The U.S. Department of the Treasury’s Office of Foreign Assets Control (OFAC) has imposed sanctions on an Uzbek citizen over alleged involvement in cybercrime activities linked to Russian actors, according to an official press release published on the agency’s website.
OFAC reported that Azizjon Mamashoyev, a citizen of Uzbekistan born in 1987, was added to the sanctions list under regulations related to Russia-linked activities. U.S. authorities allege that he participated in cyber operations and maintained connections with individuals suspected of conducting malicious cyber activities.
The announcement included identifying details, listing Mamashoyev’s date of birth as February 20, 1987, and confirming his Uzbek nationality. The designation was issued under the Ukraine-/Russia-Related Sanctions Regulations and forms part of measures targeting cyber-enabled threats.
According to OFAC, Mamashoyev is linked to Sergey Zelenyuk, who has also been associated with cybercrime investigations. The sanctions were introduced pursuant to authorities under the Countering America’s Adversaries Through Sanctions Act (CAATSA) and a cyber-related sanctions program identified as CYBER4.
The U.S. Treasury also designated Advance Security Solutions, a company reportedly connected to Mamashoyev. The firm, described as operating in computer programming, is registered in Dubai’s Jumeirah Living Marina Gate area and also lists operations in Tashkent. U.S. officials stated that the company was established in 2025 and may have engaged in activities posing secondary sanctions risks.
Under OFAC sanctions, designated individuals and entities are generally subject to asset freezes within U.S. jurisdiction, and U.S. persons are typically prohibited from engaging in transactions with them.
