MalwareProfessional ServicesFinancial ServicesProfessional ServicesRansomwareStolen CredentialsData ExfiltratedRansom DemandedDelayed DiscoveryPIIIdentity (basic)LowActive

ARTHUR J. GALLAGHER & CO.

bd_b23e7ec4b797d9a4 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Jul 22, 2021

To disclose

43 weeks

Affected

157state 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 with the New Hampshire AG regarding a ransomware incident detected on September 26, 2020. Unauthorized access occurred between June 3 and September 26, 2020. The breach affected approximately 157 New Hampshire residents, involving PII. The company engaged forensic specialists, took systems offline, 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 / 299 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jul 22, 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 · +28dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +32dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +41dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +47dVerified by operator

Show 6 more filings ↓up to 141d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +48dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +53dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +69dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +74dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +137dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +141dVerified

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 ServicesllmFinancial Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 16, 2021
Affected individuals: 157state-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: Notified Office of the New Hampshire Attorney General
Initial access: valid_credentials

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

Time to disclose: 43 weeks(299 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 ↗

New Hampshire State AGJul 22 · first · this page

Delaware State AG+28d

New Hampshire State AG+32d

Maine State AG+41d

New Hampshire State AG+47d

Maine State AG+48d

Maine State AG+53d

Maine State AG+69d

New Hampshire State AG+74d

Maine State AG+137d

New Hampshire State AG+141d

Pattern: first filing Jul 22 (NH), last Dec 10 (NH) — a 141-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-20210722.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 22, 2021
Raw hash: 748c573997017412bffe84889f1d7965d1ef1019a025c1fc0823580e1164aa33

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 systems offline as a precautionary measure

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov