Killsec Ransomware
ActiveThreat actor group tracked in the global ransomware database · Last disclosure: Mar 17, 2026
Threat Actor Analysis
Killsec is a ransomware threat group that has disclosed 276 victims in publicly accessible leak site data, representing 1.7% of all ransomware attacks tracked in this database. The earliest victim disclosure attributed to Killsec in our dataset dates to March 2026.
Geographically, Killsec has targeted organisations in 47 countries. The most frequently targeted nation is United States with 85 victim organisations. Other heavily targeted nations include India, United Kingdom, Brazil.
Industry-wise, Killsec shows a concentration in the Healthcare, Manufacturing sectors. These industries are frequently targeted because they manage sensitive data, critical operations, or have lower tolerance for operational downtime — conditions that increase ransom payment likelihood.
Like most modern ransomware operations, Killsec likely employs a double extortion model: encrypting victim files while simultaneously exfiltrating data, creating dual pressure to pay the ransom. Victim organisations that refuse payment face having their data published on the group's dark web leak site.
Note: This profile is generated from public leak site disclosures aggregated via the ransomware.live API. Data is updated automatically. The victim table below shows the 2 most recent cached victims; the total victim count (276) reflects the complete database.
Recent Victim Disclosures (2 cached of 276 total)
Frequently Asked Questions
What is Killsec ransomware?
Killsec is a ransomware threat group that has claimed 276 victims since its first known activity in March 2026. The group operates by infiltrating target networks, exfiltrating data, encrypting files, and threatening to publish stolen data on a dark web leak site if the ransom is not paid.
How many victims has Killsec attacked?
Killsec has claimed 276 victims in our database, representing 1.7% of all tracked ransomware attacks. The most targeted countries are United States, India, United Kingdom, Brazil.
Which countries does Killsec target?
Killsec has attacked organizations in 47 countries. The top targeted countries are: United States, India, United Kingdom, Brazil.
Which industries does Killsec target?
Killsec most frequently targets the Healthcare, Manufacturing sectors based on victim disclosures in our database.
Is Killsec still active?
Killsec's most recent victim disclosure in our database was on March 17, 2026. Ransomware groups frequently rebrand or go dormant; monitor this page and our ransomware map for the latest activity.