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RANSOM_GOMME.A

September 28, 2017
 Analysis by: Rheniel Rhay Ramos
 ALIASES:

Ransom.Gomme (Kaspersky); Artemis!CB24B3C80951 (McAfee); Mal/Gommran-A (Sophos)

 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 connects to certain websites to send and receive information.

It encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size:

10,240 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 May 2017

Payload:

Connects to URLs/IPs, Encrypts files

Other Details

This Ransomware connects to the following website to send and receive information:

  • http://{BLOCKED}tti.pro/gommeransom/btc.txt
  • http://{BLOCKED}tti.pro/gommeransom/1231.php?1={Personal Key}

It does the following:

  • It downloads the TORBrowser and saves it using the following file name if it doesn't exist in the %Desktop%:
    • C:/Users/Admoooon/Desktop/TORBrowser.exe
  • It uses the following URL to download the TORBrowser:
    • https://www.torproject.org/dist/torbrowser/6.5.2/torbrowser-install-6.5.2_en-US.exe

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %Desktop%\ransomtest

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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 avoids encrypting files with the following strings in their file name:

  • gommemode

It appends the following extension to the file name of the encrypted files:

  • .gommemode

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.440.01

FIRST VSAPI PATTERN DATE:

30 May 2017

VSAPI OPR PATTERN File:

13.441.00

VSAPI OPR PATTERN Date:

31 May 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

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_GOMME.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.


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