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Ransom.Win32.OUROBOROS.AB

November 04, 2019
 ALIASES:

Trojan-Ransom.Win32.Crypren.afte (Kaspersky); Trojan-Ransom.Ouroboros (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:

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:

873,472 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

01 Oct 2019

Payload:

Connects to URLs/IPs, 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.

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • SQLWriter
  • SQLBrowser
  • MSSQLSERVER
  • MSSQL$CONTOSO1
  • MSDTC
  • SQLSERVERAGENT
  • MSSQLSERVER
  • SQLSERVERAGENT
  • MySQL

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

  • sqlserver.exe
  • msftesql.exe
  • sqlagent.exe
  • sqlbrowser.exe
  • sqlwriter.exe
  • mysqld.exe
  • mysqld-nt.exe
  • mysqld-opt.exe

Other Details

This Ransomware connects to the following URL(s) to get the affected system's IP address:

  • www.{BLOCKED}ev.org/ip-provider.php

It does the following:

  • It deletes all shadow copies using the following command:
    • vssadmin delete shadows /all
  • It encrypts files in fixed, removable, and network drives.
  • It avoids encrypting files with the following extension:
    • .exe

Ransomware Routine

This Ransomware renames encrypted files using the following names:

  • {file name}.{file extension}.Email=[BLOCKEDSupport@cock.li]ID=[{15 random characters}].KRONOS

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

  • {Encrypted Directory}\HowToDecrypt.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.402.07

FIRST VSAPI PATTERN DATE:

01 Oct 2019

VSAPI OPR PATTERN File:

15.403.00

VSAPI OPR PATTERN Date:

02 Oct 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.  
  • {Encrypted Directory}\HowToDecrypt.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.OUROBOROS.AB. 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

Enabling Volume Shadow Service

  1. Run the command prompt (cmd.exe) as administrator.
  2. Enable Volume Shadow Service by typing the following command:
    net start vss

Step 6

Restore encrypted files from backup.


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