5.167.66.127📋 Copy

# INTELLIGENCE BRIEFING: 5.167.66.127/32

Classification: Moderate Risk Threat Indicator

Date: 2026-06-24

Analyst: IPDebrief Threat Intelligence Team

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## EXECUTIVE SUMMARY

IP address 5.167.66.127 is a residential endpoint located in Cheboksary, Russian Federation (ASN 57026, ER-Telecom Holding). The IP exhibits moderate risk characteristics (score: 49/100) and has been flagged as a known attacker with presence on threat intelligence blocklists. The address is part of a residential PPPOE network infrastructure with elevated neighborhood abuse density.

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## NETWORK OWNERSHIP & GEOLOCATION

The IP resolves to dynamic hostname `5x167x66x127.dynamic.cheb.ertelecom.ru`, confirming residential broadband allocation. Forward DNS resolution was unsuccessful, indicating potential dynamic IP assignment.

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## THREAT INTELLIGENCE

Risk Classification: Moderate Risk (49/100)

Threat Indicators:

• Listed on blocklist.de (high severity)
• Flagged as known attacker
• Total blacklists: 1
• DNSBL listed: 8 total lists

Network Classification:

• Infrastructure Type: Residential
• Connection Type: PPPOE
• ISP: ER-Telecom Holding (ERTH)
• Not classified as proxy, CDN, VPN, or hosting infrastructure

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## OBSERVATION HISTORY

Total signal observations: 46

Recent Activity:

• 2026-06-24 20:45:56 UTC: Threat listings detected with high severity classification across 8 total lists
• 2026-06-24 17:10:03 UTC: Operator score classified as "Minimal" (0/8 signals)
• 2026-06-24 11:08:47 UTC: Operator score "Minimal"
• 2026-06-24 05:00:49 UTC: Operator score "Minimal"

Temporal Analysis:

• Threat persistence days: 0
• Ownership changes: 0
• Is persistently malicious: No
• Data sufficiency: High (6/6 dimensions covered in recent observations)

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## NETWORK RELATIONSHIPS

Total Relationships: 329

Primary Network: ERTH-CHEB-PPPOE-22-NET (ERT-Telecom Cheboksary PPPOE Network)

All relationships map to the same residential network block, confirming the IP is part of a large residential ISP customer network. No certificate or hostname relationships detected.

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## NEIGHBORHOOD ANALYSIS

Subnet: 5.167.66.0/24

Classification: High Abuse Density

Active Siblings: 134 / 256 total

Risk Distribution in Subnet:

• High Risk: 0
• Medium Risk: 23
• Low Risk: 77

Notable Neighbor IPs:

• 5.167.66.3: Risk Score 49 (Moderate Risk)
• 5.167.66.4: Risk Score 49 (Moderate Risk)
• 5.167.66.0: Risk Score 25 (Low-Moderate Risk)
• 5.167.66.1: Risk Score 25 (Low-Moderate Risk)

The neighborhood exhibits a mixed risk profile with approximately 9% of active siblings showing medium-to-high risk characteristics, suggesting concentrated abuse activity within specific residential segments.

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## RECOMMENDED ACTIONS

Firewall/IPS Rules:

• Deny Rule: Block inbound/outbound traffic to/from 5.167.66.127
• Block Range: Consider blocking subnet 5.167.66.0/24 for elevated threat activity
• Monitoring: Implement enhanced logging for any legitimate traffic patterns from this range

Threat Hunting:

• Correlate with known ER-Telecom residential abuse campaigns
• Monitor for similar blocklist listings across 5.167.64.0/22 prefix
• Review historical abuse reports for 5.167.66.x range

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## INTELLIGENCE GAP ANALYSIS

Missing Data:

• No service/port enumeration available
• No TLS certificate data
• No historical campaign correlation
• Limited ISP abuse contact information (requires RDAP query)

Confidence Level: Moderate

• GeoValidation: Partial (ICMP blocked during probe)
• Fingerprinting: Insufficient data for service identification
• Email Reputation: Not evaluated (no email services detected)

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END OF BRIEFING

This summary was generated by AI and may contain inaccuracies. Verify critical details independently.