Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt

A Sigma rule for process creation on Windows, from SigmaHQ’s emerging threats rules, by Bhabesh Raj.

high 2 ATT&CK techniques 1 program it names

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection:
    CommandLine|contains:
      - 'certutil'
      - 'cmd /c'
      - 'cmd /k'
      - 'cscript'
      - 'curl'
      - 'ipconfig'
      - 'powershell'
      - 'pwsh'
      - 'regsvr32'
      - 'rundll32'
      - 'whoami'
      - 'wscript'
    ParentImage|endswith: '\Atlassian\Confluence\jre\bin\java.exe'
  condition: selection

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 Bhabesh Raj, 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.

Programs and files it names

their pages here

java.exe

ATT&CK

the techniques it is tagged with

T1059Command and Scripting Interpreter

T1190Exploit Public-Facing Application

Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt

What it looks for

Programs and files it names

ATT&CK

Other rules for T1059 Command and Scripting Interpreter