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ELF_MOKES.A

February 08, 2016
 Analysis by: David John Agni
 ALIASES:

Backdoor.Win32.Mokes.imw (Kaspersky)

 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:

Downloaded from the Internet, 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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size:

5554404 bytes

File Type:

EXE

File Compression:

UPX

Memory Resident:

Yes

Initial Samples Received Date:

21 Jan 2016

Payload:

Connects to URLs/IPs, Compromises system security

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 drops the following files:

  • $HOME/.config/autostart/$filename.desktop -> to execute itself every system startup

It drops and executes the following files:

  • File may be dropped in any of the following locations:
    $Home/.local/share/.dropbox/DropboxCache
    $Home/.local/share/.mozilla/firefox/profiled

It drops the following non-malicious files:

  • {malware dropped copy folder}\version - contains malware version and full path of the dropped copy

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

  • Keylogging and monitors mouse inputs
  • Capture screenshots
  • Capture audio

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

  • http://{BLOCKED}.{BLOCKED}.218.177/v1
  • http://{BLOCKED}in.com/host.dat

Dropping Routine

This backdoor drops the following file(s), into which it saves gathered information:

  • %User Temp%\ss0-{Date}-{Time}-{ms}.sst (Captured Screenshots)
  • %User Temp%\aa0-{Date}-{Time}-{ms}.aat (Captured Audio, WAV)
  • %User Temp%\kk0-{Date}-{Time}-{ms}.kkt (Keylogs)
  • %User Temp%\dd0-{Date}-{Time}-{ms}.ddt (Arbitrary Data)

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

  SOLUTION

Minimum Scan Engine:

9.800

VSAPI OPR PATTERN File:

12.313.00

VSAPI OPR PATTERN Date:

04 Feb 2016

Scan your computer with your Trend Micro product to delete files detected as ELF_MOKES.A. 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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