Summary (Bottom Line Up Front)
A Russian-based threat actor (176.115.192.229) conducted an intensive SMBv1 exploitation campaign generating over 64,000 attack events between April 5-9, 2026. This represents a HIGH severity threat targeting legacy SMB implementations with known exploitation techniques. Organizations should immediately audit SMB configurations and implement recommended mitigations.
Activity Timeline
INITIAL REPORT2026-04-09T10:48:04Z
Source: Analyst Manual Entry
A Russian-based threat actor (176.115.192.229) conducted an intensive SMBv1 exploitation campaign generating over 64,000 attack events between April 5-9, 2026. This represents a HIGH severity threat targeting legacy SMB implementations with known exploitation techniques. Organizations should immediately audit SMB configurations and implement recommended mitigations.
Technical details
- Source: 176.115.192.229 (AS50241 Unittel Ltd, Russia)
- Campaign Duration: April 5, 2026 05:00 - April 9, 2026 12:00 (4.3 days)
- Attack Volume: 64,063 events targeting 2 unique destination ports
- Primary Technique: SMBv1 detection and exploitation probes (33,561 hits)
- Protocols: SMB, TCP SYN scanning
- MITRE ATT&CK: T1021.002 (Remote Services: SMB/Windows Admin Shares)
- Kill Chain Phase: Reconnaissance and Initial Access
- IOC: 176.115.192.229
IOCs
IP:176.115.192.229
ASN:50241
COUNTRY:RU
Recommendations
- Disable SMBv1 protocol across all Windows systems and network infrastructure immediately
- Implement network segmentation to restrict SMB traffic to authorized systems only
- Deploy enhanced monitoring for SMB connection attempts from external IP ranges
- Conduct vulnerability assessment focusing on legacy file sharing services and protocols
- Block traffic from 176.115.192.229 and monitor for similar scanning patterns from AS50241 netblock