Query: alert when Detects a suspicious download using the BITS client from a FQDN that is unusual. Adversaries may abuse BITS jobs to pers
Matching passage: Sigma rule: Detects a suspicious download using the BITS client from a FQDN that is unusual. Adversaries may abuse BITS jobs to pers. Logsource: windows / bits-client. Rule: title: BITS Transfer Job With Uncommon Or Suspicious Remote TLD id: 6d44fb93-e7d2-475c-9d3d-54c9c1e33427 status: test description: Detects a suspicious download using the BITS client from a FQDN that is unusual. Adversaries may abuse BITS jobs to persistently execute or clean up after malicious payloads. references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md - https://twitter.com/malmoeb/status/1535142803075960832 author: Florian Roth (Nextron Systems) date: 2022-06-10 modified: 2025-02-28 tags: - attack.persistence - attack.execution - attack.stealth - attack.t1197 logsource: product: windows service: bits-client detection: selection: EventID: 16403 filter_main_generic: RemoteName|contains: - .azureedge.net/ - .com/ - .sfx.ms/ - download.mozilla.org/ - cdn.onenote.net/ - cdn.office.net/ - tscdn.m365.static.microsoft/ condition: selection and not 1 of filter_main_* falsepositives: - This rule doesn't exclude other known TLDs such as ".org" or ".net". It's recommended to apply additional filters for software and scripts that leverage the BITS service level: medium
Near-miss 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