S0622: AppleSeed

AppleSeed matters because ATT&CK describes it as a backdoor used by Kimsuky against government, academic, and commercial targets, with Windows and Android listed as platforms. The relationship set shows behavior beyond simple remote access: discovery, local and removable-media data collection, keylogging, screen capture, web-based command and control, fallback channels, staging, exfiltration over C2, and stealth through obfuscation, packing, masquerading, and file deletion.

Executive priority

Treat AppleSeed as a decision point for resilience and evidence readiness: can the organization prove it would see suspicious endpoint discovery, data collection, credential capture, and web-based C2/exfiltration on Windows and relevant Android assets? Leaders should prioritize telemetry retention, egress visibility, removable-media governance, endpoint hardening, and incident response procedures over relying on a named-malware signature, because ATT&CK provides no official detection guidance for this object.

Technical view

SOC and IR teams should validate coverage behaviorally against the related techniques: PowerShell and JavaScript execution, process/system/network/file discovery, local and removable-media collection, local staging, keylogging/screen capture indicators, web protocol C2, fallback communications, chunked or threshold-aware transfer patterns, and cleanup/masquerading behaviors. Detection engineering should separate normal administrative discovery and scripting from suspicious chains that combine discovery, collection, staging, and outbound web traffic from unusual processes or locations.

Likely telemetry

Endpoint process creation, command line, parent-child process, and script execution logs, especially PowerShell and JavaScript/JScript activity on Windows
File creation, modification, deletion, rename, staging-directory, and packed/obfuscated executable metadata
Endpoint discovery signals: process listing, system information, network configuration, time, and file/directory enumeration
Removable media connection and file access events where collected
Network proxy, firewall, DNS, TLS, and web request metadata for outbound HTTP/S-like command-and-control patterns

Detection direction

Do not depend only on AppleSeed-specific indicators; ATT&CK supplies no official detection text, so validate technique-level analytics and investigative pivots.
Tune for behavior chains: discovery followed by local staging, collection from local or removable sources, then web-based outbound communication is higher value than any single command.
Review false positives from administrators, inventory tools, backup agents, remote support software, and endpoint management platforms that legitimately perform discovery or scripting.
Hunt for masquerading and legitimate-looking resource names or locations, especially when paired with unusual network destinations or file deletion after execution.
Assess whether web egress monitoring can distinguish normal browser traffic from non-browser processes using web protocols, and whether fallback or alternate channels would be visible.

Mitigation priorities

Prioritize endpoint visibility and hardening on Windows and managed Android assets in scope.
Restrict and monitor script execution, especially PowerShell and JavaScript/JScript, using least privilege and approved administrative workflows.
Control outbound web traffic with proxying, destination reputation/context, and logging sufficient for incident reconstruction.
Limit removable media use and monitor permitted media for sensitive data access where business operations allow.
Apply least privilege and data access controls to reduce the value of local collection and credential capture.

Analyst notes and limits

The supplied ATT&CK relationships make AppleSeed useful for building a defensive validation plan even though the malware object itself has no ATT&CK tactics listed and no official detection text. The strongest defensive value is mapping the related techniques into telemetry, control, and response evidence requirements.

This take is limited to the supplied ATT&CK fields, external references, and relationships. It does not assert current activity, customer exposure, specific indicators, exploit paths, or guaranteed detection. Local asset inventory, logging configuration, mobile management coverage, and business process context are required to determine actual risk and coverage.

Official MITRE ATT&CK definition

AppleSeed

AppleSeed is a backdoor that has been used by Kimsuky to target South Korean government, academic, and commercial targets since at least 2021.[1]

View the same entry on attack.mitre.org (MITRE-hosted reference; in-page links above use the Glexia ATT&CK library.)

Glexia analysis

How security teams should use this page

Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.

ATT&CK relationship table

Techniques used

This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.

