BKDR_SERVSTAR.JQ
Trojan:Win32/ServStart.gen!A (Microsoft), Backdoor.Trojan (Symantec), RDN/Generic.dx!ia (McAfee)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
It deletes itself after execution.
TECHNICAL DETAILS
163,840 bytes
EXE
Yes
01 Mar 2013
Compromises system security, Connects to URLs/IPs, Collects system information, Downloads files, Executes files
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %System%\DMAgent.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
ImagePath = "%System%\DMAgent.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
Security =
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows Adobe Flash Game 3.6
Enum =
Backdoor Routine
This backdoor opens the following ports:
- TCP 777
It executes the following commands from a remote malicious user:
- Open a specific URL with Internet Explorer
- Download and Execute Arbitrary Files
- Update or Uninstall Itself
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.59.118
Information Theft
This backdoor gathers the following data:
- Hardware Information
- Operating System
Other Details
This backdoor deletes itself after execution.
NOTES:
This backdoor opens port(s) where it listens for remote commands.
SOLUTION
9.300
9.759.00
01 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
Restart in Safe Mode
Step 3
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- Windows Adobe Flash Game 3.6
- Windows Adobe Flash Game 3.6
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_SERVSTAR.JQ. 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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