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ZLULBOT

January 22, 2016
 ALIASES:

Lukicsel, MSIL.IrcBot, Sdbot, Zombie, MSIL

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


ZLULBOT, also known as ZOMBIE, is a bot client used to conduct distributed denial of service (DDoS) attacks against several Brazil-based websites in 2011. It joins a specific Internet Relay Chat (IRC) server where it receives a set of commands to perform on affected computers.

  TECHNICAL DETAILS

Memory Resident:

Yes

Payload:

Connects to URLs/IPs

Installation

This backdoor drops the following copies of itself into the affected system:

  • %System%\svchosta.exe
  • %System%\svchoste.exe
  • %System%\svchosth.exe
  • %System%\svchostzx.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svchostn.exe = ""%System%\{malware file name}" start4dalife"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svchostn.exe = ""%System%\{malware name}" start4alife""

Other Details

This backdoor connects to the following possibly malicious URL:

  • irc.{BLOCKED}ps.li
  • irc.{BLOCKED}nime.net

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