High Risk
IP 77.83.39.87 is a high-risk address operating from a Ukrainian network (ASN AS214940, Kprohost LLC) that has generated 439 abuse reports over approximately two months in mid-2026, with a threat level of 7/10 and an activity frequency rated 8/10. The dominant threat profile combines email spam distribution with active hacking activity, suggesting this infrastructure is involved in both mass communication abuse and intrusion attempts against exposed services. The 90% confidence score reflects substantial corroborating evidence from multiple detection sources.
Analysis of the reported threat categories reveals 17 email spam incidents and 12 hacking-related events logged by 20 automated honeypot sensors between May and June 2026. The honeypot detections specifically captured SMTP spam abuse patterns alongside stream-level anomalies—specifically malformed acknowledgment packets that indicate deliberate protocol manipulation attempts. This combination of high-volume spam targeting mail infrastructure alongside reconnaissance or exploitation activity directed at other services creates a dual-threat profile that distinguishes this IP from isolated nuisance traffic. The concentrated reporting window and consistent high activity frequency suggest persistent, automated operations rather than opportunistic scanning.
Email spam from addresses like 77.83.39.87 typically serves as a vector for phishing campaigns, malicious payload delivery, or advertising fraud, directly threatening end users who receive spoofed or deceptive messages. The associated hacking activity—evidenced by protocol-level anomalies and intrusion signatures—points to reconnaissance or exploitation attempts against exposed services, potentially probing for vulnerable mail transfer agents or other networked systems. The stream manipulation pattern observed in the detection data indicates sophisticated attempts to bypass basic traffic filtering by fragmenting or corrupting TCP handshake mechanics, a technique commonly employed to evade detection by legacy security appliances.
Site operators should implement robust email authentication protocols (SPF, DKIM, DMARC) to prevent spoofing and reduce the impact of spam originating from this address space. Deploying reputation-based filtering that blocks or rate-limits traffic from Ukrainian hosting providers exhibiting high abuse scores adds a proactive layer. For the hacking activity vector, ensuring all mail and network services are current with security patches, configuring intrusion detection systems to flag anomalous TCP stream behavior, and using tools such as fail2ban to dynamically block repeated connection attempts will substantially reduce exposure. Continuous monitoring of inbound traffic patterns and correlation of source IPs against community abuse feeds will help maintain situational awareness regarding evolving threat actors.
FR