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

ARTHUR J. GALLAGHER & CO.

bd_128a2682206fdf79 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Sep 13, 2021

To disclose

50 weeks

Affected

2state 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 NH AG regarding a ransomware incident detected on Sept 26, 2020. Unauthorized access occurred between June 3 and Sept 26, 2020. The notice covers 2 New Hampshire residents. 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 · 50 weeks / 352 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Sep 13, 2021

Filed

vs. sector median

+33 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_e1bf416a552091df2021-09-08 · +5dVerified
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +6dVerified
South Carolina State AGbd_97dcb7179082a9e82021-09-30 · +17dVerified
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +21dVerified

Show 6 more filings ↓up to 27d gap

New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +21dVerified
Delaware State AGbd_d559ecce5b3385332021-08-19 · +25dVerified
South Carolina State AGbd_46c22c0e135074c12021-08-17 · +27dVerified
Delaware State AGbd_4802bf691a0b05cf2021-08-17 · +27dVerified
South Carolina State AGbd_5a60d99cfc68d2f62021-08-17 · +27dVerified
South Carolina State AGbd_d8eb454e540101202021-08-17 · +27dVerified

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: Sep 8, 2021
Affected individuals: 2state-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 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
Ensured the ongoing security of our systems
Reported this incident to law enforcement and regulatory authorities
Provided access 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
Provided additional training to employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 50 weeks(352 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 ↗

South Carolina State AGAug 17 · first

Delaware State AGAug 17 · first

South Carolina State AGAug 17 · first

Delaware State AG+2d

New Hampshire State AG+6d

New Hampshire State AG+21d

South Carolina State AG+22d

New Hampshire State AG+27d · this page

South Carolina State AG+44d

New Hampshire State AG+48d

Pattern: first filing Aug 17 (SC), last Oct 4 (NH) — a 48-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-20210913.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 13, 2021
Raw hash: 1dc4b59485b9cfbe1e43332ca17eb04522f70b6fa9c81423bb90b938db12164c

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