String Obfuscator

Obfuscates strings using a polymorphic engine. Creates a chain of transformations which are then reversed to generate the decryption routine. Each time its ran it generates a unique routine.

Note: This is the command line version of the Java Spring backend project here

Language Targets

Usage

usage: strobf [-h] [-l MIN_OPS] [-u MAX_OPS] [-b MAX_BITS] -t LANG [-i INPUT | -f FILE | -s]

Obfuscates a string using a polymorphic engine into different languages. Generates a decryption/deobfuscation routine in any of the following target languages (which can be specified using the -t or
--target parameter): bash, c#, c_sharp, csharp, c, cpp, c++, javascript, js, java, masm64, powershell, ps, python, py

optional arguments:
  -h, --help            show this help message and exit
  -l MIN_OPS, --min-ops MIN_OPS
                        minimum number of transformations
  -u MAX_OPS, --max-ops MAX_OPS
                        maximum number of transformations
  -b MAX_BITS, --max-bits MAX_BITS
                        number of bits to encode chars into
  -t LANG, --target LANG
                        language to encode decryption routine
  -i INPUT, --input INPUT
                        text to encrypt
  -f FILE, --file FILE  read from input file
  -s, --stdin           read from stdin

Examples

Suppose you want to obfuscate a string and generate a deobfuscation routine in powershell (aliases work, in this case ps):

# Read from stdin
cat .\file.txt | python3 strobf.py -t "ps" -s
# Read from file
python3 strobf.py -t "ps" -f .\file.txt
# Read from input
python3 strobf.py -t "ps" -i "Hello World!"

Generation Examples

C & C++ Target Example

wchar_t string[12] = {0xe7e5,0xef5f,0xee64,0xee64,0xeeac,0xe6d7,0xef9e,0xeeac,0xef24,0xee64,0xef57,0xe6df};
for (unsigned int qiTILYFPbT=0, OzYohOKxe, ZNtEkIj; qiTILYFPbT < 12; qiTILYFPbT++) {
	OzYohOKxe = string[qiTILYFPbT];
	ZNtEkIj = ((OzYohOKxe >> 0x4) ^ (OzYohOKxe >> 0x2)) & ((1 << 0x2) - 1);
	OzYohOKxe ^= (ZNtEkIj << 0x4) | (ZNtEkIj << 0x2);
	OzYohOKxe -= 0x2c16;
	OzYohOKxe = (((OzYohOKxe & 0xffff) << 0x7) | (OzYohOKxe >> 0x9)) & 0xffff;
	OzYohOKxe = (((OzYohOKxe & 0xffff) >> 0x5) | (OzYohOKxe << 0xb)) & 0xffff;
	ZNtEkIj = ((OzYohOKxe >> 0xb) ^ (OzYohOKxe >> 0x2)) & ((1 << 0x2) - 1);
	OzYohOKxe ^= (ZNtEkIj << 0xb) | (ZNtEkIj << 0x2);
	OzYohOKxe = (((OzYohOKxe & 0xffff) >> 0x7) | (OzYohOKxe << 0x9)) & 0xffff;
	OzYohOKxe -= 0xdb6;
	string[qiTILYFPbT] = OzYohOKxe;
}
wprintf(string);

C# Target Example

var str = new System.Text.StringBuilder("\u69c5\u4f85\u79a5\u79a5\u65a5\u4b65\u45c5\u65a5\u41a5\u79a5\u5b85\u7d65");
for (int dSouLvBYK=0, ZFKLohnHzM, TnaNQlKjk; dSouLvBYK < str.Length; dSouLvBYK++) {
	ZFKLohnHzM = str[dSouLvBYK];
	TnaNQlKjk = ((ZFKLohnHzM >> 0x5) ^ (ZFKLohnHzM >> 0xa)) & ((1 << 0x4) - 1);
	ZFKLohnHzM ^= (TnaNQlKjk << 0x5) | (TnaNQlKjk << 0xa);
	ZFKLohnHzM = (((ZFKLohnHzM & 0xffff) << 0xb) | (ZFKLohnHzM >> 0x5)) & 0xffff;
	ZFKLohnHzM += 0x2d3d;
	TnaNQlKjk = ((ZFKLohnHzM >> 0x3) ^ (ZFKLohnHzM >> 0x3)) & ((1 << 0x9) - 1);
	ZFKLohnHzM ^= (TnaNQlKjk << 0x3) | (TnaNQlKjk << 0x3);
	ZFKLohnHzM ^= 0xc60e;
	ZFKLohnHzM -= 0x118d;
	ZFKLohnHzM ^= 0x1bbb;
	ZFKLohnHzM ^= 0x6970;
	ZFKLohnHzM = ~ZFKLohnHzM & 0xffff;
	str[dSouLvBYK] = (char) ZFKLohnHzM;
}
Console.WriteLine(str);

