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Backdoor.Python.MASEPIE.YEEAH

April 23, 2024
 Analysis by: Leidryn Saludez
 ALIASES:

Trojan.GenericKD.71015042 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • 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:

4,909 bytes

File Type:

PY

Memory Resident:

No

Initial Samples Received Date:

08 Jan 2024

Payload:

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.

Backdoor Routine

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

  • NICK → get the username
  • check → ensure connection with response "check-ok"
  • send_file → receive a file from the server
  • get_file → waits for the server to send the path of a file, encrypts its content, and sends it to the server.
  • Other Commands → any other command received from the server is treated as a shell command, output of the command is then sent back to the server.

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

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.8
    • Ports
      • 54763
      • 55555

Other Details

This Backdoor connects to the following possibly malicious URL:

  • https://{BLOCKED}nvpujmmjkfhhvsclx05sfi23bfr.oast.fun

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.928.08

FIRST VSAPI PATTERN DATE:

08 Jan 2024

VSAPI OPR PATTERN File:

18.929.00

VSAPI OPR PATTERN Date:

09 Jan 2024

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

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Python.MASEPIE.YEEAH. 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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