MITRE ATT&CK T0865: Spearphishing Attachment
When to use this skill
Use this skill when the task involves T0865, Spearphishing Attachment, ics ATT&CK, TTP mapping, detection engineering, hunting, incident-response enrichment, control validation, or authorized adversary-emulation planning. Treat it as a defensive analysis aid: keep outputs focused on understanding, detecting, mitigating, and safely validating this ATT&CK technique.
Technique context
- ATT&CK domain: ics
- ATT&CK ID: T0865
- Technique name: Spearphishing Attachment
- Type: technique
- ATT&CK URL: https://attack.mitre.org/techniques/T0865
- Tactics: initial-access
- Platforms: None
- Required permissions: Not specified
- Effective permissions: Not specified
- Defenses bypassed: Not specified
ATT&CK description
Adversaries may use a spearphishing attachment, a variant of spearphishing, as a form of a social engineering attack against specific targets. Spearphishing attachments are different from other forms of spearphishing in that they employ malware attached to an email. All forms of spearphishing are electronically delivered and target a specific individual, company, or industry. In this scenario, adversaries attach a file to the spearphishing email and usually rely upon User Execution to gain execution and access. (Citation: Enterprise ATT&CK October 2019)
A Chinese spearphishing campaign running from December 9, 2011 through February 29, 2012, targeted ONG organizations and their employees. The emails were constructed with a high level of sophistication to convince employees to open the malicious file attachments. (Citation: CISA AA21-201A Pipeline Intrusion July 2021)
Agent workflow
- Clarify scope: identify the system, asset class, log sources, cloud or endpoint platform, and whether the user wants triage, detection, coverage assessment, or safe emulation planning.
- Load bundled resources as needed: use
references/technique-profile.json for structured metadata, references/detection-and-mitigation.md for triage and telemetry guidance, references/known-threat-context.md for ATT&CK relationship context, and templates/ for repeatable outputs.
- Map observations to ATT&CK: compare the user's evidence to the ATT&CK description, tactics, platforms, and known procedure patterns before asserting a match.
- Produce defensive outputs: prioritize hypotheses, telemetry requirements, detection logic ideas, validation steps, containment guidance, and mitigations.
- Preserve uncertainty: distinguish confirmed evidence, plausible indicators, assumptions, and gaps. Recommend what to collect next.
- Stay safe: do not provide malware, credential theft, persistence, evasion, destructive automation, or unauthorized exploitation instructions. For adversary emulation, keep steps bounded to approved lab or control-validation contexts and omit operational abuse details.
Bundled resources
references/technique-profile.json: machine-readable ATT&CK metadata for this technique.references/detection-and-mitigation.md: detection notes, telemetry checklist, triage questions, mitigation candidates, and false-positive considerations.references/known-threat-context.md: ATT&CK relationship context with attribution cautions.templates/detection-brief.md: detection engineering brief template.templates/hunt-plan.md: threat hunt plan template.templates/incident-response-note.md: incident response note template.templates/coverage-assessment.md: ATT&CK coverage assessment template.scripts/render_brief.py: local helper that renders a Markdown defensive brief from technique-profile.json.assets/output-schema.json: JSON schema for structured technique analysis outputs.
To generate a quick brief, run python scripts/render_brief.py --output brief.md from inside this skill directory, or adapt the templates directly.
Detection guidance
No ATT&CK detection guidance was present in the source STIX object.
Useful telemetry and data sources
- Not specified in the STIX object.
Mitigations to consider
- Antivirus/Antimalware
- Network Intrusion Prevention
- Restrict Web-Based Content
- User Training
Known threat context
Use these examples only as contextual leads, not as proof that an observed event is this technique:
- ALLANITE (intrusion-set)
- APT33 (intrusion-set)
- Backdoor.Oldrea (malware)
- BlackEnergy (malware)
- Lazarus Group (intrusion-set)
- OilRig (intrusion-set)
Recommended output pattern
When responding with this skill, structure the answer as:
- Assessment: whether the evidence supports this ATT&CK mapping and why.
- Evidence: specific indicators, logs, behaviors, and assumptions.
- Detection: telemetry sources, analytic logic, and tuning considerations.
- Response: containment, eradication, recovery, and validation actions.
- Coverage gaps: missing logs, sensors, controls, or environmental details.
- References: include the ATT&CK URL and any user-provided evidence references.
