S0355: Final1stspy
Final1stspy is a dropper family that has been used to deliver DOGCALL.[1]
Security context for executives and security teams
S0355: Final1stspy describes [Final1stspy](https://attack.mitre.org/software/S0355) is a dropper family that has been used to deliver [DOGCALL](https://attack.mitre.org/software/S0213).(Citation: Unit 42 Nokki Oct 2018)
Executive priority
S0355: Final1stspy is an official MITRE ATT&CK software. Glexia treats it as defensive behavior context for prioritizing monitoring, control validation, and response planning without using the object by itself as an attribution claim.
Technical view
Security teams should validate S0355: Final1stspy by reviewing the official ATT&CK relationships, mapped tactics (the mapped ATT&CK tactic context), supported platforms (Windows), and available local telemetry before making detection or mitigation decisions.
Likely telemetry
- Official ATT&CK relationships and object metadata
- Network, endpoint, and security-tool telemetry
Detection direction
- Validate whether S0355: Final1stspy appears in your detection coverage and tabletop scenarios.
- Use the object to align executive risk language with SOC, incident response, and detection engineering work.
- Do not treat ATT&CK relationship context as attribution without corroborating evidence.
Mitigation priorities
- Map the object to existing controls and identify missing telemetry or response ownership.
- Prioritize mitigations that reduce exposure on the listed platforms and tactics.
- Review adjacent ATT&CK relationships before changing policy, detections, or reporting language.
Additional notes and limits
Baseline Glexia take generated from the official MITRE ATT&CK STIX object, source hash, tactics, platforms, and detection fields. It is safe to replace with a richer model-generated take for the same source hash later.
This baseline take is source-grounded and schema-validated, but it does not include environment-specific telemetry, incident evidence, or threat-intelligence corroboration.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Final1stspy
Final1stspy is a dropper family that has been used to deliver DOGCALL.[1]
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.
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.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1547.001 | Registry Run Keys / Startup FolderSub-technique | Final1stspy creates a Registry Run key to establish persistence.[1] |
| Enterprise | T1140 | Deobfuscate/Decode Files or Information | Final1stspy uses Python code to deobfuscate base64-encoded strings.[1] |
| Enterprise | T1027 | Obfuscated Files or Information | Final1stspy obfuscates strings with base64 encoding.[1] |
| Enterprise | T1057 | Process Discovery | Final1stspy obtains a list of running processes.[1] |
| Enterprise | T1082 | System Information Discovery | Final1stspy obtains victim Microsoft Windows version information and CPU architecture.[1] |
| Enterprise | T1071.001 | Web ProtocolsSub-technique | Final1stspy uses HTTP for C2.[1] |
Groups, software, and campaigns
G0067: APT37
APT37 is a North Korean state-sponsored cyber espionage group that has been active since at least 2012. The group has targeted victims primarily in South Korea, but also in Japan, Vietnam, Russia, Nepal, China, India, Romania, Kuwait, and other parts of the Middle East. APT37 has also been linked to the following campaigns between 2016-2018: Operation Daybreak, Operation Erebus, Golden Time, Evil New Year, Are you Happy?, FreeMilk, North Korean Human Rights, and Evil New Year 2018.[1][2][3]
North Korean group definitions are known to have significant overlap, and some security researchers report all North Korean state-sponsored cyber activity under the name Lazarus Group instead of tracking clusters or subgroups.
All related ATT&CK context
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.
Imported snapshots across ATT&CK releases(2)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.2 | 1.1 | Current bundle | 24a449bdd6e7… | ||
| 19.1 | 1.1 | Older bundle | 24a449bdd6e7… |
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.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
- [1]Unit 42 Nokki Oct 2018
Grunzweig, J. (2018, October 01). NOKKI Almost Ties the Knot with DOGCALL: Reaper Group Uses New Malware to Deploy RAT. Retrieved November 5, 2018.
Open source URL - [2]Final1stspy
(Citation: Unit 42 Nokki Oct 2018)
- [3]mitre-attackS0355Open source URL
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