Both hackers and antivirus makers were put on notice last week when two shining stars in the $67 billion worldwide cyber-security universe announced their merger. Milpitas, Calif.-based global network security company FireEye has acquired Washington, D.C.-based cyber-security firm Mandiant, which released a famous report last year about a Chinese military unit that allegedly pilfered data from at least 115 companies across major U.S. industries.
“There is an accelerating awareness that just....