MalwareProfessional ServicesProfessional ServicesRansomwareStolen CredentialsRansom DemandedData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountHealth (basic)AuthenticationMediumContained

Clarkson PLC

bd_06e36193466535f1 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 7, 2017

Filed

Jul 30, 2018

To disclose

38 weeks

Affected

3state residents only

Linked

2 filings

Confidence

66%

Full breach record for Clarkson PLC →

Clarkson PLC notified the NH AG of a ransomware incident where an unauthorized third party accessed systems via a single user account from May 31 to Nov 4, 2017, copying data and demanding ransom. Discovered Nov 7, 2017. Data included SSN, DOB, and financial info. 3 NH residents affected. Notices mailed July 30, 2018.

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Incident timeline

undetected · 160 days

discovery → filing · 38 weeks / 265 days

May 31, 2017

Begins

Nov 7, 2017

Discovered

Jul 30, 2018

Filed

vs. sector median

+18 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_ab3acba3baa4ae742018-07-30Verified

Name: Mullen Coughlin LLC
norm: mullen coughlin

Name: Clarkson PLC
norm: clarkson
Industry: Professional Servicesllm

Discovered: Nov 7, 2017
Breach occurred: May 31, 2017 – Nov 4, 2017
Undetected for: 160 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 30, 2018
Affected individuals: 3state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)Authentication
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: notifying regulatorsinforming law enforcementprovided notice of this incident to the Regulatory News Service in the United Kingdomprovide notice of this event to other state, federal, and international regulators as required by law
Initial access: valid_credentials

During the incident: Launched an immediate investigation into the nature and scope of the event
Notifying regulators
Working with third party forensic investigators
Informing law enforcement
Disabled this account
Successfully trace and recover the copy of the data that was illegally copied from its systems
Mailing written notice to those individuals whose data was present on the systems impacted by the event
Posting notice of this event on its website
Issuing a national press release
Offering you access to one (1) year of identity protection services
Changes made: Putting in place additional security measures to best protect against a similar incident happening in the future
Escalating certain planned enhancements as part of its wider cybersecurity review
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 38 weeks(265 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 AGJul 30 · first

New Hampshire State AGJul 30 · 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/clarksons-20180730.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 30, 2018
Raw hash: 4dfa3da03ee635bd40ac11133a57bb7cb2247e50bc24b501e1d837c83f902636

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMullen Coughlin LLC

Victim entityClarkson PLC

Incidentdiscovered Nov 7, 2017

Stated responseLaunched an immediate investigation into the nature and scope of the event

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov