Detection rules › Sigma
Account set with reversible encryption (weakness introduction)
Detects scenarios where an attacker set an account with reversible encryption to facilitate brutforce or cracking operations.
Known false positives
- None
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Security-Auditing | Event ID 4738: A user account was changed. |
Rule body
title: Account set with reversible encryption (weakness introduction)
description: Detects scenarios where an attacker set an account with reversible encryption to facilitate brutforce or cracking operations.
references:
- https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0003-Persistence/T1098.xxx-Account%20manipulation
- https://www.blackhillsinfosec.com/how-i-cracked-a-128-bit-password/
tags:
- attack.persistence
- attack.t1098
author: mdecrevoisier
status: experimental
logsource:
product: windows
service: security
detection:
selection:
EventID: 4738
UserAccountControl: '%%2091' # Store password using reversible encryption - True
condition: selection
falsepositives:
- None
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
EventID: 4738
UserAccountControl: '%%2091'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
UserAccountControl | eq |
| field:"UserAccountControl" kind:eq value:"%%2091" |