Backdoor.Linux.BPFDOOR.SMZAJE-B

March 25, 2025

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 Analysis by: John Rainier Navato

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 ALIASES:

Trojan.Linux.Bpfdoor (IKARUS)

 PLATFORM:

Windows

 OVERALL RISK RATING:

 DAMAGE POTENTIAL:

 DISTRIBUTION POTENTIAL:

 REPORTED INFECTION:

 INFORMATION EXPOSURE:

• 
  Threat Type: Backdoor
• 
  Destructiveness: No
• 
  Encrypted:
• 
  In the wild: Yes

  TECHNICAL DETAILS

File Size:

23,488 bytes

File Type:

ELF

Initial Samples Received Date:

24 Mar 2025

Payload:

Drops files, Deletes files

Installation

This Backdoor drops the following files:

• /dev/shm/kdevtmpfls
• /var/run/kdevrund.pid

It adds the following processes:

• /bin/sh -c /bin/rm -f /dev/shm/kdevtmpfls;/bin/cp ./{Malware File Name} /dev/shm/kdevtmpfls && /bin/chmod 755 /dev/shm/kdevtmpfls && /dev/shm/kdevtmp
• /dev/shm/kdevtmpfls --init
• /bin/rm -f /dev/shm/kdevtmpfls

Other System Modifications

This Backdoor deletes the following files:

• /dev/shm/kdevtmpfls

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.928.08

FIRST VSAPI PATTERN DATE:

27 Feb 2025

VSAPI OPR PATTERN File:

19.929.00

VSAPI OPR PATTERN Date:

28 Feb 2025

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.BPFDOOR.SMZAJE-B. 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:

• Home and Home Office Support
• Business Support

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