Flipper Zero as a Purple Team Tool: Beyond the Toy Reputation
Media coverage made Flipper Zero famous for the wrong reasons. Headlines about car theft and hotel locks missed the point: this is a field instrument for security professionals doing authorized work, and the ecosystem around it has matured significantly since its 2022 release.
Our Flipper_Zero repository has accumulated 1,373 stars because practitioners — not script kiddies — find it useful. Here's how we actually use it.
The Four Attack Surfaces Flipper Covers
1. Sub-GHz (300 MHz – 928 MHz)
This is where Flipper earns its keep on physical assessments. Static-code devices in this band are still common:
- Legacy HVAC control panels with wireless override
- Parking lot barrier arms at older facilities
- Wireless doorbells and simple alarm motion detectors
- Some industrial wireless sensors broadcasting plaintext
The Flipper can capture, save, and replay static codes. Our flipper-zero-rf-jammer repo (569+ stars) extends this to disruption testing for authorized noise resilience assessments — simulating environments where a building's wireless controls are being jammed.
2. NFC / RFID
Mifare Classic badges are still deployed at a surprising number of facilities. Flipper reads them in seconds. More importantly, it supports Mifare DESFire EV1 in read mode, helping assessors determine whether a client's access control system is actually using the security features the vendor advertised.
Key findings we've documented:
- Facilities with DESFire hardware but Mifare Classic-level authentication (misconfiguration)
- HID iClass badges with default keys still active
- Outdated Hitag2 keyfobs with known-broken crypto
3. Infrared
This sounds trivial until you realize that:
- Building automation panels often use IR remotes
- Conference room projectors and displays can be locked/unlocked via IR sequences
- Some elevator control panels accept IR input
FlipperZero's IR library contains hundreds of device codes, and the signal capture function lets you grab novel codes on-site.
4. Bad USB
Flipper presents as a USB HID device and executes DuckyScript payloads. For purple team work, this is useful for testing:
- Endpoint detection response to keystroke injection
- Whether locked screens can be bypassed by HID automation
- USB policy enforcement gaps
Firmware Ecosystem
Stock firmware is conservative. The community has built forks with expanded capabilities for authorized testing contexts:
- Unleashed: Removes regional frequency restrictions for international assessors
- RogueMaster: Adds community applications and expanded protocol support
- xtreme: Performance-focused with additional sub-GHz protocols
All listed in our repo alongside notes on which firmware is appropriate for which assessment context.
Documentation Discipline
Every Flipper capture gets logged with:
- Timestamp and GPS coordinates
- Authorization reference (engagement ID)
- Protocol identification
- Whether the device was actively used or passively captured
This protects the operator and creates an evidence trail for the client report.
Where Flipper Fits vs. HackRF
FlipperZero is the close-quarters instrument. HackRF is the distance tool. In a standard physical assessment, we carry both — HackRF for the exterior sweep and spectrum analysis, Flipper for interactive work at access points and control panels once we're inside authorized scope.
Both repositories in our arsenal exist to support professional security work. The tools are neutral. Authorization and documentation are what make the difference.