Query: detection rule: Identifies when a Virtual Network is modified or deleted in Azure.
Matching passage: Sigma rule: Identifies when a Virtual Network is modified or deleted in Azure.. Logsource: azure / activitylogs. Rule: title: Azure Virtual Network Modified or Deleted id: bcfcc962-0e4a-4fd9-84bb-a833e672df3f status: test description: Identifies when a Virtual Network is modified or deleted in Azure. references: - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations author: Austin Songer @austinsonger date: 2021-08-08 modified: 2022-08-23 tags: - attack.impact logsource: product: azure service: activitylogs detection: selection: operationName|startswith: - MICROSOFT.NETWORK/VIRTUALNETWORKGATEWAYS/ - MICROSOFT.NETWORK/VIRTUALNETWORKS/ operationName|endswith: - /WRITE - /DELETE condition: selection falsepositives: - Virtual Network being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. - Virtual Network modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule. level: medium
Near-miss passage: Sigma rule: Detects the creation of an "Active Directory Schema Cache File" (.sch) file by an uncommon tool.. Logsource: windows / file_event. Rule: title: ADSI-Cache File Creation By Uncommon Tool id: 75bf09fa-1dd7-4d18-9af9-dd9e492562eb status: test description: Detects the creation of an "Active Directory Schema Cache File" (.sch) file by an uncommon tool. references: - https://medium.com/@ivecodoe/detecting-ldapfragger-a-newly-released-cobalt-strike-beacon-using-ldap-for-c2-communication-c274a7f00961 - https://blog.fox-it.com/2020/03/19/ldapfragger-command-and-control-over-ldap-attributes/ - https://github.com/fox-it/LDAPFragger author: xknow @xknow_infosec, Tim Shelton date: 2019-03-24 modified: 2023-10-18 tags: - attack.t1001.003 - attack.command-and-control logsource: product: windows category: file_event detection: selection: TargetFilename|contains: \Local\Microsoft\Windows\SchCache\ TargetFilename|endswith: .sch filter_main_generic: - Image|endswith: - :\Program Files\Cylance\Desktop\CylanceSvc.exe - :\Windows\CCM\CcmExec.exe - :\windows\system32\dllhost.exe - :\Windows\system32\dsac.exe - :\Windows\system32\efsui.exe - :\windows\system32\mmc.exe - :\windows\system32\svchost.exe - :\Windows\System32\wbem\WmiPrvSE.exe - :\windows\system32\WindowsPowerShell\v1.0\powershell.exe - Image|contains: - :\Windows\ccmsetup\autoupgrade\ccmsetup - :\Program Files\SentinelOne\Sentinel Agent filter_main_office: Image|contains|all: - :\Program Files\ - \Microsoft Office Image|endswith: \OUTLOOK.EXE filter_optional_ldapwhoami: Image|endswith: \LANDesk\LDCLient\ldapwhoami.exe filter_optional_citrix: Image|endswith: :\Program Files\Citrix\Receiver StoreFront\Services\DefaultDomainServices\Citrix.DeliveryServices.DomainServices.ServiceHost.exe condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Other legimate tools, which do ADSI (LDAP) operations, e.g. any remoting activity by MMC, Powershell, Windows etc. level: medium