Query: rule covering Detects suspicious child processes spawned from browsers. This could be a result of a potential web browser exploitation
Matching passage: Sigma rule: Detects suspicious child processes spawned from browsers. This could be a result of a potential web browser exploitation. Logsource: macos / process_creation. Rule: title: Suspicious Browser Child Process - MacOS id: 0250638a-2b28-4541-86fc-ea4c558fa0c6 status: test description: Detects suspicious child processes spawned from browsers. This could be a result of a potential web browser exploitation. references: - https://fr.slideshare.net/codeblue_jp/cb19-recent-apt-attack-on-crypto-exchange-employees-by-heungsoo-kang - https://github.com/elastic/detection-rules/blob/4312d8c9583be524578a14fe6295c3370b9a9307/rules/macos/execution_initial_access_suspicious_browser_childproc.toml author: Sohan G (D4rkCiph3r) date: 2023-04-05 tags: - attack.initial-access - attack.execution - attack.t1189 - attack.t1203 - attack.t1059 logsource: category: process_creation product: macos detection: selection: ParentImage|contains: - com.apple.WebKit.WebContent - firefox - Google Chrome Helper - Google Chrome - Microsoft Edge - Opera - Safari - Tor Browser Image|endswith: - /bash - /curl - /dash - /ksh - /osascript - /perl - /php - /pwsh - /python - /sh - /tcsh - /wget - /zsh filter_main_generic: CommandLine|contains: --defaults-torrc filter_main_ms_autoupdate: CommandLine|contains: /Library/Application Support/Microsoft/MAU*/Microsoft AutoUpdate.app/Contents/MacOS/msupdate filter_main_chrome: ParentImage|contains: - Google Chrome Helper - Google Chrome CommandLine|contains: - /Volumes/Google Chrome/Google Chrome.app/Contents/Frameworks/*/Resources/install.sh - /Applications/Google Chrome.app/Contents/Frameworks/Google Chrome Framework.framework/*/Resources/keystone_promote_preflight.sh - /Applications/Google Chrome.app/Contents/Frameworks/Google Chrome Framework.framework/*/Resources/keystone_promote_postflight.sh filter_main_ms_edge: ParentImage|contains: Microsoft Edge CommandLine|contains: - IOPlatformExpertDevice - hw.model filter_main_chromerecovery: ParentImage|contains: - Google Chrome Helper - Google Chrome CommandLine|contains|all: - /Users/ - /Library/Application Support/Google/Chrome/recovery/ - /ChromeRecovery filter_optional_null: CommandLine: null filter_optional_empty: CommandLine: '' condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Legitimate browser install, update and recovery scripts level: medium
Near-miss passage: Sigma rule: Detects Bitsadmin connections to domains with uncommon TLDs. Logsource: proxy. Rule: title: Bitsadmin to Uncommon TLD id: 9eb68894-7476-4cd6-8752-23b51f5883a7 status: test description: Detects Bitsadmin connections to domains with uncommon TLDs references: - https://twitter.com/jhencinski/status/1102695118455349248 - https://isc.sans.edu/forums/diary/Investigating+Microsoft+BITS+Activity/23281/ author: Florian Roth (Nextron Systems), Tim Shelton date: 2019-03-07 modified: 2023-05-17 tags: - attack.command-and-control - attack.execution - attack.stealth - attack.t1071.001 - attack.persistence - attack.t1197 - attack.s0190 logsource: category: proxy detection: selection: c-useragent|startswith: Microsoft BITS/ falsepositives: cs-host|endswith: - .com - .net - .org - .scdn.co - .sfx.ms condition: selection and not falsepositives falsepositives: - Rare programs that use Bitsadmin and update from regional TLDs e.g. .uk or .ca level: high