MalwareEducationEducationRansomwareData MishandlingSupply Chain (3P Vendor)Data ExfiltratedData EncryptedCustomer Data InvolvedHealth (basic)Identity (basic)PHIPIIMediumContained

THE OPEN WINDOW SCHOOL

bd_aa1993582a763f98 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 6, 2020

Filed

Aug 31, 2020

To disclose

25 days

Affected

1,929state residents only

Confidence

70%

Full breach record for THE OPEN WINDOW SCHOOL →

The Open Window School notified Washington AG of a third-party ransomware incident involving vendor Blackbaud. Unauthorized access occurred between Feb 7 and May 20, 2020. OWS discovered the incident on Aug 6, 2020. 1,929 Washington residents affected; data included names, DOBs, and medical info. Notices sent Aug 31, 2020.

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Washington clock✓ WA AG ≤30d25 days 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 · 181 days

discovery → filing · 25 days

Feb 7, 2020

Begins

Aug 6, 2020

Discovered

Aug 31, 2020

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,929 affectedView incident

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: THE OPEN WINDOW SCHOOL
norm: the open window school
Industry: Educationllm

Discovered: Aug 6, 2020
Breach occurred: Feb 7, 2020 – May 20, 2020
Undetected for: 181 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 31, 2020
Affected individuals: 1,929state-resident count only
Data types: Health (basic)Identity (basic)PHIPII
Data elements: NameDate of birthMedical information
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 100-199dexposure 100-199d
WA-stated discovery: Found after the fact
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 ChannelT1195 Supply Chain Compromise
Threat actor: ExternalFinancial
Regulator citations: Notified Office of the Attorney General (Washington)
Third party: via Blackbaud, Inc.
Initial access: supply_chain

During the incident: Commenced an investigation to better understand the nature and scope of the incident
Coordinated with Blackbaud to ascertain the scope of the breach
Provided written notice to affected individuals
Provided impacted individuals with guidance on how to better protect against identity theft and fraud
Changes made: Reviewing existing policies and procedures regarding third-party vendors
Working with Blackbaud to evaluate additional measures and safeguards to protect against this type of incident in the future
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 days(25 days from discovery to filing)
Compliance flags: WA AG ≤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/BreachM10273.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 31, 2020
Raw hash: 6c5d9107b8e4993c702556f1b89f2c12df1afcffe90441e865a2ffa97a6d1ff2

Reporting entityMullen Coughlin LLC

Victim entityTHE OPEN WINDOW SCHOOL

Incidentdiscovered Aug 6, 2020

Stated responseCommenced an investigation to better understand the nature and scope of the incident

ComplianceWA AG ≤30d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com