BKDR_DLOADR.BGK
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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 does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
It does not drop any other file.
It does not have any information-stealing capability.
TECHNICAL DETAILS
TCP Port 443, TCP port 8080 (HTTP Alternate)
19,456 bytes
EXE
Yes
15 Jun 2012
Connects to URLs/IPs
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.
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Enumerate processes
- Start remote command prompt
- Create a file for writing
- Write to the opened file
- Open/Execute a file
- Read a part or an entire file
- Close connection to C&C server
- Delete a file
- Terminate process
- Enumerate drives and their types
- List files in the current directory
- Delete the file C:\WINDOWS\Tasks\svchost.exe, remove the registry entry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run tasksvc, then exit
It connects to the following websites to send and receive information:
- {BLOCKED}.{BLOCKED}.202.197:443
- usababa.{BLOCKED}w.us:443
Dropping Routine
This backdoor does not drop any other file.
Information Theft
This backdoor does not have any information-stealing capability.
NOTES:
This backdoor connects to its C&C server through a proxy server at {BLOCKED}.{BLOCKED}.16.21:8080.
This backdoor does not have rootkit capabilities.
This backdoor does not exploit any vulnerability.
SOLUTION
9.200
9.196.03
15 Jun 2012
9.197.00
16 Jun 2012
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
Identify and terminate files detected as BKDR_DLOADR.BGK
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Scan your computer with your Trend Micro product to delete files detected as BKDR_DLOADR.BGK. 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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