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    Rewterz Threat Alert – Dharma Ransomware Uses Legit Antivirus Tool to Distract Victims During Encryption

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    March 17, 2023
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    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
    Severity High Analysis Summary Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET […]
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    March 17, 2023
    Rewterz Threat Advisory – Multiple Adobe ColdFusion Vulnerabilities
    Severity High Analysis Summary CVE-2023-26361 CVSS:4.9 Adobe ColdFusion could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially […]
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    March 17, 2023
    Rewterz Threat Alert – Ursnif Banking Trojan aka Gozi – Active IOCs
    Severity Medium Analysis Summary Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 […]

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    • Rewterz XDR
    • Rewterz Defense
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    Rewterz Threat Alert – Dharma Ransomware Uses Legit Antivirus Tool to Distract Victims During Encryption

    Managed Security Services

    • Managed Security Monitoring
    • Remote SOC
    • Onsite SOC
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    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.

  • Services

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    • Compromise Assessment
    • APT Assessment
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    • Source Code Review

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    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
    Severity High Analysis Summary Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – Multiple Adobe ColdFusion Vulnerabilities
    Severity High Analysis Summary CVE-2023-26361 CVSS:4.9 Adobe ColdFusion could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Ursnif Banking Trojan aka Gozi – Active IOCs
    Severity Medium Analysis Summary Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 […]

    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

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Rewterz
Rewterz Threat Alert – Turla LightNeuron Backdoor Targeting Microsoft Exchange Mail Servers Using Steganography
May 9, 2019
Rewterz
Rewterz Threat Alert – New ELECTRICFISH Tool by HIDDEN COBRA
May 10, 2019

Rewterz Threat Alert – Dharma Ransomware Uses Legit Antivirus Tool to Distract Victims During Encryption

May 9, 2019

Severity

Medium

Analysis Summary


New Dharma ransomware strain uses the ESET AV Remover installations to distract victims while encrypting their files in the background. The attack initiates with a spam campaign delivering email attachments containing a Dharma dropper binary packed as a password-protected self-extracting archive named Defender.exe which is hosted on the hacked server of link[.]fivetier[.]com.

image-1557394402.png

The spam email contains the password for the malicious attachment, luring victims to open the archive and launch the Dharma executable on their system. Below is a preview of the email.

image-1557394456.png

Once Defender.exe is executed, it drops an old ESET AV Remover installer named Defender_nt32_enu.exe on the system, and a taskhost.exe Dharma binary added to C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\ which gets launched and starts encrypting the victim’s hard drives. The ransomware appends the ETH extension to encrypted file names. Researchers found that the ransomware will still encrypt files even if the installation is not started, hence the two processes are unrelated. Following ransom note is found on victim machine after encryption of files, containing an email address to be contacted for a ransom payment and decryption of files.

image-1557394679.png

Impact

Files Encryption

Indicators of Compromise

IP(s) / Hostname(s)

167[.]89[.]109[.]48

URLs

link[.]fivetier[.]com

Filename

  • Defender.exe
  • taskhost.exe1

Malware Hash (MD5/SHA1/SH256)

  • a5de5b0e2a1da6e958955c189db72467ec0f8daaa9f9f5ccc44e71c6c5d8add4
  • 703b57adaf02eef74097e5de9d0bbd06fc2c29ea7f92c90d54a0b9a01172babe

Remediation

  • Block the threat indicators at their respective controls.
  • Avoid opening suspicious emails and do not download files attached in emails coming from untrusted sources.
  • Regularly back up files.
  • Keep systems and applications updated against vulnerabilities, or use virtual patching for legacy or unpatchable systems and software.
  • Restrict user privileges to minimum.
  • Implement network segmentation and data categorization to minimize further exposure of sensitive data.

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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