BKDR_AGENT.JVRA
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
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 injects its dropped file/component to specific processes.
TECHNICAL DETAILS
130,048 bytes
EXE
Yes
02 Aug 2012
Connects to URLs/IPs, Drops 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 injects its dropped file/component to the following processes:
- IEXPLORE.EXE
Autostart Technique
This backdoor modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Netman\Parameters
ServiceDll = "{malware path}\tabcteng.dll"
(Note: The default value data of the said registry entry is "%SystemRoot%\System32\netman.dll".)
Other System Modifications
This backdoor modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Netman
Start = "2"
(Note: The default value data of the said registry entry is "3".)
Backdoor Routine
This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:
- www.{BLOCKED}or.{BLOCKED}ns.com
- {BLOCKED}n.{BLOCKED}user.com
Dropping Routine
This backdoor drops the following files:
- {malware path}\tabcteng.dll - BKDR_AGENT.JVRA
NOTES:
This backdoor is capable of perfoming the following commands:
- Download/upload File
- Create/read/delete File
- List running process
- List service registry
- Create/modify/terminate Service
- Get system information
- Take screenshot
- Keylogging
- Receive shell command
- Terminate self
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
Scan your computer with your Trend Micro product and note files detected as BKDR_AGENT.JVRA
Step 3
Restart in Safe Mode
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\SYSTEM\CurrentControlSet\Services\Netman
- From: Start = "2"
To: Start = "3"
- From: Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netman\Parameters
- From: ServiceDll = "{malware path}\tabcteng.dll"
To: ServiceDll = "%SystemRoot%\System32\netman.dll"
- From: ServiceDll = "{malware path}\tabcteng.dll"
Step 5
Search and delete the file detected as BKDR_AGENT.JVRA
*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
To manually delete a malware/grayware file from the affected system:
- Right-click Start then click Search....
- In the Named input box, type the name of the file that was detected earlier.
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_AGENT.JVRA. 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.