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ELF_EMECH.SM

October 11, 2014
 ALIASES:

Linux/Meche.A (ESET), Backdoor.IRC.Bot (Symantec)

 PLATFORM:

Linux, Unix

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

  TECHNICAL DETAILS

File Size:

Varies

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

10 Oct 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 IRC server(s):

  • {BLOCKED}.{BLOCKED}.182.255
  • {BLOCKED}.{BLOCKED}.182.1
  • {BLOCKED}.{BLOCKED}.74.10
  • {BLOCKED}.{BLOCKED}.175.201
  • {BLOCKED}.{BLOCKED}.91.146
  • {BLOCKED}.{BLOCKED}.201.28

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

  • #netsplit

It executes the following commands from a remote malicious user:

  • cmd - send command to linked bots
  • nick - change nickname
  • join - join a channel
  • invite - invite user to a channel
  • ping - send ping
  • ctcp - send ctcp request to user
  • privmsg - send private message
  • away - set the bot away
  • kick - kick a user
  • ban - ban a user
  • banlist - show banlist
  • chaccess - change the level to do a command
  • deop - deop a user matching the given mask on a channel
  • die - kill the bot
  • do - send raw commands
  • debug - debug information to a file
  • cycle - quickly part and rejoin a channel
  • del - delete user from bots userlist

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.202.04

FIRST VSAPI PATTERN DATE:

10 Oct 2014

VSAPI OPR PATTERN File:

11.203.00

VSAPI OPR PATTERN Date:

11 Oct 2014

Scan your computer with your Trend Micro product to delete files detected as ELF_EMECH.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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