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Ransom.Linux.EXX.YAAK-A

November 11, 2020
 Analysis by: Joshua John Bantayan
 ALIASES:

HEUR:Trojan-Ransom.Linux.Agent.g (KASPERSKY)

 PLATFORM:

Linux

 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

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 drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size:

212,264 bytes

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

06 Nov 2020

Payload:

Displays message/message boxes, 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:

  • It encrypts all files

Ransomware Routine

This Ransomware avoids encrypting files with the following strings in their file name:

  • !NEWS_FOR_{Victim's Name}!.txt
  • .{Victim's Name}

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

  • .{Victim's Name}

It drops the following file(s) as ransom note:

  • /{Encrypted Directory}/!NEWS_FOR_{Victim's Name})!.txt

It avoids encrypting files with the following file extensions:

  • .{Victim's Name}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.344.02

FIRST VSAPI PATTERN DATE:

11 Nov 2020

VSAPI OPR PATTERN File:

16.345.00

VSAPI OPR PATTERN Date:

12 Nov 2020

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.EXX.YAAK-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:


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