DisclosureLens
GLOBALMalwareTelecom & MediaInformationRansomwareArvinclubRansom DemandedActor NamedMedium

T-MOBILE USA, INC.

bd_746207c2b82fddcc · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Sep 9, 2021

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

50%
Full breach record for T-MOBILE USA, INC. →22 incidents on file

Threat-actor claim — not a regulatory filing

This row is a claim by the ransomware group Arvinclub on its public extortion blog. It has not been validated by the victim or any regulator. Treat attribution and counts as the threat actor's assertion until a regulatory filing or victim disclosure corroborates them.

Group activity: TelecommunicationDiscovered: 2021-09-09
View aggregator listing on ransomware.liveView merged incident timeline

Source: Ransomware.live

Incident timeline — mostly unverified

? — ?

Breach window unknown

Sep 9, 2021

Claim posted

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

Claim → filing

—

Compliance clock

Not assessable

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

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Filing propagation · 2 filings

View merged incident ↗
Illinois State AGJan 1 · first
Leak Site+251d · this page

Pattern: first filing Jan 1 (IL), last Sep 9 — a 251-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claimThis record

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 statement

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

Source ceiling

  • actor name
  • victim claim
  • ransom/leak status
  • discovery date
  • materiality
  • notification
  • affected count
  • confirmed data types
  • compliance clock

The ✕ fields stay blank until a regulatory filing or victim disclosure lands.

About this groupFirst seen 2021-09-09

arvinclub

According to ransomware.live, Arvin Club is a threat actor with hacktivist leanings that first appeared in May 2021, primarily publishing stolen data via a TOR site and Telegram rather than deploying file-encrypting ransomware, targeting government, education, and banking sectors globally including Iranian government entities.

35 victims claimed globally35 tracked hereFull profile →