Analysis by: Christopher Daniel So
 PLATFORM:

Linux, UNIX, Mac OS X

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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 connects to Internet Relay Chat (IRC) servers. It joins an Internet Relay Chat (IRC) channel. It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 216,166 bytes
File Type: Script
Memory Resident: Yes
Initial Samples Received Date: 29 Sep 2014
Payload: Compromises system security, Connects to URLs/IPs

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.

Backdoor Routine

This backdoor connects to any of the following Internet Relay Chat (IRC) servers:

  • {BLOCKED}.{BLOCKED}.240.38:1337

It joins any of the following Internet Relay Chat (IRC) channels:

  • #xrt

It executes the following commands from a remote malicious user:

  • !die - Terminate current process
  • !killall - Terminate all Perl processes
  • !reset - Reconnect to IRC server
  • !jo - Join a channel
  • !part - Leave a channel
  • !nick - Change nickname
  • !pid - Send fake process name and process ID
  • ! - Execute a shell command
  • !raw - Send raw IRC message
  • !say - Send private message
  • !act - Send an action command
  • !timot - Set timeout value used in performing HTTP GET
  • !matek - Terminate current process
  • !modarkabeh - Terminate all Perl processes
  • !reset - Reconnect to IRC server
  • !jo - Join a channel
  • !part - Leave a channel
  • .sh - Execute a shell command
  • {current nickname} - Execute a shell command
  • !Goox - Enable or disable usage of Google search engines
  • !engine - Enable or disable usage of non Google search engines
  • !pid - Send fake process name and process ID
  • !cari - Search for websites with accessible Magento database configuration file
  • !jnews - Search for websites that uses vulnerable jNews extensions
  • !jnews2 - Search for websites that uses vulnerable jNews extensions
  • !open - Search for websites using vulnerable OpenEMR
  • !civ - Search for websites using vulnerable CiviCRM
  • !civic - Search for websites using vulnerable CiviCRM
  • !letter - Search for websites that uses vulnerable jNews extensions
  • !letter2 - Search for websites that uses vulnerable jNews extensions
  • !tum - Search for websites using PBV MULTI VirtueMart theme with vulnerable TimThumb
  • !piwik - Search for websites using vulnerable Piwik
  • !slim - Search for websites using vulnerable Slimstat Ex
  • !seo - Search for websites using vulnerable SEO Watcher
  • !sql - Search for websites vulnerable to SQL injection
  • !civicrm - Search for websites using vulnerable CiviCRM
  • !acymailing - Search for websites using vulnerable AcyMailing
  • !acymailing2 - Search for websites using vulnerable AcyMailing
  • !jinc - Search for websites using vulnerable JINC
  • !jinc2 - Search for websites using vulnerable JINC
  • !maianmedia - Search for websites using vulnerable Maian Media
  • !maianmedia2 - Search for websites using vulnerable Maian Media
  • !joomleague - Search for websites using vulnerable JoomLeague
  • !joomleague2 - Search for websites using vulnerable JoomLeague
  • !woopra - Search for websites using vulnerable Woopra
  • !jce - Search for websites using vulnerable JCE
  • !gento - Search for websites using vulnerable Magento API
  • !zimbra - Search for websites using vulnerable Zimbra
  • !zim - Search for websites using vulnerable Zimbra
  • !shock - Search for websites with CVE-2014-6271 vulnerability and download and execute http://{BLOCKED}x.com/shock/cgi in the vulnerable sites
  • !wplfd - Search for websites vulnerable to directory traversal attacks

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.180.03
FIRST VSAPI PATTERN DATE: 29 Sep 2014

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PERL_SHELLBOT.DI. 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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