Analysis by: John Anthony Banes
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 155,648 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 22 Mar 2018
Payload: Collects system information, 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.

Installation

This Backdoor is injected into the following processes running in memory:

  • explorer.exe

Backdoor Routine

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

  • Rename specified file or move to another directory
  • Send the type of each logical drive in the affected system
  • Download arbitrary files
  • Upload arbitrary files
  • Execute arbitrary files
  • Check for a specified file's existence
  • Terminate specified process
  • Send computer name and operating system version
  • Uninstall itself
  • Steal archive files with certain extensions (.Z, .zip, .zoo, .arc, .lzh, .arj, .gz, .tgz)

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

  • {BLOCKED}.{BLOCKED}.122.70:443
  • {BLOCKED}.{BLOCKED}.188.53:443
  • {BLOCKED}.{BLOCKED}.36.183:443

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 14.146.04
FIRST VSAPI PATTERN DATE: 23 Mar 2018
VSAPI OPR PATTERN File: 14.147.00
VSAPI OPR PATTERN Date: 24 Mar 2018

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

Restart in Safe Mode

[ Learn More ]

Step 3

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_DESTOVER.AEB. 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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