Trellix Insights: Kovter Group malvertising campaign
Technical Articles ID:
KB93029
Last Modified: 2022-08-19 12:29:21 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
This malvertising campaign targeted victims in the US, Canada, UK, and Australia, using malware from the Kovter family. The threat actors behind the operation (named KovCoreG by security researchers) used high-ranking websites to carry out the attacks. Users were redirected to a website that advised the user to run a browser or Flash update. The update was malicious and contained the Kovter malware.
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.
Campaign IOC
| Type |
Value |
| SHA256 |
0E4763D4F9687CB88F198AF8CFCE4BFB7148B5B7CA6DC02061B0BAFF253EEA12 |
| SHA256 |
F449DBFBA228AD4B70C636B8C46E0BFF1DB9139D0EC92337883F89FBDAFF225E |
| SHA256 |
4ebc6eb334656403853b51ac42fb932a8ee14c96d3db72bca3ab92fe39657db3 |
| SHA256 |
a9efd709d60e5c3f0b2d51202d7621e35ba983e24aedc9fba54fb7b9aae14f35 |
| IP address |
204.155.152.173 |
| IP address |
192.129.215.155 |
Minimum Content Versions:
| Content Type |
Version |
| V2 DAT (VirusScan Enterprise) |
8678 |
| V3 DAT (Endpoint Security) |
3129 |
Detection Summary
| IOC |
Scanner |
Detection |
| 0E4763D4F9687CB88F198AF8CFCE4BFB7148B5B7CA6DC02061B0BAFF253EEA12 |
AVEngine V2 |
Dropper-FRM!51478A02A1EB |
| AVEngine V3 |
Dropper-FRM!51478A02A1EB |
| JTI (ATP Rules) |
ATP/Suspect!3259da57ca8a |
| RP Static |
Real Protect-LS!51478a02a1eb |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| F449DBFBA228AD4B70C636B8C46E0BFF1DB9139D0EC92337883F89FBDAFF225E |
AVEngine V2 |
Dropper-FRM!CA58F0CFCA43 |
| AVEngine V3 |
Dropper-FRM!CA58F0CFCA43 |
| JTI (ATP Rules) |
JTI/Suspect.196612!ca58f0cfca43 |
| RP Static |
Real Protect-LS!ca58f0cfca43 |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| A9EFD709D60E5C3F0B2D51202D7621E35BA983E24AEDC9FBA54FB7B9AAE14F35 |
AVEngine V2 |
JS/Nemucod.zy |
| AVEngine V3 |
JS/Nemucod.zy |
| JTI (ATP Rules) |
- |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| 4EBC6EB334656403853B51AC42FB932A8EE14C96D3DB72BCA3AB92FE39657DB3 |
AVEngine V2 |
JS/Nemucod.zy |
| AVEngine V3 |
JS/Nemucod.zy |
| JTI (ATP Rules) |
- |
| RP Static |
- |
| RP Dynamic |
-
|
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: 239 Identify suspicious command parameter execution
Rule ID: 322 Prevent mshta from being launched by any process for all rule group assignments
Rule ID: 4 Use GTI file reputation to identify trusted or malicious files
Endpoint Security - Exploit Prevention:
Rule ID: 6121 Fileless Threat: Shellcode Self Injection
Rule ID: 6096 Powershell Command Restriction - InvokeExpression
Rule ID: 6151 Unmanaged Powershell Detected - II
Rule ID: 6120 Fileless Threat: Process Hollowing
Host Intrusion Prevention:
Rule ID: 6121 Fileless Threat: Shellcode Self Injection
Rule ID: 6096 Powershell Command Restriction - InvokeExpression
Rule ID: 6120 Fileless Threat: Process Hollowing
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: 344 New Startup Program Creation
Rule ID: 1020 Windows Agent Shielding - File Access
Rule ID: 2806 Attempt to create a hardlink to a file
Endpoint Security - Dynamic Application Containment:
Modifying the Services registry location
|
