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Kimsuky is a North Korea-aligned espionage threat actor primarily focused on intelligence collection in support of DPRK strategic objectives. The group is widely tracked under numerous aliases including APT43, Emerald Sleet, Opal Sleet, Velvet Chollima, TA406, Thallium, Black Banshee, Cerium, Springtail, Osmium, SharpTongue, Sparkling Pisces, and Ruby Sleet. Reporting has also associated the name Konni with overlapping or related DPRK activity in some contexts, although Konni is often tracked separately and should not be treated as a definitive synonym in all cases. Kimsuky has consistently targeted government entities, diplomats, defense organizations, think tanks, academics, policy specialists, public-sector personnel, and, increasingly, cryptocurrency workers, developers, and other individuals of intelligence or financial interest. The group has shown a particular focus on South Korea and other targets relevant to Korean Peninsula security, while also conducting broader international collection against organizations and individuals in the United States, Europe, and Asia. The actor is best known for spearphishing and social engineering. Common initial-access methods include malicious shortcut files, script-based attachments, archive files, decoy documents, credential-harvesting pages, and impersonation of trusted contacts or institutions. Lure themes have included resumes, business correspondence, healthcare and insurance documents, defense-related conference material, graduate education administration, and cryptocurrency topics. Kimsuky has also adopted newer user-execution tradecraft such as ClickFix-style delivery and QR-code phishing to drive victims to execute commands or submit credentials through mobile-optimized phishing workflows. Operationally, Kimsuky frequently combines decoy-document display with staged payload delivery, persistence, and remote command execution. Observed tradecraft includes extensive use of PowerShell, Windows Script Host, rundll32, WMI, scheduled tasks, startup-folder persistence, and Registry Run or RunOnce modifications. The group has also used process injection, host reconnaissance, system information discovery, security software discovery, Registry enumeration, and credential access from files. Persistence and execution chains often rely on living-off-the-land techniques and script obfuscation to reduce detection. Kimsuky regularly abuses legitimate web services and cloud platforms for payload hosting, command and control, exfiltration, and blending with normal traffic. Observed services include GitHub, GitHub Releases, Google Drive, Dropbox API, Microsoft-hosted infrastructure, and VS Code tunnel functionality. The group has used these platforms to deliver malware, collect victim profiling data, retrieve commands, and maintain covert access while evading simple reputation-based blocking. Recent activity shows Kimsuky adapting campaigns to victim class. In cryptocurrency-focused operations, the group has used fake job and technical-document lures, GitHub-hosted scripts, and system profiling before follow-on tasking. In public-sector and defense-themed campaigns, it has used tailored victim identification such as MAC-address or host-based selection before delivering final payloads. In credential-theft operations, Kimsuky has exploited weak email authentication controls, impersonated trusted entities, and used mobile-centric phishing pages that also gathered device fingerprinting data. The group’s malware ecosystem is diverse and often script-heavy, with campaigns using custom RATs, loaders, reconnaissance modules, and commodity or repurposed tooling. Across campaigns, the most stable characteristics are selective targeting, heavy reliance on social engineering, abuse of legitimate services, layered script execution, scheduled-task persistence, and flexible post-compromise collection rather than any single malware family or indicator set. Overall, Kimsuky remains one of the most active DPRK cyber espionage actors, distinguished by persistent spearphishing, rapid adaptation of new delivery mechanisms, and sustained targeting of policy, defense, academic, government, and cryptocurrency-related victims for intelligence collection and account compromise.
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.
Sectors the actor has been observed targeting.
Attributed origin per open-source reporting.
43 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
54 malware families attributed to this actor across reporting.
49 additional families tracked in Mallory.
15 CVEs this actor has used in observed campaigns. 15 of them exploited in the wild.
APT28 has used a variety of public exploits, including CVE 2020-0688 ... to gain execution on vulnerable Microsoft Exchange... Dragonfly ... exploited ... CVE-2020-0688 for ... MS Exchange... Kimsuky ... including Microsoft Exchange vulnerability CVE-2020-0688. MuddyWater has exploited the Microsoft Exchange memory corruption vulnerability (CVE-2020-0688). During the SolarWinds Compromise, APT29 exploited CVE-2020-0688 against the Microsoft Exchange Control Panel...
This detection identifies instances where Windows Explorer.exe spawns PowerShell or cmd.exe processes, particularly focusing on executions initiated by LNK files. This behavior is associated with the ZDI-CAN-25373 Windows shortcut zero-day vulnerability, where specially crafted LNK files are used to trigger malicious code execution through cmd.exe or powershell.exe. This technique has been actively exploited by multiple APT groups in targeted attacks through both HTTP and SMB delivery methods.
DPRK aligned TA406 (Opal Sleet) chained CVE-2026-21510 with CVE-2026-21509 in active campaigns.
CVE-2026-21509 (Microsoft Office RTF/OLE Code Execution) was weaponized by Russia linked TA422 (APT28) within a single day of public disclosure.
This analytic identifies potential exploitation attempts of ProxyShell (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207) and ProxyNotShell (CVE-2022-41040, CVE-2022-41082) vulnerabilities in Microsoft Exchange Server.
10 more CVEs tied to this actor tracked in Mallory.
1,612 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as a North Korean state-backed group using ClickFix-style delivery in campaigns; the article also notes North Korean crews using a fake-job ClickFake Interview lure against cryptocurrency workers.
Used malicious shortcut files and legitimate cloud services for information theft and command execution.
Using malicious QR codes in spear-phishing campaigns for credential harvesting and mobile malware delivery, including trojanized Android APKs that provide remote access to victim devices.
Conducting phishing-based malware delivery using fake Webex meeting pages and security software spoofing pages to install an HttpSpy variant RAT.
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.