The alleged recipient of the funds was an American citizen in his early 30s who had been arrested more than a year ago in Maryland after a lengthy Federal Bureau of Investigation surveillance operation that found the first clues to the suspected network.
The government had alleged in a 2016 indictment that the American suspect, Mohamed Elshinawy, pledged allegiance to Islamic State and had pretended to sell computer printers on eBay as a cover to receive payments through PayPal, potentially to fund terror attacks.
The recently unsealed FBI affidavit, filed in federal court in Baltimore, alleges that Elshinawy was part of a global network stretching from Britain to Bangladesh that used similar schemes to fund Islamic State and was directed by a now-dead senior ISIS figure in Syria, Siful Sujan.
The U.S. has said Elshinawy told investigators he was instructed to use the money for "operational purposes" in the U.S., such as a possible terror attack. He has pleaded not guilty to supporting the terror group, and currently is in federal custody awaiting trial. His lawyer declined to comment.
The case suggests how Islamic State is trying to exploit holes in the vast online financial world to finance terror outside its borders.
The U.S. and other countries for years since 9/11 have focused on the formal international banking systems that terror networks might use to transfer money to would-be terrorists.
But some alleged perpetrators inspired by Islamic State have gotten small sums through low-level fraud such as check scams, or through financial channels where regulators have been paying less attention.
Those include social-media fundraising, student-loan withdrawals and online lending fraud, according to the Financial Action Task Force, an intergovernmental body that makes counterterror recommendations.
That is making it more challenging for law enforcement to spot and stop terror attacks and terrorism recruits. A former Treasury official equated policing terror funding in the burgeoning financial marketplace to "looking for a needle in a massive haystack."
A spokesman for eBay Inc. said the company "has zero tolerance for criminal activities taking place on our marketplace" and said that they are working with law enforcement on the case.
A spokeswoman for PayPal Holdings Inc. said that it "invests significant time and resources in working to prevent terrorist activity on our platformhellip;.We proactively report suspicious activities and respond quickly to lawful requests to support law enforcement agencies in their investigations."