenINI
HKEY_CLASSES_ROOT\LaoshenLOG
HKEY_CLASSES_ROOT\LaoshenBIN
HKEY_CLASSES_ROOT\LaoshenDOC
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Laorenshen
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Laorenshen
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenMp3
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenMp3
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenRm
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenRm
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDAT
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDAT
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenAVI
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenAVI
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenTXT
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenTXT
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenCOM
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenCOM
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenZIP
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenZIP
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenRAR
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenRAR
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenREG
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenREG
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDLL
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDLL
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenBAT
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenBAT
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenSYS
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenSYS
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenINI
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenINI
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenLOG
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenLOG
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenBIN
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenBIN
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDOC
DefaultIcon = "%System Root%\Laorenshen.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
LaoshenDOC
Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
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
Delete this registry key
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_CLASSES_ROOT
- Laorenshen
- In HKEY_CLASSES_ROOT
- LaoshenMp3
- In HKEY_CLASSES_ROOT
- LaoshenRm
- In HKEY_CLASSES_ROOT
- .RM
- In HKEY_CLASSES_ROOT
- LaoshenDAT
- In HKEY_CLASSES_ROOT
- LaoshenAVI
- In HKEY_CLASSES_ROOT
- LaoshenTXT
- In HKEY_CLASSES_ROOT
- LaoshenCOM
- In HKEY_CLASSES_ROOT
- LaoshenZIP
- In HKEY_CLASSES_ROOT
- LaoshenRAR
- In HKEY_CLASSES_ROOT
- .RAR
- In HKEY_CLASSES_ROOT
- LaoshenREG
- In HKEY_CLASSES_ROOT
- LaoshenDLL
- In HKEY_CLASSES_ROOT
- LaoshenBAT
- In HKEY_CLASSES_ROOT
- LaoshenSYS
- In HKEY_CLASSES_ROOT
- LaoshenINI
- In HKEY_CLASSES_ROOT
- LaoshenLOG
- In HKEY_CLASSES_ROOT
- LaoshenBIN
- In HKEY_CLASSES_ROOT
- LaoshenDOC
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\Classes\Laorenshen
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Laorenshen
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenMp3
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenMp3
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenRm
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenRm
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDAT
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDAT
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenAVI
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenAVI
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenTXT
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenTXT
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenCOM
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenCOM
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenZIP
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenZIP
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenRAR
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenRAR
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenREG
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenREG
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDLL
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDLL
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenBAT
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenBAT
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenSYS
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenSYS
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenINI
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenINI
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenLOG
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenLOG
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenBIN
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenBIN
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDOC
- DefaultIcon = "%System Root%\Laorenshen.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LaoshenDOC
- Shell\Open\Command = "%System Root%\Laorenshen.exe %1"
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_LAOSHEN.F. 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.
Step 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %Windows%\SYSBCKUP\rb000.cab
- %Windows%\SYSBCKUP\rb001.cab
- %Windows%\SYSBCKUP\rb002.cab
- %Windows%\SYSBCKUP\rb003.cab
- %Windows%\SYSBCKUP\rb004.cab
- %Windows%\SYSBCKUP\rb005.cab
- %Windows%\SYSBCKUP\rb006.cab
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