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.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1098 Account Manipulation |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4738 | A user account was changed. |
Rule body yaml
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
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
UserAccountControl | eq |
|