CmdID / Rules / Windows

Potential Compromised 3CXDesktopApp Execution

A Sigma rule for process creation on Windows, from SigmaHQ’s emerging threats rules, by Nasreddine Bencherchali (Nextron Systems).

high 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection_hashes:
    Hashes|contains:
      - 'SHA256=DDE03348075512796241389DFEA5560C20A3D2A2EAC95C894E7BBED5E85A0ACC'
      - 'SHA256=54004DFAA48CA5FA91E3304FB99559A2395301C570026450882D6AAD89132A02'
      - 'SHA256=D45674F941BE3CCA2FBC1AF42778043CC18CD86D95A2ECB9E6F0E212ED4C74AE'
      - 'SHA1=480DC408EF50BE69EBCF84B95750F7E93A8A1859'
      - 'SHA1=3B43A5D8B83C637D00D769660D01333E88F5A187'
      - 'SHA1=6285FFB5F98D35CD98E78D48B63A05AF6E4E4DEA'
      - 'MD5=BB915073385DD16A846DFA318AFA3C19'
      - 'MD5=08D79E1FFFA244CC0DC61F7D2036ACA9'
      - 'MD5=4965EDF659753E3C05D800C6C8A23A7A'
      - 'SHA256=FAD482DED2E25CE9E1DD3D3ECC3227AF714BDFBBDE04347DBC1B21D6A3670405'
      - 'SHA256=5D99EFA36F34AA6B43CD81E77544961C5C8D692C96059FEF92C2DF2624550734'
      - 'SHA256=A60A61BF844BC181D4540C9FAC53203250A982E7C3AD6153869F01E19CC36203'
      - 'SHA1=E272715737B51C01DC2BED0F0AEE2BF6FEEF25F1'
      - 'SHA1=8433A94AEDB6380AC8D4610AF643FB0E5220C5CB'
      - 'SHA1=413D9CBFCBF8D1E8304EAB0AA5484F5EEC5185F5'
      - 'MD5=9833A4779B69B38E3E51F04E395674C6'
      - 'MD5=704DB9184700481A56E5100FB56496CE'
      - 'MD5=8EE6802F085F7A9DF7E0303E65722DC0'
      - 'SHA256=AA124A4B4DF12B34E74EE7F6C683B2EBEC4CE9A8EDCF9BE345823B4FDCF5D868'
      - 'SHA256=59E1EDF4D82FAE4978E97512B0331B7EB21DD4B838B850BA46794D9C7A2C0983'
      - 'SHA1=BEA77D1E59CF18DCE22AD9A2FAD52948FD7A9EFA'
      - 'SHA1=BFECB8CE89A312D2EF4AFC64A63847AE11C6F69E'
      - 'MD5=F3D4144860CA10BA60F7EF4D176CC736'
      - 'MD5=0EEB1C0133EB4D571178B2D9D14CE3E9'
  selection_pe_1:
    - OriginalFileName: '3CXDesktopApp.exe'
    - Image|endswith: '\3CXDesktopApp.exe'
    - Product: '3CX Desktop App'
  selection_pe_2:
    FileVersion|contains: '18.12.'
  condition: all of selection_pe_* or selection_hashes

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 Nasreddine Bencherchali (Nextron Systems), 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

T1218System Binary Proxy Execution

Potential Compromised 3CXDesktopApp Execution

What it looks for

ATT&CK

Other rules for T1218 System Binary Proxy Execution