BKDR_DESTOVER.B
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
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.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Move specified file to another directory
- Enumerate files in specified directory
- Enumerate fixed drives and retrieve free disk space
- Download arbitrary files
- Upload arbitrary files
- Execute arbitrary files
- Drop a dummy file
- Check for a specified file's existence
- Enumerate Processes and Modules
- Terminate specified process
- Gather system information
- Reconfigure CnC connection
- Retrieve current working directory and change to another
NOTES:
The following are the information it gathers:
- Computer name
- Operating system version
- Processor information
- IPv4 connections
- Existence of a specified process
- Data from specified registry entry
- Network Adapter information
It queries the data in the following registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WMI\Security
xc123456-efff-87cc-37abcdef9
The data queried from the said registry will be used as the port that it will open to listen for backdoor commands.
It issues the following firewall configuration command to add an opening for the port mentioned above and name it as "adp":
- cmd.exe /c netsh firewall add portopening TCP {port}"adp"
SOLUTION
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
Scan your computer with your Trend Micro product to delete files detected as BKDR_DESTOVER.B. 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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