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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 […]

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    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.

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Rewterz Threat Alert – MuddyWater Associated Blackwater Campaign New Anti Detection Techniques

May 23, 2019

Severity

High

Analysis Summary


A campaign recently discovered called “BlackWater” is associated with suspected persistent threat actor MuddyWater. In this campaign attackers have added distinct operations to remain undetected and bypass certain security restrictions as well which suggests that the threat group has evolved their tactics techniques and procedures (TTPs) to evade detection. If successful, this campaign would install a PowerShell-based backdoor onto the victim’s machine, giving the threat actors remote access.

In this latest activity, the threat actor first added an obfuscated Visual Basic for Applications (VBA) script to establish persistence as a registry key. Next, the script triggered a PowerShell stager, likely in an attempt to masquerade as a red-teaming tool rather than an advanced actor. The stager would then communicate with one actor-controlled server to obtain a component of the FruityC2 agent script, an open-source framework on GitHub, to further enumerate the host machine. This could allow the threat actor to monitor web logs and determine whether someone uninvolved in the campaign made a request to their server in an attempt to investigate the activity. Once the enumeration commands would run, the agent would communicate with a different C2 and send back the data in the URL field. This would make host-based detection more difficult, as an easily identifiable “errors.txt” file would not be generated.

A document which is likely to be associated with the muddywater campaign is delivered via phishing email and users are lured into clicking into that document which goes by the name of “company information list.doc”.

image1.png

Once the document was opened, it prompted the user to enable the macro titled “BlackWater.bas”. The threat actor password-protected the macro, making it inaccessible if a user attempted to view the macro in Visual Basic, likely as an anti-reversing technique. The “Blackwater.bas” macro was obfuscated using a substitution cipher whereby the characters are replaced with their corresponding integer.

image5.png

The macro contains a PowerShell script to persist in the “Run” registry key, “KCU\Software\Microsoft\Windows\CurrentVersion\Run\SystemTextEncoding”. The script then called the file “\ProgramData\SysTextEnc.ini” every 300 seconds. The clear text version of the SysTextEnc.ini appears to be a lightweight stager.

image2.png

Indicators of Compromise

URLs

  • http://136.243.87.112:3000/KLs6yUG5Df
  • http://136.243.87.112:3000/ll5JH6f4Bh
  • http://136.243.87.112:3000/Y3zP6ns7kG
  • http://38.132.99.167/crf.txt
  • http://82.102.8.101:80/bcerrxy.php?rCecms=BlackWater
  • http://82.102.8.101/bcerrxy.php
  • http://94.23.148.194/serverScript/clientFrontLine/
  • http://94.23.148.194/serverScript/clientFrontLine/getCommand.php
  • http://94.23.148.194/serverScript/clientFrontLine/helloServer.php

Filename

company information list.doc

Malware Hash (MD5/SHA1/SH256)

  • d4de6b8ffcd878359315594515dd33c0
  • 21aebece73549b3c4355a6060df410e9
  • 036f4400babdaa314ab5aa4a2c378e2f
  • cf3c731ca73ddec5d9cdd29c680c0f20
  • 0638adf8fb4095d60fbef190a759aa9e
  • 97bf0d6e11ee4118993ad9c4b959c916
  • eed599981c097944fa143e7d7f7e17b1
  • 5c6148619abb10bb3789dcfb32f759a6

Remediation

  • Block the threat indicators at their respective controls.
  • Never click on the links/ attachments sent by unknown senders.
  • Always verify about the emails sent by unverified/ unknown senders.

Platform

  • Rewterz XDR
  • Rewterz Defense
  • Rewterz Threat Intelligence

Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
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Assess

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  • Architecture Design & Review
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  • Social Engineering
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Transform

  • SOC Consultancy
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  • SIEM Gap Analysis
  • SIEM Optimization
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Train

  • Simulated Cyber Attack Exercise
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Respond

  • Incident Analysis
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Threat Insights

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Connect With Us

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