MalwareFinancial ServicesProfessional ServicesFinanceRansomwareStolen CredentialsMulti-Stage ChainDelayed DiscoveryCustomer Data InvolvedPIIIdentity (basic)LowContained

ARTHUR J. GALLAGHER & CO.

bd_0995d36ed3507f49 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Dec 10, 2021

To disclose

15 months

Affected

1state 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 notice covers approximately 1 New Hampshire resident. Data types included 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 · 15 months / 440 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Dec 10, 2021

Filed

vs. sector median

+55 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_2831d3281e5d09eb2021-12-06 · +4dCandidate
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +67dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +72dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +88dVerified by operator

Show 6 more filings ↓up to 115d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +93dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +94dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +100dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +109dVerified by operator
Delaware State AGbd_d559ecce5b3385332021-08-19 · +113dVerified by operator
Maine State AGbd_45e73c05af0477862021-08-17 · +115dVerified by operator

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 ServicesllmProfessional Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 30, 2021
Affected individuals: 1state-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
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
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 and are providing additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 15 months(440 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

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 · this page

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-20211210.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 10, 2021
Raw hash: 2bf8cae083f2442cea620ad0e019f3d57dc1a628164f4cb6bed8aa07207c6067

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