MalwareProfessional ServicesProfessional ServicesRansomwareData EncryptedTargetedPIIIdentity (basic)LowActive

ARTHUR J. GALLAGHER & CO.

bd_e05a56a536c799dd · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Sep 7, 2021

To disclose

49 weeks

Affected

690state residents only

Linked

41 filings

Confidence

66%

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

Arthur J. Gallagher & Co. filed a supplemental notice to the NH AG regarding a September 2020 ransomware event. Unauthorized access occurred between June 3 and September 26, 2020. The company notified approximately 690 NH residents and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 49 weeks / 346 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Sep 7, 2021

Filed

vs. sector median

+30 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

Maine State AGbd_c453899ab04861cb2021-09-08 · +1dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +6dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +6dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +15dVerified by operator

Show 6 more filings ↓up to 94d gap

Delaware State AGbd_d559ecce5b3385332021-08-19 · +19dVerified by operator
Maine State AGbd_45e73c05af0477862021-08-17 · +21dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +22dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +27dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +90dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +94dVerified

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: Sep 1, 2021
Affected individuals: 690state-resident count only
Data types: PIIIdentity (basic)
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, as required by law

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 and 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: 49 weeks(346 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 · 3 states

View merged incident ↗

Maine State AGAug 17 · first

Delaware State AG+2d

New Hampshire State AG+6d

Maine State AG+15d

New Hampshire State AG+21d · this page

Maine State AG+22d

Maine State AG+27d

Maine State AG+43d

New Hampshire State AG+48d

Maine State AG+111d

New Hampshire State AG+115d

Pattern: first filing Aug 17 (ME), last Dec 10 (NH) — a 115-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://mm.nh.gov/files/uploads/doj/remote-docs/arthur-j-gallagher-20210907.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 7, 2021
Raw hash: cbeadf0c6ed3efe08c7d42eb2cc69317f008527fb4265aaed6954de78d78ab44

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 provenancemm.nh.gov