sigmahighHunting

Suspicious Obfuscated PowerShell Code

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

Detection Query

selection:
  CommandLine|contains:
    - IAAtAGIAeABvAHIAIAAwAHgA
    - AALQBiAHgAbwByACAAMAB4A
    - gAC0AYgB4AG8AcgAgADAAeA
    - AC4ASQBuAHYAbwBrAGUAKAApACAAfAAg
    - AuAEkAbgB2AG8AawBlACgAKQAgAHwAI
    - ALgBJAG4AdgBvAGsAZQAoACkAIAB8AC
    - AHsAMQB9AHsAMAB9ACIAIAAtAGYAI
    - B7ADEAfQB7ADAAfQAiACAALQBmAC
    - AewAxAH0AewAwAH0AIgAgAC0AZgAg
    - AHsAMAB9AHsAMwB9ACIAIAAtAGYAI
    - B7ADAAfQB7ADMAfQAiACAALQBmAC
    - AewAwAH0AewAzAH0AIgAgAC0AZgAg
    - AHsAMgB9AHsAMAB9ACIAIAAtAGYAI
    - B7ADIAfQB7ADAAfQAiACAALQBmAC
    - AewAyAH0AewAwAH0AIgAgAC0AZgAg
    - AHsAMQB9AHsAMAB9ACcAIAAtAGYAI
    - B7ADEAfQB7ADAAfQAnACAALQBmAC
    - AewAxAH0AewAwAH0AJwAgAC0AZgAg
    - AHsAMAB9AHsAMwB9ACcAIAAtAGYAI
    - B7ADAAfQB7ADMAfQAnACAALQBmAC
    - AewAwAH0AewAzAH0AJwAgAC0AZgAg
    - AHsAMgB9AHsAMAB9ACcAIAAtAGYAI
    - B7ADIAfQB7ADAAfQAnACAALQBmAC
    - AewAyAH0AewAwAH0AJwAgAC0AZgAg
condition: selection

Author

Florian Roth (Nextron Systems)

Created

2022-07-11

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://app.any.run/tasks/fcadca91-3580-4ede-aff4-4d2bf809bf99/

Tags

attack.defense-evasion

Raw Content

title: Suspicious Obfuscated PowerShell Code
id: 8d01b53f-456f-48ee-90f6-bc28e67d4e35
status: test
description: Detects suspicious UTF16 and base64 encoded and often obfuscated PowerShell code often used in command lines
references:
    - https://app.any.run/tasks/fcadca91-3580-4ede-aff4-4d2bf809bf99/
author: Florian Roth (Nextron Systems)
date: 2022-07-11
modified: 2023-02-14
tags:
    - attack.defense-evasion
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains:
            #  -bxor 0x
            - 'IAAtAGIAeABvAHIAIAAwAHgA'
            - 'AALQBiAHgAbwByACAAMAB4A'
            - 'gAC0AYgB4AG8AcgAgADAAeA'
            # .Invoke() |
            - 'AC4ASQBuAHYAbwBrAGUAKAApACAAfAAg'
            - 'AuAEkAbgB2AG8AawBlACgAKQAgAHwAI'
            - 'ALgBJAG4AdgBvAGsAZQAoACkAIAB8AC'
            # {1}{0}" -f
            # {0}{3}" -f
            # {2}{0}" -f
            - 'AHsAMQB9AHsAMAB9ACIAIAAtAGYAI'
            - 'B7ADEAfQB7ADAAfQAiACAALQBmAC'
            - 'AewAxAH0AewAwAH0AIgAgAC0AZgAg'
            - 'AHsAMAB9AHsAMwB9ACIAIAAtAGYAI'
            - 'B7ADAAfQB7ADMAfQAiACAALQBmAC'
            - 'AewAwAH0AewAzAH0AIgAgAC0AZgAg'
            - 'AHsAMgB9AHsAMAB9ACIAIAAtAGYAI'
            - 'B7ADIAfQB7ADAAfQAiACAALQBmAC'
            - 'AewAyAH0AewAwAH0AIgAgAC0AZgAg'
            # {1}{0}' -f
            # {0}{3}' -f
            # {2}{0}' -f
            - 'AHsAMQB9AHsAMAB9ACcAIAAtAGYAI'
            - 'B7ADEAfQB7ADAAfQAnACAALQBmAC'
            - 'AewAxAH0AewAwAH0AJwAgAC0AZgAg'
            - 'AHsAMAB9AHsAMwB9ACcAIAAtAGYAI'
            - 'B7ADAAfQB7ADMAfQAnACAALQBmAC'
            - 'AewAwAH0AewAzAH0AJwAgAC0AZgAg'
            - 'AHsAMgB9AHsAMAB9ACcAIAAtAGYAI'
            - 'B7ADIAfQB7ADAAfQAnACAALQBmAC'
            - 'AewAyAH0AewAwAH0AJwAgAC0AZgAg'
    condition: selection
falsepositives:
    - Unknown
level: high