Analysis by: Julie Anne Cabuhat
ALIASES:

Backdoor.Destover!gen2 (Symantec), Backdoor.Destover.A (ALYac)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: 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 executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 94,208 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 18 Jan 2017
Payload: Collects system information, Connects to URLs/IPs, Creates files, Terminates processes, Deletes files, 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.

Backdoor Routine

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

  • Enumerate Files in specified directory
  • Enumerate Processes and Modules
  • Check for specific file's existence
  • Run Process
  • Create File
  • Terminate Specific Process
  • Change file attributes
  • Delete File
  • Drop dummy file
  • Move specified file to another directory
  • Gather system information
  • Retrieve current working directory and change to another

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

  • {BLOCKED}.{BLOCKED}.132.222:443
  • {BLOCKED}.{BLOCKED}.189.174:443

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.220.04
FIRST VSAPI PATTERN DATE: 14 Feb 2017
VSAPI OPR PATTERN File: 13.221.00
VSAPI OPR PATTERN Date: 15 Feb 2017

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.ADU. 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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