Analysis by: Al Victor de Leon
ALIASES:

Backdoor:PHP/SimpleShell.A (Microsoft), PHP/Agent.NDP trojan (Eset), PHP/Rst.CO!tr.bdr (Fortinet)

 PLATFORM:

Linux/UNIX

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be hosted on a website and run when a user accesses the said website.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size: 74,443 bytes
File Type: Script
Memory Resident: Yes
Initial Samples Received Date: 04 Jul 2014
Payload: Compromises system security

Arrival Details

This backdoor may be hosted on a website and run when a user accesses the said website.

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

  • Computer name
  • IP address of the affected machine
  • Server port number
  • Server password

NOTES:

This malware runs on PHP web server.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.902.02
FIRST VSAPI PATTERN DATE: 04 Jul 2014

Scan your computer with your Trend Micro product to delete files detected as PHP_WEBSHELL.VTL 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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