← All detection heuristics · Shellcode
critical
SC_STR_URLDOWNLOAD
What it means
String 'URLDownloadToFile' found in file bytes.
Why it fires
URLDownloadToFile downloads a file from the internet to disk. This is one of the most common APIs used by shellcode to fetch and save second-stage malware. Its presence is a high-signal indicator of malicious intent.
Other Shellcode heuristics
SC_STR_CREATEREMOTETHREAD SC_MSF_BIND SC_MSF_REVERSE SC_MSF_C2 SC_STR_WRITEPROCESSMEMORY SC_XOR_ENCODED SC_STR_CREATEPROCESS SC_EGG_HUNTER SC_STR_GETPROCADDRESS SC_HEAP_SPRAY SC_STR_LOADLIBRARY SC_API_HASH_RESOLVER SC_PEB_ACCESS_X64 SC_PEB_ACCESS SC_STR_POWERSHELL SC_STR_SHELLEXEC SC_STR_WINEXEC SC_STR_WSCRIPT SC_XOR_DECODER SC_XOR_DECODED_NETWORK_CONFIG SC_STR_BITSADMIN SC_STR_CERTUTIL SC_STR_CMD SC_STR_MSHTA