HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDHealth (basic)MediumContained

Aon

bd_a3a4b3bd3ddac8fc · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 25, 2022

Filed

May 26, 2022

To disclose

13 weeks

Affected

Not disclosed

Linked

14 filings

Confidence

64%

Full breach record for Aon →11 incidents on file

Aon PLC disclosed a cyber incident where an unauthorized third party accessed systems between Dec 29, 2020, and Feb 26, 2022. The incident was discovered on Feb 25, 2022. Personal information including names, SSNs, driver's license numbers, and some benefit enrollment data was temporarily obtained. Aon engaged cybersecurity firms, notified the FBI, and offered 24 months of identity monitoring.

J jump to incidentP pin to compareR raw source

California clockDiscovered Feb 25, 2022 → Notified May 27, 202291d ✗ CA 60-day late13 weeks discovery → filing

Incident timeline

undetected · 423 days

discovery → filing · 13 weeks / 90 days

Dec 29, 2020

Begins

Feb 25, 2022

Discovered

May 26, 2022

Filed

vs. sector median

5 wks faster

This filing is one of 14 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitedispossessorbd_d4e9fb69d737f7a62022-07-03 · +38dVerified by operator

Regulatory filings (9) · sorted by filing gap

HHS OCRbd_1659c519cbbc91942022-05-26Verified by operator
Oregon State AGbd_a34b45e6fa897e082022-05-26Verified
Maine State AGbd_bdef13158191852d2022-05-26Candidate
Indiana State AGbd_fde32f8598ecaa8b2022-05-27 · +1dVerified

Show 5 more filings ↓up to 36d gap

New Hampshire State AGbd_bed97e68b6fb0b6c2022-05-31 · +5dVerified by operator
New Hampshire State AGbd_5ba6400246ccb57f2022-06-13 · +18dVerified by operator
Montana State AGbd_f3bea3092e6d8ecc2022-06-13 · +18dVerified by operator
Maine State AGbd_ee7cfc9886fcd7132022-06-24 · +29dCandidate
Maine State AGbd_83344b1fed7fdb7a2022-07-01 · +36dCandidate

Showing first 10 of 13 linked disclosures.

Name: Aon
norm: aon
Domain: aon.com

Name: Aon
norm: aon
Domain: aon.com
Industry: Professional Servicesllm

Discovered: Feb 25, 2022
Breach occurred: Dec 29, 2020 – Feb 26, 2022
Undetected for: 423 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 27, 2022
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Regulator citations: Reported the incident to, and is working closely with, law enforcement authorities, including the FBI

During the incident: Retained leading cybersecurity firms to assist in responding and help conduct a thorough investigation of the incident
Reported the incident to, and is working closely with, law enforcement authorities, including the FBI
Offering complimentary access to Experian IdentityWorks for 24 months
Changes made: Implemented numerous measures designed to enhance the security of our network, systems, and data
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(90 days from discovery to filing)
Compliance flags: CA 60-day late · 91d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Feb 25, 2022
→ Notified: May 27, 2022
91d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Feb 25, 2022 → Notified: May 27, 2022	91d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 10 filings · 7 states

View merged incident ↗

HHS OCRMay 26 · first

Oregon State AGMay 26 · first

Maine State AGMay 26 · first

California State AGMay 26 · first · this page

Indiana State AG+1d

New Hampshire State AG+5d

New Hampshire State AG+18d

Montana State AG+18d

Maine State AG+29d

Maine State AG+36d

Pattern: first filing May 26 (IL), last Jul 1 (ME) — a 36-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 13 — 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://oag.ca.gov/ecrime/databreach/reports/sb24-553817
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 26, 2022
Raw hash: 9702d98125fca9a8396d8489d5e07852ef92431670f4f0022eca84839f97d613

Linked disclosures

Ransomware claims (1)

Regulatory filings (9) · sorted by filing gap

Reporting entityAon

Victim entityAon

Incidentdiscovered Feb 25, 2022

Stated responseRetained leading cybersecurity firms to assist in responding and help conduct a thorough investigation of the incident

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov