HackingProfessional ServicesProfessional ServicesVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedIdentity (basic)Government IDFinancial accountHealth (basic)CredentialsEmploymentMediumContained

KIRKLAND & ELLIS LLP

bd_0f2b6129de255d01 · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 31, 2023

Filed

May 28, 2024

To disclose

52 weeks

Affected

Not disclosed

Linked

10 filings

Confidence

67%

Full breach record for KIRKLAND & ELLIS LLP →2 incidents on file

Kirkland & Ellis LLP notified consumers of a data breach stemming from a vulnerability in Progress Software's MOVEit Transfer solution. The incident occurred between May 27-31, 2023, affecting files containing PII, government IDs, financial data, health info, and credentials. The firm engaged forensic experts, notified law enforcement, and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Vermont clock✗ VT AG >45 bday52 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 4 days

discovery → filing · 52 weeks / 363 days

May 27, 2023

Begins

May 31, 2023

Discovered

May 28, 2024

Filed

vs. sector median

+33 wks slower

This filing is one of 10 about the same incident.View merged incident

Part of Progress Software Corporation supply-chain incident (2023) — a supply-chain cascade affecting multiple organizations.View cascade →

A leak claim by cl0p about this victim predates this filing by 334 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Sitecl0pbd_2a6a38a4fce50e7f2023-06-29 · +334dVerified by operator
Leak Sitecl0pbd_a8a40d279b2b72b92023-06-29 · +334dVerified by operator

Regulatory filings (7) · sorted by filing gap

Illinois State AGbd_cfca829068da16642024-06-01 · +4dVerified by operator
California State AGbd_02237a7cc8f297a42024-06-12 · +15dVerified by operator
Maine State AGbd_5014b08744e1235e2024-06-12 · +15dVerified
Montana State AGbd_76e20d53b936d6eb2024-06-12 · +15dVerified by operator

Show 3 more filings ↓up to 264d gap

Washington State AGbd_e570578a73aa4c7e2024-06-12 · +15dVerified
New Hampshire State AGbd_7817adae867820ef2024-06-17 · +20dVerified by operator
Massachusetts State AGbd_45f3062279233bd32023-09-07 · +264dVerified by operator

Name: KIRKLAND & ELLIS LLP
norm: kirkland ellis
Domain: kirkland.com

Name: KIRKLAND & ELLIS LLP
norm: kirkland ellis
Domain: kirkland.com
Industry: Professional Servicesllm

Discovered: May 31, 2023
Breach occurred: May 27, 2023 – May 31, 2023
Undetected for: 4 daysoccurrence → discovery
Materiality determined: May 28, 2024
Notification sent: May 28, 2024
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDFinancial accountHealth (basic)CredentialsEmployment
Data elements: Date of birth
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Reported the issue to law enforcement
Third party: via Progress Software
Initial access: supply_chain

During the incident: Initiated an investigation
Took steps to secure relevant systems
Working with leading cybersecurity experts
Reported the issue to law enforcement
Put in place additional monitoring measures
Offered 24 months of complimentary credit monitoring and identity restoration services through Experian
Changes made: Implemented additional monitoring measures to further protect systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 52 weeks(363 days from discovery to filing)
Compliance flags: VT AG >45 bdayLeak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Massachusetts State AGSep 7 · first

Vermont State AG+264d · this page

Illinois State AG+268d

California State AG+279d

Maine State AG+279d

Montana State AG+279d

Washington State AG+279d

New Hampshire State AG+284d

Pattern: first filing Sep 7 (MA), last Jun 17 (NH) — a 284-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://ago.vermont.gov/document/2024-05-28-kirkland-ellis-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 28, 2024
Raw hash: 151d3162da0822a5dbafadcc05f2bd5e6934847932c40b8224bff6ec25304ccd

Linked disclosures

Ransomware claims (2)

Regulatory filings (7) · sorted by filing gap

Reporting entityKIRKLAND & ELLIS LLP

Victim entityKIRKLAND & ELLIS LLP

Incidentdiscovered May 31, 2023

Stated responseInitiated an investigation

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov