RANSOM_MRCYBER.A

February 27, 2018
 Analysis by: Michael Jhon Ofiaza
 ALIASES:

Mal/MrCyber-A (Sophos-Lite) ; Trojan-Ransom.Win32.Gen.gdl (Kaspersky) ; Ransom.CryptXXX (Norton)

 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.

It encrypts files with specific file extensions.

  TECHNICAL DETAILS

File Size:

16,384 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Dec 2017

Payload:

Displays windows, Encrypts files

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:

  • Must be run as administrator to proceed to its encryption routine.
  • Encrypts files found in the following folder in Drive C:
    • %Program Files%
    • %Desktop%\
    • %User Profile%\Documents
    • %User Profile%\Pictures
  • Encrypts files in all drives except C:\

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

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .csv
  • .dll
  • .doc
  • .docx
  • .exe
  • .jpeg
  • .jpg
  • .pdf
  • .php
  • .rar
  • .sql
  • .txt
  • .zip

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

  • .mrcyber

NOTES:

This ransomware displays the following message box before encryption:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.822.06

FIRST VSAPI PATTERN DATE:

04 Dec 2017

VSAPI OPR PATTERN File:

13.823.00

VSAPI OPR PATTERN Date:

05 Dec 2017

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

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

Step 4

Restore encrypted files from backup.


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