Analysis by: Julie Anne Cabuhat
ALIASES:

Ransom:Win32/Genasom (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This malware,discovered late December 2016, has been found to be connecting to a bitcoin transaction site as part of its malicious routines. Users affected by this malware may find their critical documents and files encrypted, which may cause data loss.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

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: 593,408 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 01 Mar 2017
Payload: Encrypts files, Renames files, Connects to URLs/IPs,

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.

Other Details

This Trojan renames encrypted files using the following names:

  • {file name}.{file extension}.edgel

It does the following:

  • It connects to the following url: http://btc.{BLOCKED}r.io/api/v1/address/info/{generated key} which is a bitcoin transaction site using the generated key as the transaction hash.

NOTES:

The ransomware encrypts files located in the following locations:

  • %Desktop%
  • %Windows%
  • %User Profile%\Documents

    • The ransomware displays the following message box as its ransom note after it is finished encrypting the files:

      SOLUTION

    Minimum Scan Engine: 9.800
    FIRST VSAPI PATTERN FILE: 13.132.02
    FIRST VSAPI PATTERN DATE: 31 Dec 2016
    VSAPI OPR PATTERN File: 13.133.00
    VSAPI OPR PATTERN Date: 01 Jan 2017

    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

    Identify and terminate files detected as RANSOM_EDGELOCKER.A

    [ Learn More ]
    1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
    2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
    3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

    Step 3

    Scan your computer with your Trend Micro product to delete files detected as RANSOM_EDGELOCKER.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 the following Trend Micro Support pages for more information:

    Step 4

    Restore encrypted files from backup.


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