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Threat Actor

APT37

apt37_reaper · north_korea · active since 2012

APT37 (Reaper / ScarCruft / Ricochet Chollima / InkySquid / Group 123 / TEMP.Reaper / RedEyes / Geumseong121 / Venus 121 / Moldy Pisces / APT-C-28 / ATK4 / G0067) is a North Korean state-sponsored cyber-espionage actor active since at least 2012, attributed to the DPRK Reconnaissance General Bureau and operationally distinct from Lazarus, APT38/Bluenoroff, and Kimsuky.

the most-aliased DPRK cluster in public reporting (~12 tracked names) with a mission focus on geopolitical intelligence collection, distinct from APT38's financial-heist mandate and Kimsuky's policy-research surveillance, targeting South Korean government, ministry of unification, think tanks, North Korean defectors, journalists, and human-rights organizations, expanding since 2017 to Japan, Vietnam, the Middle East, and recently Czechia and Poland.

APT37 is technically distinguished by sustained zero-day capability across browser and Flash exploitation over more than a decade (CVE-2016-4171 Operation Daybreak, CVE-2016-7892 Operation Erebus, CVE-2018-4878, CVE-2020-1380, CVE-2021-26411 InkySquid, CVE-2022-41128 Itaewon- themed Google TAG disclosure), uncommonly resourced among DPRK clusters.

tradecraft signatures include the long-running RokRAT implant family, heavy legitimate-cloud-service abuse for C2 (Dropbox, Google Drive, Yandex, pCloud, GitHub), watering-hole compromises of South Korean-focused websites, Android surveillance implants (KevDroid), Bluetooth-device proximity-fingerprinting, sophisticated multi-stage Python implants (Dolphin, ESET 2022), and recent cloud OAuth refresh-token abuse for stealthy re-entry.

north_korea confidence: high 42 aliases MITRE ATT&CK G0067 ↗

Profile

APT37 (Reaper / ScarCruft / Ricochet Chollima / InkySquid / Group 123 / TEMP.Reaper / RedEyes / Geumseong121 / Venus 121 / Moldy Pisces / APT-C-28 / ATK4 / ITG10 / G0067) is a North Korean state-sponsored cyber-espionage actor active since at least 2012, attributed to the DPRK Reconnaissance General Bureau (RGB) but operationally distinct from Lazarus Group, APT38 (Bluenoroff), and Kimsuky. Among the most-aliased DPRK clusters in public reporting (~12 tracked names), APT37's mission focus is sustained geopolitical intelligence collection, distinct from APT38/Bluenoroff's financial heist mandate and Kimsuky's policy- research surveillance focus. Primary targeting since 2012 has centered on South Korean government (especially the Ministry of Unification and foreign- affairs entities), academia and think tanks researching North Korea, North Korean defectors and dissidents, journalists covering the DPRK, and human rights organizations. The 2017 global expansion broadened targeting to Japan, Vietnam, Russia, Nepal, China, India, Romania, Kuwait, and other Middle Eastern states, extending into chemicals, electronics, manufacturing, aerospace, automotive, and healthcare sectors. Recent operations (2022-2025) have extended to Eastern European targets (Czechia, Poland) aligned with DPRK foreign-policy and sanctions-evasion interests. APT37's distinguishing technical characteristic is sustained zero-day capability across browser and Flash exploitation, uncommonly resourced among DPRK clusters. Documented zero-days include CVE-2016-4171 (Flash, Operation Daybreak), CVE-2016-7892 (Flash, Operation Erebus), CVE-2018-4878 (Flash), CVE-2020-1380 and CVE-2021-26411 (Internet Explorer / MSHTML, InkySquid browser exploitation), and CVE-2022-41128 (Internet Explorer JScript engine, the December 2022 Itaewon-themed campaign disclosed by Google TAG). The sustained zero-day investment over a decade positions APT37 as the DPRK's most consistent browser-exploitation specialist. Tradecraft hallmarks: (a) the ROKRAT implant family, continuously evolved across nearly a decade from PE format to LNK-file delivery to fileless operation.

(b) heavy abuse of legitimate cloud services for C2 and exfiltration (Dropbox, Google Drive, Yandex, pCloud, GitHub, a signature DPRK pattern now broadly adopted across the regime's cyber ecosystem); (c) watering-hole compromises of South Korean-focused websites (notably the InkySquid August 2021 Daily NK newspaper compromise); (d) geopolitically-themed spear-phishing lures aligned with current Korean-peninsula events.

(e) Android surveillance implants for mobile collection (KevDroid)

(f) Bluetooth-device harvesting for proximity intelligence (Kaspersky 2019)

(g) sophisticated multi-stage loaders and Python-based implants (Dolphin, ESET November 2022)

(h) recent (2024+) cloud OAuth refresh-token abuse for stealthy re-entry into compromised cloud environments. Note on DPRK cluster boundaries: MITRE explicitly notes that DPRK group definitions overlap, with some vendors consolidating all DPRK state activity under Lazarus Group. APT37 is tracked separately from Lazarus, APT38, and Kimsuky by Mandiant, Microsoft, Kaspersky, and others based on distinct tooling signatures, infrastructure clusters, and mission focus, though some operational coordination across RGB sub-clusters is acknowledged.

