Submission + - Working Palm OS Virus Rediscovered After 25 Years (linkedin.com)
Named "Virii," the virus intercepted Palm OS system calls to progressively infect legitimate applications while preserving their original functionality. Infected applications could then spread between handheld devices through infrared beaming, potentially allowing an infection to propagate among hundreds of developers exchanging software at the conference.
The virus also included a date-triggered payload designed to interfere with system time reporting between October 23 and 27, 2001, potentially causing erratic clocks, unreliable alarms, and missed appointments. Following the September 11 terrorist attacks, PalmSource 2001 was postponed until February 2002, and the experiment never went ahead. The virus was never publicly released.
In 2016, Ardiri mentioned the experiment in a retrospective about his involvement in the infamous Palm OS Liberty Trojan incident, believing the original source code had been lost. In October 2026, he rediscovered the complete implementation on a CompactFlash card containing files dated June 2001.
The newly published retrospective documents the original infection mechanism, potential conference-wide propagation, and historical context. The functional source code and binaries will remain private.