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Legal Exfil Remediated

Bryan Cave Leighton Paisner LLP
Breach Analysis

AmLaw 100 firm Bryan Cave Leighton Paisner — with significant Texas operations — suffered a data breach affecting 585,000 individuals whose data was held on behalf of client organizations. Sensitive PII including Social Security numbers was exfiltrated.

Incident Date
2023-03-10
Records Exposed
585,000
Attack Type
Exfil
Threat Actor
Unconfirmed

How they got in

Exfiltration via compromised file-sharing and collaboration platform credentials. Threat actor moved quietly through document management systems over weeks before detection. Extensive client PII was accessible without data-at-rest encryption on sensitive file stores.

Sentinel / Fortress / Command coverage

Sentinel DLP (data loss prevention) rules on large outbound transfer volume from document systems would alert within hours of exfil attempt
Sentinel User behavior analytics: attorney credential accessing unusual volume of client files at abnormal hours — UEBA alert
Fortress Credential monitoring: compromised credential detected in breach datasets; proactive password reset before threat actor used it
Command ABA Rule 1.6(c) and Texas DR 1.05 compliance mapping identifies sensitive client data classification and encryption gap — remediated in prior vCISO cycle

Sentinel ($89/ep/mo) — 24/7 SOC + SIEM. Fortress ($109/ep/mo) — Sentinel + EDR management + vulnerability management. Command ($129/ep/mo) — Fortress + vCISO + compliance mapping + IR plan. See full tier comparison →

Regulatory exposure

Regime Standard / Citation Gap Identified
ABA ABA Rule 1.6(c) Reasonable measures to prevent unauthorized disclosure of client information
ABA ABA Formal Opinion 477R Security for communication and storage of client confidential information
TDPA Tex. B&C Code §521.053 Texas resident PII breach notification obligations triggered

5-point hardening list

CoreRecon cites verifiable public sources only. No speculation on unverified attribution is published. Threat actor attribution appears only where publicly confirmed by law enforcement or the organization.

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