Citadel is like the sneaky digital offspring of the infamous ZeuS malware, born in 2012 when its parent’s secret code was spilled online. When ZeuS’s secret recipe got leaked online, cyber baddies took it, tweaked it, and made it even nastier! What does Citadel do? It’s all about stealing your private info, especially that precious banking and financial stuff. Yikes!

But wait, there’s more! Citadel can also run other types of nasty software, like ransomware (holding your files hostage) or scareware (making you freak out). So, it’s like a Swiss Army knife for online troublemakers.