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PHP_SIMPLESHELL.F

December 11, 2015
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Backdoor:PHP/SimpleShell.A (Microsoft), PHP.Backdoor.Trojan (Symantec), Troj/PHPShl-AK (Sophos)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

  TECHNICAL DETAILS

File Size:

1,607 bytes

File Type:

Other

Initial Samples Received Date:

03 Aug 2015

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.

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

Installation

This backdoor drops the following files:

  • {PHP Server Document Root}\plugins\user\go.php
  • {PHP Server Document Root}\images\stories\go.php
  • {PHP Server Document Root}\cache\go.log

It drops the following copies of itself into the affected system:

  • {PHP Server Document Root}\plugins\user\explore.php
  • {PHP Server Document Root}\plugins\user\crimeirc.php
  • {PHP Server Document Root}\wp-includes\wp-info.php

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}mu.co.kr/bbs//data/lol.txt
  • http://www.{BLOCKED}et.ru/includes/js/calendar/lang/go.log