The project team of a Tier-1 automotive supplier in the Marmara region received an email appearing to come from the purchasing office of the European OEM they work with: "Revised technical specification for the new platform program attached; share your current tooling cost tables and quotation within 48 hours." The email contained the OEM's real project code and the correct engineer names. The team sent the cost tables and design documents. Two weeks later, in the same tender, they faced a competitor pricing just barely below their own numbers. The sender address differed by a single letter.
Automotive carries a distinctive attack surface for email threats: a deep supply chain stretching from the OEM to Tier-3, intense project-based technical correspondence, hard deadline pressure, and priceless intellectual property (designs, tooling, costs). In this article we cover the threat vectors specific to automotive and the path to defense.
1. Why Is the Automotive Supply Chain a Unique Target?
In automotive, no company works alone: the OEM, Tier-1, Tier-2, Tier-3, and logistics partners run continuous, intense email traffic. This structure has three natural weaknesses:
- The weakest link of the chain is the target. OEMs and large Tier-1s have relatively mature security; the attacker therefore compromises a small Tier-2/Tier-3 and climbs up the chain. The compromised small supplier's account looks "familiar and trustworthy" to the OEM.
- Deadline pressure kills verification. In a culture of "penalties per minute if the line stops," 48-hour quotation requests and urgent revisions are ordinary. Urgency is the favorite terrain of quishing and BEC.
- Project codes and engineer names are no secret. LinkedIn, trade-fair attendee lists, and supplier portals hand the attacker everything needed to write "like an insider."
2. Four Threat Vectors Specific to Automotive
2.1 IP Leakage via OEM/Tier Impersonation
The opening scenario. The attacker impersonates the OEM's purchasing office or an upper Tier and requests technical drawings, tooling data, cost tables. In automotive, competitive advantage lies exactly in these documents; their leakage means direct tender loss and years of competitive damage.
2.2 Supplier Invoice Fraud — Inside the Chain
The automotive version of the fake-IBAN attack we see across manufacturing is more dangerous because payment relationships in the chain are continuous and the amounts are large. An "account change" email sent from a compromised Tier-2 account to a Tier-1 slips inside a genuine commercial relationship running for years. For the detailed mechanism, see our manufacturing sector article.
2.3 Project-Based BEC: "Program Manager" Pressure
The automotive adaptation of classic CEO fraud: the impersonated figure is not the CEO but the OEM's program/project manager. Themes like "missing documents before the audit," "payment for an urgent sample shipment," "approve this before the penalty is issued" weaponize the deadline culture.
2.4 Portal Impersonation and Credential Harvesting
OEM supplier portals (EDI, quality, ordering systems) are the veins of automotive. Phishing themed "your portal password is expiring" and QR-based quishing attempts directly target these portal credentials. An attacker who enters the portal sees orders, shipment plans, and quality data.
3. Field Note: The Pattern We See in Türkiye's Automotive Cluster
Our recurring observation in Türkiye's automotive cluster (concentrated in Marmara) is this: attacks almost always ride the rhythm of a real project cycle. Specification/cost requests spike during quotation periods, "urgent revision" emails during the transition to serial production, payment-redirection attempts during year-end price negotiations. The attacker knows the industry's calendar and times accordingly.
A second observation: at the Tier-2/Tier-3 level, DMARC is almost nonexistent. This both makes those companies easy to impersonate and exploits the trust that firms higher in the chain place in emails "from a familiar supplier."
4. Defense: Three Layers with Chain Awareness
Process
Two rules: (1) Bank/IBAN changes and payments above a certain amount are not processed without confirmation through a second channel independent of email. (2) Requests for technical documents (designs, tooling, costs) are verified through the OEM's official portal/project channel, no matter how familiar the requesting address looks.
Technology
Check Point Harmony Email & Collaboration provides the following in automotive scenarios:
- Look-alike domain detection — flags newly registered domains resembling your OEM or supplier by a single letter.
- Correspondence-pattern learning — contextually flags deviation from the tone and request types of a years-long OEM/Tier relationship (a sudden cost-table request, unusual urgency).
- QR decode + URL analysis — catches portal-impersonation quishing attempts from inside the image. See our quishing article for detail.
- DLP — prevents sensitive content like technical drawings and cost tables from going to the wrong recipient/domain (Complete Protect).
- Internal and outbound email scanning — sees the attack coming to you from, or leaving you toward, a compromised chain account.
People
Sector-specific simulations for project teams and purchasing: a fake OEM specification request, a fake portal password email, fake deadline-penalty pressure. Not generic phishing training — automotive's real scenarios.
Frequently Asked Questions
Our OEM already runs strict security audits (TISAX etc.) — isn't that enough?
Frameworks like TISAX audit information security management and are very valuable; but they don't stop targeted BEC/quishing attacks in daily email traffic in real time. A compliance framework and operational email protection complement each other; they don't substitute.
We're a small Tier-2/Tier-3 — are we a target when we're not an OEM?
You're a target precisely because of that: the attacker picks the weakest link to climb the chain. Your compromised account becomes the door to the OEM and Tier-1. As your position in the chain gets smaller, your target value doesn't drop — your ease of attack rises.
Our technical documents already go through the portal — why does email risk persist?
In practice, urgent revisions, sample approvals, and cost updates still circulate heavily by email. Moreover, the portal credentials themselves are stolen via email (phishing/quishing) — your portal's security cannot be considered separately from your email's security.
Can we measure what our current protection misses in automotive scenarios?
Yes. In a 14-day monitor-mode trial, without touching your existing protection, we report the missed threats — including OEM/supplier impersonation, look-alike domains, and quishing.
What Should You Do Now?
If you run intense email traffic with OEMs or the Tier chain and technical-document/payment requests circulate by email, your chain-borne risk is worth measuring.
- Free Field Audit: An SPF/DKIM/DMARC report card for your domain (and, if you wish, your critical suppliers), look-alike domain risks, and your exposure surface.
- 14-Day Check Point Trial (monitor mode): The missed threats in your chain traffic, reported without touching anything.
About this article: Kinetik Bilişim is the Türkiye partner of Check Point Software Technologies at the Advanced Partner 2026 level, holding Email, Endpoint & Browser, Mobile, and SASE Solution Specialization accreditations. The author, Kemal Özleyen, is a cybersecurity engineer certified as a Check Point Workspace Security Expert. Field scenarios are shared in anonymized form from cases seen among our customers in Türkiye's automotive cluster.
