Trellix Insights: RedXOR Linux backdoor
Technical Articles ID:
KB94408
Last Modified: 2022-09-07 15:32:36 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
The RedXOR Linux backdoor targets endpoints and servers to exfiltrate sensitive information from the infected system. The malicious software is possibly tied to a Chinese nation-state actor due to the malware's sophistication. RedXOR masquerades as polkit daemon, encodes network data, and is compiled with a legacy GCC compiler. The malware shares similarities to tools used by the Winnti Group including the Adore-ng open-source LKM rootkit, the CheckLKM function name, and the use of the Python pty shell.
Our Threat Research team gathers and analyzes information from multiple open and closed sources before disseminating intelligence reports. This campaign was researched by Intezer and shared publicly.
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 |
0A76C55FA88D4C134012A5136C09FB938B4BE88A382F88BF2804043253B0559F |
| SHA256 |
0423258B94E8A9AF58AD63EA493818618DE2D8C60CF75EC7980EDCAA34DCC919 |
| HOSTNAME |
update.cloudjscdn.com |
| IP-DST |
158.247.208.230 |
| IP-DST |
34.92.228.216 |
Minimum Content Versions:
| Content Type |
Version |
| V2 DAT (VirusScan Enterprise) |
9928 |
| V3 DAT (Endpoint Security) |
4380 |
Detection Summary
| IOC |
Scanner |
Detection |
| 0A76C55FA88D4C134012A5136C09FB938B4BE88A382F88BF2804043253B0559F |
AVEngine V2 |
LINUX/Redxor.a |
| AVEngine V3 |
LINUX/Redxor.a |
| JTI (ATP Rules) |
- |
| RP Static |
- |
| RP Dynamic |
- |
| IOC |
Scanner |
Detection |
| 0423258B94E8A9AF58AD63EA493818618DE2D8C60CF75EC7980EDCAA34DCC919 |
AVEngine V2 |
LINUX/Redxor.a |
| AVEngine V3 |
LINUX/Redxor.a |
| JTI (ATP Rules) |
- |
| RP Static |
- |
| RP Dynamic |
- |
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
Rule ID: 1148 CMD Tool Access by a Network Aware Application
|
