Detection rules › Sigma
Win Susp Computer Name Containing Samtheadmin
Detects suspicious computer name samtheadmin-{1..100}$ generated by hacktool
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Persistence | |
| Privilege Escalation | |
| Stealth |
Rule body
title: Win Susp Computer Name Containing Samtheadmin
id: 39698b3f-da92-4bc6-bfb5-645a98386e45
status: test
description: Detects suspicious computer name samtheadmin-{1..100}$ generated by hacktool
references:
- https://twitter.com/malmoeb/status/1511760068743766026
- https://github.com/helloexp/0day/blob/614227a7b9beb0e91e7e2c6a5e532e6f7a8e883c/00-CVE_EXP/CVE-2021-42287/sam-the-admin/sam_the_admin.py
author: elhoim
date: 2022-09-09
modified: 2023-01-04
tags:
- attack.initial-access
- cve.2021-42278
- cve.2021-42287
- attack.persistence
- attack.privilege-escalation
- attack.stealth
- attack.t1078
logsource:
service: security
product: windows
detection:
# Not adding an EventID on purpose to try to match on any event in security (including use of account), not just 4741 (computer account created)
selection1:
SamAccountName|startswith: 'SAMTHEADMIN-'
SamAccountName|endswith: '$'
selection2:
TargetUserName|startswith: 'SAMTHEADMIN-'
TargetUserName|endswith: '$'
condition: 1 of selection*
falsepositives:
- Unknown
level: critical
Stages and Predicates
Stage 0: condition
1 of selection*Stage 1: selection1
selection1:
SamAccountName|startswith: 'SAMTHEADMIN-'
SamAccountName|endswith: '$'
Stage 2: selection2
selection2:
TargetUserName|startswith: 'SAMTHEADMIN-'
TargetUserName|endswith: '$'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
SamAccountName | ends_with |
| field:"SamAccountName" kind:ends_with value:"$" |
SamAccountName | starts_with |
| field:"SamAccountName" kind:starts_with value:"SAMTHEADMIN-" |
TargetUserName | ends_with |
| field:"TargetUserName" kind:ends_with value:"$" |
TargetUserName | starts_with |
| field:"TargetUserName" kind:starts_with value:"SAMTHEADMIN-" |