Suspicious Desktopimgdownldr Command

A Sigma rule for process creation on Windows, by Florian Roth (Nextron Systems).

high 1 ATT&CK technique

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection1:
    CommandLine|contains: ' /lockscreenurl:'
  selection1_filter:
    CommandLine|contains:
      - '.jpg'
      - '.jpeg'
      - '.png'
  selection_reg:
    CommandLine|contains|all:
      - 'reg delete'
      - '\PersonalizationCSP'
  condition: ( selection1 and not selection1_filter ) or selection_reg

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 Florian Roth (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.

Command lines that trip it

documented abuse, read by CmdID

The commands LOLBAS or GTFOBins documents for desktopimgdownldr.exe trip it: each is on its program’s page, read by CmdID.

ATT&CK

the techniques it is tagged with

T1105Ingress Tool Transfer

Suspicious Desktopimgdownldr Command

What it looks for

Command lines that trip it

ATT&CK

Other rules for T1105 Ingress Tool Transfer