HackingProfessional ServicesProfessional ServicesDelayed DiscoveryPIIIdentity (basic)LowContained

Donlen Corporation, now known as Sellerco Corporation

bd_14705bebc5765656 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 4, 2021

Filed

Aug 29, 2022

To disclose

18 months

Affected

10state residents only

Confidence

65%

Donlen Corporation (now Sellerco Corporation) notified individuals of a data breach where an unknown actor accessed the network between Feb 24 and Mar 4, 2021. The breach may have exposed names and other personal data. The company reset passwords, engaged forensic review, and offered credit monitoring. Notification was sent in August 2022.

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Incident timeline

undetected · 8 days

discovery → filing · 18 months / 543 days

Feb 24, 2021

Begins

Mar 4, 2021

Discovered

Aug 29, 2022

Filed

vs. sector median

+60 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed10 affectedView incident

Name: Donlen Corporation, now known as Sellerco Corporation
norm: donlen sellerco

Name: Donlen Corporation, now known as Sellerco Corporation
norm: donlen sellerco
Industry: Professional Servicesllm

Discovered: Mar 4, 2021
Breach occurred: Feb 24, 2021 – Mar 4, 2021
Undetected for: 8 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 29, 2022
Affected individuals: 10state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: notifying relevant state regulators

During the incident: Resetting relevant account passwords
Reviewing the contents of the impacted systems to determine whether they contained personal information
Reviewing internal systems to identify contact information for purposes of providing notice to potentially affected individuals
Notifying relevant state regulators
Offering you access to complimentary credit monitoring and identity protection services for 12/24 months through IDX
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 18 months(543 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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://dojmt.gov/wp-content/uploads/OCP/Consumer-Notification-Letter-524.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 29, 2022
Raw hash: 7a55d9c4e9655140ecf4d57e3d8aeb316d8793ee40e04860d4313702a75bba4e

Reporting entityDonlen Corporation, now known as Sellerco Corporation

Victim entityDonlen Corporation, now known as Sellerco Corporation

Incidentdiscovered Mar 4, 2021

Stated responseResetting relevant account passwords

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov