The logic bomb was embedded with legitimate code and set to launch at 9 a.m. on Jan. 31, but was impeded when another Fannie Mae engineer discovered the malware several days after it was planted.

The company used these spreadsheets to manage orders for electrical equipment. Tinley planted so-called "logic bombs" in the spreadsheets, the government alleged. Logic bombs are bits of malicious ...

A contractor has pleaded guilty to planting a "logic bomb" in a client's software in a bid to receive extra work from the company every few years. David Tinley, a 62-year-old contract programmer ...