From
Haaretz:
The mystery continues to deepen over the origin of one of the world's most damaging computer viruses -- Stuxnet -- which some experts believe is targeted at Iran's nuclear power plants, slowing that country's quest for a nuclear weapon.
On Tuesday, a German computer specialist offered a hint that Israel may be behind the sophisticated malware, by demonstrating that a file inside the code uses the word "Myrtus" -- which could be a reference to the Book of Esther, the Old Testament story about how the Jews prevented a nefarious plot by the Persians, according to the New York Times.
The next day, a trio of security researchers offered another clue at a conference in Vancouver, describing how Stuxnet includes references to the 1979 execution of the leader of Iran's Jewish community at the time. Specifically, the researchers from Symantec -- Nicolas Falliere, Liam O Murchu and Eric Chen -- showed that the code includes a marker with the numbers "19790509" which, if prompted, stops the code from infecting a targeted computer.