HackingFinancial ServicesFinanceData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountMediumContained

NATIONSTAR MORTGAGE LLC

bd_57eb457f3eb2112d · schema v1 · pii pii-v1

Severity

Medium

Discovered

Oct 31, 2023

Filed

Dec 15, 2023

To disclose

6 weeks

Affected

Not disclosed

Linked

11 filings

Confidence

64%

Full breach record for NATIONSTAR MORTGAGE LLC →11 incidents on file

Nationstar Mortgage LLC (dba Mr. Cooper) detected suspicious activity on October 31, 2023, leading to the discovery of unauthorized access to certain systems between October 30 and November 1, 2023. An unauthorized party obtained files containing personal information including names, addresses, phone numbers, Social Security numbers, dates of birth, and bank account numbers. The company shut down systems to contain the incident, engaged cybersecurity experts, and contacted law enforcement. Approximately 47,818 Rhode Island residents were affected. The company is offering 24 months of credit monitoring and fraud assistance.

J jump to incidentP pin to compareR raw source

California clockDiscovered Oct 31, 2023 → Notified Dec 1, 202331d ✓ CA 60-day OK6 weeks discovery → filing

Incident timeline

undetected · 1 days

discovery → filing · 6 weeks / 45 days

Oct 30, 2023

Begins

Oct 31, 2023

Discovered

Dec 15, 2023

Filed

vs. sector median

2 wks faster

This filing is one of 11 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Delaware State AGbd_1649a1b2c61961c42023-12-15Verified
Montana State AGbd_5d5578f4cbaaad522023-12-15Verified
Maine State AGbd_94029d67f539973d2023-12-15Verified
Oregon State AGbd_bcd8a251801840a22023-12-15Verified

Show 6 more filings ↓up to 348d gap

Massachusetts State AGbd_d73092edf21768402023-12-15Verified
Washington State AGbd_ec18ec8370ea53762023-12-15Verified
South Carolina State AGbd_c8e492a4998540cc2023-12-18 · +3dVerified
New Hampshire State AGbd_66a3873bc3c9facf2023-12-19 · +4dVerified
California State AGbd_0b70ea800f8666122024-03-22 · +98dVerified
Illinois State AGbd_d9053568a4f8d29b2023-01-01 · +348dCandidate

Name: NATIONSTAR MORTGAGE LLC
norm: nationstar mortgage

Name: NATIONSTAR MORTGAGE LLC
norm: nationstar mortgage
Also named: Nationstar Mortgage LLCdba oflegal entity
Mr. Cooperdba oftrade name
Industry: Financial Servicesllm

Discovered: Oct 31, 2023
Breach occurred: Oct 30, 2023 – Nov 1, 2023
Undetected for: 1 dayoccurrence → discovery
Materiality determined: —
Notification sent: Dec 1, 2023
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial account
Data elements: Date of birth
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External

During the incident: Detected suspicious activity in certain network systems
Initiated response protocols
Launched an investigation with the assistance of cybersecurity experts
Contacted law enforcement
Shut down our systems to contain the incident
Locked down our systems
Changed account passwords
Restored our systems
Initiated a detailed review to identify personal information contained in the impacted files
Monitoring the dark web
Changes made: Further enhancing the security of our systems to help prevent incidents like this from happening in the future
Providing access to Single Bureau Credit Monitoring/Single Bureau Credit Report/Single Bureau Credit Score services at no charge for 24 months
Providing proactive fraud assistance
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(45 days from discovery to filing)
Compliance flags: CA 60-day OK · 31d
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: Oct 31, 2023
→ Notified: Dec 1, 2023
31d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Oct 31, 2023 → Notified: Dec 1, 2023	31d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Illinois State AGJan 1 · first

Delaware State AG+348d

Montana State AG+348d

Maine State AG+348d

Oregon State AG+348d

Massachusetts State AG+348d

Washington State AG+348d

California State AG+348d · this page

South Carolina State AG+351d

New Hampshire State AG+352d

California State AG+446d

Pattern: first filing Jan 1 (IL), last Mar 22 (CA) — a 446-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/sb24-578028
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 15, 2023
Raw hash: 2a7c66220d3c11aa387fbb8c7af19ed5a04a7b0dc92cd404d528cc2b29319488

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityNATIONSTAR MORTGAGE LLC

Victim entityNATIONSTAR MORTGAGE LLC

Incidentdiscovered Oct 31, 2023

Stated responseDetected suspicious activity in certain network systems

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov