MalwareFinancial ServicesFinanceRansomwareData ExfiltratedMulti-Stage ChainDelayed DiscoveryFinancial accountIdentity (basic)Government IDPHIPIIHealth (basic)HighActive

ARTHUR J. GALLAGHER & CO.

bd_c93c3a36f7ed4fc7 · schema v1 · pii pii-v1

Severity

High

Discovered

Sep 26, 2020

Filed

Jul 13, 2021

To disclose

41 weeks

Affected

72,378state residents only

Linked

41 filings

Confidence

69%

Full breach record for ARTHUR J. GALLAGHER & CO. →14 incidents on file

Arthur J. Gallagher & Co. reported a supplemental notice of a ransomware event detected on September 26, 2020. Unauthorized access occurred between June 3, 2020, and September 26, 2020. The incident impacted approximately 72,378 Washington residents. Data accessed included PII and government identifiers. The company engaged forensic specialists, took systems offline, and provided 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Washington clock✗ WA AG >90d41 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 115 days

discovery → filing · 41 weeks / 290 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jul 13, 2021

Filed

vs. sector median

+33 wks slower

This filing is one of 41 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Delaware State AGbd_d559ecce5b3385332021-08-19 · +37dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +41dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +50dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +56dVerified by operator

Show 6 more filings ↓up to 150d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +57dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +62dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +78dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +83dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +146dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +150dVerified

Showing first 10 of 40 linked disclosures.

Name: ARTHUR J. GALLAGHER & CO.
norm: arthur j gallagher

Name: ARTHUR J. GALLAGHER & CO.
norm: arthur j gallagher
Industry: Financial Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 26, 2021
Affected individuals: 72,378state-resident count only
Data types: Financial accountIdentity (basic)Government IDPHIPII
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthHealth insurance IDMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 100-199dexposure 100-199d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Reported this incident to law enforcement and regulatory authorities
Initial access: valid_credentials

During the incident: Took all our systems offline as a precautionary measure
Initiated response protocols
Launched an investigation with the assistance of third-party cybersecurity and forensic specialists
Implemented our business continuity plans to minimize disruption to our customers
Ensured the ongoing security of our systems
Conducted an extensive review of the entire contents of the impacted systems
Reviewed existing security policies and implemented additional measures and enhanced security tools
Implemented additional safeguards and provided additional training to our employees on data privacy and security
Reported this incident to law enforcement and regulatory authorities
Provided access to identity and credit monitoring services for twenty-four months through Kroll
Changes made: Reviewed existing security policies and implemented additional measures and enhanced security tools
Implemented additional safeguards and provided additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 41 weeks(290 days from discovery to filing)
Compliance flags: WA AG >90d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 4 states

View merged incident ↗

Washington State AGJul 13 · first · this page

Delaware State AG+37d

New Hampshire State AG+41d

Maine State AG+50d

New Hampshire State AG+56d

Maine State AG+57d

Maine State AG+62d

Maine State AG+78d

New Hampshire State AG+83d

Maine State AG+146d

New Hampshire State AG+150d

Pattern: first filing Jul 13 (WA), last Dec 10 (NH) — a 150-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 40 — the full spread may be wider.

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 filingThis record

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

SEC 8-K / victim statement

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

Source URL: https://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM10497.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 13, 2021
Raw hash: 5f8de54d49c26f1ac5e76437187a5306f8e73c447337320f8bbc6fbdfc19b099

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityARTHUR J. GALLAGHER & CO.

Victim entityARTHUR J. GALLAGHER & CO.

Incidentdiscovered Sep 26, 2020

Stated responseTook all our systems offline as a precautionary measure

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com