MalwareFinancial ServicesProfessional ServicesFinanceRansomwareData ExfiltratedData EncryptedTargetedIdentity (basic)Government IDFinancial accountHealth (basic)AuthenticationMediumContained

ARTHUR J. GALLAGHER & CO.

bd_be995156e3de2c7b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 26, 2020

Filed

Jul 6, 2021

To disclose

40 weeks

Affected

13state residents only

Linked

41 filings

Confidence

66%

Full breach record for ARTHUR J. GALLAGHER & CO. →14 incidents on file

Arthur J. Gallagher & Co. reported a ransomware event detected on September 26, 2020. Unauthorized access occurred between June 3 and September 26, 2020. Impacted data included names, SSNs, driver's licenses, financial account info, and medical data. 13 New Hampshire residents were notified on June 30, 2021. Credit monitoring offered.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 115 days

discovery → filing · 40 weeks / 283 days

Jun 3, 2020

Begins

Sep 26, 2020

Discovered

Jul 6, 2021

Filed

vs. sector median

+32 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

Delaware State AGbd_d559ecce5b3385332021-08-19 · +44dVerified by operator
New Hampshire State AGbd_7a32a3fe8539d6192021-08-23 · +48dVerified by operator
Maine State AGbd_a45fd1cf66fc40d52021-09-01 · +57dVerified by operator
New Hampshire State AGbd_e05a56a536c799dd2021-09-07 · +63dVerified by operator

Show 6 more filings ↓up to 157d gap

Maine State AGbd_c453899ab04861cb2021-09-08 · +64dVerified by operator
Maine State AGbd_29bb498af183cd332021-09-13 · +69dVerified by operator
Maine State AGbd_d79b29bc558a3c712021-09-29 · +85dVerified by operator
New Hampshire State AGbd_544b44357c05bc6c2021-10-04 · +90dVerified by operator
Maine State AGbd_2831d3281e5d09eb2021-12-06 · +153dCandidate
New Hampshire State AGbd_0995d36ed3507f492021-12-10 · +157dVerified

Showing first 10 of 40 linked disclosures.

Name: Mullen Coughlin LLC
norm: mullen coughlin

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: 13state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)Authentication
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified the Office of the New Hampshire Attorney General

During the incident: Took systems offline as a precautionary measure
Initiated response protocols
Launched an investigation with the assistance of third-party cybersecurity and forensic investigators
Implemented business continuity plans
Notified law enforcement and is cooperating with their investigation
Providing access to credit monitoring services for twenty-four months through Kroll
Changes made: Implemented additional safeguards and enhanced security tools to the Gallagher network
Reviewed existing security policies
Providing additional training to employees regarding cybersecurity
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 40 weeks(283 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 AGJul 6 · first · this page

Delaware State AG+44d

New Hampshire State AG+48d

Maine State AG+57d

New Hampshire State AG+63d

Maine State AG+64d

Maine State AG+69d

Maine State AG+85d

New Hampshire State AG+90d

Maine State AG+153d

New Hampshire State AG+157d

Pattern: first filing Jul 6 (NH), last Dec 10 (NH) — a 157-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-20210706.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 6, 2021
Raw hash: f1a6d8b22d6d5e0ba8e6ef3bab5b5f165d73a4d06824a364a7c74c7ae6759ef0

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityARTHUR J. GALLAGHER & CO.

Incidentdiscovered Sep 26, 2020

Stated responseTook systems offline as a precautionary measure

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov