Defense Evasion (TA0005)(external, opens in a new tab or window)
Initial Access (TA0001)(external, opens in a new tab or window)
text code block:process where host.os.type == "windows" and event.type == "start" and process.executable : "?:\\Users\\*\\Downloads\\*" and not process.code_signature.status like ("errorCode_endpoint*", "errorUntrustedRoot", "errorChaining") and process.hash.sha256 != null and ( /* Slack */ (process.name : "*slack*.exe" and not (process.code_signature.subject_name in ( "Slack Technologies, Inc.", "Slack Technologies, LLC" ) and process.code_signature.trusted == true) ) or /* WebEx */ (process.name : "*webex*.exe" and not (process.code_signature.subject_name in ("Cisco WebEx LLC", "Cisco Systems, Inc.") and process.code_signature.trusted == true) ) or /* Teams */ (process.name : "teams*.exe" and not (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) ) or /* Discord */ (process.name : "*discord*.exe" and not (process.code_signature.subject_name == "Discord Inc." and process.code_signature.trusted == true) ) or /* WhatsApp */ (process.name : "*whatsapp*.exe" and not (process.code_signature.subject_name in ( "WhatsApp LLC", "WhatsApp, Inc", "24803D75-212C-471A-BC57-9EF86AB91435", /* WhatsApp Installer - MS Store */ "Microsoft Corporation" ) and process.code_signature.trusted == true) ) or /* Zoom */ (process.name : ("*zoom*installer*.exe", "*zoom*setup*.exe", "zoom.exe") and not (process.code_signature.subject_name in ( "Zoom Video Communications, Inc.", "Zoom Communications, Inc." ) and process.code_signature.trusted == true) ) or /* Outlook */ (process.name : "*outlook*.exe" and not ( (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) or ( process.name: "MSOutlookHelp-PST-Viewer.exe" and process.code_signature.subject_name == "Aryson Technologies Pvt. Ltd" and process.code_signature.trusted == true ) ) ) or /* Thunderbird */ (process.name : "*thunderbird*.exe" and not (process.code_signature.subject_name == "Mozilla Corporation" and process.code_signature.trusted == true) ) or /* Grammarly */ (process.name : "*grammarly*.exe" and not (process.code_signature.subject_name == "Grammarly, Inc." and process.code_signature.trusted == true) ) or /* Dropbox */ (process.name : "*dropbox*.exe" and not (process.code_signature.subject_name == "Dropbox, Inc" and process.code_signature.trusted == true) ) or /* Tableau */ (process.name : "*tableau*.exe" and not (process.code_signature.subject_name == "Tableau Software LLC" and process.code_signature.trusted == true) ) or /* Google Drive */ (process.name : "*googledrive*.exe" and not (process.code_signature.subject_name == "Google LLC" and process.code_signature.trusted == true) ) or /* MSOffice */ (process.name : "*office*setup*.exe" and not (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) ) or /* Okta */ (process.name : "*okta*.exe" and not (process.code_signature.subject_name == "Okta, Inc." and process.code_signature.trusted == true) ) or /* OneDrive */ (process.name : "*onedrive*.exe" and not (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) ) or /* Chrome */ (process.name : "*chrome*.exe" and not (process.code_signature.subject_name in ("Google LLC", "Google Inc") and process.code_signature.trusted == true) ) or /* Firefox */ (process.name : "*firefox*.exe" and not (process.code_signature.subject_name == "Mozilla Corporation" and process.code_signature.trusted == true) ) or /* Edge */ (process.name : ("*microsoftedge*.exe", "*msedge*.exe") and not (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) ) or /* Brave */ (process.name : "*brave*.exe" and not (process.code_signature.subject_name == "Brave Software, Inc." and process.code_signature.trusted == true) ) or /* GoogleCloud Related Tools */ (process.name : "*GoogleCloud*.exe" and not (process.code_signature.subject_name == "Google LLC" and process.code_signature.trusted == true) ) or /* Github Related Tools */ (process.name : "*github*.exe" and not (process.code_signature.subject_name == "GitHub, Inc." and process.code_signature.trusted == true) ) or /* Notion */ (process.name : "*notion*.exe" and not (process.code_signature.subject_name == "Notion Labs, Inc." and process.code_signature.trusted == true) ) )
Install detection rules in Elastic Security
Detect Potential Masquerading as Business App Installer in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).