Full Report
The following is the information on Yara and Snort rules (week 1, December 2024) collected and shared by the AhnLab TIP service. 0 YARA Rules 3 Snort Rules Detection name Source ET EXPLOIT Linksys E1500/E2500 Remote Command Execution 3 https://rules.emergingthreatspro.com/open/ ET WEB_SPECIFIC_APPS SonicWall NetExtender for Windows EPC Client Update RCE Attempt (CVE-2024-29014) https://rules.emergingthreatspro.com/open/ ET CURRENT_EVENTS […] 게시물 Weekly Detection Rule (YARA and Snort) Information – Week 1, December 2024이 ASEC에 처음 등장했습니다.
Analysis Summary
# Tool/Technique: Emerging Threats (ET) Rules (Snort/YARA)
## Overview
This entry summarizes detection rules (YARA and Snort) identified and shared by the AhnLab TIP service during the first week of December 2024. These rules are designed to detect specific exploits, application vulnerabilities, and known threat actor activity delivered via network traffic or file patterns.
## Technical Details
- Type: Detection Rules/Signatures (Snort for network/behavioral, YARA for file content)
- Platform: Network traffic monitoring systems (Snort) and endpoint analysis tools (YARA).
- Capabilities: Identifying specific network signatures related to known exploits (e.g., RCE attempts) and malware delivery mechanisms (e.g., TA582 JS delivery).
- First Seen: Week 1, December 2024 (as per reporting period).
## MITRE ATT&CK Mapping
The specific mappings depend on the individual rule signature being triggered, but the rules provided generally target the following high-level tactics based on the detection names:
- **TA0001 - Initial Access**
- T1190 - Exploit Public-Facing Application (Relevant for Linksys and SonicWall RCE attempts)
- **TA0011 - Command and Control**
- T1071 - Application Layer Protocol (Relevant if the delivery mechanism uses common protocols)
*Note: Specific T#### mappings for the exact RCE or delivery techniques are not provided in the context, but the listed threats strongly imply Initial Access and Execution tactics.*
## Functionality
### Core Capabilities
- **Detecting Exploitation Attempts:** Identifying network traffic indicative of remote command execution (RCE) attempts against vulnerable devices (e.g., Linksys routers, SonicWall NetExtender).
- **Identifying Malware Delivery:** Recognizing patterns associated with known threat actor delivery methods, such as JavaScript delivery pages used by specific groups.
### Advanced Features
- **Vulnerability-Specific Detection:** Rules are tailored to detect activity targeting specific CVEs or software flaws (e.g., CVE-2024-29014).
## Indicators of Compromise
The context provides only the *names* of the rules, not the specific IOCs contained within the rule files.
- File Hashes: N/A (Rules detect network/file patterns, not specific malware hashes directly in this summary)
- File Names: N/A
- Registry Keys: N/A
- Network Indicators: N/A (The detection names reference the sources/targets of the exploit, e.g., Linksys E1500/E2500, SonicWall NetExtender)
- Behavioral Indicators: Triggered by network payload matching the signature patterns.
## Associated Threat Actors
- **TA582:** Explicitly mentioned in relation to the JS Delivery Page rule.
- **Unknown Actors:** Actors exploiting the Linksys E1500/E2500 RCE.
- **Unknown Actors:** Actors exploiting the SonicWall NetExtender RCE (CVE-2024-29014).
## Detection Methods
- **Signature-based Detection:** Snort rules detect network patterns or payloads.
- **Content-based Detection:** YARA rules (though 0 were reported this week) detect specific strings or structures within files.
## Mitigation Strategies
Based on the detected threats:
- **Patch Management:** Promptly apply patches for identified vulnerabilities, specifically relating to Linksys firmware and SonicWall NetExtender (CVE-2024-29014).
- **Network Segmentation:** Limit external access to vulnerable network devices.
- **Traffic Filtering:** Utilize Snort/IPS systems to block known exploit signatures targeting these devices.
## Related Tools/Techniques
- **ET EXPLOIT Linksys E1500/E2500 Remote Command Execution 3:** Related to network device insecurity/vulnerability exploitation.
- **ET WEB\_SPECIFIC\_APPS SonicWall NetExtender for Windows EPC Client Update RCE Attempt (CVE-2024-29014):** Focused on specific application weaknesses.
- **ET CURRENT\_EVENTS TA582 JS Delivery Page 2024-11-27:** Related to common phishing/malware distribution tactics used by TA582.