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Grum, also known as Grum botnet, was a spam-focused botnet associated with large-scale junk email distribution. It was observed driving major increases in global spam volume and at times accounted for more than a quarter of all spam activity seen in telemetry. Reporting linked a sharp rise in its output to a significant surge in worldwide unsolicited email traffic, alongside concurrent activity from Rustock. Grum’s known operational role in the available evidence is bulk spam delivery rather than ransomware, espionage, or destructive intrusion activity. The observed campaigns indicate high-volume abuse of compromised systems for email distribution and coordination within the broader spam botnet ecosystem.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Geographies tied to known operations.
1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Botnet associated with a major increase in global spam volume, responsible for more than a quarter of all spam in the reporting period.
A major spam botnet whose output increased significantly in February and was responsible for a large share of global spam volume.
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.