Analysis by: Bren Matthew Ebriega
ALIASES:

Trojan.BazarLoader (IKARUS); BScope.Trojan.Downloader(VBA32)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

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

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 154,624 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 11 Sep 2020
Payload: Connects to URLs/IPs, Steals information

Arrival Details

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

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Manage Files (Create, Delete, Modify, List, Copy, Move)
  • Manage Directory (Create, Set path)
  • Manage Processes (Open, Terminate, Create, List, Obtain Info, Adjust Permission)
  • Inject Code to Processes
  • Connect to a named pipe
  • Read/Modify file time
  • List Drive Information
  • Manage Services (Create, Delete, Start)
  • Impersonate Tokens
  • Enumerate Registries

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • https://nm.{BLOCKED}eswork.net/get
  • https://mn.{BLOCKED}eswork.net/RELEASES
  • https://tt.{BLOCKED}eswork.net/get

Download Routine

This Backdoor connects to the following URL(s) to download its component file(s):

  • https://{BLOCKED}eswork.net/components/dhl.mp3 → is reflectively loaded in its memory.

Information Theft

This Backdoor gathers the following data:

  • User Name
  • Computer Name
  • Host Name
  • Local IP Address
  • OS Version and Architecture
  • Current Process ID

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 16.232.09
FIRST VSAPI PATTERN DATE: 18 Sep 2020
VSAPI OPR PATTERN File: 16.233.00
VSAPI OPR PATTERN Date: 19 Sep 2020

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Restart in Safe Mode

[ Learn More ]

Step 4

Identify and terminate files detected as Backdoor.Win32.BAZAR.AB

[ 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 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win32.BAZAR.AB. 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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