Find sigma rule
Attack: Signed Binary Proxy Execution
Adversaries may bypass process and/or signature-based defenses by proxying execution of malicious content with signed, or otherwise trusted, binaries. Binaries used in this technique are often Microsoft-signed files, indicating that they have been either downloaded from Microsoft or are already native in the operating system.(Citation: LOLBAS Project) Binaries signed with trusted digital certificates can typically execute on Windows systems protected by digital signature validation. Several Microsoft signed binaries that are default on Windows installations can be used to proxy execution of other files or commands.
Similarly, on Linux systems adversaries may abuse trusted binaries such as split
to proxy execution of malicious commands.(Citation: split man page)(Citation: GTFO split)
MITRE
Tactic
- defense-evasion
technique
- T1218
Test : ProtocolHandler.exe Downloaded a Suspicious File
OS
- windows
Description:
Emulates attack via documents through protocol handler in Microsoft Office. On successful execution you should see Microsoft Word launch a blank file.
Executor
command_prompt
Sigma Rule
-
proc_creation_win_protocolhandler_download.yml (id: 104cdb48-a7a8-4ca7-a453-32942c6e5dcb)
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proc_creation_win_office_arbitrary_cli_download.yml (id: 4ae3e30b-b03f-43aa-87e3-b622f4048eed)
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registry_event_office_trust_record_modification.yml (id: 295a59c1-7b79-4b47-a930-df12c15fc9c2)