BKDR_DESTOVER.B

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.

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"