HackingProfessional ServicesProfessional ServicesVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedTargetedAuthenticationCredentialsEmploymentFinancial accountHealth (basic)Identity (basic)Government IDPHIMediumContained

KIRKLAND & ELLIS LLP

bd_e570578a73aa4c7e · schema v1 · pii pii-v1

Severity

Medium

Discovered

May 31, 2023

Filed

Jun 12, 2024

To disclose

13 months

Affected

810state residents only

Linked

10 filings

Confidence

69%

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

Kirkland & Ellis LLP reported a data breach involving its third-party vendor Progress Software's MOVEit Transfer solution. Unauthorized access occurred between May 27-31, 2023, affecting personal information including names, SSNs, financial accounts, and health data. 810 Washington residents were notified. The firm engaged forensic experts, notified law enforcement, and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d13 months 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 · 4 days

discovery → filing · 13 months / 378 days

May 27, 2023

Begins

May 31, 2023

Discovered

Jun 12, 2024

Filed

vs. sector median

+35 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 →

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Sitecl0pbd_2a6a38a4fce50e7f2023-06-29 · +349dVerified by operator
Leak Sitecl0pbd_a8a40d279b2b72b92023-06-29 · +349dVerified by operator

Regulatory filings (7) · sorted by filing gap

California State AGbd_02237a7cc8f297a42024-06-12Verified by operator
Maine State AGbd_5014b08744e1235e2024-06-12Verified
Montana State AGbd_76e20d53b936d6eb2024-06-12Verified by operator
New Hampshire State AGbd_7817adae867820ef2024-06-17 · +5dVerified by operator

Show 3 more filings ↓up to 279d gap

Illinois State AGbd_cfca829068da16642024-06-01 · +11dVerified by operator
Vermont State AGbd_0f2b6129de255d012024-05-28 · +15dVerified by operator
Massachusetts State AGbd_45f3062279233bd32023-09-07 · +279dVerified 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: —
Notification sent: May 28, 2024
Affected individuals: 810state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)CredentialsEmployment
Data elements: NameSocial Security numberDriver's licence numberFinancial account numberDate of birthPassport numberHealth insurance IDMedical informationUsername + password
WA-stated cause: Cyberattack
WA-stated duration: lifecycle 1-99dexposure 1-99d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1041 Exfiltration Over C2 Channel
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
Changes made: Offering credit monitoring and identity restoration services for 24 months at no cost through Experian
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 months(378 days from discovery to filing)
Compliance flags: Leak >180dWA AG >90d
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.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Massachusetts State AGSep 7 · first

Vermont State AG+264d

Illinois State AG+268d

California State AG+279d

Maine State AG+279d

Montana State AG+279d

Washington State AG+279d · this page

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachA29497.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 12, 2024
Raw hash: 08d242045c98bc165b59bed3d119ff428285f5e0a456240bde56f965068130b8

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

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com