Files
hayabusa/rules/Sigma/win_powershell_cmdline_reversed_strings.yml
2021-11-14 11:00:56 +09:00

87 lines
2.6 KiB
YAML

title: Suspicious PowerShell Cmdline
author: Teymur Kheirkhabarov (idea), Vasiliy Burov (rule), oscd.community
date: 2020/10/11
description: Detects the PowerShell command lines with reversed strings
detection:
SELECTION_1:
EventID: 1
SELECTION_10:
CommandLine: '*golon*'
SELECTION_11:
CommandLine: '*tninon*'
SELECTION_12:
CommandLine: '*eddih*'
SELECTION_13:
CommandLine: '*tpircS*'
SELECTION_14:
CommandLine: '*ssecorp*'
SELECTION_15:
CommandLine: '*llehsrewop*'
SELECTION_16:
CommandLine: '*esnopser*'
SELECTION_17:
CommandLine: '*daolnwod*'
SELECTION_18:
CommandLine: '*tneilCbeW*'
SELECTION_19:
CommandLine: '*tneilc*'
SELECTION_2:
Image: '*\powershell.exe'
SELECTION_20:
CommandLine: '*ptth*'
SELECTION_21:
CommandLine: '*elifotevas*'
SELECTION_22:
CommandLine: '*46esab*'
SELECTION_23:
CommandLine: '*htaPpmeTteG*'
SELECTION_24:
CommandLine: '*tcejbO*'
SELECTION_25:
CommandLine: '*maerts*'
SELECTION_26:
CommandLine: '*hcaerof*'
SELECTION_27:
CommandLine: '*ekovni*'
SELECTION_28:
CommandLine: '*retupmoc*'
SELECTION_3:
CommandLine: '*hctac*'
SELECTION_4:
CommandLine: '*kearb*'
SELECTION_5:
CommandLine: '*dnammoc*'
SELECTION_6:
CommandLine: '*ekovn*'
SELECTION_7:
CommandLine: '*eliFd*'
SELECTION_8:
CommandLine: '*rahc*'
SELECTION_9:
CommandLine: '*etirw*'
condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10
or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14 or SELECTION_15
or SELECTION_16 or SELECTION_17 or SELECTION_18 or SELECTION_19 or SELECTION_20
or SELECTION_21 or SELECTION_22 or SELECTION_23 or SELECTION_24 or SELECTION_25
or SELECTION_26 or SELECTION_27 or SELECTION_28))
falsepositives:
- Unlikely
id: b6b49cd1-34d6-4ead-b1bf-176e9edba9a4
level: high
logsource:
category: process_creation
product: windows
references:
- https://2019.offzone.moscow/ru/report/hunting-for-powershell-abuses/
- https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=66
status: experimental
tags:
- attack.defense_evasion
- attack.t1027
- attack.execution
- attack.t1059.001
yml_filename: win_powershell_cmdline_reversed_strings.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation