MalwareData EncryptedCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)Government IDMediumContained

ARTHUR J. GALLAGHER & CO.

bd_4802bf691a0b05cf · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 26, 2020

Filed

Aug 17, 2021

To disclose

46 weeks

Affected

Not disclosed

Linked

30 filings

Confidence

65%

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

Arthur J. Gallagher & Co. filed a supplemental notice with the Delaware Attorney General regarding a ransomware incident detected on September 26, 2020. The attack occurred between June 3, 2020, and September 26, 2020, impacting internal systems. The company took systems offline, engaged forensic specialists, and notified law enforcement. The breach affected individuals' personal information, including names and government IDs. The company offered 24 months of credit monitoring via Kroll. This is the 6th supplemental notice, indicating ongoing identification of affected residents.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 46 weeks / 325 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Aug 17, 2021

Filed

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_46c22c0e135074c12021-08-17Verified
South Carolina State AGbd_5a60d99cfc68d2f62021-08-17Verified
South Carolina State AGbd_d8eb454e540101202021-08-17Verified
Delaware State AGbd_d559ecce5b3385332021-08-19 · +2dVerified

Show 6 more filings ↓up to 48d gap

New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +6dVerified
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +21dVerified
South Carolina State AGbd_e1bf416a552091df2021-09-08 · +22dVerified
New Hampshire State AGbd_128a2682206fdf792021-09-13 · +27dVerified
South Carolina State AGbd_97dcb7179082a9e82021-09-30 · +44dVerified
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +48dVerified

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

Discovered: Sep 26, 2020
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Undetected for: 115 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 17, 2021
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1119 Automated Collection
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 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: 46 weeks(325 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 · this page

Delaware State AG+2d

New Hampshire State AG+6d

New Hampshire State AG+21d

South Carolina State AG+22d

New Hampshire State AG+27d

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://attorneygeneral.delaware.gov/wp-content/uploads/sites/50/2021/09/2021-8-17-AJG-DE-6th-Supplemental-Notice-to-DE-Residents.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 17, 2021
Raw hash: f6cc617619963cc678d6afad2d7fef0b470afa49c87b6acdb17772493ccfef66

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