HackingFinancial ServicesProfessional ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

GC Services

bd_af38af1c89b59797 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 26, 2023

Filed

Jan 25, 2024

To disclose

4 weeks

Affected

10state residents only

Linked

11 filings

Confidence

65%

Full breach record for GC Services →

GC Services notified Montana residents of a data security incident discovered on December 26, 2023. Unauthorized access occurred between September 11 and 20, 2023, potentially exposing names, addresses, SSNs, and dates of birth. GC Services engaged external experts, notified the FBI, and offered credit monitoring services.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 106 days

discovery → filing · 4 weeks / 30 days

Sep 11, 2023

Begins

Dec 26, 2023

Discovered

Jan 25, 2024

Filed

vs. sector median

4 wks faster

This filing is one of 11 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Maine State AGbd_3f8368515ad2e05c2024-01-25Candidate
New Hampshire State AGbd_8725b4ef8674e1b32024-01-25Verified
Indiana State AGbd_c4f44f2ed5304f062024-01-25Verified
Massachusetts State AGbd_c80b37a48adddb662024-01-25Verified

Show 6 more filings ↓up to 28d gap

New Hampshire State AGbd_459779589b5e856c2024-01-30 · +5dVerified
Vermont State AGbd_4eed0dc1feab88d62024-01-30 · +5dVerified
Maine State AGbd_fc32c57d587034792024-01-30 · +5dVerified
Massachusetts State AGbd_bdb8adf089457bf62024-01-31 · +6dVerified
Maine State AGbd_cff61c307f5362562024-02-21 · +27dVerified
Massachusetts State AGbd_0397e70bb14181412024-02-22 · +28dVerified

Name: GC Services
norm: gc services

Name: GC Services
norm: gc services
Industry: Financial ServicesllmProfessional Servicesllm

Discovered: Dec 26, 2023
Breach occurred: Sep 11, 2023 – Sep 20, 2023
Undetected for: 106 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 25, 2024
Affected individuals: 10state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: notified the Federal Bureau of Investigation
Initial access: valid_credentials

During the incident: Launched an investigation with the support of external cybersecurity experts
Took steps to secure our network
Notified the Federal Bureau of Investigation
Changes made: Offering you access to credit monitoring and identity theft protection services through IDX, A ZeroFox Company
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 4 weeks(30 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 6 states

View merged incident ↗

Maine State AGJan 25 · first

New Hampshire State AGJan 25 · first

Indiana State AGJan 25 · first

Massachusetts State AGJan 25 · first

Montana State AGJan 25 · first · this page

New Hampshire State AG+5d

Vermont State AG+5d

Maine State AG+5d

Massachusetts State AG+6d

Maine State AG+27d

Massachusetts State AG+28d

Pattern: first filing Jan 25 (ME), last Feb 22 (MA) — a 28-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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-1055.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 25, 2024
Raw hash: 3ebcbb779c152db428c74efbb2f90f8de5196729fd0404e6399b4b530a0b18b3

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityGC Services

Victim entityGC Services

Incidentdiscovered Dec 26, 2023

Stated responseLaunched an investigation with the support of external cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov