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    Rewterz Threat Advisory – Office 365 Phishing Uses Image Inversion to Bypass Detection

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    March 15, 2023
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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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    Rewterz Threat Advisory – Office 365 Phishing Uses Image Inversion to Bypass Detection

    Managed Security Services

    • Managed Security Monitoring
    • Remote SOC
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    • Hybrid SOC

    Managed Penetration Testing

    Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.

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    • APT Assessment
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    March 15, 2023
    March 15, 2023
    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

    play_btn_Smallplay_btn_hover_Small
    leadership

    Our Leadership

    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

    CSR

    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.

    Connect with Us

    • Contact
    • Careers
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Rewterz
Rewterz Threat Alert – Emotet – IOCs
November 9, 2020
Rewterz
Rewterz Threat Advisory – CVE-2020-4759 – Multiple IBM Security Vulnerabilities
November 10, 2020

Rewterz Threat Advisory – Office 365 Phishing Uses Image Inversion to Bypass Detection

November 9, 2020

Severity

Medium

Analysis Summary

Researchers have recently discovered a novel way some threat actors are tricking these scanning engines, and this bot avoidance mechanism in particular has been deployed on multiple Office 365 credential phishing websites. Image recognition software is improving and becoming more accurate, this new technique aims to deceive scanning engines by inverting the colors of the image, causing the image hash to differ from the original. This technique can hinder the software’s ability to flag this image altogether.

Deployed

However, a victim visiting the website would likely recognize that the inverted picture is illegitimate and exit the website. As a result, the threat actor has stored the inverted image and, within the index.php code, has used a CSS method to revert the color of the image to its original state.

carbon-1

Impact

  • Credential theft
  • Exposure of sensitive data

Indicators of Compromise

MD5

  • 6c1b3b26914248fce7bf933de10050dd
  • 62ddd263c8a6a4c9074e205b91182d04

SHA-256

  • d9288957bd276f9144e1fe321e598b8bab81af20fd36db702d716664a6f7c65d
  • 7c10fa25b9ebad3a8d71a19bb2a7a0664df3415a2bfae566aa91beb11ae07b89
  • a59ea699d353d00ff2999111f9fa11fb73a47eda7800642609ca230560ea3703

SHA1

  • 7f81e7b6b10bd995f687aeb10f1735a7a2376307
  • 1b56d11b012dd79dd99212ebb54adcfb60920a9d

Remediation

  • Block all threat indicators at your respective controls.
  • Always be suspicious about emails sent by unknown senders.
  • Never click on links/attachments sent by unknown senders.

Platform

  • Rewterz XDR
  • Rewterz Defense
  • Rewterz Threat Intelligence

Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
  • Onsite SOC
  • Hybrid SOC

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
  • Incident Response

Threat Insights

  • Threat Advisories
  • Monthly Threat Insights
  • Threat Intelligence Reports

Resources

  • Blog
  • Press Releases

Connect With Us

  • Contact
  • Careers
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