Zero Day: A Novel by Mark Russinovich, Howard Schmidt

He’d sniffed once before realizing it came from her. She’d said, “I know. A disgusting habit. I just have to quit.”
    At one point some hours into the process, Harold disappeared. It could have been the middle of the night or broad daylight. Jeff had no idea. But when Harold returned with food from the all-night diner, Jeff realized how hungry he was. He wolfed down a ham-and-cheese sandwich just as the new framework dropped the unencrypted copy of the code onto his disk. He chewed as he analyzed it.
    So far, he had discovered mostly negatives. The single most troubling development had been an attempt by the virus to replicate itself. In this case, it had failed, but, he realized, in other environments it might well be succeeding. It didn’t affect what he was doing today, though it could mean disaster for thousands of other businesses. But that was in the future. Right now he had to concentrate on what he was getting paid to do. As he finished the food and wiped his hands on a napkin, Jeff mentally groaned at what he saw. Even the decrypted code he’d labored so long to produce was obtuse. The cracker was using tricks that ran in the low-level environment. That meant that this approach was a dead end.
    Jeff didn’t realize that Sue had been gone until she reentered the room. She came up behind him and leaned down at a time when he had his screen filled with the string output. Her proximity reminded him for a moment that she was an attractive woman. But almost as quickly as the sensation came, it vanished. It had happened before when he’d been drawn to a woman. He knew the shutting down of his emotions was related to Cynthia’s death, and the guilt he felt about not having done more to prevent it.
    But nothing would ever change what had happened.
    His BlackBerry rang, snapping him out of his gloom. “Excuse me,” he muttered to Sue, as he answered.
    Sue took the opportunity to examine Jeff much more closely as he listened to his caller. She’d been attracted from the start and, having watched him work, was now even more impressed. Now she could take him in as a man and liked what she saw. She wondered if he mixed business with pleasure. In her experience, most men did, given the chance.
    “I’m in Manhattan too, on a system crash. I’ve never seen anything like it. I’m sorry to hear about the deaths.” Jeff paused. “Sure, sure. That sounds good, Daryl. Maybe I’ll know something by then.” Slipping his BlackBerry back in his pocket, he looked up at Sue. “Sorry about that. A colleague. She’s in town working on something similar.”
    “She’s obviously dedicated. It’s the middle of the night. Could it be the same virus?”
    Jeff considered what Daryl had told him. “It’s possible, except her virus didn’t crash the system. Just caused it to malfunction in a deadly way.”
    “I guess we should be thankful no one’s died even with all the problems we’re having. This could be a lot worse. Any luck? You’ve been at this for some time, and I thought I worked long hours.”
    Jeff grinned. “It’s why I get the big bucks. I may not solve the problem, but they can’t complain about the time I put in.” Jeff’s smile vanished. “What I’ve found so far isn’t making much sense.”
    “Any guesses?”
    “Unfortunately, a few.” Leaning back in his chair, Jeff folded his arms across his chest. “So far, whatever you contracted isn’t a known variant of a virus. It doesn’t look very sophisticated, since it killed itself, and in probability is a cut-and-paste job at its core. But it was plenty destructive. It wanted to replicate, which is bad news for other computers. It’s also encrypted and deeply embedded, which is making my job very tough. From how some of the code is written, I can speculate that the author may be Russian. If true, that’s not reassuring at all. The Russian Mafia is heavily involved in financial fraud through malware.”
    Jeff stopped and thought about the