Secret Service agent put suspicious USB stick taken from Chinese Mar-a-Lago intruder in his computer, triggering immediate download of malware

‘Out-of-the-ordinary’ incident revealed by agent during Yujing Zhang’s detention hearing

Chinese national Yujing Zhang attempted to gain entry to Donald Trump’s Mar-a-Lago club (Getty)

A US Secret Service agent put a USB drive taken from a Chinese woman who tried to gain access to Donald Trump’s private Florida club into his government computer, triggering an immediate download of malicious software.

The “very out-of-the-ordinary” incident was revealed by another Secret Service agent, Samuel Ivanovich, who testified on Monday at a detention hearing against Yujing Zhang, a 32-year-old Chinese national arrested late last month for trying to enter Mar-a-Lago.

According to an affidavit filed by an agent and seen by the Miami Herald, Ms Zhang gave the Secret Service conflicting accounts of why she went to the US president’s club on 30 March.

She was found carrying several electronic devices, including a USB stick containing “malicious malware”. That raised suspicions among investigators Ms Zhang may be spying, the newspaper reported.

One federal prosecutor argued in court Ms Zhang “lies to everyone she encounters”, and said a search of her hotel room uncovered more than $8,000 (£6,120) in cash, nine thumb drives, five SIM cards and a “signal-detector” – a portable device than can detect hidden cameras.

Mr Ivanovich, who interviewed Ms Zhang the day she was arrested, told the Florida court a colleague who inserted the USB drive into his computer had to immediately stop the analysis to prevent any further corruption of his computer, according to CNN. The analysis was ongoing but inconclusive, he said.

The FBI has reportedly launched a counterintelligence investigation, but Ms Zhang’s lawyer, Robert Adler, said evidence his client had paid for a travel package that included a visit to Mar-a-Lago could weaken any allegation she lied to agents about the trip.

One reason she allegedly gave was that she had been invited to a social event promoted online by Li Yang, a Florida massage parlour owner who ran a separate business touting her clients access to the Trump administration at Mar-a-Lago.

The court hearing was held to rule on whether Ms Zhang should be released on bond, but judge William Matthewman delayed any decision until next week. Ms Zhang is currently detained in Palm Beach County jail.

Ms Zhang is facing charges of lying to a federal office and entering restricted property. She is not facing charges of espionage.

There is no indication Ms Zhang is connected to Chinese intelligence, but her arrest has reignited concerns, especially among Democrats, that Mr Trump’s use of Mar-a-Lago constitutes a security risk as long as members and guests are allowed to come in and out while he is there.