Analysis by: Jeanne Jocson
ALIASES:

Backdoor:PHP/Hiebot.E(Microsoft), PHP/Pbot.A trojan(ESET), Backdoor.PHP.Pbot.g(Kaspersky), Troj/PHPBot-F(Sophos), Backdoor.PHP.Pbot(Ikarus)

 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

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.

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

  TECHNICAL DETAILS

File Size: 13,426 bytes
Memory Resident: No
Initial Samples Received Date: 11 Mar 2016

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.

Backdoor Routine

This backdoor connects to any of the following IRC server(s):

  • {BLOCKED}.{BLOCKED}.144.140:6667
  • {BLOCKED}.{BLOCKED}.146.114:6660

It joins any of the following IRC channel(s):

  • #puteri
  • #pbot

It executes the following commands from a remote malicious user:

  • sends an email
  • DNS lookup
  • Downloads a file
  • Executes Shell Command
  • Gets system information
  • Executes php code
  • TCP flood attack
  • UDPflood attack
  • Executes raw IRC command
  • Port scan
  • Reports the following information:
    • System's OS
    • Server Software
    • Host Name
    • Server Name

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.408.08
FIRST VSAPI PATTERN DATE: 17 Mar 2016
VSAPI OPR PATTERN File: 12.409.00
VSAPI OPR PATTERN Date: 18 Mar 2016

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_PBOT.SM. 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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