Analysis by: Marvelous Pelin
ALIASES:

Trojan:Win32/Dynamer!ac(Microsoft); Trojan.RansomLock.AT(Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan 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: 535,040 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 03 Aug 2016
Payload: Displays message/message boxes

Arrival Details

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

Other Details

This Trojan does the following:

  • It deletes shadow copies by executing the following command: vssadmin.exe delete shadows /For=S: /all /quiet
  • It displays the following message box if the user clicks the button and the input is incorrect:
  • It locks the screen and display the following image:

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.704.06
FIRST VSAPI PATTERN DATE: 09 Aug 2016
VSAPI OPR PATTERN File: 12.705.00
VSAPI OPR PATTERN Date: 10 Aug 2016

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 normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_FAKELOCK.E. 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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