Analysis by: Rhena Inocencio
ALIASES:

Backdoor:Perl/Shellbot.AK (Microsoft), Perl/Shellbot (McAfee), Backdoor.Perl.Shellbot.B (BitDefender)

 PLATFORM:

Linux

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

  TECHNICAL DETAILS

File Size: 32,770 bytes
File Type: Script
Memory Resident: No
Initial Samples Received Date: 28 Aug 2014

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.

Other System Modifications

This Backdoor deletes the following files:

  • machine logs
      *.bash_history
    • *.bash_logout
    • *.log

Backdoor Routine

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

  • {BLOCKED}.{BLOCKED}.202.24:443

It executes the following commands from a remote malicious user:

  • UDP Flooding
  • SYN Flooding
  • HTTP Flooding
  • NTP flooding
  • Send spam mails

Other Details

This Backdoor uses the following credentials when accessing its IRC server:

  • Nick Linux|
  • User {random}
    where {random} can be any of the following:
    • dildos
    • invisible_man
    • dongs
    • titan
    • dongus
    • t
    • cocklover
    • hatter
    • lucifer
    • madhatter
    • dildo-feeder
    • marijuana
    • hacker
    • sex
    • paul
    • drugs
    • saul
    • rock-and-roll
    • jack
    • vaginal-insertion
    • jake
    • michael-jackson
    • dick
    • obama
    • dickus
    • krebs
    • cockus
    • brian-krebs
    • fuckus
    • krebs-the-god
    • fuckme
    • krebs-got-watted
    • anal
    • Abercombie
    • sex
    • wanker
    • faggot
    • fap
    • shclong
    • obesity
    • dick
    • meow
    • cock
    • cancer
    • vagina
    • dox
    • niggers
    • doxbin
    • blackperson
    • HTP
    • cock fondler
    • hack-the-planet
    • rapist
    • oven-dweller
    • child-molester
    • krebs-is-gay
    • pedophile
    • RIP-SilkRoad
    • codevade
    • RIP-TOR
    • zeekill
    • RIP-ANONYMITY
    • kms
    • RIP-HACKERS
    • kayla
    • DPR
    • starfall
    • DeadPirateRoberts
    • aurora
    • spongebob
    • sa7an
    • patrick
    • nachash
    • intercourse
    • xix
    • xali3n

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.114.06
FIRST VSAPI PATTERN DATE: 28 Aug 2014
VSAPI OPR PATTERN File: 11.115.00
VSAPI OPR PATTERN Date: 28 Aug 2014

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