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Sigma detection rules

3 rules indexed · SIEM-agnostic detection content
Sigma is the open generic signature format for SIEM systems. Each rule below converts to native syntax for Splunk, Elastic, Sentinel, and other SIEMs. Expand any rule to see its raw YAML.

Detection rules

3 shown of 3
high
Use of W32tm as Timer
When configured with suitable command line arguments, w32tm can act as a delay mechanism
status test author frack113 id 6da2c9f5-7c53-401b-aacb-92c040ce1215
view Sigma YAML
title: Use of W32tm as Timer
id: 6da2c9f5-7c53-401b-aacb-92c040ce1215
status: test
description: When configured with suitable command line arguments, w32tm can act as a delay mechanism
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/d0dad62dbcae9c60c519368e82c196a3db577055/atomics/T1124/T1124.md
    - https://blogs.blackberry.com/en/2022/05/dirty-deeds-done-dirt-cheap-russian-rat-offers-backdoor-bargains
author: frack113
date: 2022-09-25
tags:
    - attack.discovery
    - attack.t1124
logsource:
    category: process_creation
    product: windows
detection:
    selection_w32tm:
        - Image|endswith: '\w32tm.exe'
        - OriginalFileName: 'w32time.dll'
    selection_cmd:
        CommandLine|contains|all:
            - '/stripchart'
            - '/computer:'
            - '/period:'
            - '/dataonly'
            - '/samples:'
    condition: all of selection_*
falsepositives:
    - Legitimate use
level: high
low
Cisco Discovery
Find information about network devices that is not stored in config files
status test author Austin Clark id 9705a6a1-6db6-4a16-a987-15b7151e299b
view Sigma YAML
title: Cisco Discovery
id: 9705a6a1-6db6-4a16-a987-15b7151e299b
status: test
description: Find information about network devices that is not stored in config files
references:
    - https://www.cisco.com/c/en/us/td/docs/server_nw_virtual/2-5_release/command_reference/show.html
author: Austin Clark
date: 2019-08-12
modified: 2023-01-04
tags:
    - attack.discovery
    - attack.t1083
    - attack.t1201
    - attack.t1057
    - attack.t1018
    - attack.t1082
    - attack.t1016
    - attack.t1049
    - attack.t1033
    - attack.t1124
logsource:
    product: cisco
    service: aaa
detection:
    keywords:
        - 'dir'
        - 'show arp'
        - 'show cdp'
        - 'show clock'
        - 'show ip interface'
        - 'show ip route'
        - 'show ip sockets'
        - 'show processes'
        - 'show ssh'
        - 'show users'
        - 'show version'
    condition: keywords
falsepositives:
    - Commonly used by administrators for troubleshooting
level: low
low
Discovery of a System Time
Identifies use of various commands to query a systems time. This technique may be used before executing a scheduled task or to discover the time zone of a target system.
status test author E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community id b243b280-65fe-48df-ba07-6ddea7646427
view Sigma YAML
title: Discovery of a System Time
id: b243b280-65fe-48df-ba07-6ddea7646427
status: test
description: Identifies use of various commands to query a systems time. This technique may be used before executing a scheduled task or to discover the time zone of a target system.
references:
    - https://eqllib.readthedocs.io/en/latest/analytics/fcdb99c2-ac3c-4bde-b664-4b336329bed2.html
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1124/T1124.md
author: E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community
date: 2019-10-24
modified: 2022-06-28
tags:
    - attack.discovery
    - attack.t1124
logsource:
    category: process_creation
    product: windows
detection:
    selection_time:
        Image|endswith:
            - '\net.exe'
            - '\net1.exe'
        CommandLine|contains: 'time'
    selection_w32tm:
        Image|endswith: '\w32tm.exe'
        CommandLine|contains: 'tz'
    condition: 1 of selection_*
falsepositives:
    - Legitimate use of the system utilities to discover system time for legitimate reason
level: low
Showing 1-3 of 3
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