HackingProfessional ServicesProfessional ServicesVulnerability ExploitCLOPData ExfiltratedTargetedIdentity (basic)LowContained

Proskauer Rose LLP

bd_159d138f779ae6b8 · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 27, 2023

Filed

Nov 20, 2023

To disclose

21 weeks

Affected

1state residents only

Linked

2 filings

Confidence

67%

Full breach record for Proskauer Rose LLP →2 incidents on file

Proskauer Rose LLP notified the NH AG of a breach involving its MOVEit Transfer instance. The CLOP threat group exploited a vulnerability in late May 2023 to exfiltrate data. Proskauer discovered the incident on June 27, 2023, after being named on a leak site. One NH resident's PII was affected. Proskauer shut down the instance, engaged forensic experts, and offered credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 27 days

discovery → filing · 21 weeks / 146 days

May 31, 2023

Begins

Jun 27, 2023

Discovered

Nov 20, 2023

Filed

vs. sector median

+3 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_935198f92c3d56642023-11-20Verified

Name: Proskauer Rose LLP
norm: proskauer rose

Name: Proskauer Rose LLP
norm: proskauer rose
Industry: Professional Servicesllm

Discovered: Jun 27, 2023
Breach occurred: May 31, 2023
Undetected for: 27 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 17, 2023
Affected individuals: 1state-resident count only
Data types: Identity (basic)
Attack vector: Third-Party / Supply Chain· CLOP
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1041 Exfiltration Over C2 Channel
Threat actor: CLOPExternalFinancial
Regulator citations: reported the unauthorized and unlawful access to law enforcement
Initial access: exploit_public_facing

During the incident: Initiated a privileged investigation, directed by outside counsel, with the assistance of leading outside cybersecurity experts
Reported the unauthorized and unlawful access to law enforcement
Discontinued its use of MOVEit
Completed manual review of the affected files
Offering individuals whose personal information may have been exposed of complimentary identity theft and credit monitoring services through Experian
Established a call center to respond to individuals’ questions
Changes made: Terminated our MOVEit instance
Engaged leading cybersecurity and forensic experts to conduct a full investigation and review all compromised data
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 21 weeks(146 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGNov 20 · first

New Hampshire State AGNov 20 · 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://mm.nh.gov/files/uploads/doj/remote-docs/proskauer-rose-20231120.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 20, 2023
Raw hash: b704e3c0d783a11469b72e8c30b7cf2896bdd0802f40d74958b996b44e507d68

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityProskauer Rose LLP

Victim entityProskauer Rose LLP

Incidentdiscovered Jun 27, 2023

Stated responseInitiated a privileged investigation, directed by outside counsel, with the assistance of leading outside cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov