Shadow Copies Deletion Using Operating Systems Utilities

{
  "process_creation": {
    "EventID": 1,
    "Channel": "Microsoft-Windows-Sysmon/Operational"
  },
  "selection1_img": [
    {
      "Image
| endswith": [
        "\\powershell.exe",
        "\\pwsh.exe",
        "\\wmic.exe",
        "\\vssadmin.exe",
        "\\diskshadow.exe"
      ]
    },
    {
      "OriginalFileName": [
        "PowerShell.EXE",
        "pwsh.dll",
        "wmic.exe",
        "VSSADMIN.EXE",
        "diskshadow.exe"
      ]
    }
  ],
  "selection1_cli": {
    "CommandLine
| contains
| all": [
      "shadow",
      "delete"
    ]
  },
  "selection2_img": [
    {
      "Image
| endswith": "\\wbadmin.exe"
    },
    {
      "OriginalFileName": "WBADMIN.EXE"
    }
  ],
  "selection2_cli": {
    "CommandLine
| contains
| all": [
      "delete",
      "catalog",
      "quiet"
    ]
  },
  "selection3_img": [
    {
      "Image
| endswith": "\\vssadmin.exe"
    },
    {
      "OriginalFileName": "VSSADMIN.EXE"
    }
  ],
  "selection3_cli": {
    "CommandLine
| contains
| all": [
      "resize",
      "shadowstorage"
    ],
    "CommandLine
| contains": [
      "unbounded",
      "/MaxSize="
    ]
  },
  "condition": "process_creation and ((all of selection1*) or (all of selection2*) or (all of selection3*))"
}

False Positives

• ⚠ Legitimate Administrator deletes Shadow Copies using operating systems utilities for legitimate reason
• ⚠ LANDesk LDClient Ivanti-PSModule (PS EncodedCommand)