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Trojan.Win64.BIANLIAN.B.go

March 30, 2023
 Analysis by: Arianne Grace Dela Cruz
 ALIASES:

HEUR/AGEN.1318205 (ANTIVIR); a variant of Win64/Agent.RA trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


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

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

7,921,664 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

25 Mar 2023

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan 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 Trojan does the following:

  • It connects to the following URL to obtain its main module:
    • {BLOCKED}.{BLOCKED}.{BLOCKED}.39:443
  • Once connection is successful, it sends the following string and proceed with loading the main module
    • bEVnYZD9p93Z6OiTntVX7LKwqQc12q
  • It creates the following service:
    • Service Name = smbmonitoring
    • Display Name = SMB Monitoring
    • Binary Pathname = {malware path}\{malware filename}

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.346.08

FIRST VSAPI PATTERN DATE:

27 Mar 2023

VSAPI OPR PATTERN File:

18.347.00

VSAPI OPR PATTERN Date:

28 Mar 2023

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, and then delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\smbmonitoring

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win64.BIANLIAN.B.go. 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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