Trellix Insights: TrickBot offers new TrickBoot
Technical Articles ID:
KB94177
Last Modified: 2022-09-01 13:38:47 Etc/GMT
Last Modified: 2022-09-01 13:38:47 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
A new TrickBot functionality was discovered with the ability to probe the UEFI/BIOS firmware on targeted devices. The module, known as "Trickboot," checks if the BIOS is unlocked and can be modified by using the RwDrv.sys driver from the RWEverything tool. A successful infection could allow an attacker to perform a range of tasks including corrupting the UEFI firmware, disabling OS-level security controls, embedding malicious code in the firmware, and taking control of devices all at once.
How to use this article:
- If a Threat Hunting table has been created, use the rules contained to search for malware related to this campaign.
- Review the product detection table and confirm that your environment is at least on the specified content version.
To download the latest content versions, go to the Security Updates page. - Scroll down and review the "Product Countermeasures" section of this article. Consider implementing them if they are not already in place.
- Review
KB91836 - Countermeasures for entry vector threats . - Review KB87843 - Dynamic Application Containment rules and best practices.
- Review KB82925 - Identify what rule corresponds to an Adaptive Threat Protection and Threat Intelligence Exchange event.
Threat Hunting:
meta: description = "Detects TrickBot module decrypter permaDll" md5 = "491115422a6b94dc952982e6914adc39" strings: $module_cfg = "moduleconfig" $str_imp_01 = "Start" $str_imp_02 = "Control" $str_imp_03 = "FreeBuffer" $str_imp_04 = "Release" $module = "user_platform_check.dll" $intro_routine = { 83 ec 40 8b ?? ?? ?? 53 8b ?? ?? ?? 55 33 ed a3 ?? ?? ?? ?? 8b ?? ?? ?? 56 57 89 ?? ?? ?? a3 ?? ?? ?? ?? 39 ?? ?? ?? ?? ?? 75 ?? 8d ?? ?? ?? 89 ?? ?? ?? 50 6a 40 8d ?? ?? ?? ?? ?? 55 e8 ?? ?? ?? ?? 85 c0 78 ?? 8b ?? ?? ?? 85 ff 74 ?? 47 57 e8 ?? ?? ?? ?? 8b f0 59 85 f6 74 ?? 57 6a 00 56 e8 ?? ?? ?? ?? 83 c4 0c eb ??} condition: 6 of them } |
Campaign IOC
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Minimum Content Versions:
| Content Type | Version |
Detection Summary
| IOC | Scanner | Detection |
| IOC | Scanner | Detection |
| IOC | Scanner | Detection |
| IOC | Scanner | Detection |
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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:
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.
Virusscan Enterprise - Access Protection Rules:
Host Intrusion Prevention:
Rule ID: 2265 Delay Delete File Protection
Rule ID: 1020 Windows Agent Shielding - File Access
Rule ID: 6011 Generic Application Invocation Protection
Rule ID: 1148 CMD Tool Access by a Network Aware Application
Rule ID: 6010 Generic Application Hooking Protection
