MalwareFinancial ServicesProfessional ServicesFinanceRansomwareData ExfiltratedData EncryptedRansom DemandedPIIIdentity (basic)Government IDMediumContained

Arch Insurance Company

bd_46c22c0e135074c1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Aug 17, 2021

To disclose

—

Affected

950state residents only

Confidence

64%

Full breach record for Arch Insurance Company →

Arthur J. Gallagher & Co. reported a ransomware incident detected on September 26, 2020, affecting systems accessed between June 3 and September 26, 2020. The breach impacted PII including government IDs. Gallagher engaged forensic specialists, took systems offline, and provided 24 months of credit monitoring. No specific victim count was disclosed in this notice.

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Incident timeline

Jun 3, 2020

Begins

Aug 17, 2021

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed950 affectedView incident

Name: ARTHUR J. GALLAGHER & CO.
norm: arthur j gallagher

Name: Arch Insurance Company
norm: arch insurance
Industry: Financial ServicesllmProfessional Servicesllm

Discovered: —
Breach occurred: Jun 3, 2020 – Sep 26, 2020
Materiality determined: —
Notification sent: —
Affected individuals: 950state-resident count only
Data types: PIIIdentity (basic)Government ID
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 to minimize disruption to our customers
Ensured the ongoing security of our systems
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
Providing additional training to our employees on data privacy and security
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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://consumer.sc.gov/sites/consumer/files/Documents/Business%20Resources%20Laws/Related%20Laws/Breaches/2021/ArchInsuranceCo.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: 5218b2be6cb72fe0d0d0148c2bee453fad425a502967a69e14fd3aa3f87d477c

Reporting entityARTHUR J. GALLAGHER & CO.

Victim entityArch Insurance Company

IncidentRansomware

Stated responseTook all our systems offline as a precautionary measure

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov