Summary (Bottom Line Up Front)
External threat actor conducted sustained SMB reconnaissance targeting organizational networks from Italian ISP infrastructure between March 1-12, 2026. Assessment indicates HIGH threat level due to SMBv1 protocol exploitation attempts, representing precursor activity for potential EternalBlue-style attacks. Immediate SMB hardening and monitoring implementation recommended.
Activity Timeline
INITIAL REPORT2026-03-21T12:03:30Z
Source: Analyst Manual Entry
External threat actor conducted sustained SMB reconnaissance targeting organizational networks from Italian ISP infrastructure between March 1-12, 2026. Assessment indicates HIGH threat level due to SMBv1 protocol exploitation attempts, representing precursor activity for potential EternalBlue-style attacks. Immediate SMB hardening and monitoring implementation recommended.
Technical details
Threat actor 93.55.131.150 (Fastweb SpA/AS12874, Naples, IT) conducted 18 reconnaissance events over 11-day period targeting SMB services. Activity consistent with MITRE T1190 (Exploit Public-Facing Application) during reconnaissance phase of cyber kill chain. Primary attack vectors included SMBv1 protocol negotiation attempts across 2 unique destination ports. AbuseIPDB reputation score of 100/100 confirms malicious infrastructure usage. Open port 161 (SNMP) on source system suggests compromised endpoint or botnet participation.
IOCs
IP:93.55.131.150
ASN:12874
COUNTRY:IT
Recommendations
- Immediately disable SMBv1 protocol across all Windows systems and network infrastructure
- Implement network segmentation to restrict SMB traffic (ports 445, 139) from external sources
- Deploy enhanced monitoring for SMB connection attempts from external IP ranges
- Conduct vulnerability assessment of all SMB-enabled systems for EternalBlue and related exploits
- Block traffic from 93.55.131.150 and monitor for additional reconnaissance from AS12874 address space