Rook
Hunt this family in your stack
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
Groups observed using it
3 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
We also uncovered the reemergence of Andariel in South Korea, where the group deployed TigerRAT and attempted to spread Rook ransomware within an engineering company
"ESET APT Activity Report Q4 2025–Q1 2026" published by ESET. #Andariel, #DangerousPassword, #DeceptiveDevelopment, #DreamJob, #Rook, #ScarCruft, #DPRK, #CTI
Their payloads are sometimes rebuilt from existing for-purchase ransomware tools like Rook, which shares code similarity with the Babuk ransomware family.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
"ESET APT Activity Report Q4 2025–Q1 2026" published by ESET. #Andariel, #DangerousPassword, #DeceptiveDevelopment, #DreamJob, #Rook, #ScarCruft, #DPRK, #CTI
A ransomware family that Andariel attempted to spread within a South Korean engineering company.
For-purchase ransomware tool whose code was reused or rebuilt by DEV-0401.
The version that knows your environment.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.