Potential COM Objects Download Cradles Usage - PS Script

calendar Nov 2, 2023 · attack.command_and_control attack.t1105  ·
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Detects usage of COM objects that can be abused to download files in PowerShell by CLSID

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 1title: Potential COM Objects Download Cradles Usage - PS Script
 2id: 3c7d1587-3b13-439f-9941-7d14313dbdfe
 3related:
 4    - id: 02b64f1b-3f33-4e67-aede-ef3b0a5a8fcf
 5      type: similar
 6status: test
 7description: Detects usage of COM objects that can be abused to download files in PowerShell by CLSID
 8references:
 9    - https://learn.microsoft.com/en-us/dotnet/api/system.type.gettypefromclsid?view=net-7.0
10    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=57
11author: frack113
12date: 2022/12/25
13tags:
14    - attack.command_and_control
15    - attack.t1105
16logsource:
17    product: windows
18    category: ps_script
19    definition: Script Block Logging must be enable
20detection:
21    selection_1:
22        ScriptBlockText|contains: '[Type]::GetTypeFromCLSID('
23    selection_2:
24        ScriptBlockText|contains:
25            - '0002DF01-0000-0000-C000-000000000046'
26            - 'F6D90F16-9C73-11D3-B32E-00C04F990BB4'
27            - 'F5078F35-C551-11D3-89B9-0000F81FE221'
28            - '88d96a0a-f192-11d4-a65f-0040963251e5'
29            - 'AFBA6B42-5692-48EA-8141-DC517DCF0EF1'
30            - 'AFB40FFD-B609-40A3-9828-F88BBE11E4E3'
31            - '88d96a0b-f192-11d4-a65f-0040963251e5'
32            - '2087c2f4-2cef-4953-a8ab-66779b670495'
33            - '000209FF-0000-0000-C000-000000000046'
34            - '00024500-0000-0000-C000-000000000046'
35    condition: all of selection_*
36falsepositives:
37    - Legitimate use of the library
38level: medium

References

  • Type.GetTypeFromCLSID Method (System)

    Gets the type associated with the specified class identifier (CLSID).


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  • Hunting for PowerShell Abuse

    PowerShell is the favorit tool of IT guys, who are responsible for administration of Windows infrastructures. It allows them to manage differen services of the operating system and automate almost anything. But along with administrators, PowerShell also is liked by attackers and malware authors. The reason PowerShell is so attractive for adversaries is quite obvious: it has been included in essentially every Windows operating system by default for a decade, provides access to Windows API, and is rarely constrained, thus allowing adversaries to perform different tasks without risking being blocked. ttackers can use PowerShell to direct the execution of a local script, retrieve and execute remote resources using various network protocols, encode payloads passed via the command line, or load PowerShell into other processes. Because of so prevalence of PowerShell among adversaries for Threat Hunters it is very important to be able to detect malicious uses of PowerShell and defend against it. In the presentation author is going to demostrate an approaches for detection of PowerShell abuses based on different event sources like native Windows logging capabilities as well as usage of additional tools, like Sysmon or EDR solutions. How to collect traces of using PowerShell, how to filter out false positives, and how to find evidence of malicious uses among the remaining after filtering volume of events — all these questions will be answered in the talk for present and future threat hunters.


    Read More

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