Query: detection rule: Detects an executable initiating a network connection to "ngrok" domains. Attackers were seen using this "ngrok" in orde
Matching passage: Sigma rule: Detects an executable initiating a network connection to "ngrok" domains. Attackers were seen using this "ngrok" in orde. Logsource: windows / network_connection. Rule: title: Process Initiated Network Connection To Ngrok Domain id: 18249279-932f-45e2-b37a-8925f2597670 related: - id: 1d08ac94-400d-4469-a82f-daee9a908849 type: similar status: test description: 'Detects an executable initiating a network connection to "ngrok" domains. Attackers were seen using this "ngrok" in order to store their second stage payloads and malware. While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download. ' references: - https://ngrok.com/ - https://ngrok.com/blog-post/new-ngrok-domains - https://www.virustotal.com/gui/file/cca0c1182ac114b44dc52dd2058fcd38611c20bb6b5ad84710681d38212f835a/ - https://www.rnbo.gov.ua/files/2023_YEAR/CYBERCENTER/november/APT29%20attacks%20Embassies%20using%20CVE-2023-38831%20-%20report%20en.pdf author: Florian Roth (Nextron Systems) date: 2022-07-16 modified: 2025-07-30 tags: - attack.exfiltration - attack.command-and-control - attack.t1567 - attack.t1572 - attack.t1102 logsource: category: network_connection product: windows detection: selection: Initiated: 'true' DestinationHostname|endswith: - .ngrok-free.app - .ngrok-free.dev - .ngrok.app - .ngrok.dev - .ngrok.io condition: selection falsepositives: - Legitimate use of the ngrok service. level: high
Near-miss passage: Sigma rule: Detects the expansion or decompression of cabinet files from potentially suspicious or uncommon locations, e.g. seen in. Logsource: windows / process_creation. Rule: title: Potentially Suspicious Cabinet File Expansion id: 9f107a84-532c-41af-b005-8d12a607639f status: test description: Detects the expansion or decompression of cabinet files from potentially suspicious or uncommon locations, e.g. seen in Iranian MeteorExpress related attacks references: - https://labs.sentinelone.com/meteorexpress-mysterious-wiper-paralyzes-iranian-trains-with-epic-troll - https://blog.malwarebytes.com/threat-intelligence/2021/08/new-variant-of-konni-malware-used-in-campaign-targetting-russia/ author: Bhabesh Raj, X__Junior (Nextron Systems) date: 2021-07-30 modified: 2024-11-13 tags: - attack.stealth - attack.t1218 logsource: category: process_creation product: windows detection: selection_cmd: Image|endswith: \expand.exe CommandLine|contains|windash: '-F:' selection_folders_1: CommandLine|contains: - :\Perflogs\ - :\ProgramData - :\Users\Public\ - :\Windows\Temp\ - \Admin$\ - \AppData\Local\Temp\ - \AppData\Roaming\ - \C$\ - \Temporary Internet selection_folders_2: - CommandLine|contains|all: - :\Users\ - \Favorites\ - CommandLine|contains|all: - :\Users\ - \Favourites\ - CommandLine|contains|all: - :\Users\ - \Contacts\ filter_optional_dell: ParentImage: C:\Program Files (x86)\Dell\UpdateService\ServiceShell.exe CommandLine|contains: C:\ProgramData\Dell\UpdateService\Temp\ condition: selection_cmd and 1 of selection_folders_* and not 1 of filter_optional_* falsepositives: - System administrator Usage level: medium