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    March 19, 2023
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    Rewterz Threat Advisory – CVE-2022-42436 – IBM MQ Vulnerability
    Severity Medium Analysis Summary CVE-2022-42436 IBM MQ Managed File Transfer could allow a local user to obtain sensitive information from diagnostic files. Impact Indicators Of Compromise […]
    March 19, 2023
    March 19, 2023
    Rewterz Threat Advisory – ICS: Rockwell Automation Modbus TCP AOI Server Vulnerability
    Severity Medium Analysis Summary CVE-2023-0027 Rockwell Automation Modbus TCP AOI Server could allow a remote attacker to obtain sensitive information. By sending a malformed message, an […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – ICS: Multiple Schneider Electric IGSS Vulnerabilities
    Severity High Analysis Summary CVE-2023-27984 CVSS:7.8 Schneider Electric IGSS could allow a remote attacker to execute arbitrary code on the system, caused by improper input validation […]

    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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    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 – Home and Small Office Wireless Routers Exploited to Attack Gaming Servers

November 1, 2019

Severity

Medium

Analysis Summary

 An updated Gafgyt variant is found attempting to infect IoT devices; specifically small office/home wireless routers of known commercial brands like Zyxel, Huawei, and Realtek. The variant uses remote code execution exploits to gain access and recruit routers into botnets to attack gaming servers – most notably those running the Valve Source engine – and cause a Denial of Service (DoS). This variant also competes against similar botnets, which are frequently sold on Instagram. According to Shodan scans, there are more than 32,000 WiFi routers potentially vulnerable to these exploits around the world. Following flaws are being exploited to drop this variant.

CVE-2017-18368 – ZYXEL P660HN-T1A 
CVE-2017-17215 – Huawei HG532 
CVE-2014-8361 – Realtek RTL81XX Chipset 

It uses three “scanners” that attempt to exploit known remote code execution vulnerabilities present on the routers mentioned above. These scanners replace the typical dictionary attack commonly found in other IoT botnets.

Figure-1.-Scanner-functions-found-in-the-sample-1024x109.png

The exploits were crafted to work as binary droppers, which pull the corresponding binary from a malicious server depending on the type of device it is trying to infect.

Once the malware is running on a compromised device, it connects to a C2 server, which is the same as the binary dropper server, and sends the device information to join the botnet. Once the device joins the botnet, it starts receiving commands to perform various types of DoS attacks.

Impact

  • Remote Code Execution
  • Unauthorized Access
  • Denial of Service

Affected Vendors

  • Zyxel
  • Huawei
  • Realtek

Affected Products

Wireless Routers

Indicators of Compromise

MD5

  • fb93601f8d4e0228276edff1c6fe635d
  • f1c099d65bf94e009f5e65238caac468

SH256

  • 04463cd1a961f7cd1b77fe6c9e9f5e18b34633f303949a0bb07282dedcd8e9dc
  • 676813ee73d382c08765a75204be8bab6bea730ff0073de10765091a8decdf07

SHA1

  • 5b0abd3c12611136fa9378ffc0c76d533cd3a385
  • b5fe93481949f81ba6b76e22be7165dfeb88a963

Source IP

185.172.110[.]224

URL

  • hxxp[:]//185[.]172[.]110[.]224/arm7
  • hxxp[:]//185.172.110[.]224[:]993/
  • hxxp[:]//185[.]172[.]110[.]224/mips

Remediation

  • Block the threat indicators at their respective controls.
  • Only use updated versions of wireless routers.

Platform

  • Rewterz XDR
  • Rewterz Defense
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Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
  • Onsite SOC
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Assess

  • Compromise Assessment
  • APT Assessment
  • Penetration Testing
  • Architecture Design & Review
  • Red Team Assessment
  • Purple Team Assessment
  • Social Engineering
  • Source Code Review

Transform

  • SOC Consultancy
  • SOC Maturity Assessment
  • SOC Model Evaluation
  • SOC Gap Analysis
  • SIEM Gap Analysis
  • SIEM Optimization
  • SOC Content Pack

Train

  • Simulated Cyber Attack Exercise
  • Tabletop Exercise
  • Security Awareness and Training

Respond

  • Incident Analysis
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Threat Insights

  • Threat Advisories
  • Monthly Threat Insights
  • Threat Intelligence Reports

Resources

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Connect With Us

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