A modular Go source code level control flow obfuscator, made in Go.
Runs the selected module on the target project.
Usage:
λ ejja run --project "samples" --module "flattener" --functions "main","fibonacci"
[+] Running flattener..
[+] Found function `main` in `test.go` ..
[+] Emitting transformed function..
func main(){
a := []int{2, 212, 3001, 14, 501, 7800, 9932, 33, 45, 45, 45, 91, 99, 37, 102, 102, 104, 106, 109, 106}
i := 0
var c13qkfjm9cj2a64v7a10 string
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a1g"
for c13qkfjm9cj2a64v7a10 != "c13qkfjm9cj2a64v7a20" {
switch(c13qkfjm9cj2a64v7a10){
case "c13qkfjm9cj2a64v7a1g":
a = []int{2, 212, 3001, 14, 501, 7800, 9932, 33, 45, 45, 45, 91, 99, 37, 102, 102, 104, 106, 109, 106}
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a2g"
break
case "c13qkfjm9cj2a64v7a2g":
fmt.Println(sort(a))
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a30"
break
case "c13qkfjm9cj2a64v7a30":
if (len(a) >= 1) {
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a40"
}else{
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a4g"
}
break
case "c13qkfjm9cj2a64v7a40":
fmt.Println("yes")
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a3g"
break
case "c13qkfjm9cj2a64v7a4g":
fmt.Println("no")
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a3g"
break
case "c13qkfjm9cj2a64v7a3g":
i = 0
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a60"
break
case "c13qkfjm9cj2a64v7a60":
if i < 5 {
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a5g"
}else{
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a50"
}
break
case "c13qkfjm9cj2a64v7a6g":
i++
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a60"
break
case "c13qkfjm9cj2a64v7a5g":
fmt.Println(i)
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a6g"
break
case "c13qkfjm9cj2a64v7a50":
fmt.Println(fibonacci(30))
c13qkfjm9cj2a64v7a10 = "c13qkfjm9cj2a64v7a20"
break
}
}
}
[+] Emitting transformed function..
func fibonacci(n int) int{
var c13qksrm9cj2kg5kgif0 string
c13qksrm9cj2kg5kgif0 = "c13qksrm9cj2kg5kgifg"
for c13qksrm9cj2kg5kgif0 != "c13qksrm9cj2kg5kgig0" {
switch(c13qksrm9cj2kg5kgif0){
case "c13qksrm9cj2kg5kgifg":
if (n <= 1) {
c13qksrm9cj2kg5kgif0 = "c13qksrm9cj2kg5kgih0"
}else{
c13qksrm9cj2kg5kgif0 = "c13qksrm9cj2kg5kgigg"
}
break
case "c13qksrm9cj2kg5kgih0":
return n
break
case "c13qksrm9cj2kg5kgigg":
return fibonacci(n-1) + fibonacci(n-2)
break
}
}
return n
}
[+] Done.
λ ejja run --project "C:\Users\kaftejiman\sampleGolangProject" --module "analyser"
[+] Running analyser..
=== Object Summary ===
basic objects : 2
array objects : 2
slice objects : 13
struct objects : 5
pointer objects : 2
tuple objects : 1
signature objects : 29
interface objects : 3
map objects : 0
chan objects : 1
[+] Done.Flattens the target function's control flow graph.
Implementation of the flattener algorithm in "OBFUSCATING C++ PROGRAMS VIA CONTROL FLOW FLATTENING" by T. L ́aszl ́o and ́A. Kiss.
- Name: flattener
- Usage:
ejja --project="example/project" --module="flattener" --function="main" - Description: The idea behind control flow flattening is to transform the structure of the source code in such a way that the targets of branches cannot be easily determined by static analysis, thus hindering the comprehension of the program.
Displays object metrics about the target project codebase, returns summary of object analysis.
- Name: analyser
- Usage:
ejja --project="example/project" --module="analyser" - Description: Runs an analysis on the target project's codebase, returns summary of object analysis.
Each module should export two required methods:
Manifest()-- Module manifestation with a unique name and description.Run()-- The entry point of the module.
You can use helper functions found in utils. They provide basic ast operations.
You can find a sample module in samples folder, move the sample module to modules folder for actually running.
Flattener module is lacking a lot as of now, I will be supporting more statements asap, feel free to PR.
Supported statements:
- ExprStatements
- IfStatements
- ForStatements
- ReturnStatements
- AssignmentStatements