In addition to encrypting a victim's files, the STOP ransomware family has also started to install the Azorult password-stealing Trojan on victim's computer to steal account credentials, cryptocurrency wallets, desktop files, and more.
The Azorult Trojan is a computer infection that will attempt to steal usernames and passwords stored in browsers, files on a victim's desktop, cryptocurrency wallets, Steam credentials, browser history, Skype message history, and more. This information is then uploaded to a remote server that is under the control of the attacker.
When we first covered the DJVU variant of the STOP Ransomware being distributed by fake software cracks in January, we noted that when the malware was executed it would download various components that are used to perform different tasks on a victim's computer. These tasks include showing a fake Windows Update screen, disabling Windows Defender, and blocking access to security sites by adding entries to Windows's HOSTS file.