Trustwave SpiderLabs Exposes Unique Cybersecurity Threats in the Public Sector. Learn More

Trustwave SpiderLabs Exposes Unique Cybersecurity Threats in the Public Sector. Learn More

Services
Capture
Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

twi-managed-portal-color
Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

twi-briefcase-color-svg
Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

tw-laptop-data
Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

twi-database-color-svg
Database Security

Prevent unauthorized access and exceed compliance requirements.

twi-email-color-svg
Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

tw-officer
Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

tw-network
Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

Solutions
BY TOPIC
Offensive Security
Solutions to maximize your security ROI
Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
Awards and Accolades
Trustwave SpiderLabs Team
Trustwave Fusion Security Operations Platform
Trustwave Security Colony
Partners
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
SpiderLabs Blog

Java-based Malware Distributed Through Spam

For the past few months, we've observed more spam with Java-based malware attachments. The recent examples purport to be an invoice from a logistics company. The attachment is a .JAR file using a variety of filenames such as Authorized Invoice Cop.jar, Authorized Invoice.jar or Approved Invoice.jar.

BSL_12588_f0254438-c77a-493d-b1d0-ccc96a909498

The malware attachment is a Java application which requires a JRE (Java Runtime Environment) installed in the system in order for it to run. On the infected machine, the malware connects to a remote server with the domain name srv2.folgner.eu (IP address: 31.220.25.178 ) through port 1303. We have also noticed a few spam messages sent from the same server.

11116_a98b9a75-536d-4033-bd8a-7bfebed1cd83

The .JAR packaged malware was built from a Java-based toolkit named jRAT (Java Remote Access Tool). It is capable of remotely taking control of the infected system and can be customized to run on Windows, Mac, Linux, and well-known UNIX flavors such as FreeBSD, OpenBSD and Solaris.

9351_550d1c4d-fe6c-4314-bd53-066f8d38cbcd
 

The toolkit is well known in the underground hacking forums and often used for malicious purposes. According to its description it states: "jRAT is a revolutionary rat combining the uses of a remote tool and java to ensure the ability to adapt to multiple systems at once". It features a fully undetectable (FUD) crypter to bypass detection, remote webcam viewer, keylogger, remote file manager and remote desktop viewer/controller.

The toolkit's control panel shows more interesting features that a cybercriminal can remotely control and execute in the infected system.

BSL_12240_e146401d-43c4-4c34-932f-3921dd4fbf63

While RAT (remote access tool) software has legal uses such as by network administrators, it is also used for criminal and malicious purposes. Although, spam campaigns with Java-based malware attachments are not common, we advise users to be cautious when encountering .JAR file attachments. It is also recommended that email gateway policy should lock down executables like Java applications, especially in a corporate environment.

Trustwave's Secure Email Gateway customers were protected from this spam campaign without any additional action required.

Latest SpiderLabs Blogs

Important Security Defenses to Help Your CISO Sleep at Night

This is Part 13 in my ongoing project to cover 30 cybersecurity topics in 30 weekly blog posts. The full series can be found here.

Read More

2024 Public Sector Threat Landscape: Trustwave Threat Intelligence Briefing and Mitigation Strategies

Trustwave SpiderLabs’ 2024 Public Sector Threat Landscape: Trustwave Threat Intelligence Briefing and Mitigation Strategies report details the security issues facing public sector security teams as...

Read More

How to Create the Asset Inventory You Probably Don't Have

This is Part 12 in my ongoing project to cover 30 cybersecurity topics in 30 weekly blog posts. The full series can be found here.

Read More