HackingManufacturingManufacturingVulnerability ExploitData ExfiltratedCustomer Data InvolvedIdentity (basic)Financial accountMediumContained

ULTRA CLEAN HOLDINGS, INC.

bd_9f16c0167e7bd358 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 5, 2020

Filed

Oct 23, 2020

To disclose

11 weeks

Affected · nationwide

5,44936 in this filing

Linked

7 filings

Confidence

66%

Full breach record for ULTRA CLEAN HOLDINGS, INC. →2 incidents on file

Ultra Clean Holdings, Inc. reported an external system breach (hacking) occurring on August 3, 2020, discovered on August 5, 2020. The incident affected 5,449 individuals, including 36 Maine residents. Stolen data included names and financial account or credit/debit card numbers (with security codes/PINs). The company provided written notification on October 23, 2020, and offered a complimentary two-year subscription to Experian’s IdentityWorks.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Aug 5, 2020 → Filed with AG Oct 23, 202079d ⏱ ME AG >30d11 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 · 11 weeks / 79 days

Aug 3, 2020

Begins

Aug 5, 2020

Discovered

Oct 23, 2020

Filed

vs. sector median

+1 wks slower

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

Montana State AGbd_e8e9dcedfef9c1c52020-10-23Verified
Indiana State AGbd_03edadda5870d6cf2020-11-09 · +17dVerified
Oregon State AGbd_10838ceb3c5347372020-11-10 · +18dVerified
Maine State AGbd_5db3f2dc02d3ea4d2020-12-17 · +55dVerified

Show 2 more filings ↓up to 61d gap

New Hampshire State AGbd_e5a5b45aee7556d32020-12-21 · +59dVerified
California State AGbd_c786788ea36385512020-12-23 · +61dVerified

Name: ULTRA CLEAN HOLDINGS, INC.
norm: ultra clean

Name: ULTRA CLEAN HOLDINGS, INC.
norm: ultra clean
Industry: Manufacturingllm

Discovered: Aug 5, 2020
Breach occurred: Aug 3, 2020
Undetected for: 2 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 23, 2020
Affected individuals: 5,449state + nationwide
Data types: Identity (basic)Financial account
Data elements: Financial account number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: Filed data breach notice with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Sent written notification to affected individuals
Offered complimentary two-year subscription to Experian’s IdentityWorks
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(79 days from discovery to filing)
Compliance flags: ME AG >30d · 79d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Aug 5, 2020
→ Filed with AG: Oct 23, 2020
79d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 5, 2020 → Filed with AG: Oct 23, 2020	79d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 6 states

View merged incident ↗

Montana State AGOct 23 · first

Maine State AGOct 23 · first · this page

Indiana State AG+17d

Oregon State AG+18d

Maine State AG+55d

New Hampshire State AG+59d

California State AG+61d

Pattern: first filing Oct 23 (MT), last Dec 23 (CA) — a 61-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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/2623621b-b57f-486f-8108-995dc4f92534.shtml
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 23, 2020
Raw hash: 7113480c976d59bd43f0309727e08143895235e03c46ea13ad746fd728087f0e

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityULTRA CLEAN HOLDINGS, INC.

Victim entityULTRA CLEAN HOLDINGS, INC.

Incidentdiscovered Aug 5, 2020

Stated responseSent written notification to affected individuals

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov