TROJ_MALAGENT.GZ
Windows 2000, XP, Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
TECHNICAL DETAILS
119,296 bytes
EXE
No
13 Aug 2010
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
EnableConcurrentSessions = 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server\Licensing Core
EnableConcurrentSessions = 1
Dropping Routine
This Trojan drops the following files:
- %Windows%\host32.exe - detected as TROJ_DROPPR.SMH
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
SOLUTION
8.900
7.380.06
13 Aug 2010
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
Remove malware files dropped/downloaded by TROJ_MALAGENT.GZ
TROJ_DROPPR.SMH
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
- EnableConcurrentSessions=1
- EnableConcurrentSessions=1
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core
- EnableConcurrentSessions=1
- EnableConcurrentSessions=1
Step 4
Restore this modified 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
- From: Userinit=%System%\userinit.exe, %Windows%\host32.exe,
To: %System%\userinit.exe,
- From: Userinit=%System%\userinit.exe, %Windows%\host32.exe,
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: AllowMultipleTSSessions=1
To: 0
- From: AllowMultipleTSSessions=1
- In HKEY_LOCAL_MACHINES\SYSTEM\CurrentControlSet\Control\TerminalServer
- From: fDenyTSConnections=0
To: 1
- From: fDenyTSConnections=0
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_MALAGENT.GZ. 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.
Did this description help? Tell us how we did.