FEDERALMalwareTechnologyInformationRansomwareData EncryptedPIIIP / systemLowContained

Tecogen Inc.

bd_b9bff3450f42f343 · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 28, 2023

Filed

Mar 19, 2026

To disclose

35 months

Affected

Not disclosed

Confidence

65%

Full breach record for Tecogen Inc. →2 incidents on file

TECOGEN Inc. disclosed a ransomware attack on its computer network occurring on April 28, 2023, in its 10-K Item 1C. The company states the network returned to full operation on May 1, 2023, following remediation. The filing highlights reliance on third-party consultants for risk management and incident response but does not specify the scope of data exfiltration or the identity of the threat actor.

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Incident timeline

discovery → filing · 35 months / 1056 days

Apr 28, 2023

Begins

Apr 28, 2023

Discovered

Mar 19, 2026

Filed

vs. sector median

+140 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.No incident reportedView incident

Name: Tecogen Inc.
norm: tecogen

Name: Tecogen Inc.
norm: tecogen
Industry: Technologyllm

Discovered: Apr 28, 2023
Breach occurred: Apr 28, 2023 – May 1, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PIIIP / system
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial

During the incident: Engaged a third-party consultant in connection with our risk management and assessment processes
Engaged a third-party consultant to manage risks associated with network protection and workstation management
Changes made: Implemented cybersecurity risk management program
Integrated cybersecurity risk management program into broader enterprise risk management program
Engaged third-party consultant for annual assessment of cybersecurity risk policies and procedures
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 35 months(1056 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 filing

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statementThis record

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://www.sec.gov/Archives/edgar/data/1537435/000153743526000013/tgen-20251231.htm
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Mar 19, 2026
Raw hash: 682acbbd80e5834f2607a55e370d8420d01e2669a939bad2ee603034f4aaea62

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Reporting entityTecogen Inc.

Victim entityTecogen Inc.

Incidentdiscovered Apr 28, 2023

Stated responseEngaged a third-party consultant in connection with our risk management and assessment processes

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.sec.gov

Source filing