UnknownPublished 22 Feb 2026

KRVTZ-NET IDS alerts for 2026-02-22

Source CIRCL OSINT Feed

TLP:CLEAR, disclosure is not limited

Description

Impact

The potential impact of these reconnaissance activities is primarily preparatory, aimed at gathering information or identifying vulnerabilities for future exploitation. Successful access to hidden environment files could expose sensitive configuration details, increasing the risk of subsequent attacks such as data breaches or unauthorized access. Prototype pollution vulnerabilities, if exploited, could lead to privilege escalation, data manipulation, or remote code execution in affected web applications. Although no active exploitation or ransomware use is reported, organizations lacking monitoring or response capabilities may face elevated risks over time. The low severity rating indicates limited immediate impact, but the presence of these activities signals active scanning and probing by attackers, which could precede more damaging attacks if vulnerabilities exist. Organizations with exposed web applications or insufficient input validation are more susceptible to these risks. Overall, the impact depends on the presence of exploitable vulnerabilities and the effectiveness of existing security controls.

Defensive guidance

1. Implement strict input validation and sanitization on all web application inputs, specifically filtering or rejecting unexpected __proto__ properties in JSON or HTTP request bodies to prevent prototype pollution attacks. 2. Restrict access to environment and configuration files by enforcing least privilege permissions and ensuring such files are not publicly accessible via web servers. 3. Monitor network traffic for suspicious inbound requests targeting hidden files or unusual HTTP payloads indicative of prototype pollution attempts. 4. Deploy and maintain web application firewalls (WAFs) with updated rules to detect and block prototype pollution and reconnaissance patterns. 5. Conduct regular security assessments and code reviews focusing on JavaScript object handling to identify and remediate prototype pollution vulnerabilities. 6. Integrate threat intelligence indicators, including the provided IP addresses (52.224.244.230, 162.240.14.171, 91.185.189.19), into intrusion detection/prevention systems for proactive blocking and alerting. 7. Educate development and security teams about prototype pollution risks and reconnaissance indicators to enhance detection and response capabilities. 8. Segment networks and limit exposure of critical systems to reduce the attack surface available to reconnaissance activities.

Indicators of compromise

IP addresses 3

52.224.244.230ET INFO Request to Hidden Environment File - Inbound
162.240.14.171ET INFO Request to Hidden Environment File - Inbound
91.185.189.19ET HUNTING Javascript Prototype Pollution Attempt via __proto__ in HTTP Body

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Description

AI analysisMachine-generated, updated 13 Mar 2026, 20:00 UTC

Indicators of compromise

IP addresses 3

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