BKDR_DATPER.A

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 may be downloaded by other malware/grayware/spyware from remote sites.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

It modifies the Internet Explorer Zone Settings.

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.

It may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:

• d4fy3ykdk2ddssr

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Report gathered information:
  • System Language
  • Computer Name
  • OS Version
  • Host Name
  • Arbitrary List of Files
  • Available Drives and their types
• Create/Terminate Arbitrary Processes
• Create/Delete Arbitrary Files
• Download/Upload arbitrary files from/to the C&C server
• Allocate console to process
  • Console name: ndkkwqgcm
• Terminate Self

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}le.com/im/images/index.php?random string}={hardcoded string 1}{hardcoded string 2}{type identifier byte: "1"=recv, "2"=send}{random string or encrypted user data}

Web Browser Home Page and Search Page Modification

This backdoor modifies the Internet Explorer Zone Settings.

NOTES:

The malware has an activity time between 9:00 AM and 5:00 PM.