Windows Vista event log file
application/octet-stream
Magic Bytes
Offset: 0
45 6C 66 46 69 6C 65
The Windows XML Event Log (EVTX) is a binary file format developed and maintained by Microsoft for system logging on Windows Vista and subsequent operating systems. Administrators and forensic analysts use these records to audit system activity, troubleshoot software errors, and monitor security events through tools like Windows Event Viewer. This format replaced the legacy EVT structure, introducing a proprietary binary XML schema that improves data integrity and supports significantly larger log file sizes.
Validation Code
How to validate .evtx files in Python
Python
def is_evtx(file_path: str) -> bool:
"""Check if file is a valid EVTX by magic bytes."""
signature = bytes([0x45, 0x6C, 0x66, 0x46, 0x69, 0x6C, 0x65])
with open(file_path, "rb") as f:
return f.read(7) == signatureHow to validate .evtx files in Node.js
Node.js
function isEVTX(buffer: Buffer): boolean {
const signature = Buffer.from([0x45, 0x6C, 0x66, 0x46, 0x69, 0x6C, 0x65]);
return buffer.subarray(0, 7).equals(signature);
}
Go
func IsEVTX(data []byte) bool {
signature := []byte{0x45, 0x6C, 0x66, 0x46, 0x69, 0x6C, 0x65}
if len(data) < 7 {
return false
}
return bytes.Equal(data[:7], signature)
}API Endpoint
GET
/api/v1/evtx
curl https://filesignature.org/api/v1/evtx