Detectionmediumtest
ConvertTo-SecureString Cmdlet Usage Via CommandLine
Detects usage of the "ConvertTo-SecureString" cmdlet via the commandline. Which is fairly uncommon and could indicate potential suspicious activity
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Launch
Teymur Kheirkhabarov, Vasiliy Burov, oscd.community, Tim SheltonCreated Sun Oct 11Updated Wed Feb 0174403157-20f5-415d-89a7-c505779585cfwindows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic2 selectors
detection:
selection_img:
- Image|endswith:
- '\powershell.exe'
- '\pwsh.exe'
- OriginalFileName:
- 'PowerShell.EXE'
- 'pwsh.dll'
selection_cli:
CommandLine|contains: 'ConvertTo-SecureString'
condition: all of selection_*False Positives
Legitimate use to pass password to different powershell commands
MITRE ATT&CK
Techniques
Sub-techniques
Rule Metadata
Rule ID
74403157-20f5-415d-89a7-c505779585cf
Status
test
Level
medium
Type
Detection
Created
Sun Oct 11
Modified
Wed Feb 01
Path
rules/windows/process_creation/proc_creation_win_powershell_cmdline_convertto_securestring.yml
Raw Tags
attack.defense-evasionattack.t1027attack.executionattack.t1059.001