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Stealer One is a credential-stealing malware family associated with FIN6. It has been used to harvest stored credentials from web browsers as well as from e-mail and file transfer applications, including FTP utilities. The reported activity indicates a focus on extracting saved account data from common user applications to support follow-on intrusion activity such as account compromise and broader post-compromise access. Based on the available information, Stealer One is best characterized as an infostealer targeting user credential stores on Windows systems.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
FIN6 has used the Stealer One credential stealer to target web browsers.
2 distinct techniques documented for this family, organized by ATT&CK tactic.
Agent Tesla can gather credentials from a number of browsers... APT33 has used a variety of publicly available tools like LaZagne to gather credentials... TrickBot can obtain passwords stored in files from web browsers such as Chrome, Firefox, Internet Explorer, and Microsoft Edge... SELECT action_url, username_value, password_value FROM logins; CryptUnprotectData
Agent Tesla can gather credentials from a number of browsers... APT3 has used tools to dump passwords from browsers... APT41 used BrowserGhost, a tool designed to obtain credentials from browsers, to retrieve information from password stores... TrickBot can obtain passwords stored in files from web browsers such as Chrome, Firefox, Internet Explorer, and Microsoft Edge
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Credential stealer used to target browser-stored credentials.
Credential stealer used to target email and file transfer utilities including FTP.
Credential stealer used to target web browsers.
Credential stealer used to target web browsers.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.