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UKC-1230 is a threat activity cluster tracked by Black Hills Information Security (BHIS). BHIS reported a stealthy, long-term Windows persistence and command-and-control technique observed during a breach assessment. The actor modified legacy Windows scheduled tasks, particularly User_Feed_Synchronization-{GUID}, to use a ComHandler that invoked attacker-registered COM objects. This caused dllhost.exe (COM Surrogate) to load malicious surrogate DLLs for code execution. BHIS identified the corresponding COM registrations under HKCR\CLSID{GUID}\InprocServer32 pointing to attacker DLLs, most commonly stored as GUID-named files under C:\ProgramData\Microsoft\Windows{GUID}.dll, with one observed case under a user profile AppData path. BHIS noted that each DLL used a different SHA-256 hash, but the samples shared a consistent imphash of c4f69d93110080cc2432c9cc3d2c58ab. BHIS also observed attempted beaconing to infrastructure associated with techdataservice[.]us, including push.techdataservice[.]us resolving to 38.180.143.167, and identified additional related subdomains under that domain. BHIS assessed that the intrusion persisted for at least seven months in the victim environment, with artifacts in the wild indicating the technique has been used for over a year and dating back to 2024-01-31. The initial access vector was inconclusive. No aliases or sub-groups beyond UKC-1230 are provided in the content.
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