Hunt: signed SiemensSoftwareCenter.exe side-loading archive.dll from AppData (Romulus ClickFix, CVE-2026-110936)
Context: Siemens Software Center exploitation. The Siemens file is genuine and signed, so Siemens says to detect on folder and behaviour, not on its hash.
- Process lineage:
SiemensSoftwareCenter.exerunning from%LOCALAPPDATA%\Programs\(look for aSM Software Provisioning Servicefolder) withmsiexec.exeas parent, especially on PCs with no Siemens engineering software. KQL sketch:DeviceProcessEvents | where FileName =~ "SiemensSoftwareCenter.exe" and FolderPath has @"\AppData\Local\Programs\" | where InitiatingProcessFileName =~ "msiexec.exe". - Side-loaded DLLs: image loads by that process of DLLs not signed by Siemens, or files next to it named
activate.bakorstatinfosta.DB. Known hashes (SHA-256):AllMyBasic.msif4d7c5321bb0d1bda439304a753bcf9b467b98ca53c7e9493b9c2c3451092e4a,archive.dll3fdcc7d7d049a89711fb31fb236940a1c5a09d899143ffd20c3c41fb1f2cf491. - Persistence: a "Siemens Software Center" Run key / startup entry or scheduled task on machines that never had it installed; a
%LOCALAPPDATA%\FTSuite\ftc.umlfile. - Network: connections or DNS for
96.62.218[.]59andwizardexpensive[.]com(active C2/payload hosting per Siemens) and historical downloads from2.27.248[.]127(inactive distribution host; earlier victims may still be infected). - ClickFix precursor: RunMRU entries or PowerShell/
mshta/msiexeclaunched fromexplorer.exeright after browser activity, i.e. a user pasting a command from a fake "I am not a robot" page. - If found: isolate, kill the process first, then remove the startup entry and task, and reset the user's passwords (Siemens guidance).
Sources: Siemens ProductCERT blog (IOCs) · Siemens SSA-580366