Analysis by: Joselyn Canuela
ALIASES:

Worm:Win32/Gamarue!rfn (Microsoft), Gamarue-FHU!777F3421BF90 (McAfee),

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This Worm 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: 6,689,792 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 30 Jun 2017

Arrival Details

This Worm 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 Worm requires the following additional components to properly run:

  • %Malware Path%\IndexerVolumeGUID
  • %User Temp%\NPaBsSKTToDACSh
  • %Malware Path%\desktop.ini

(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.)

NOTES:
It consists of the following export calls:

  • PiuGdpBNkwIUrDPj
  • cqxmixjgflgo
  • hjtvyefwgwm
  • mbzkuiafaul
  • nbumuxzjplbsk
  • uomqmyikkevirdlb
  • xfhcesoyfiblhyf
  • yqqfoejpudotgxgd
  • zjmkeztkowwcuvwj

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.526.02
FIRST VSAPI PATTERN DATE: 11 Jul 2017
VSAPI OPR PATTERN File: 13.527.00
VSAPI OPR PATTERN Date: 12 Jul 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 WORM_GAMARUE.YYPZ. 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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