FEDERALItem 1.05 · mandatoryHackingTechnologyInformationSoftwareStolen CredentialsCapture Stored DataMidnight BlizzardActor NamedNation State SuspectedTargetedMulti-Stage ChainLateral Movement ObservedData ExfiltratedEmployee Data InvolvedIP / systemCredentialsMetadataLowActive

MICROSOFT CORPORATION

bd_bfb10eaec0a6e100 · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Mar 8, 2024

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

88%

Full breach record for MICROSOFT CORPORATION →2 incidents on file

Microsoft filed an 8-K/A amending its January 19, 2024 disclosure of a cybersecurity incident attributed to nation-state threat actor Midnight Blizzard. Beginning in late November 2023, the actor accessed and exfiltrated information from a small percentage of corporate email accounts, including senior leadership, cybersecurity, and legal personnel. Microsoft has since determined the actor used that information to attempt unauthorized access to source code repositories and internal systems. Investigation remains active.

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SEC clockMateriality determined Jan 17, 2024 → Filed Mar 8, 202451d ✗ SEC 4-day late

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline

Nov 1, 2023

Begins

Jan 17, 2024

Scope determined

Mar 8, 2024

Filed

This filing is one of 2 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

SEC 8-KMidnight Blizzardbd_d660c617b3363d6d2024-01-19 · +49dCandidate

Name: MICROSOFT CORPORATION
norm: microsoft
SEC CIK: 0000789019
Domain: microsoft.com

Name: MICROSOFT CORPORATION
norm: microsoft
SEC CIK: 0000789019
Domain: microsoft.com
Industry: Technologyllm
NAICS 513210 · Software Publishers

Discovered: —
Breach occurred: Nov 1, 2023
Materiality determined: Jan 17, 2024
Notification sent: —
Affected individuals: Not disclosed
Data types: IP / systemCredentialsMetadata
Attack vector: Unauthorized Access· Midnight Blizzard
MITRE ATT&CK: T1078 Valid AccountsT1114 Email CollectionT1041 Exfiltration Over C2 Channel
Threat actor: Midnight BlizzardExternalEspionage
Regulator citations: Coordinating with federal law enforcement on ongoing investigation
Initial access: valid_credentials

During the incident: Increased security investments
Cross-enterprise coordination and mobilization
Enhanced ability to defend against the advanced persistent threat
Continuing to coordinate with federal law enforcement
Active investigations of threat actor's activities ongoing
Changes made: Secure and harden environment against advanced persistent threat
Source: Quoted from the filing itself, not independently verified.

Compliance flags: SEC 4-day late · 51d
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
SEC
Materiality determined: Jan 17, 2024
→ Filed: Mar 8, 2024
51d cal. 4 business days SEC 4-day late

Statute	Window	Elapsed	Threshold	Status
SEC	Materiality determined: Jan 17, 2024 → Filed: Mar 8, 2024	51d cal.	4 business days	SEC 4-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings

View merged incident ↗

SEC 8-KJan 19 · first

SEC 8-K+49d · this page

Pattern: first filing Jan 19, last Mar 8 — a 49-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/789019/000119312524062997/d808756d8ka.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Mar 8, 2024
Raw hash: 66ef5cb0574479ded15b1de0f56366c1de45dc3ec8d3c7bc7c5415dcf34edd96

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Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMICROSOFT CORPORATION

Victim entityMICROSOFT CORPORATION

IncidentUnauthorized Access

Stated responseIncreased security investments

ComplianceSEC 4-day late

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing