WASHINGTON — Security firm IntelCrawler said Friday that it has identified a Russian teenager as the author of the malware probably used in the cyberattacks against Target and Neiman Marcus, and that it expects more retailers to acknowledge that their systems were breached.

In a report posted online, the Sherman Oaks, Calif., company said the author of the malware used in the attacks has sold more than 60 versions of the software to cybercriminals in Eastern Europe and other countries.

The firm said the 17-year-old has roots in St. Petersburg. He reportedly has a reputation as a ‘‘very well known’’ programmer in underground marketplaces for malicious code, the report said.