- AN0147 · Analytic 0147 — Sequence of internal email sent from a recently compromised user account (preceded by abnormal logon or device activity), with attachments or links leading to execution or credential harvesting. Defender observes: internal mail delivery to peers with high entropy attachments, followed by click events, process initiation, or credential prompts.
- AN0148 · Analytic 0148 — Delivery of suspicious internal communication (e.g., Thunderbird, Evolution) using compromised internal accounts. Sequence of: unexpected user activity + mail transfer logs + download or execution of attachments.
- AN0149 · Analytic 0149 — Abnormal Apple Mail use, including internal email relays followed by file execution or script events (e.g., attachments launched via Preview, terminal triggered from Mail.app)
- AN0150 · Analytic 0150 — Internal spearphishing via SaaS applications (e.g., Slack, Teams, Gmail): message sent from compromised user with attachment or URL, followed by click and credential access behavior.
- AN0151 · Analytic 0151 — Outlook or Word used to forward suspicious internal attachments with macro content. Defender observes attachment forwarding, auto-opening behaviors, or macro prompt interactions.
AdversaryGraph public intelligence page
This page is part of Threat Matrix, the public browser workspace for the main AdversaryGraph platform. Use it for ATT&CK pivots, actor and technique context, similarity leads, detection coverage review, and analyst-ready investigation paths.
Validation disclaimer: TTP overlap, actor similarity, generated summaries, and coverage findings are investigation leads, not attribution proof or operational validation without analyst review.
Main AdversaryGraph project Documentation Malware Analysis GitHub
Internal Spearphishing
After they already have access to accounts or systems within the environment, adversaries may use internal spearphishing to gain access to additional information or compromise other users within the same organization. Internal spearphishing is multi-staged campaign where a legitimate account is initially compromised either by controlling the user's device or by compromising the account credentials of the user. Adversaries may then attempt to take advantage of the trusted internal account to increase the likelihood of tricking more victims into falling for phish attempts, often incorporating Impersonation. For example, adversaries may leverage Spearphishing Attachment or Spearphishing Link as part of internal spearphishing to deliver a payload or redirect to an external site to capture credentials through Input Capture on sites that mimic login interfaces. Adversaries may also leverage internal chat apps, such as Microsoft Teams, to spread malicious content or engage users in attempts to capture sensitive information and/or credentials.
Open detection, hunting, mitigation, and evidence workspace
Detection logic
Network intrusion detection systems and email gateways usually do not scan internal email, but an organization can leverage the journaling-based solution which sends a copy of emails to a security service for offline analysis or incorporate service-integrated solutions using on-premise or API-based integrations to help detect internal spearphishing campaigns.
Observed actors
Correlated CTI and IR reports
Cyber Knowledge context
Use these routes to move from the ATT&CK behavior into explanation, implementation, evidence handling, validation, and defensive operations. Relevance is generated from explicit identifiers/names and governed topic mappings; it is not attribution evidence.
Module 6 — Active Directory and identity attack paths
Red Team & Offensive Security · Tactic learning route · 24/100Module 5 — Threat hunting
Blue Team & Defensive Security · Tactic learning route · 24/100Data classification, storage, cryptography, keys, backup, and deletion
Cloud Security · Tactic learning route · 24/100
Red Team & Offensive Security · Tactic learning route · 24/100Module 5 — Threat hunting
Blue Team & Defensive Security · Tactic learning route · 24/100Data classification, storage, cryptography, keys, backup, and deletion
Cloud Security · Tactic learning route · 24/100
MITRE mitigations
No ATT&CK mitigation relationship is published for this technique. Apply risk-based controls and verify scope.