Analysis by: Cris Nowell Pantanilla
ALIASES:

Backdoor.PHP.Pbot.g (Kaspersky), PHP.Backdoor.Trojan (Symantec)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Hosted on sites

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: 4617 bytes
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 21 Sep 2010
Payload: Executes commands, Connect to IRC

Arrival Details

This backdoor 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):

  • irc.{BLOCKED}ka.co.vu:6667

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

  • #berkah
  • #neraka

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

  • DNS lookup
  • Execute Shell Command
  • Execute PHP Code
  • Connect to remote sites
  • Executes IRC Commands:
    • join
    • send message
    • send private message
    • notice
    • nick
    • set random nick
    • quit

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 7.478.08
FIRST VSAPI PATTERN DATE: 21 Sep 2010
VSAPI OPR PATTERN File: 7.479.00
VSAPI OPR PATTERN Date: 22 Sep 2010

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.SMM. 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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