MalwareProfessional ServicesProfessional ServicesRansomwareData ExfiltratedRansom DemandedPIIIdentity (basic)MediumContained

ARTHUR J. GALLAGHER & CO.

bd_bce83370d3617e73 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 26, 2020

Filed

Jul 21, 2021

To disclose

43 weeks

Affected

1,770state residents only

Linked

41 filings

Confidence

65%

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

Arthur J. Gallagher & Co. notified Montana residents of a ransomware incident detected on September 26, 2020. Unauthorized access occurred between June 3 and September 26, 2020. The breach impacted PII. The company engaged forensic specialists, notified law enforcement, and provided 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 43 weeks / 298 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jul 21, 2021

Filed

vs. sector median

+23 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 · +29dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +33dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +42dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +48dVerified by operator

Show 6 more filings ↓up to 142d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +49dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +54dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +70dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +75dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +138dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +142dVerified

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: Professional Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 26, 2020
Affected individuals: 1,770state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: reported this incident to law enforcement and regulatory authorities

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
Reported this incident to law enforcement and regulatory authorities
Providing you access, at no cost, to identity and credit monitoring services for twenty-four months through Kroll
Changes made: Reviewed existing security policies
Implemented additional measures and enhanced security tools
Implemented additional safeguards
Providing additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 43 weeks(298 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 4 states

View merged incident ↗

Montana State AGJul 21 · first · this page

Delaware State AG+29d

New Hampshire State AG+33d

Maine State AG+42d

New Hampshire State AG+48d

Maine State AG+49d

Maine State AG+54d

Maine State AG+70d

New Hampshire State AG+75d

Maine State AG+138d

New Hampshire State AG+142d

Pattern: first filing Jul 21 (MT), last Dec 10 (NH) — a 142-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://dojmt.gov/wp-content/uploads/OCP/a-notif-103.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 21, 2021
Raw hash: b0887bdc425e295ed78975c43cb75f451359fa39938d49df620698ef910dc0bb

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

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov