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RANSOM_HCSIX.C

January 12, 2018
 Analysis by: Johnlery Triunfante
 ALIASES:

Generic.Ransom.PyCL.A.E022F231 (BitDefender); W32/Ransom.EUD!tr (Fortinet)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • 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 is capable of encrypting files in the affected system.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

3,522,475 bytes

Memory Resident:

No

Initial Samples Received Date:

10 Jan 2018

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:

  • %User Temp%\_MEI{Random numbers}\win32api.pyd
  • %User Temp%\_MEI{Random numbers}\Crypto.Cipher._AES.pyd
  • %User Temp%\_MEI{Random numbers}\Crypto.Hash._SHA256.pyd
  • %User Temp%\_MEI{Random numbers}\Microsoft.VC90.CRT.manifest
  • %User Temp%\_MEI{Random numbers}\_hashlib.pyd
  • %User Temp%\_MEI{Random numbers}\bz2.pyd
  • %User Temp%\_MEI{Random numbers}\msvcm90.dll
  • %User Temp%\_MEI{Random numbers}\msvcp90.dll
  • %User Temp%\_MEI{Random numbers}\msvcr90.dll
  • %User Temp%\_MEI{Random numbers}\python27.dll
  • %User Temp%\_MEI{Random numbers}\pywintypes27.dll
  • %User Temp%\_MEI{Random numbers}\quiltersvc.exe.manifest
  • %User Temp%\_MEI{Random numbers}\select.pyd
  • %User Temp%\_MEI{Random numbers}\unicodedata.pyd
  • %User Temp%\_MEI{Random numbers}\win32api.pyd

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It creates the following folders:

  • %User Temp%\_MEI{Random numbers}

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Ransomware is capable of encrypting files in the affected system.

Ransomware Routine

This Ransomware drops the following file(s) as ransom note:

  • {File directory}\RECOVER.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.898.05

FIRST VSAPI PATTERN DATE:

11 Jan 2018

VSAPI OPR PATTERN File:

13.899.00

VSAPI OPR PATTERN Date:

12 Jan 2018

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

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\_MEI{Random numbers}

Step 4

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.  
  • {File directory}\RECOVER.txt

Step 5

Scan your computer with your Trend Micro product to delete files detected as RANSOM_HCSIX.C. 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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