Hub configuration

Name: Suspicious Obfuscated PowerShell Code
Author: sigmahq

More info

1type: trigger

2name: sigmahq/proc_creation_win_powershell_base64_encoded_obfusc

3description: |

4 Detects suspicious UTF16 and base64 encoded and often obfuscated PowerShell code often used in command lines

5filter: |

6 (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine contains 'IAAtAGIAeABvAHIAIAAwAHgA' || evt.Parsed.CommandLine contains 'AALQBiAHgAbwByACAAMAB4A' || evt.Parsed.CommandLine contains 'gAC0AYgB4AG8AcgAgADAAeA' || evt.Parsed.CommandLine contains 'AC4ASQBuAHYAbwBrAGUAKAApACAAfAAg' || evt.Parsed.CommandLine contains 'AuAEkAbgB2AG8AawBlACgAKQAgAHwAI' || evt.Parsed.CommandLine contains 'ALgBJAG4AdgBvAGsAZQAoACkAIAB8AC' || evt.Parsed.CommandLine contains 'AHsAMQB9AHsAMAB9ACIAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADEAfQB7ADAAfQAiACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAxAH0AewAwAH0AIgAgAC0AZgAg' || evt.Parsed.CommandLine contains 'AHsAMAB9AHsAMwB9ACIAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADAAfQB7ADMAfQAiACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAwAH0AewAzAH0AIgAgAC0AZgAg' || evt.Parsed.CommandLine contains 'AHsAMgB9AHsAMAB9ACIAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADIAfQB7ADAAfQAiACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAyAH0AewAwAH0AIgAgAC0AZgAg' || evt.Parsed.CommandLine contains 'AHsAMQB9AHsAMAB9ACcAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADEAfQB7ADAAfQAnACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAxAH0AewAwAH0AJwAgAC0AZgAg' || evt.Parsed.CommandLine contains 'AHsAMAB9AHsAMwB9ACcAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADAAfQB7ADMAfQAnACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAwAH0AewAzAH0AJwAgAC0AZgAg' || evt.Parsed.CommandLine contains 'AHsAMgB9AHsAMAB9ACcAIAAtAGYAI' || evt.Parsed.CommandLine contains 'B7ADIAfQB7ADAAfQAnACAALQBmAC' || evt.Parsed.CommandLine contains 'AewAyAH0AewAwAH0AJwAgAC0AZgAg')

7blackhole: 2m

8#status: test

9labels:

10 service: windows

11 confidence: 1

12 spoofable: 0

13 classification:

15 label: "Suspicious Obfuscated PowerShell Code"

16 behavior : "windows:audit"

17 remediation: false

19scope:

20 type: ParentProcessId

21 expression: evt.Parsed.ParentProcessId

Hub configuration

« Suspicious Obfuscated PowerShell Code »v0.2 by sigmahq / proc_creation_win_powershell_base64_encoded_obfuscAttack scenariowindowsNot spoofableLow confidence

« Suspicious Obfuscated PowerShell Code »
v0.2 by sigmahq / proc_creation_win_powershell_base64_encoded_obfusc
Attack scenariowindowsNot spoofableLow confidence