Trellix Insights: New Nokoyawa Variant Catching up to Peers with Blatant Code Reuse
Last Modified: 2022-10-19 03:34:07 Etc/GMT
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Trellix Insights: New Nokoyawa Variant Catching up to Peers with Blatant Code Reuse
Technical Articles ID:
KB96080
Last Modified: 2022-10-19 03:34:07 Etc/GMT Environment
IMPORTANT: This Knowledge Base article discusses a specific threat that is being automatically tracked by Trellix Insights technology. The content is intended for use by Trellix Insights users, but is provided for general knowledge to all customers. Contact us for more information about Trellix Insights.
Summary
Description of Campaign Nokoyawa is a new Windows ransomware that shares a substantial amount of code with variants of the Nemty ransomware, the latest being the Karma ransomware. According to researchers at Fortinet, all samples analyzed were exclusively compiled for 64-bit windows. No 32-bit samples could be found, which suggests that this is the only architecture that it's meant to run against, unlike its predecessor, which had samples found for both architectures. Similar to any ransomware, the Nokoyawa ransomware encrypts, by default, all local drives and volumes, appending the extension ".NOKOYAWA" to each encrypted file, and dropping the ransom note " Our Threat Research team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Fortinet and shared publicly. How to use this article:
Campaign IOC
Minimum Content Versions
Detection Summary
Minimum set of Manual Rules to improve protection to block this campaign: IMPORTANT: Always follow best practices when you enable new rules and signatures. When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration. For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules. Endpoint Security - Advanced Threat Protection: Rule ID: 4 Use GTI file reputation to identify trusted or malicious files Host Intrusion Prevention: Rule ID: 6070 Hidden PowerShell Detected Rule ID: 6083 PowerShell Command Restriction - NonInteractive Rule ID: 6113 T1055 - Fileless Threat: Reflective Self Injection Endpoint Security - Access Protection Custom Rules: * Subrules: Subrule Type: Files Operations: create Targets (Include): *nokoyawa_readme.txt Rule: 1 * Subrules: Subrule Type: Files Operations: create Targets (Include): *.nokoyawa VirusScan Enterprise - Access Protection Custom Rules: Process to include: * File or folder name to block: *.nokoyawa File actions to prevent: Create Rule: 1 Process to include: * File or folder name to block: *nokoyawa_readme.txt File actions to prevent: Create Aggressive set of Manual Rules to improve protection to block this campaign: IMPORTANT: Always follow best practices when you enable new rules and signatures. When you implement new rules or signatures, always set them to Report mode first and check the alerts generated. Resolve any issues that arise and then set the rules to Block. This step mitigates against triggering false positives and allows you to refine your configuration. For more information, see KB87843 - List of and best practices for Endpoint Security Dynamic Application Containment rules. Host Intrusion Prevention: Rule ID: 6010 Generic Application Hooking Protection Rule ID: 6011 Generic Application Invocation Protection Affected Products |
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