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Backdoor.PHP.C99SHELL.0NA103DL24

April 30, 2024
 Analysis by: Raymart Christian Yambot
 ALIASES:

PHP:Agent-AD [Trj] (AVAST)

 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.

  TECHNICAL DETAILS

File Size:

306,167 bytes

File Type:

PHP

Memory Resident:

No

Initial Samples Received Date:

25 Apr 2024

Payload:

Creates files, Connects to URLs/IPs, Downloads files, Uploads files

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.

Other Details

This Backdoor does the following:

  • List files and folders
  • View file and folder information
  • Create a file
  • View a file
  • Provide user full access to files and folders
  • Execute a shell commands
  • Upload/Download a file to/from the web server
  • View list of processes running on the system
  • Manage SQL databases

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.300.08

FIRST VSAPI PATTERN DATE:

25 Apr 2024

VSAPI OPR PATTERN File:

19.301.00

VSAPI OPR PATTERN Date:

26 Apr 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.PHP.C99SHELL.0NA103DL24. 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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