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Subnet 121.191.167.0/24

SUBNET Active high

Why this campaign was detected

3 IPs from the same /24 subnet (121.191.167.0/24) were observed attacking our sensors within the same time window. All belong to Korea Telecom (AS4766). Concentrated activity from adjacent IPs is a strong indicator of a single operator or coordinated botnet.

Primary ASN

AS4766 · Korea Telecom

Subnet

121.191.167.0/24

Country

🇰🇷 KR

Cloud Provider

—

Member Count

3 IPs

Below average

Total Events

1622

Below average by volume

Started / Ended

2026-09-26 14:29 — ongoing

Attack Types

telnet:connection telnet:credential-reuse telnet:intrusion telnet:malware

MITRE ATT&CK Techniques

Reconnaissance

T1595 T1595.001

Initial Access

T1078

Execution

T1059.004

Discovery

T1046

Command and Control

T1105

Member Actors

IP Address	Behavior	Confidence	Events	Agents	Attack Types	Hostname	Last Seen
121.191.167.81	scanner	77%	204	3	telnet:connectiontelnet:intrusiontelnet:malware	—	2026-10-19 05:17	evidence →
121.191.167.183	interactive_operator	64%	1316	4	telnet:connectiontelnet:credential-reusetelnet:intrusion	—	2026-10-10 20:46	evidence →
121.191.167.116	interactive_operator	48%	152	2	telnet:connectiontelnet:intrusion	—	2026-10-13 15:51	evidence →

VPN Known VPN or proxy provider

DROP ASN on Spamhaus DROP list

Nx OSINT Corroborated by N external threat feeds