Process Proxy Execution Via Squirrel.EXE
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About the rule
Rule Type
Standard
Rule Description
Detects the usage of the "Squirrel.exe" binary to execute arbitrary processes. This binary is part of multiple Electron based software installations (Slack, Teams, Discord, etc.)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\squirrel.exe,\update.exe" AND COMMANDLINE contains "--processStart,--processStartAndWait,--createShortcut") AND ((COMMANDLINE notcontains ":\Users" OR COMMANDLINE notcontains "\AppData\Local\Discord\Update.exe" OR COMMANDLINE notcontains " --processStart" OR COMMANDLINE notcontains "Discord.exe") AND ((COMMANDLINE notcontains ":\Users" OR COMMANDLINE notcontains "\AppData\Local\GitHubDesktop\Update.exe" OR COMMANDLINE notcontains "GitHubDesktop.exe") OR COMMANDLINE notcontains "--createShortcut,--processStartAndWait") AND ((COMMANDLINE notcontains ":\Users" OR COMMANDLINE notcontains "\AppData\Local\Microsoft\Teams\Update.exe" OR COMMANDLINE notcontains "Teams.exe") OR COMMANDLINE notcontains "--processStart,--createShortcut") AND ((COMMANDLINE notcontains ":\Users" OR COMMANDLINE notcontains "\AppData\Local\yammerdesktop\Update.exe" OR COMMANDLINE notcontains "Yammer.exe") OR COMMANDLINE notcontains "--processStart,--createShortcut")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems), Karneades / Markus Neis, Jonhnathan Ribeiro, oscd.community
