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PHP_CSHELL.SMO4

April 28, 2015
 ALIASES:

Backdoor:PHP/C99shell.F (Microsoft), PHP.Backdoor.Trojan (Symantec), Backdoor.PHP.C99Shell.ff (Kaspersky)

 PLATFORM:

Windows, Linux/Unix

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

30 Oct 2010

Payload:

Compromises system security, Downloads files

Arrival Details

This backdoor may be dropped by other malware.

Backdoor Routine

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

  • change file permissions
  • copy a directory
  • copy file
  • delete file
  • download a file
  • dump the contents of a MySQL database
  • execute PHP code
  • execute a shell command
  • list all running processes
  • list directory contents
  • move a directory
  • query from a MySQL database
  • remove a directory
  • search a file
  • send an email
  • upload a file

Download Routine

This backdoor downloads an updated copy of itself from the following website(s):

  • http://{BLOCKED}o.ru/config/fx29sh_update.php
  • http://{BLOCKED}ef.ru/config/fx29sh_update.php
  • http://{BLOCKED}ef.ru/cyberz/fx29sh_update.php
  • http://{BLOCKED}l.com/fx29sh_update.php

NOTES:
The backdoor commands are specified in the parameters of this PHP script.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.584.08

FIRST VSAPI PATTERN DATE:

31 Oct 2011

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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 PHP_CSHELL.SMO4. 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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