Potential re-named sdelete usage (ASIM Version)

Back


Id	5b6ae038-f66e-4f74-9315-df52fd492be4
Rulename	Potential re-named sdelete usage (ASIM Version)
Description	This detection looks for command line parameters associated with the use of Sysinternals sdelete (https://docs.microsoft.com/sysinternals/downloads/sdelete) to delete multiple files on a host’s C drive. A threat actor may re-name the tool to avoid detection and then use it for destructive attacks on a host. This detection uses the ASIM imProcess parser, this will need to be deployed before use - https://docs.microsoft.com/azure/sentinel/normalization
Severity	Low
Tactics	DefenseEvasion Impact
Techniques	T1485 T1036
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/Potentialre-namedsdeleteusage(ASIMVersion).yaml
Version	1.0.4
Arm template	5b6ae038-f66e-4f74-9315-df52fd492be4.json

KQL

imProcess
  | where CommandLine has_all ("accepteula", "-s", "-r", "-q")
  | where Process !endswith "sdelete.exe"
  | where CommandLine !has "sdelete"

YAML

metadata:
  categories:
    domains:
    - Security - Threat Protection
  source:
    kind: Community
  support:
    tier: Community
  author:
    name: Pete Bryan
version: 1.0.4
name: Potential re-named sdelete usage (ASIM Version)
severity: Low
queryFrequency: 1h
kind: Scheduled
queryPeriod: 1h
description: |
  'This detection looks for command line parameters associated with the use of Sysinternals sdelete (https://docs.microsoft.com/sysinternals/downloads/sdelete) to delete multiple files on a host's C drive.
  A threat actor may re-name the tool to avoid detection and then use it for destructive attacks on a host.
  This detection uses the ASIM imProcess parser, this will need to be deployed before use - https://docs.microsoft.com/azure/sentinel/normalization'  
query: |
  imProcess
    | where CommandLine has_all ("accepteula", "-s", "-r", "-q")
    | where Process !endswith "sdelete.exe"
    | where CommandLine !has "sdelete"  
tactics:
- DefenseEvasion
- Impact
triggerOperator: gt
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DvcHostname
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: DvcIpAddr
    identifier: Address
- entityType: Account
  fieldMappings:
  - columnName: ActorUsername
    identifier: FullName
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/Potentialre-namedsdeleteusage(ASIMVersion).yaml
requiredDataConnectors: []
relevantTechniques:
- T1485
- T1036
id: 5b6ae038-f66e-4f74-9315-df52fd492be4

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/5b6ae038-f66e-4f74-9315-df52fd492be4')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/5b6ae038-f66e-4f74-9315-df52fd492be4')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Potential re-named sdelete usage (ASIM Version)",
        "description": "'This detection looks for command line parameters associated with the use of Sysinternals sdelete (https://docs.microsoft.com/sysinternals/downloads/sdelete) to delete multiple files on a host's C drive.\nA threat actor may re-name the tool to avoid detection and then use it for destructive attacks on a host.\nThis detection uses the ASIM imProcess parser, this will need to be deployed before use - https://docs.microsoft.com/azure/sentinel/normalization'\n",
        "severity": "Low",
        "enabled": true,
        "query": "imProcess\n  | where CommandLine has_all (\"accepteula\", \"-s\", \"-r\", \"-q\")\n  | where Process !endswith \"sdelete.exe\"\n  | where CommandLine !has \"sdelete\"\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Impact"
        ],
        "techniques": [
          "T1485",
          "T1036"
        ],
        "alertRuleTemplateName": "5b6ae038-f66e-4f74-9315-df52fd492be4",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "DvcHostname",
                "identifier": "FullName"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "columnName": "DvcIpAddr",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "columnName": "ActorUsername",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/Potentialre-namedsdeleteusage(ASIMVersion).yaml",
        "templateVersion": "1.0.4"
      }
    }
  ]
}