Analysis by: Henry Alarcon Jr.
ALIASES:

Trojan:MSIL/Bombres.A (Microsoft), Spyware.PasswordStealer (Malwarebytes), Backdoor.MSIL.Agent.aabs (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This malware connects to a specific post from a specific Twitter account. The image in the post hosts code that connects to a command and control server used by this malware to receive commands.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 21,504 bytes
File Type: EXE
Memory Resident: No
Payload: Connects to URLs/IPs, Steals information

Arrival Details

This Trojan may be dropped by the following malware:

Other Details

This Trojan does the following:

  • It downloads malicious memes from the Twitter account to the victim’s machine: https://twitter.com/{BLOCKED}mc
    • It then extracts the following given command hidden in the memes:
      • /print
        • Screen capture
      • /processos
        • Retrieve list of running processes
      • /clip Capture
        • Capture clipboard content
      • /username
        • Retrieve username from infected machine
      • /docs
        • Retrieve filenames/ credential from the following:
          • %Desktop%
          • %User Profile%\Documents
          • %User Profile%\Pictures
          • Internet login credentials such as Google Chrome
  • It connects to the following URL to obtain the control server information from Pastebin:
    https://pastebin.com/raw/{BLOCKED}J

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.652.05
FIRST VSAPI PATTERN DATE: 27 Nov 2018
VSAPI OPR PATTERN File: 14.653.00
VSAPI OPR PATTERN Date: 28 Nov 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 Trojan.MSIL.BERBOMTHUM.AA

[ 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.  
  • %User Startup%\Application Framework.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.MSIL.BERBOMTHUM.AA. 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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