Techniques
Sample rules
Third-party Backup Files Deleted via Unexpected Process
- source: elastic
- technicques:
- T1485
- T1490
Description
Identifies the deletion of backup files, saved using third-party software, by a process outside of the backup suite. Adversaries may delete Backup files to ensure that recovery from a ransomware attack is less likely.
Detection logic
file where host.os.type == "windows" and event.type == "deletion" and
(
/* Veeam Related Backup Files */
(
file.extension : ("VBK", "VIB", "VBM") and
not (
process.executable : ("?:\\Windows\\*", "?:\\Program Files\\*", "?:\\Program Files (x86)\\*") and
(process.code_signature.trusted == true and process.code_signature.subject_name : ("Veeam Software Group GmbH", "Veeam Software AG"))
)
) or
/* Veritas Backup Exec Related Backup File */
(
file.extension : "BKF" and
not process.executable : (
"?:\\Program Files\\Veritas\\Backup Exec\\*",
"?:\\Program Files (x86)\\Veritas\\Backup Exec\\*"
)
)
) and
not (
process.name : ("MSExchangeMailboxAssistants.exe", "Microsoft.PowerBI.EnterpriseGateway.exe") and
(process.code_signature.subject_name : "Microsoft Corporation" and process.code_signature.trusted == true)
) and
not file.path : (
"?:\\ProgramData\\Trend Micro\\*",
"?:\\Program Files (x86)\\Trend Micro\\*",
"?:\\$RECYCLE.BIN\\*"
)