UnknownPublished 22 Mar 2026

tlp clear · KRVTZ-NET IDS alerts for 2026-03-22

Affects tlp clearSource CIRCL OSINT Feed

TLP:CLEAR, disclosure is not limited

Description

KRVTZ-NET IDS alerts for 2026-03-22

Impact

Currently, there is no confirmed exploitation or system compromise. The immediate impact is low. However, if brute force attempts succeed, unauthorized access to submission services could occur, potentially enabling further malicious actions such as abuse of email services or lateral movement within a network. Even unsuccessful attempts may increase monitoring and response efforts and indicate targeted reconnaissance preceding more serious attacks. No direct impact on confidentiality, integrity, or availability has been observed at this stage.

Defensive guidance

Recommended mitigations include enforcing strong authentication mechanisms such as multi-factor authentication on submission services, implementing rate limiting and connection throttling on haproxy or similar proxies, tuning IDS/IPS to detect and block brute force patterns, maintaining comprehensive logging and monitoring correlated with IDS alerts, using IP reputation services to block known malicious IPs like 160.119.76.59, auditing exposed submission services to minimize unnecessary exposure, and educating security teams to recognize reconnaissance as a precursor to attacks. These measures reduce attack surface and improve detection and response capabilities.

Summary

An intrusion detection system observed an IP address (160.119.76.59) making approximately 15 connection attempts within an hour to a submission service through a haproxy load balancer, suggesting possible brute force reconnaissance activity. This event is categorized under the reconnaissance phase of the cyber kill chain. There are no associated CVEs or known exploits in the wild. The alert is sourced from the CIRCL OSINT feed and is tagged with low severity.

Indicators of compromise

IP addresses 1

haproxy: 160.119.76.59 connecting to (submission/TCP) 15x in hour, possible bruteforcing.

160.119.76.59

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Description

AI analysisMachine-generated, updated 10 May 2026, 02:24 UTC

Indicators of compromise

IP addresses 1

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