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Threat Encyclopedia

JAVA_JACKSBOT.A

ANALYSIS BY

Mark Joseph Manahan


ALIASES:

Java/Jacksbot.A trojan (Eset), Java.Jacksbot, Java.Jacksbot (Ikarus)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003, Windows 7, Mac , Linux

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

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


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 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. It connects to a website to send and receive information.

TECHNICAL DETAILS

File Size:

53,038 bytes

File Type:

JAR

Memory Resident:

Yes

Initial Samples Received Date:

17 Oct 2012

Payload:

Connects to URLs/IPs, Compromises system security

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

  • Capture Screenshot
  • Visit Remote URLs
  • Manage files and directories
  • Download arbitrary files
  • Execute files
  • Upload files
  • Update and uninstall itself
  • Manage Processes
  • Upload file
  • Perform shell command
  • Perform Denial of Service attacks
  • Displays Messagebox
  • Shutdown, lock, sleep, logout & restart computer
  • Get Hardware/ System Informations
  • Record Audio
  • List Installed Applications
  • Steals User Informations (Minecraft)
  • Log keystrokes and mouse strokes
  • Get Network Information

It connects to the following websites to send and receive information:

  • jacksbotlist.{BLOCKED}p.info:1336

NOTES:

This backdoor checks the operating system (OS) used. Depending on the OS version, this backdoor does the following to enable its automatic execution at every system startup:

For Windows:

It adds the following registry entry:

HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Run
Microsoft® Windows® Operating System = "{Java Root Directory}\bin\javaw.exe -jar "{Malware Path and File name}""

For Mac:

It adds the following command in /etc/rc.local file:

  • java -jar "{Malware Path and File name}"

For Linux:

It adds the following command in /etc/rc.common file:

  • java -jar "{Malware Path and File name}"

Based on the analysis of the code, this malware still can add more capabilities by adding commands in "plugins.dat".

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.468.04

FIRST VSAPI PATTERN DATE:

18 Oct 2012

VSAPI OPR PATTERN File:

9.469.00

VSAPI OPR PATTERN Date:

19 Oct 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.


  • In HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Run
    • Microsoft® Windows® Operating System = "{Java Root Directory}\bin\javaw.exe -jar "{Malware Path and Filename}""

Step 4

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