Query: write Sigma for Detects the addition of a new module to an IIS server.
Matching passage: Sigma rule: Detects the addition of a new module to an IIS server.. Logsource: windows / iis-configuration. Rule: title: New Module Module Added To IIS Server id: dd857d3e-0c6e-457b-9b48-e82ae7f86bd7 status: test description: Detects the addition of a new module to an IIS server. references: - https://learn.microsoft.com/en-us/iis/manage/provisioning-and-managing-iis/configure-logging-in-iis - https://www.microsoft.com/en-us/security/blog/2022/12/12/iis-modules-the-evolution-of-web-shells-and-how-to-detect-them/ - https://www.microsoft.com/en-us/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/ - https://learn.microsoft.com/en-us/iis/get-started/introduction-to-iis/iis-modules-overview author: frack113 date: 2024-10-06 tags: - attack.persistence - attack.defense-impairment - attack.t1685.001 - attack.t1505.004 logsource: product: windows service: iis-configuration detection: selection: EventID: 29 Configuration|contains: /system.webServer/modules/add filter_main_builtin: NewValue: - AnonymousAuthenticationModule - CustomErrorModule - DefaultDocumentModule - DirectoryListingModule - FileCacheModule - HttpCacheModule - HttpLoggingModule - ProtocolSupportModule - RequestFilteringModule - StaticCompressionModule - StaticFileModule - TokenCacheModule - UriCacheModule filter_main_remove: NewValue: '' condition: selection and not 1 of filter_main_* falsepositives: - Legitimate administrator activity level: medium
Near-miss passage: Sigma rule: Detects usage of the windows RPC library Encrypting File System Remote Protocol (MS-EFSRPC). Variations of this RPC are. Logsource: zeek / dce_rpc. Rule: title: Potential PetitPotam Attack Via EFS RPC Calls id: 4096842a-8f9f-4d36-92b4-d0b2a62f9b2a status: test description: "Detects usage of the windows RPC library Encrypting File System Remote Protocol (MS-EFSRPC). Variations of this\ \ RPC are used within the attack refereed to as PetitPotam.\nThe usage of this RPC function should be rare if ever used\ \ at all.\nThus usage of this function is uncommon enough that any usage of this RPC function should warrant further investigation\ \ to determine if it is legitimate.\n View surrounding logs (within a few minutes before and after) from the Source IP to.\ \ Logs from from the Source IP would include dce_rpc, smb_mapping, smb_files, rdp, ntlm, kerberos, etc..'\n" references: - https://github.com/topotam/PetitPotam/blob/d83ac8f2dd34654628c17490f99106eb128e7d1e/PetitPotam/PetitPotam.cpp - https://msrc.microsoft.com/update-guide/vulnerability/ADV210003 - https://vx-underground.org/archive/Symantec/windows-vista-network-attack-07-en.pdf - https://threatpost.com/microsoft-petitpotam-poc/168163/ author: '@neu5ron, @Antonlovesdnb, Mike Remen' date: 2021-08-17 modified: 2022-11-28 tags: - attack.collection - attack.credential-access - attack.t1557.001 - attack.t1187 logsource: product: zeek service: dce_rpc detection: selection: operation|startswith: efs condition: selection falsepositives: - Uncommon but legitimate windows administrator or software tasks that make use of the Encrypting File System RPC Calls. Verify if this is common activity (see description). level: medium