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RANSOM_SANCTEAR.A

August 23, 2016
 Analysis by: Jeanne Jocson
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Trojan 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:

15,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Jul 2016

Payload:

Connects to URLs/IPs, Encrypts files, Displays message/message boxes

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Dropping Routine

This Trojan drops the following files:

  • {folders containing encrypted files}\DECRYPT_FILES.HTML - Serves as ransom note

Other Details

This Trojan encrypts files with the following extensions:

  • .txt
  • .pdf
  • .doc
  • .tif
  • .adi
  • .adt
  • .docx
  • .altr
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .odt
  • .jpg
  • .png
  • .csv
  • .sql
  • sln
  • .php
  • .asp
  • .aspx
  • .html
  • .xml
  • .psd

It renames encrypted files using the following names:

  • {filename of encrypted file}.crashed

NOTES:

This ransomware also has the following capabilities, which have not been used upon its execution:

  • Request data via HTTP GET from http://{BLOCKED}a.ru/write.php?exten=yes
  • Sends the gathered GUID via HTTP POST to URL http://{BLOCKED}a.ru/write.php:

The dropped ransome note DECRYPT_FILES.HTML contains the following message:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.664.05

FIRST VSAPI PATTERN DATE:

20 Jul 2016

VSAPI OPR PATTERN File:

12.665.00

VSAPI OPR PATTERN Date:

21 Jul 2016

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_SANCTEAR.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 this Knowledge Base page for more information.

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.  
  • {folders containing encrypted files}\DECRYPT_FILES.HTML

Step 5

Restore encrypted files from backup.


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