Social EngineeringFinancial ServicesTechnologyFinancePhishingStolen CredentialsTargetedCustomer Data InvolvedGovernment IDPIIHighContained

TransUnion

bd_fd85f6604075cd91 · schema v1 · pii pii-v1

Severity

High

Discovered

Jul 30, 2025

Filed

Sep 2, 2025

To disclose

5 weeks

Affected

25,943state residents only

Linked

15 records

Confidence

66%

Full breach record for TransUnion →11 incidents on file

TransUnion LLC reported a cyber incident in Iowa where a threat actor used social engineering to pose as a help desk technician, tricking call center agents into downloading a malicious application. This allowed the actor to access a third-party application serving U.S. consumer support operations on July 28-29, 2025. The incident resulted in the exfiltration of consumer Social Security Numbers affecting approximately 25,943 Iowa residents. TransUnion contained the breach, notified the FBI, and provided 24 months of credit monitoring to affected individuals.

J jump to incidentP pin to compareR raw source

Iowa clock✓ IA AG ≤5 bday5 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 2 days

discovery → filing · 5 weeks / 34 days

Jul 28, 2025

Begins

Jul 30, 2025

Discovered

Sep 2, 2025

Filed

vs. sector median

3 wks faster

This filing is one of 15 records about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Oregon State AGbd_5b59f10c6f6c553f2025-09-02Verified
Montana State AGbd_9bac2141a674997f2025-09-03 · +1dVerified by operator
Vermont State AGbd_82d4818cdee39c862025-09-01 · +1dVerified by operator
New Hampshire State AGbd_331561e568edbb3f2025-09-04 · +2dVerified by operator

Show 6 more filings ↓up to 6d gap

Texas State AGbd_83b605646965217d2025-09-04 · +2dVerified by operator
South Carolina State AGbd_d7d141dc595dd1b02025-09-04 · +2dVerified by operator
Massachusetts State AGbd_d87eb450bda408862025-09-04 · +2dVerified by operator
Nebraska State AGbd_aaa181287c2471442025-09-08 · +6dVerified by operator
California State AGbd_217b0e65bf1e48972025-08-27 · +6dVerified by operator
Maine State AGbd_9d7ad1a3ef9bd9ae2025-08-27 · +6dVerified by operator

Showing first 10 of 14 linked disclosures.

Name: TransUnion
norm: transunion
Domain: transunion.com

Name: TransUnion
norm: transunion
Domain: transunion.com
Industry: Financial ServicesllmTechnologyllm

Discovered: Jul 30, 2025
Breach occurred: Jul 28, 2025 – Jul 29, 2025
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 26, 2025
Affected individuals: 25,943state-resident count only
Data types: Government IDPII
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified Iowa Attorney General
Initial access: phishing_link

During the incident: Shut down the two call center agents’ system access
Blocked all known URLs for the malicious connected application
Informed the FBI
Changes made: Offering complimentary credit monitoring services for 24 months
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(34 days from discovery to filing)
Compliance flags: IA AG ≤5 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 11 states

View merged incident ↗

California State AGAug 27 · first

Maine State AGAug 27 · first

Vermont State AG+5d

Oregon State AG+6d

Iowa State AG+6d · this page

Montana State AG+7d

New Hampshire State AG+8d

Texas State AG+8d

South Carolina State AG+8d

Massachusetts State AG+8d

Nebraska State AG+12d

Pattern: first filing Aug 27 (CA), last Sep 8 (NE) — a 12-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 14 — the full spread may be wider.

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://www.iowaattorneygeneral.gov/media/cms/922025_TranUnion_LLC_05DE2075E6640.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 2, 2025
Raw hash: cc27609a8a393cdd1187dc400293f7db8367272aaa86a7a82d9f349f923072aa

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityTransUnion

Victim entityTransUnion

Incidentdiscovered Jul 30, 2025

Stated responseShut down the two call center agents’ system access

ComplianceIA AG ≤5 bday

Extraction provenanceno artifact recorded

Source provenancewww.iowaattorneygeneral.gov