Filter related techniques 32 rows

Domain	ID	Name	Relationship / procedure
Enterprise	T1059.007	JavaScript Sub-technique	AppleSeed has the ability to use JavaScript to execute PowerShell.[1]
Enterprise	T1059.001	PowerShell Sub-technique	AppleSeed has the ability to execute its payload via PowerShell.[1]
Enterprise	T1027.002	Software Packing Sub-technique	AppleSeed has used UPX packers for its payload DLL.[1]
Enterprise	T1016	System Network Configuration Discovery	AppleSeed can identify the IP of a targeted system.[1]
Enterprise	T1036	Masquerading	AppleSeed can disguise JavaScript files as PDFs.[1]
Enterprise	T1566.001	Spearphishing Attachment Sub-technique	AppleSeed has been distributed to victims through malicious e-mail attachments.[1]
Enterprise	T1140	Deobfuscate/Decode Files or Information	AppleSeed can decode its payload prior to execution.[1]
Enterprise	T1057	Process Discovery	AppleSeed can enumerate the current process on a compromised host.[1]
Enterprise	T1134	Access Token Manipulation	AppleSeed can gain system level privilege by passing `SeDebugPrivilege` to the `AdjustTokenPrivilege` API.[1]
Enterprise	T1056.001	Keylogging Sub-technique	AppleSeed can use `GetKeyState` and `GetKeyboardState` to capture keystrokes on the victim’s machine.[1]CitationKISA Operation Muzabi
Enterprise	T1005	Data from Local System	AppleSeed can collect data on a compromised host.[1]CitationKISA Operation Muzabi
Enterprise	T1036.005	Match Legitimate Resource Name or Location Sub-technique	AppleSeed has the ability to rename its payload to ESTCommon.dll to masquerade as a DLL belonging to ESTsecurity.[1]
Enterprise	T1082	System Information Discovery	AppleSeed can identify the OS version of a targeted system.[1]
Enterprise	T1119	Automated Collection	AppleSeed has automatically collected data from USB drives, keystrokes, and screen images before exfiltration.CitationKISA Operation Muzabi
Enterprise	T1567	Exfiltration Over Web Service	AppleSeed has exfiltrated files using web services.CitationKISA Operation Muzabi
Enterprise	T1030	Data Transfer Size Limits	AppleSeed has divided files if the size is 0x1000000 bytes or more.CitationKISA Operation Muzabi
Enterprise	T1106	Native API	AppleSeed has the ability to use multiple dynamically resolved API calls.[1]
Enterprise	T1560	Archive Collected Data	AppleSeed has compressed collected data before exfiltration.CitationKISA Operation Muzabi
Enterprise	T1008	Fallback Channels	AppleSeed can use a second channel for C2 when the primary channel is in upload mode.[1]
Enterprise	T1041	Exfiltration Over C2 Channel	AppleSeed can exfiltrate files via the C2 channel.[1]
Enterprise	T1083	File and Directory Discovery	AppleSeed has the ability to search for .txt, .ppt, .hwp, .pdf, and .doc files in specified directories.[1]
Enterprise	T1027	Obfuscated Files or Information	AppleSeed has the ability to Base64 encode its payload and custom encrypt API calls.[1]
Enterprise	T1071.001	Web Protocols Sub-technique	AppleSeed has the ability to communicate with C2 over HTTP.[1]CitationKISA Operation Muzabi
Enterprise	T1070.004	File Deletion Sub-technique	AppleSeed can delete files from a compromised host after they are exfiltrated.[1]
Enterprise	T1113	Screen Capture	AppleSeed can take screenshots on a compromised host by calling a series of APIs.[1]CitationKISA Operation Muzabi
Enterprise	T1204.002	Malicious File Sub-technique	AppleSeed can achieve execution through users running malicious file attachments distributed via email.[1]
Enterprise	T1074.001	Local Data Staging Sub-technique	AppleSeed can stage files in a central location prior to exfiltration.[1]
Enterprise	T1560.001	Archive via Utility Sub-technique	AppleSeed can zip and encrypt data collected on a target system.[1]
Enterprise	T1547.001	Registry Run Keys / Startup Folder Sub-technique	AppleSeed has the ability to create the Registry key name `EstsoftAutoUpdate` at `HKCU\Software\Microsoft/Windows\CurrentVersion\RunOnce` to establish persistence.[1]
Enterprise	T1025	Data from Removable Media	AppleSeed can find and collect data from removable media devices.[1]CitationKISA Operation Muzabi
Enterprise	T1124	System Time Discovery	AppleSeed can pull a timestamp from the victim's machine.[1]
Enterprise	T1218.010	Regsvr32 Sub-technique	AppleSeed can call regsvr32.exe for execution.[1]

Associated objects

Groups, software, and campaigns

G0094: Kimsuky

Kimsuky is a Democratic People's Republic of Korea (DPRK)-based cyber espionage group that has been active since at least 2012. The group initially targeted South Korean government agencies, think tanks, and subject-matter experts in various fields. Its operations expanded to include the United Nations and organizations in the government, education, business services, and manufacturing sectors across the United States, Japan, Russia, and Europe. Kimsuky has focused collection on foreign policy and national security issues tied to the Korean Peninsula, nuclear policy, and sanctions. Kimsuky operations have overlapped with those of other North Korean state-sponsored cyber espionage actors as a result of ad hoc collaborations or other limited resource sharing.[1][2][3][4][5][6]

Kimsuky was assessed to be responsible for the 2014 Korea Hydro & Nuclear Power Co. compromise; other notable campaigns include Operation STOLEN PENCIL (2018), Operation Kabar Cobra (2019), and Operation Smoke Screen (2019).[7][8][9] In 2023, Kimsuky was observed using commercial large language models (LLMs) to assist with vulnerability research, scripting, social engineering and reconnaissance.[10]

DPRK threat actor cluster boundaries overlap in open source reporting, with some security researchers consolidating all attributed North Korean state-sponsored cyber activity under Lazarus Group, rather than tracking operationally distinct subgroups.

Relationship explorer

All related ATT&CK context

Change history

Object version and sync metadata

The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .

ATT&CK release: 19.1
Object version: 1.1
Created: Jun 10, 2021, 14:53 UTC (UTC+00:00)
Modified: Apr 25, 2025, 14:42 UTC (UTC+00:00)
Raw hash: d9c650922faace63...

Imported snapshots across ATT&CK releases (1)

Release	Bundle imported	Object version	Modified	Status	Raw hash
19.1	Jun 3, 2026, 07:54 UTC (UTC+00:00)	1.1	Apr 25, 2025, 14:42 UTC (UTC+00:00)	Current bundle	`d9c650922faa…`

Raw source

Mirrored ATT&CK source object

The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.

Open mirrored raw JSON Open MITRE-hosted copy

Source references

External references and citations

MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.

[1]
Malwarebytes Kimsuky June 2021

Jazi, H. (2021, June 1). Kimsuky APT continues to target South Korean government using AppleSeed backdoor. Retrieved June 10, 2021.
Open source URL
[2]
mitre-attack S0622
Open source URL

Source and licensing

Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.

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Analyst context for executives and security teams