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WORM_GAMARUE.YYJC

May 30, 2017
 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 may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

8,428,672 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

08 Apr 2016

Payload:

Connects to URLs/IPs, Downloads files

Arrival Details

This Worm may be dropped by the following malware:

  • TROJ_LODBAK.BA

Download Routine

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

  • http://ww1.{BLOCKED}a3my.ru:443

It saves the files it downloads using the following names:

  • %User Temp%\New{random numbers}.tmp -> detected as BKDR_ANDROM.SMXL3

(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 propagates by dropping the following components in removable drives:

  • %Removable Drive%\desktop.ini
  • %Removable Drive%\IndexerVolumeGuid
  • %Removable Drive%\System Volume Information\IndexerVolumeGuid
  • %Removable Drive%\System Volume Information\WPSettings.dat
  • %Removable Drive%\{Drive Name}{Drive Size}GB.lnk -> also detected as WORM_GAMARUE.YYJC, this will execute the DLL file

It copies all the user's folders and files in the removable drive into a hidden folder with a blank name.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.430.07

FIRST VSAPI PATTERN DATE:

26 May 2017

VSAPI OPR PATTERN File:

13.431.00

VSAPI OPR PATTERN Date:

27 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

Remove the malware/grayware file dropped/downloaded by WORM_GAMARUE.YYJC. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • TROJ_LODBAK.BA

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.  
  • %User Temp%\New{random numbers}.tmp

Step 5

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