Potential DLL File Download Via PowerShell Invoke-WebRequest

calendar Jul 28, 2025 · attack.command-and-control attack.execution attack.t1059.001 attack.t1105  ·
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Detects potential DLL files being downloaded using the PowerShell Invoke-WebRequest or Invoke-RestMethod cmdlets.

Sigma rule (View on GitHub)

 1title: Potential DLL File Download Via PowerShell Invoke-WebRequest
 2id: 0f0450f3-8b47-441e-a31b-15a91dc243e2
 3status: test
 4description: Detects potential DLL files being downloaded using the PowerShell Invoke-WebRequest or Invoke-RestMethod cmdlets.
 5references:
 6    - https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution
 7author: Florian Roth (Nextron Systems), Hieu Tran
 8date: 2023-03-13
 9modified: 2025-07-18
10tags:
11    - attack.command-and-control
12    - attack.execution
13    - attack.t1059.001
14    - attack.t1105
15logsource:
16    product: windows
17    category: process_creation
18detection:
19    selection:
20        CommandLine|contains:
21            - 'Invoke-RestMethod '
22            - 'Invoke-WebRequest '
23            - 'IRM '
24            - 'IWR '
25        CommandLine|contains|all:
26            - 'http'
27            - 'OutFile'
28            - '.dll'
29    condition: selection
30falsepositives:
31    - Unknown
32level: medium

References

  • OneNote | ThreatLabz

    Zscaler ThreatLabz team observed multiple OneNote malware campaign spreading RATs, Bankers, and Stealer category malware with multi-layer obfuscation.


    Read More

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