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	1.0.6
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"
| extend AccountName = tostring(split(ActorUsername, @'\')[1]), AccountNTDomain = tostring(split(ActorUsername, @'\')[0])

YAML

triggerThreshold: 0
relevantTechniques:
- T1485
- T1036
query: |
  imProcess
  | where CommandLine has_all ("accepteula", "-s", "-r", "-q")
  | where Process !endswith "sdelete.exe"
  | where CommandLine !has "sdelete"
  | extend AccountName = tostring(split(ActorUsername, @'\')[1]), AccountNTDomain = tostring(split(ActorUsername, @'\')[0])  
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: ActorUsername
  - identifier: Name
    columnName: AccountName
  - identifier: NTDomain
    columnName: AccountNTDomain
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: Dvc
  - identifier: HostName
    columnName: DvcHostname
  - identifier: DnsDomain
    columnName: DvcDomain
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: DvcIpAddr
name: Potential re-named sdelete usage (ASIM Version)
version: 1.0.6
severity: Low
requiredDataConnectors: []
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'  
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimProcess/Potentialre-namedsdeleteusage(ASIMVersion).yaml
metadata:
  author:
    name: Microsoft Security Research
  support:
    tier: Community
  source:
    kind: Community
  categories:
    domains:
    - Security - Threat Protection
queryFrequency: 1h
tactics:
- DefenseEvasion
- Impact
kind: Scheduled
id: 5b6ae038-f66e-4f74-9315-df52fd492be4

ARM