1---2name: attack-ics-t0865-spearphishing-attachment3description: Analyze MITRE ATT&CK T0865 Spearphishing Attachment in the ics matrix. Use for TTP triage, detection engineering, hunting, defensive emulation planning, mitigations, incident response mapping, ATT&CK coverage, or questions mentioning T0865, Spearphishing Attachment, or ics ATT&CK. Adversaries may use a spearphishing attachment, a variant of spearphishing, as a form of a social engineering attack against specific targets.4license: MITRE ATT&CK Terms of Use apply to ATT&CK-derived content. See h5---67# MITRE ATT&CK T0865: Spearphishing Attachment89## When to use this skill1011Use this skill when the task involves T0865, Spearphishing Attachment, ics ATT&CK, TTP mapping, detection engineering, hunting, incident-response enrichment, control validation, or authorized adversary-emulation planning. Treat it as a defensive analysis aid: keep outputs focused on understanding, detecting, mitigating, and safely validating this ATT&CK technique.1213## Technique context1415- ATT&CK domain: ics16- ATT&CK ID: T086517- Technique name: Spearphishing Attachment18- Type: technique19- ATT&CK URL: https://attack.mitre.org/techniques/T086520- Tactics: initial-access21- Platforms: None22- Required permissions: Not specified23- Effective permissions: Not specified24- Defenses bypassed: Not specified2526## ATT&CK description2728Adversaries may use a spearphishing attachment, a variant of spearphishing, as a form of a social engineering attack against specific targets. Spearphishing attachments are different from other forms of spearphishing in that they employ malware attached to an email. All forms of spearphishing are electronically delivered and target a specific individual, company, or industry. In this scenario, adversaries attach a file to the spearphishing email and usually rely upon [User Execution](https://attack.mitre.org/techniques/T0863) to gain execution and access. (Citation: Enterprise ATT&CK October 2019) 2930A Chinese spearphishing campaign running from December 9, 2011 through February 29, 2012, targeted ONG organizations and their employees. The emails were constructed with a high level of sophistication to convince employees to open the malicious file attachments. (Citation: CISA AA21-201A Pipeline Intrusion July 2021)3132## Agent workflow33341. Clarify scope: identify the system, asset class, log sources, cloud or endpoint platform, and whether the user wants triage, detection, coverage assessment, or safe emulation planning.352. Load bundled resources as needed: use `references/technique-profile.json` for structured metadata, `references/detection-and-mitigation.md` for triage and telemetry guidance, `references/known-threat-context.md` for ATT&CK relationship context, and `templates/` for repeatable outputs.363. Map observations to ATT&CK: compare the user's evidence to the ATT&CK description, tactics, platforms, and known procedure patterns before asserting a match.374. Produce defensive outputs: prioritize hypotheses, telemetry requirements, detection logic ideas, validation steps, containment guidance, and mitigations.385. Preserve uncertainty: distinguish confirmed evidence, plausible indicators, assumptions, and gaps. Recommend what to collect next.396. Stay safe: do not provide malware, credential theft, persistence, evasion, destructive automation, or unauthorized exploitation instructions. For adversary emulation, keep steps bounded to approved lab or control-validation contexts and omit operational abuse details.4041## Bundled resources4243- `references/technique-profile.json`: machine-readable ATT&CK metadata for this technique.44- `references/detection-and-mitigation.md`: detection notes, telemetry checklist, triage questions, mitigation candidates, and false-positive considerations.45- `references/known-threat-context.md`: ATT&CK relationship context with attribution cautions.46- `templates/detection-brief.md`: detection engineering brief template.47- `templates/hunt-plan.md`: threat hunt plan template.48- `templates/incident-response-note.md`: incident response note template.49- `templates/coverage-assessment.md`: ATT&CK coverage assessment template.50- `scripts/render_brief.py`: local helper that renders a Markdown defensive brief from `technique-profile.json`.51- `assets/output-schema.json`: JSON schema for structured technique analysis outputs.5253To generate a quick brief, run `python scripts/render_brief.py --output brief.md` from inside this skill directory, or adapt the templates directly.5455## Detection guidance5657No ATT&CK detection guidance was present in the source STIX object.5859## Useful telemetry and data sources6061- Not specified in the STIX object.6263## Mitigations to consider6465- Antivirus/Antimalware66- Network Intrusion Prevention67- Restrict Web-Based Content68- User Training6970## Known threat context7172Use these examples only as contextual leads, not as proof that an observed event is this technique:7374- ALLANITE (intrusion-set)75- APT33 (intrusion-set)76- Backdoor.Oldrea (malware)77- BlackEnergy (malware)78- Lazarus Group (intrusion-set)79- OilRig (intrusion-set)8081## Recommended output pattern8283When responding with this skill, structure the answer as:8485- Assessment: whether the evidence supports this ATT&CK mapping and why.86- Evidence: specific indicators, logs, behaviors, and assumptions.87- Detection: telemetry sources, analytic logic, and tuning considerations.88- Response: containment, eradication, recovery, and validation actions.89- Coverage gaps: missing logs, sensors, controls, or environmental details.90- References: include the ATT&CK URL and any user-provided evidence references.
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