NSIS DLL loader

rule NSIS_called_dll
{
    meta:
        description = "NSIS_called_dll"
        author = "James_inthe_box"
        reference = "https://app.any.run/tasks/a1be5611-57aa-43ef-b1bd-55efe397a593"
        date = "2019/01"
        maltype = "Unknown"

    strings:
        $string1 = "WaitForSingleObject"
        $string2 = "winapp"
        $string3 = "CreateMutexA"
        $string4 = "GetCurrentProcessId"
        $string5 = "_load4@0"
        $string6 = "OpenProcess"
        $string7 = "KERNEL32.dll"

    condition:
        uint16(0) == 0x5A4D and uint8(uint32(0x3c)+23) == 0x21 and (all of ($string*))
}