MalwareFinancial ServicesFinanceRansomwareData EncryptedCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Government IDLowContained

ARTHUR J. GALLAGHER & CO.

bd_39df0229d122d42b · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 26, 2020

Filed

Jul 21, 2021

To disclose

43 weeks

Affected

Not disclosed

Linked

30 filings

Confidence

66%

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

Arthur J. Gallagher & Co. issued a supplemental data breach notification to Delaware residents regarding a ransomware incident detected on September 26, 2020. The breach impacted systems between June 3 and September 26, 2020, resulting in the unauthorized access of personal information. Gallagher engaged forensic specialists, notified law enforcement, and provided 24 months of credit monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 43 weeks / 298 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jul 21, 2021

Filed

vs. sector median

+34 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 · +27dVerified
Delaware State AGbd_4802bf691a0b05cf2021-08-17 · +27dVerified
South Carolina State AGbd_5a60d99cfc68d2f62021-08-17 · +27dVerified
Delaware State AGbd_d559ecce5b3385332021-08-19 · +29dVerified

Show 6 more filings ↓up to 75d gap

New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +33dVerified
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +48dVerified
South Carolina State AGbd_e1bf416a552091df2021-09-08 · +49dVerified
New Hampshire State AGbd_128a2682206fdf792021-09-13 · +54dVerified
South Carolina State AGbd_97dcb7179082a9e82021-09-30 · +71dVerified
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +75dVerified

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: Financial Servicesllm

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: reported this incident to law enforcement and regulatory authorities

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
Providing you access, at no cost, 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
Providing additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 43 weeks(298 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 ↗

Delaware State AGJul 21 · first · this page

South Carolina State AG+27d

Delaware State AG+27d

South Carolina State AG+27d

Delaware State AG+29d

New Hampshire State AG+33d

New Hampshire State AG+48d

South Carolina State AG+49d

New Hampshire State AG+54d

South Carolina State AG+71d

New Hampshire State AG+75d

Pattern: first filing Jul 21 (DE), last Oct 4 (NH) — a 75-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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2021/08/3-AJG-DE-Supplemental-Notice.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 21, 2021
Raw hash: 8f252e22316bccffe769f2dfa6104a78a27b3e1fbd59c900a1c28a899f5f6088

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 provenanceattorneygeneral.delaware.gov