MalwareProfessional ServicesFinancial ServicesProfessional ServicesRansomwareStolen CredentialsData ExfiltratedRansom DemandedTargetedPIIIdentity (basic)MediumActive

ARTHUR J. GALLAGHER & CO.

bd_cd3444cd7307c619 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 26, 2020

Filed

Aug 16, 2021

To disclose

46 weeks

Affected

1,189state residents only

Linked

30 filings

Confidence

66%

Full breach record for ARTHUR J. GALLAGHER & CO. →31 incidents on file

Arthur J. Gallagher & Co. filed a supplemental notice with the New Hampshire Attorney General regarding a ransomware incident. The breach occurred between June 3 and September 26, 2020, and was detected on September 26, 2020. The incident affected approximately 1,189 New Hampshire residents, involving access to personal information. Gallagher 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 · 46 weeks / 324 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Aug 16, 2021

Filed

vs. sector median

+29 wks slower

This filing is one of 30 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

South Carolina State AGbd_46c22c0e135074c12021-08-17 · +1dVerified
Delaware State AGbd_4802bf691a0b05cf2021-08-17 · +1dVerified
South Carolina State AGbd_5a60d99cfc68d2f62021-08-17 · +1dVerified
Delaware State AGbd_d559ecce5b3385332021-08-19 · +3dVerified

Show 6 more filings ↓up to 49d gap

New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +7dVerified
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +22dVerified
South Carolina State AGbd_e1bf416a552091df2021-09-08 · +23dVerified
New Hampshire State AGbd_128a2682206fdf792021-09-13 · +28dVerified
South Carolina State AGbd_97dcb7179082a9e82021-09-30 · +45dVerified
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +49dVerified

Showing first 10 of 29 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: Aug 12, 2021
Affected individuals: 1,189state-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
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
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
Providing additional training to our employees on data privacy and security
Providing access, at no cost, to identity and credit monitoring services for twenty-four months through Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(324 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 AGAug 16 · first · this page

South Carolina State AG+1d

Delaware State AG+1d

South Carolina State AG+1d

Delaware State AG+3d

New Hampshire State AG+7d

New Hampshire State AG+22d

South Carolina State AG+23d

New Hampshire State AG+28d

South Carolina State AG+45d

New Hampshire State AG+49d

Pattern: first filing Aug 16 (NH), last Oct 4 (NH) — a 49-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 29 — 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-20210816.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 16, 2021
Raw hash: e39777b92a3398892b92a399bb26f18bf7c4686749d815066da51cba99739a30

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