Aliases

42
apt37inkysquidinky squidscarcruftscar cruftreaperreaper groupgroup123group 123temp.reapertemp reaperricochet chollimared eyesredeyesmoldy piscesapt-c-28apt c 28atk4atk 4venus 121venus121geumseong121geumseong 121hermititg10ta-redantta redanttaredantoperation daybreakoperation erebusoperation hankook phantomgolden timeevil new yearfreemilkfree milkare you happyrgbreconnaissance general bureaudprkg0067apt 37apt-37

Notable Campaigns

13
2025Operation HanKook Phantom (Seqrite August 2025)
2024Cloud Authorization Token Abuse for Stealthy Re-Entry (2024)
2023M2RAT Disclosure (AhnLab February 2023)
2022-2026RokRAT LNK / ROKRAT Continued Evolution (2022-2026)
2022Dolphin Backdoor Discovery (ESET November 2022)
2022Internet Explorer Zero-Day CVE-2022-41128 (Google TAG December 2022)
2022Konni RAT Targeting Czechia and Poland (July 2022)
2021InkySquid Browser Exploits (Volexity August 2021)
2019Bluetooth Harvester Disclosure (Kaspersky May 2019)
2018KevDroid Android Surveillance Implant (Cisco Talos January 2018)
2018FireEye APT37, The Overlooked North Korean Actor (February 2018)
2016Operation Daybreak (March 2016)
2016Operation Erebus (2016)

Attribution & Reporting

Attributed by
CISAFBINSAUS Cyber CommandUS Department of StateRepublic of Korea NISRepublic of Korea KISARepublic of Korea NCSCJapan NPAUK NCSCFive EyesMicrosoftMandiantFireEyeGoogle Cloud Threat IntelligenceGoogle Threat Analysis GroupCrowdStrikeKaspersky GReATCisco TalosSymantec / BroadcomTrend MicroSentinelOneESETVolexityAhnLab ASECS2WSecuronixRecorded FutureInsikt GroupCheck Point ResearchSecurityscientistSeqriteZscaler ThreatLabzESRCTencentThalesIBM X-Force
Key reporting
reportFireEye / Mandiant: APT37 (Reaper), The Overlooked North Korean Actor (February 20, 2018)
reportKaspersky GReAT: Operation Daybreak (June 17, 2016)
reportKaspersky GReAT: ScarCruft Continues to Evolve, Introduces Bluetooth Harvester (May 13, 2019)
reportKaspersky GReAT: ScarCruft Surveilling North Korean Defectors and Human Rights Activists (August 2022)
reportCisco Talos: Korea in the Crosshairs (January 16, 2018)
reportCisco Talos: ROKRAT Reloaded and Reused (multiple, 2017-2018)
reportVolexity: North Korean APT InkySquid Infects Victims Using Browser Exploits (August 17, 2021)
reportVolexity: North Korean BLUELIGHT Special, InkySquid Deploys RokRAT (August 25, 2021)
reportGoogle Threat Analysis Group: Internet Explorer 0-Day Exploited by North Korean Actor APT37 (December 2022)
reportESET: Who's Swimming in South Korean Waters? Meet ScarCruft's Dolphin (November 30, 2022)
reportAhnLab ASEC: M2RAT Disclosure (February 2023)
reportAhnLab ASEC: ROKRAT LNK Delivery Reports (multiple, 2022-2025)
reportSecuronix: STIFF#BIZON, Konni RAT APT37 Czechia/Poland (July 2022)
reportSeqrite: Operation HanKook Phantom, APT37 Targeting South Korea (August 2025)
reportZscaler ThreatLabz: APT37 and RokRAT Malware (multiple, 2025-2026)
reportCrowdStrike: Adversary Profile, Ricochet Chollima
reportCrowdStrike: Two Years of Pwning Proton (RokRAT cloud abuse)
reportProofpoint: North Korea Bitten by Bitter APT (cross-reference)
reportEuRepoC: APT Profile, APT 37
reportCouncil on Foreign Relations: APT 37 Cyber Operations Tracker

Operational

State sponsor

Democratic People's Republic of Korea (DPRK), assessed by multiple vendors as a Reconnaissance General Bureau (RGB) sub-cluster operationally distinct from Lazarus Group, APT38 (Bluenoroff), and Kimsuky. Mission focus on geopolitical intelligence collection rather than financial heist operations distinguishes APT37 from APT38, while focus on broad targeting (South Korea + global expansion since 2017) distinguishes it from Kimsuky's policy-research focus.

Motivations
espionage, intelligence_gathering, geopolitical_collection, dissident_surveillance, defector_targeting, regime_objectives, foreign_policy_intelligence, dual_use_research_targeting, opportunistic_financial_activity
Sectors
Regions

Detection Blind Spots

60 techniques
Across this actor’s 60 mapped techniques, the share covered by each detection layer. Low bars are where you’d be blind if this actor targeted you.
Behavioral / log (Sigma)57/60 · 95%
Analytics (MITRE CAR)33/60 · 55%
Runtime / container (Falco)5/60 · 8%
File / malware (YARA)0/60 · 0%
Network (Suricata/Snort)16/60 · 26%
Vuln scan (Nuclei)0/60 · 0%

Atomic Test Plan

30 techniques
Runnable Atomic Red Team tests covering this actor’s mapped techniques - validate your detections against this specific adversary. Cross-reference the blind spots above. For authorized lab / purple-team use. Open the full builder
Intelligence Graph · click any node to traverse
CVETechnique ActorTool Family
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