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SamSam was a ransomware threat actor and associated malware operation widely assessed as originating from Iran. It is notable as an early practitioner of targeted ransomware intrusions against large organizations rather than indiscriminate mass spam campaigns, helping establish the pattern later described as big-game hunting. Active by at least 2015 and prominent through the late 2010s, the operation targeted critical infrastructure and large enterprises, including government and healthcare organizations, especially in the United States and Canada. U.S. authorities later indicted two Iranian men for deploying SamSam against more than 200 victims and causing losses exceeding tens of millions of dollars. SamSam operations involved deliberate compromise of victim networks followed by ransomware deployment inside enterprise environments. The group is associated with hands-on intrusion activity and post-compromise actions consistent with targeted ransomware tradecraft, including initial access, lateral movement, credential theft, and data exfiltration in some ransomware intrusion contexts. SamSam is frequently cited as an early example of Iranian ransomware activity directed at major organizations and critical services, including hospitals. Its activity is primarily characterized as financially motivated, although Iranian cyber operations more broadly have at times blended disruptive, espionage, and revenue-generating objectives. SamSam is commonly referenced simply as SamSam and does not have a broad set of widely used alternative public names comparable to some state-linked clusters. Its historical significance lies in pioneering targeted enterprise ransomware operations against high-value victims in North America.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
2 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Mentioned only as an associated analytic story title in the detection page metadata.
Mentioned only as part of an associated analytic story list for a removed Splunk detection.
Referenced historically in discussion of ransomware recovery firms secretly paying gangs; not part of the main event.
Referenced as an example of early ransomware activity that was initially concentrated in the US and later expanded geographically as pressure and opportunity shifted.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.