HackingProfessional ServicesProfessional ServicesData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

Williams Accountancy Corporation

bd_8b892c779a04ed23 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 30, 2025

Filed

Mar 4, 2026

To disclose

9 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for Williams Accountancy Corporation →

Williams Accountancy Corporation discovered on December 30, 2025, that an unauthorized third party accessed its network on December 25-26, 2025, acquiring files containing names, dates of birth, Social Security numbers, and bank account numbers. The company engaged forensic investigators, contained the incident, and offered credit monitoring to affected individuals.

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Incident timeline

undetected · 5 days

discovery → filing · 9 weeks / 64 days

Dec 25, 2025

Begins

Dec 30, 2025

Discovered

Mar 4, 2026

Filed

vs. sector median

9 wks faster

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

Name: Williams Accountancy Corporation
norm: williams accountancy

Name: Williams Accountancy Corporation
norm: williams accountancy
Industry: Professional Servicesllm

Discovered: Dec 30, 2025
Breach occurred: Dec 25, 2025 – Dec 26, 2025
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Data elements: Social Security numberDate of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External

During the incident: Took steps to contain and remediate the incident
Began an internal investigation
Engaged a forensic security firm to assist with the investigation
Reviewed technical security measures
Arranged for complimentary Experian IdentityWorks Credit 3B membership
Changes made: Reviewing technical security measures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(64 days from discovery to filing)
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://oag.ca.gov/ecrime/databreach/reports/sb24-619635
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 4, 2026
Raw hash: b668df8dcf1124739aed66af7ff60b80f85b2ff922a9cfbd4efb1c84c4318cee

Reporting entityWilliams Accountancy Corporation

Victim entityWilliams Accountancy Corporation

Incidentdiscovered Dec 30, 2025

Stated responseTook steps to contain and remediate the incident

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov