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Detection rules › Sigma

Potentially Suspicious Child Process Of ClickOnce Application

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects potentially suspicious child processes of a ClickOnce deployment application

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation
Security-Auditing4688A new process has been created.

Stages and Predicates

Stage 1: selection

or:
Image|endswith: '\calc.exe'
Image|endswith: '\cmd.exe'
Image|endswith: '\cscript.exe'
Image|endswith: '\explorer.exe'
Image|endswith: '\mshta.exe'
Image|endswith: '\net.exe'
Image|endswith: '\net1.exe'
Image|endswith: '\nltest.exe'
Image|endswith: '\notepad.exe'
Image|endswith: '\powershell.exe'
Image|endswith: '\pwsh.exe'
Image|endswith: '\reg.exe'
Image|endswith: '\regsvr32.exe'
Image|endswith: '\rundll32.exe'
Image|endswith: '\schtasks.exe'
Image|endswith: '\werfault.exe'
Image|endswith: '\wscript.exe'
ParentImage|contains: '\AppData\Local\Apps\2.0\'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Imageends_with
  • \calc.exe corpus 13 (sigma 13)
  • \cmd.exe corpus 92 (sigma 92)
  • \cscript.exe corpus 64 (sigma 64)
  • \explorer.exe corpus 12 (sigma 12)
  • \mshta.exe corpus 57 (sigma 57)
  • \net.exe corpus 27 (sigma 27)
  • \net1.exe corpus 25 (sigma 25)
  • \nltest.exe corpus 9 (sigma 9)
  • \notepad.exe corpus 11 (sigma 11)
  • \powershell.exe corpus 143 (sigma 143)
  • \pwsh.exe corpus 140 (sigma 140)
  • \reg.exe corpus 46 (sigma 46)
  • \regsvr32.exe corpus 57 (sigma 57)
  • \rundll32.exe corpus 76 (sigma 76)
  • \schtasks.exe corpus 45 (sigma 45)
  • \werfault.exe corpus 4 (sigma 4)
  • \wscript.exe corpus 64 (sigma 64)
ParentImagematch
  • \AppData\Local\Apps\2.0\