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Backdoor.Win32.ALLIHOJ.A

December 16, 2022
 Analysis by: Jayvee Mark Villaroman
 ALIASES:

HEUR/AGEN.1219571 (ANTIVIR)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • 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.

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

  TECHNICAL DETAILS

File Size:

34,816 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Dec 2022

Payload:

Drops files, Steals information, Connects to URLs/IPs

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.

Installation

This Backdoor drops the following files:

  • {Malware path}\Driver.inf

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • 1SFUbVByb3h5iS3h

Backdoor Routine

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

  • https://www.{BLOCKED}a.com/

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

Information Theft

This Backdoor gathers the following data:

  • Host name
  • IP addresses
  • Drive information
  • System time & date

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.130.05

FIRST VSAPI PATTERN DATE:

13 Dec 2022

VSAPI OPR PATTERN File:

18.131.00

VSAPI OPR PATTERN Date:

14 Dec 2022

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

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.  
  • {Malware path}\Driver.inf

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.ALLIHOJ.A. 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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