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    Rewterz Threat Alert -New Golang-Based Botnet GoBruteforcer Breaches Web Servers – Active IOCs
    Severity High Analysis Summary According to researchers, a Golang-based botnet named GoBruteforcer has been discovered, which is specifically targeting web servers running FTP, MySQL, phpMyAdmin, and […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Alert – DarkComet RAT (Remote Access Trojan) – Active IOCs
    Severity High Analysis Summary DarkComet RAT (Remote Administration Tool) is a type of malware that is designed to allow attackers to gain remote access to a […]
    March 15, 2023
    March 15, 2023
    Rewterz Threat Advisory -Multiple Microsoft Windows Products Vulnerabilties
    Severity High Analysis Summary CVE-2023-23410 CVSS:7.8 Microsoft Windows could allow a local authenticated attacker to gain elevated privileges on the system, caused by a flaw in […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

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    Our leadership team brings together years of knowledge and experience in cybersecurity to drive our company's mission and vision. Our team is passionate about delivering high-quality products and services, leading by example and assisting our clients in securing their organization’s environment.
    help

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    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Alert – Turla LightNeuron Backdoor Targeting Microsoft Exchange Mail Servers Using Steganography

May 9, 2019

Severity

High

Analysis Summary


A Turla backdoor targeted at Microsoft Exchange mail servers and controllable remotely via email attachments using steganography was discovered while used in attacks against multiple targets from around the world.

The specific targeting of Microsoft Exchange servers by malware is in itself unique, but even more interesting is the use of Transport Agents as a persistence mechanism. Transport Agents are used in a Microsoft Exchange mail flow to allow custom software to be involved in the processing of email messages. By creating a custom Transport Agent, the Turla threat group was able to apply a custom rule-set to emails passing through compromised Exchange servers allowing them to read, modify, compose, send, or delete emails. Using the rule file for the Transport Agent, the attackers implemented handlers that included the ability to execute commands. If an attacker sends an email to the victim organization with either a PDF or JPG attachment, a rule is applied that decodes commands that were hidden in the documents via steganography methods. The commands enable full control over the Exchange server via functions such as executing processes, exfiltrating files, and writing executables.

figure3-wm-1024x618.png

Impact

  • Remote code execution
  • Exfiltrate sensitive documents

Indicators of Compromise

Malware Hash (MD5/SHA1/SH256)

  • 3C851E239FBF67A03E0DAE8F63EEE702B330DB6C 
  • 76EE1802A6C920CBEB3A1053A4EC03C71B7E46F8 
  • FF28B53B55BC77A5B4626F9DB856E67AC598C787 
  • C1FF6804FDB8656AB08928D187837D28060A552F 
  • F9D52BB5A30B42FC2D1763BE586CEE8A57424732 
  • 0A9F10925AF42DF94925D07112F303D57392C908 
  • A4D1A34FE5EFFD90CCB6897679586DDC07FBC5CD 
  • 0a9f10925af42df94925d07112f303d57392c908 
  • 3c851e239fbf67a03e0dae8f63eee702b330db6c 
  • 76ee1802a6c920cbeb3a1053a4ec03c71b7e46f8 
  • a4d1a34fe5effd90ccb6897679586ddc07fbc5cd 
  • c1ff6804fdb8656ab08928d187837d28060a552f 
  • f9d52bb5a30b42fc2d1763be586cee8a57424732 
  • ff28b53b55bc77a5b4626f9db856e67ac598c787 

Affected Vendors

Microsoft

Affected Products

Remediation

Block all threat indicators at your respective controls.

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