Accuracy is Dolan.

If you are interested why I have a VAC Ban, here's the story.

I had not been using this account for more than 40 days before it got hijacked. On February 10th, 2016, it had been brought to my attention that the account was stolen and used by someone else. Judging from the "last played" dates, the hijacker had been using this account at least since February 7th, 2016. The hijacker also bought some games and CS:GO items, most likely using the Steam Wallet money I had in my account before the 40-day break.

I contacted Steam Support. They reacted immediately, and I got my account back quickly. All the purchases and transactions I was not responsible for were successfully refunded. It's all good, isn't it?

Well, it turned out the hijacker's favourite game was Counter-Strike: Global Offensive. He managed to lose 2 competitive matches and got 3 cooldowns. I watched the replays, and it was obvious he had been been wallhacking all the time. Oh, yes, the hijacker was Russian, of course. About a week later, I received a VAC Ban from CS:GO.

Steam Support will only confirm the ban, they will not remove it. It doesn't matter who was using the account, it only matters that a cheat was used on the account. On the one hand, using cheats results in a penalty, and that's good news. Bad news is the fact that account theft has become epidemic (77,000 accounts are hijacked and pillaged every month, source: http://store.steampowered.com/news/19618/) . The ban delay was about a week long, meaning that the hijacker could have had a few more days to ruin competitive matches if I hadn't regained access to my account. Not every hacker looks like a hacker, they don't necessarily single-handedly carry the whole team during the whole match, and win 16-0. They may look like normal players who just know the map well and have great game sense. It's worth mentioning that hacking and piracy in Russian Federation is out of control. It's obvious that games such as Dota 2 and Counter-Strike: Global Offensive are extremely popular among Russian gamers, it's obvious they suck at them and try to gain an unfair advantage. Given the epidemic account theft, a good number of reasons to steal your account, a huge amount of Russians in Dota 2 and CS:GO and the fact that Russia is a happy haven for hackers and thieves, multiply everything by about 77,000.

If you are reading this, if you have CS:GO or Dota 2 in your library, if you have any other "weight" which costs some money, they may be targeting your account right now. Protect it as much as you can. Enable Steam Guard two-factor authentication. Verify your mail address. Use two-factor authentication for your email. Avoid weird trade offers. Learn to distinguish phishers. And help making Steam a better place by reporting phishing and any other suspicious actions.
Speaking of CS:GO and Dota 2, think twice before playing these games. It's safe to say the odds of getting thrown into a match with hackers are high enough.