HackingFinancial ServicesTechnologyFinanceVulnerability ExploitCapture Stored DataZero-DayData ExfiltratedSupply Chain (3P Vendor)TargetedIdentity (basic)Government IDFinancial accountHighContained

Financial Institution Service Corporation

bd_464efdbae9f239d3 · schema v1 · pii pii-v1

Severity

High

Discovered

May 31, 2023

Filed

Sep 22, 2023

To disclose

16 weeks

Affected

2,140state residents only

Confidence

70%

Full breach record for Financial Institution Service Corporation →10 incidents on file

Supplemental notice for Financial Institution Service Corporation (FISC) regarding a MOVEit Transfer zero-day exploit. Unauthorized access occurred May 30-31, 2023. Data exfiltrated included names, addresses, SSNs, driver's licenses, and financial account info. 2,140 Washington residents affected. FISC engaged forensic specialists, notified law enforcement, and provided 12 months of credit monitoring via Kroll.

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Washington clock✗ WA AG >90d16 weeks discovery → filing

⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 1 days

discovery → filing · 16 weeks / 114 days

May 30, 2023

Begins

May 31, 2023

Discovered

Sep 22, 2023

Filed

vs. sector median

+8 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2,140 affectedView incident

A leak claim by cl0p about this victim predates this filing by 77 days.View originating leak claim

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Financial Institution Service Corporation
norm: financial institution service
Domain: fiscdp.com
Industry: Financial ServicesllmTechnologyllm

Discovered: May 31, 2023
Breach occurred: May 30, 2023 – May 31, 2023
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Sep 22, 2023
Affected individuals: 2,140state-resident count only
Data types: Identity (basic)Government IDFinancial account
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthPassport number
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 ChannelT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: Reported the event to federal law enforcement and its primary federal regulators
Initial access: exploit_public_facing

During the incident: Launched an investigation, with the assistance of third-party cybersecurity specialists
Applied available patching
Undertook recommended mitigation steps
Reported the event to federal law enforcement and its primary federal regulators
Providing access to credit monitoring services for 12 months, through Kroll
Established a toll-free call center for notified individuals
Changes made: Reviewing and enhancing existing policies and procedures related to data privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 16 weeks(114 days from discovery to filing)
Compliance flags: WA AG >90dLeak >30d
Discovery-date grounding: AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA26579.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 22, 2023
Raw hash: c5e8d87fbb9fe92ead4345f1730c542c1fea380d1abec20399dcd6a292dc8cc3

Reporting entityMullen Coughlin LLC

Victim entityFinancial Institution Service Corporation

Incidentdiscovered May 31, 2023

Stated responseLaunched an investigation, with the assistance of third-party cybersecurity specialists

ComplianceWA AG >90d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com