C# IL Code Compilation Via Ilasm.EXE

calendar Aug 12, 2024 · attack.defense-evasion attack.t1127  ·
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Detects the use of "Ilasm.EXE" in order to compile C# intermediate (IL) code to EXE or DLL.

Sigma rule (View on GitHub)

 1title: C# IL Code Compilation Via Ilasm.EXE
 2id: 850d55f9-6eeb-4492-ad69-a72338f65ba4
 3status: test
 4description: Detects the use of "Ilasm.EXE" in order to compile C# intermediate (IL) code to EXE or DLL.
 5references:
 6    - https://lolbas-project.github.io/lolbas/Binaries/Ilasm/
 7    - https://www.echotrail.io/insights/search/ilasm.exe
 8author: frack113, Nasreddine Bencherchali (Nextron Systems)
 9date: 2022-05-07
10modified: 2022-05-16
11tags:
12    - attack.defense-evasion
13    - attack.t1127
14logsource:
15    product: windows
16    category: process_creation
17detection:
18    selection_img:
19        - Image|endswith: '\ilasm.exe'
20        - OriginalFileName: 'ilasm.exe'
21    selection_cli:
22        CommandLine|contains:
23            - ' /dll'
24            - ' /exe'
25    condition: all of selection_*
26falsepositives:
27    - Unknown
28level: medium

References

  • Ilasm on LOLBAS

    Ilasm.exe is a living-of-the-land file containing unexpected functionality that can be abused by attackers; this page lists all its use cases.


    Read More

  • EchoTrail

    Endpoint log security platform.


    Read More

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