Potentially Suspicious Execution From Tmp Folder

A Sigma rule for process creation on Linux, by Joseliyo Sanchez, @Joseliyo_Jstnk.

medium 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it

detection:
  filter_optional_nextcloud:
    Image|endswith: '/usr/bin/nextcloud'
  selection:
    Image|startswith: '/tmp/'
  condition: selection and not 1 of filter_optional_*

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Joseliyo Sanchez, @Joseliyo_Jstnk, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

None of the everyday examples and documented commands on CmdID’s program pages trips it. To see whether a command line does, paste it into CmdID.

ATT&CK

the techniques it is tagged with

T1036Masquerading

Potentially Suspicious Execution From Tmp Folder

What it looks for

ATT&CK

Other rules for T1036 Masquerading