Suspicious Resource deployment

Original query, unchanged.

// Add or remove operation names below as per your requirements. For operations lists, please refer to https://learn.microsoft.com/en-us/Azure/role-based-access-control/resource-provider-operations#all
let szOperationNames = dynamic(["Microsoft.Compute/virtualMachines/write", "Microsoft.Resources/deployments/write", "Microsoft.Resources/subscriptions/resourceGroups/write"]);
let starttime = 14d;
let endtime = 1d;
let RareCaller = AzureActivity
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationNameValue in~ (szOperationNames)
| summarize count() by CallerIpAddress, Caller, OperationNameValue, bin(TimeGenerated,1d)
// Returns all the records from the right side that don't have matches from the left.
| join kind=rightantisemi (
AzureActivity
| where TimeGenerated > ago(endtime)
| where OperationNameValue in~ (szOperationNames)
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityTimeStamp = make_set(TimeGenerated,100), ActivityStatusValue = make_set(ActivityStatusValue,100), CorrelationIds = make_set(CorrelationId,100), ResourceGroups = make_set(ResourceGroup,100), ResourceIds = make_set(_ResourceId,100), ActivityCountByCallerIPAddress = count()
by CallerIpAddress, Caller, OperationNameValue) on CallerIpAddress, Caller, OperationNameValue;
RareCaller
| extend Name = iif(Caller has '@',tostring(split(Caller,'@',0)[0]),"")
| extend UPNSuffix = iif(Caller has '@',tostring(split(Caller,'@',1)[0]),"")
| extend AadUserId = iif(Caller !has '@',Caller,"")