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#Comodo internet code
#Comodo internet download

Depending on which ones are present, it executes different functionality. The first stager checks for the presence of a set of running processes.

#Comodo internet code

Delaying of code execution at different stages.

If a connection cannot be made, then HijackLoader does not proceed with the execution and enters an infinite loop until a connection is made.

Performing an HTTP connectivity test to a legitimate website (e.g.

Dynamic loading of Windows API functions by leveraging a custom API hashing technique.

The first stage includes a limited set of evasion techniques: The offsets for the configuration block detection (including the offset of the encryption key) might differ from sample to sample. The above configuration block is detected by using hardcoded offsets and then decrypted either with a bitwise XOR or ADD operation.

A blocklist of process name hashes (described later in Table 1).

An offset for the payload URL (if any) along with an XOR key to decrypt it.

A DWORD value, which is used for detecting all blobs of the encrypted payload.

A DWORD value, which is used for validating the payload, when loaded from disk, by searching it in the payload’s data.A DWORD seed value, which is used for deriving a string based on the compromised host’s username.For example, the constant PAGE_EXECUTE_READWRITE (0x40) for VirtualProtect. Parameters for several Windows API functions.The offsets for these fields might differ from sample to sample.

#Comodo internet download

An array of DWORDs, which are used to determine if the loader has to download the final payload.Windows API hashes for dynamic loading.A DWORD hash value to detect the next stage (e.g., the ti module described later in the text) from the modules table.To achieve this, HijackLoader includes an encrypted configuration, which stores information such as: Upon execution, HijackLoader starts by executing a modified (hooked) function of the Windows C Runtime (CRT), which points to the entry point of the first stage.ĭuring its initialization phase, the loader determines if the final payload has been embedded in the binary or if it needs to download it from an external server.