What is the ruling of Sharia on money acquired through defrauding a company, and then American banks, under the claim of "jihad against infidels and Zionists"?

Unlawfully consuming people's wealth is a grave evil that is impermissible for a Muslim. This includes the wealth of a Muslim and the wealth of a non-Muslim who is at peace with Muslims. Repentance is obligatory, and the money must be returned to its owners if it was private property. If it was public property, it should be spent on public welfare projects with the intention of ridding oneself of unlawful wealth. What your companion advised is incorrect guidance and could lead to great harm.