Social EngineeringFinancial ServicesFinancePhishingTargetedPIIIdentity (basic)LowContained

ELLINGTON MANAGEMENT GROUP, L.L.C.

bd_f7a5bb29d8e2588f · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 8, 2023

Filed

Nov 10, 2023

To disclose

13 weeks

Affected

5state residents only

Linked

3 filings

Confidence

66%

Full breach record for ELLINGTON MANAGEMENT GROUP, L.L.C. →2 incidents on file

Ellington Management Group, L.L.C. notified individuals of a data incident where an unauthorized actor accessed a single email account between July 18 and August 8, 2023, to send phishing emails. No data exfiltration was found, but personal information (names, etc.) was present in the account. Ellington changed passwords, notified law enforcement, engaged forensic assistance, and offered 12 months of Kroll identity monitoring.

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Incident timeline

undetected · 21 days

discovery → filing · 13 weeks / 94 days

Jul 18, 2023

Begins

Aug 8, 2023

Discovered

Nov 10, 2023

Filed

vs. sector median

+5 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_177e02641a7af4832023-11-10Verified
Vermont State AGbd_30c661b64bc6498c2023-11-10Verified

Name: ELLINGTON MANAGEMENT GROUP, L.L.C.
norm: ellington management

Name: ELLINGTON MANAGEMENT GROUP, L.L.C.
norm: ellington management
Industry: Financial Servicesllm

Discovered: Aug 8, 2023
Breach occurred: Jul 18, 2023 – Aug 8, 2023
Undetected for: 21 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 5state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: External
Regulator citations: notifying federal law enforcement
Initial access: phishing_link

During the incident: Changed passwords
Notifying federal law enforcement
Engaging leading cybersecurity professionals for assistance
Working with a leading data security and privacy firm to aid our investigation
Implemented additional security protocols designed to protect our network, email environment, and systems
Assessing the entirety of our information security program
Secured the services of Kroll to provide identity monitoring at no cost to you for twelve (12) months
Changes made: Implemented additional security protocols designed to protect our network, email environment, and systems
Assessing the entirety of our information security program
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(94 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGNov 10 · first

Vermont State AGNov 10 · first

Montana State AGNov 10 · first · this page

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://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-835.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 10, 2023
Raw hash: 888facdea24578b911b1e35d3a9d3f425617263b28f7d855b16f5101756a9e65

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityELLINGTON MANAGEMENT GROUP, L.L.C.

Victim entityELLINGTON MANAGEMENT GROUP, L.L.C.

Incidentdiscovered Aug 8, 2023

Stated responseChanged passwords

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov