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RANSOM_SEOIRSE.A

January 06, 2017
 Analysis by: Marvelous Pelin
 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, Dropped by other malware

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:

40,448 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Dec 2016

Payload:

Connects to URLs/IPs, Encrypts files, Displays message/message boxes, Collects system information

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.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.0.1/add.php

Information Theft

This Trojan gathers the following data:

  • OS Name
  • OS Version
  • OS Manufacturer
  • Computer Name
  • System Type
  • Total Physical Memory
  • Windows Directory

Other Details

This Trojan displays the following message boxes:


It encrypts files with the following extensions:

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

It renames encrypted files using the following names:

  • {original filename and extension}.seoirse

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

13.124.04

FIRST VSAPI PATTERN DATE:

29 Dec 2016

VSAPI OPR PATTERN File:

13.125.00

VSAPI OPR PATTERN Date:

30 Dec 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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_SEOIRSE.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

Restore encrypted files from backup.

Step 5

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


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