Query: detect Detects connections from routable IPs to an RDP listener. Which is indicative of a publicly-accessible RDP service. in logs
Matching passage: Sigma rule: Detects connections from routable IPs to an RDP listener. Which is indicative of a publicly-accessible RDP service.. Logsource: zeek / rdp. Rule: title: Publicly Accessible RDP Service id: 1fc0809e-06bf-4de3-ad52-25e5263b7623 status: test description: 'Detects connections from routable IPs to an RDP listener. Which is indicative of a publicly-accessible RDP service. ' author: Josh Brower @DefensiveDepth date: 2020-08-22 modified: 2024-03-13 tags: - attack.lateral-movement - attack.t1021.001 logsource: product: zeek service: rdp detection: selection: id.orig_h|cidr: - ::1/128 - 10.0.0.0/8 - 127.0.0.0/8 - 172.16.0.0/12 - 192.168.0.0/16 - 169.254.0.0/16 - 2620:83:8000::/48 - fc00::/7 - fe80::/10 condition: not selection falsepositives: - Although it is recommended to NOT have RDP exposed to the internet, verify that this is a) allowed b) the server has not already been compromised via some brute force or remote exploit since it has been exposed to the internet. Work to secure the server if you are unable to remove it from being exposed to the internet. level: high
Near-miss passage: Sigma rule: Detects a DNS query by a non browser process on the system to "azurewebsites.net". The latter was often used by threat a. Logsource: windows / dns_query. Rule: title: DNS Query To AzureWebsites.NET By Non-Browser Process id: e043f529-8514-4205-8ab0-7f7d2927b400 related: - id: 5c80b618-0dbb-46e6-acbb-03d90bcb6d83 type: derived status: test description: 'Detects a DNS query by a non browser process on the system to "azurewebsites.net". The latter was often used by threat actors as a malware hosting and exfiltration site. ' references: - https://www.sentinelone.com/labs/wip26-espionage-threat-actors-abuse-cloud-infrastructure-in-targeted-telco-attacks/ - https://symantec-enterprise-blogs.security.com/threat-intelligence/harvester-new-apt-attacks-asia - https://www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/higaisa-or-winnti-apt-41-backdoors-old-and-new/ - https://intezer.com/blog/research/how-we-escaped-docker-in-azure-functions/ author: Nasreddine Bencherchali (Nextron Systems) date: 2024-06-24 tags: - attack.command-and-control - attack.t1219.002 logsource: product: windows category: dns_query detection: selection: QueryName|endswith: azurewebsites.net 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_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\Microsoft\Edge\Application\msedge.exe filter_optional_edge_2: Image|startswith: - C:\Program Files (x86)\Microsoft\EdgeCore\ - C:\Program Files\Microsoft\EdgeCore\ Image|endswith: - \msedge.exe - \msedgewebview2.exe filter_optional_safari: Image|endswith: \safari.exe filter_optional_defender: Image|endswith: - \MsMpEng.exe - \MsSense.exe filter_optional_brave: Image|endswith: \brave.exe Image|startswith: C:\Program Files\BraveSoftware\ filter_optional_maxthon: Image|contains: \AppData\Local\Maxthon\ Image|endswith: \maxthon.exe filter_optional_opera: Image|contains: \AppData\Local\Programs\Opera\ Image|endswith: \opera.exe filter_optional_seamonkey: Image|startswith: - C:\Program Files\SeaMonkey\ - C:\Program Files (x86)\SeaMonkey\ Image|endswith: \seamonkey.exe filter_optional_vivaldi: Image|contains: \AppD