Query: Sigma YAML for windows / network_connection
Matching passage: Sigma rule: Detects external IP address lookups by non-browser processes via services such as "api.ipify.org". This could be indicat. Logsource: windows / network_connection. Rule: title: Suspicious Network Connection to IP Lookup Service APIs id: edf3485d-dac4-4d50-90e4-b0e5813f7e60 related: - id: ec82e2a5-81ea-4211-a1f8-37a0286df2c2 type: derived status: test description: Detects external IP address lookups by non-browser processes via services such as "api.ipify.org". This could be indicative of potential post compromise internet test activity. references: - https://github.com/rsp/scripts/blob/c8bb272d68164a9836e4f273d8f924927f39b8c6/externalip-benchmark.md - https://www.cisa.gov/news-events/cybersecurity-advisories/aa20-302a - https://thedfirreport.com/2022/11/28/emotet-strikes-again-lnk-file-leads-to-domain-wide-ransomware/ - https://www.trendmicro.com/en_us/research/23/e/managed-xdr-investigation-of-ducktail-in-trend-micro-vision-one.html author: Janantha Marasinghe, Nasreddine Bencherchali (Nextron Systems) date: 2023-04-24 modified: 2024-03-22 tags: - attack.discovery - attack.t1016 logsource: category: network_connection product: windows detection: selection: - DestinationHostname: - www.ip.cn - l2.io - DestinationHostname|contains: - api.2ip.ua - api.bigdatacloud.net - api.ipify.org - bot.whatismyipaddress.com - canireachthe.net - checkip.amazonaws.com - checkip.dyndns.org - curlmyip.com - db-ip.com - edns.ip-api.com - eth0.me - freegeoip.app - geoipy.com - getip.pro - icanhazip.com - ident.me - ifconfig.io - ifconfig.me - ip-api.com - ip.360.cn - ip.anysrc.net - ip.taobao.com - ip.tyk.nu - ipaddressworld.com - ipapi.co - ipconfig.io - ipecho.net - ipinfo.io - ipip.net - ipof.in - ipv4.icanhazip.com - ipv4bot.whatismyipaddress.com - ipv6-test.com - ipwho.is - jsonip.com - myexternalip.com - seeip.org - wgetip.com - whatismyip.akamai.com - whois.pconline.com.cn - wtfismyip.com filter_optional_brave: Image|endswith: \brave.exe filter_optional_chrome: Image: - C:\Program Files\Google\Chrome\Application\chrome.exe - C:\Program Files (x86)\Google\Chrome\Application\chrome.exe filter_optional_firefox: Image: - C:\Program Files\Mozilla Firefox\firefox.exe - C:\Program Files (x86)\Mozilla Firefox\firefox.exe filter_optional_ie: Image: - C:\Program Files (x86)\Internet Explorer\iexplore.exe - C:\Program Files\Internet Explorer\iexplore.exe filter_optional_maxthon: Image|endswith: \maxthon.exe filter_optional_edge_1: - Image|startswith: C:\Program Files (x86)\Microsoft\EdgeWebView\Application\ - Image|endswith: \WindowsApps\MicrosoftEdge.exe - Image: - C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe - C:\Program Files\Mi
Near-miss passage: Sigma rule: Detects the creation of a scheduled task using schtasks.exe, potentially in combination with curl for downloading payloa. Logsource: windows / process_creation. Rule: title: Scheduled Task Creation with Curl and PowerShell Execution Combo id: 1d174d38-8fda-4081-a9b6-56d9763c0cd8 status: experimental description: 'Detects the creation of a scheduled task using schtasks.exe, potentially in combination with curl for downloading payloads and PowerShell for executing them. This facilitates executing malicious payloads or connecting with C&C server persistently without dropping the malware sample on the host. ' references: - https://tria.ge/241015-l98snsyeje/behavioral2 author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-02-05 tags: - attack.privilege-escalation - attack.execution - attack.persistence - attack.stealth - attack.t1053.005 - attack.t1218 - attack.command-and-control - attack.t1105 logsource: category: process_creation product: windows detection: selection_img: Image|endswith: \schtasks.exe CommandLine|contains|windash: ' /create ' selection_curl: CommandLine|contains|all: - 'curl ' - http - -o selection_powershell: CommandLine|contains: powershell condition: all of selection_* falsepositives: - Legitimate use of schtasks for administrative purposes. - Automation scripts combining curl and PowerShell in controlled environments. level: medium