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Ransom.Win32.OUROBOROS.AE

May 16, 2020
 ALIASES:

a variant of Win32/Filecoder.Ouroboros.E trojan (NOD32)

 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

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.

  TECHNICAL DETAILS

File Size:

1,021,440 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 May 2020

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.

Installation

This Ransomware drops the following files:

  • %All Users Profile%\IDo.txt
  • %All Users Profile%\pubkey.txt

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit). )

It adds the following processes:

  • net stop SQLWriter
  • net stop SQLBrowser
  • net stop MSSQLSERVER
  • net stop MSSQL$CONTOSO1
  • net stop MSDTC
  • net stop SQLSERVERAGENT
  • net stop vds
  • bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • bcdedit /set {default} recoveryenabled no
  • wbadmin delete catalog -quiet
  • netsh advfirewall set currentprofile state off
  • netsh firewall set opmode mode=disable

Other Details

This Ransomware connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}l-dev.org/ip-provider.php

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .[stevenxx1{BLOCKED}@{BLOCKED}.com][ID-{Random characters}].Void

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

  • {Encrypted directory}\Decryption-Info.HTA

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.872.02

FIRST VSAPI PATTERN DATE:

16 May 2020

VSAPI OPR PATTERN File:

15.873.00

VSAPI OPR PATTERN Date:

17 May 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

Step 2

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 3

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 4

Search and delete this file

[ 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.
  • %All Users Profile%\IDo.txt
  • %All Users Profile%\pubkey.txt
  • {Encrypted directory}\Decryption-Info.HTA

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.OUROBOROS.AE. 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 6

Restore encrypted files from backup.


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