Analysis by: Mio Fidel Villena
ALIASES:

Trojan.Win32.Diztakun.bfry (KASPERSKY), Trojan:Win32/Skeeyah.A!bit (MICROSOFT), Trojan.Diztakun (QUICKHEAL)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 289,792 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 22 Jan 2018
Payload: Terminates processes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Ransomware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = 1

Process Termination

This Ransomware terminates the following processes if found running in the affected system's memory:

  • taskmgr.exe

NOTES:

This ransomware does not encrypt any files in the computer, instead an audio will be played and the following lockscreen will be displayed:

After some time, it will also display a ransom note:

The correct account name is: Dominator

The correct account code is: 0

It will, then, exit its process.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.920.04
FIRST VSAPI PATTERN DATE: 22 Jan 2018
VSAPI OPR PATTERN File: 13.921.00
VSAPI OPR PATTERN Date: 23 Jan 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • From: DisableTaskMgr = 1"
      To: DisableTaskMgr = 0"

Step 5

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