Analysis by: Byron Jon Gelera
 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Via physical/removable drives, Dropped by other malware, Downloaded from the Internet

This Worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any backdoor routine.

  TECHNICAL DETAILS

File Size: 606,208 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 08 Feb 2018
Payload: Connects to URLs/IPs, Steals information

Arrival Details

This Worm arrives via removable drives.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Propagation

This Worm drops the following copy(ies) of itself in all removable drives:

  • {removable drive letter}:\scr.exe

It creates shortcut files (.LNK) disguised as folders or files located on the affected drives pointing to the malware copy.

Backdoor Routine

This Worm does not have any backdoor routine.

Information Theft

This Worm gathers the following data:

  • User Name
  • Computer Name
  • IP Address
  • Operating System Platform
  • Operating Sysem Version
  • Processor Name
  • Amount of Physical Memory
  • Video Card Name
  • Video Card Memory
  • Screenshots
  • Username and Password from the following applications:
    • Chrome
    • Firefox
    • Opera
    • Yandex
    • Internet Explorer
    • Safari
    • Sea Monkey
    • Comodo
    • Flock
    • CoolNovo
    • Chromium
    • Outlook
    • Thunderbird
    • FoxMail
    • OperaMail
    • PocoMail
    • Eudora
    • The Bat!
    • FileZilla
    • WS_FTP
    • WinSCP 2
    • CoreFTP
    • DynDNS
    • FlashFXP
    • Paltalk
    • Pidgin
    • Smart FTP
    • FTP Commander
    • No-IP
    • Internet Download Manager
    • JDownloader

Stolen Information

This Worm sends the data it gathers to the following email addresses via SMTP:

  • mercylogs@{BLOCKED}o.com

Other Details

This Worm connects to the following URL(s) to get the affected system's IP address:

  • http://checkip.dyndns.org

It drops the following file(s)/component(s):

  • %Application Data%\ScreenShot\screen.jpeg ← screenshot

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It does the following:

  • It terminates itself if found running on Virtual Machines.
  • It checks for running processes of known debuggers and terminates itself once found.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.962.04
FIRST VSAPI PATTERN DATE: 12 Feb 2018
VSAPI OPR PATTERN File: 13.963.00
VSAPI OPR PATTERN Date: 13 Feb 2018

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

Identify and terminate files detected as WORM_GOLROTED.NZU

[ 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 4

Search and delete these files

[ 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.  
  • %Application Data%\ScreenShot\screen.jpeg
  • {removable drive letter}:\{original filename and extension of files in removable drive}.lnk

Step 5

Scan your computer with your Trend Micro product to delete files detected as WORM_GOLROTED.NZU. 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:


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