Analysis by: Jemimah Mae Molina
ALIASES:

W32/CryFile!tr (FORTINET); Trojan-Ransom.Rokku (IKARUS)

 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: Downloaded from the Internet, Dropped by other malware

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.

It encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size: 169,472 bytes
File Type: EXE
File Compression: UPX
Memory Resident: No
Initial Samples Received Date: 12 Nov 2018
Payload: Displays message/message boxes, Displays graphics/image

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 Details

This Ransomware does the following:

  • It displays the following window after encryption:

    • If "Okay!" button is clicked:
      • It will terminate itself
    • If "Im fucking faggot! PLEASE DELETE MY SYSTEM!" button is clicked:
      • It will display the following message boxes:

      • It will overwrite the first sector (200 bytes) of the MBR then force the machine to shutdown

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %Desktop%

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.)

It appends the following extension to the file name of the encrypted files:

  • .FilGZmsp

It leaves text files that serve as ransom notes containing the following text:

  • %Desktop%\!!ÊàêÐàñøèôðîâàòüÝòóÏàðàøó.txt

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.894.03
FIRST VSAPI PATTERN DATE: 25 Mar 2019
VSAPI OPR PATTERN File: 14.895.00
VSAPI OPR PATTERN Date: 26 Mar 2019

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %Desktop%\!!ÊàêÐàñøèôðîâàòüÝòóÏàðàøó.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SOBACHKA.THAAABAH. 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 the following Trend Micro Support pages for more information:

Step 5

Restore encrypted files from backup.


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