Java Target Example

StringBuilder string = new StringBuilder("\u2be6\uabec\uebfe\uebfe\uabe0\uabf7\ue7f1\uabe0\u6bfa\uebfe\uabee\uabf5");
for (int LuLHaKFh=0, oY_FOvLH, eebCvtC; LuLHaKFh < string.length(); LuLHaKFh++) {
    oY_FOvLH = string.charAt(LuLHaKFh);
    oY_FOvLH = (((oY_FOvLH & 0xffff) << 0x6) | (oY_FOvLH >> 0xa)) & 0xffff;
    eebCvtC = ((oY_FOvLH >> 0x0) ^ (oY_FOvLH >> 0x7)) & ((1 << 0x4) - 1);
    oY_FOvLH ^= (eebCvtC << 0x0) | (eebCvtC << 0x7);
    oY_FOvLH ^= 0x600f;
    oY_FOvLH -= 0x2aa2;
    oY_FOvLH += 0x25b0;
    oY_FOvLH ^= 0x9852;
    string.setCharAt(LuLHaKFh, (char) oY_FOvLH);
}
System.out.println(string);

Python Target Example

string = [0xbaec,0x3b6a,0xbbee,0xbbee,0x3be9,0xbb08,0x3b6d,0x3be9,0xbbeb,0xbbee,0xbb6a,0x3b08]
for ehNxDDeClr in range(len(string)):
	JvYJM = string[ehNxDDeClr]
	JvYJM = ~JvYJM & 0xffff
	rukl = ((JvYJM >> 0x7) ^ (JvYJM >> 0x3)) & ((1 << 0x2) - 1)
	JvYJM ^= (rukl << 0x7) | (rukl << 0x3)
	JvYJM = (((JvYJM & 0xffff) << 0x2) | (JvYJM >> 0xe)) & 0xffff
	JvYJM ^= 0x4f69
	JvYJM -= 0x179c
	rukl = ((JvYJM >> 0x6) ^ (JvYJM >> 0x6)) & ((1 << 0x3) - 1)
	JvYJM ^= (rukl << 0x6) | (rukl << 0x6)
	JvYJM = (((JvYJM & 0xffff) >> 0x1) | (JvYJM << 0xf)) & 0xffff
	JvYJM -= 0x217c
	string[ehNxDDeClr] = chr(JvYJM & 0xffff)
del ehNxDDeClr, JvYJM, rukl
string = ''.join(string)
print(string)

JavaScript Target Example

var string = [0x346e,0x22ee,0x266e,0x266e,0x27ee,0x6e,0x3bee,0x27ee,0x296e,0x266e,0x226e,0xee];
for (var LeKvHT=0, bpbEN; LeKvHT < string.length; LeKvHT++) {
	bpbEN = string[LeKvHT];
	bpbEN = (((bpbEN & 0xffff) << 0xb) | (bpbEN >> 0x5)) & 0xffff;
	bpbEN = ~bpbEN & 0xffff;
	bpbEN = (((bpbEN & 0xffff) << 0xf) | (bpbEN >> 0x1)) & 0xffff;
	bpbEN = ~bpbEN & 0xffff;
	bpbEN ^= 0xb841;
	bpbEN = (((bpbEN & 0xffff) >> 0x1) | (bpbEN << 0xf)) & 0xffff;
	string[LeKvHT] = bpbEN;
}
string = String.fromCodePoint(...string);
console.log(string);

PowerShell Target Example

[uint64[]]$HZaRySkFpz = 0x67b1,0xf791,0xd7b1,0xd7b1,0xc7d1,0x7b1,0x27d1,0xc7d1,0xb7f1,0xd7b1,0xf7b1,0x791
$string = [System.Text.StringBuilder]::new()
for ($ONsGU = 0; $ONsGU -lt $HZaRySkFpz.Length; $ONsGU++) {
	$XKvkUzFdZ = $HZaRySkFpz[$ONsGU]
	$XKvkUzFdZ = ((($XKvkUzFdZ -band 0xffff) -shl 0x2) -bor ($XKvkUzFdZ -shr 0xe)) -band 0xffff
	$XKvkUzFdZ = ((($XKvkUzFdZ -band 0xffff) -shr 0xf) -bor ($XKvkUzFdZ -shl 0x1)) -band 0xffff
	$QCjLahqh = (($XKvkUzFdZ -shr 0x7) -bxor ($XKvkUzFdZ -shr 0xc)) -band ((1 -shl 0x3) - 1)
	$XKvkUzFdZ = $XKvkUzFdZ -bxor (($QCjLahqh -shl 0x7) -bor ($QCjLahqh -shl 0xc))
	$XKvkUzFdZ = ((($XKvkUzFdZ -band 0xffff) -shr 0xc) -bor ($XKvkUzFdZ -shl 0x4)) -band 0xffff
	$XKvkUzFdZ = -bnot $XKvkUzFdZ -band 0xffff
	$XKvkUzFdZ = ((($XKvkUzFdZ -band 0xffff) -shl 0xf) -bor ($XKvkUzFdZ -shr 0x1)) -band 0xffff
	$XKvkUzFdZ += 0x2282
	$QCjLahqh = (($XKvkUzFdZ -shr 0xa) -bxor ($XKvkUzFdZ -shr 0xb)) -band ((1 -shl 0x4) - 1)
	$XKvkUzFdZ = $XKvkUzFdZ -bxor (($QCjLahqh -shl 0xa) -bor ($QCjLahqh -shl 0xb))
	$XKvkUzFdZ = $XKvkUzFdZ -bxor 0x4a60
	[void]$string.Append([char]($XKvkUzFdZ -band 0xffff))
}
$XKvkUzFdZ = [void]$XKvkUzFdZ
$ONsGU = [void]$ONsGU
$HZaRySkFpz = [void]$HZaRySkFpz
$QCjLahqh = [void]$QCjLahqh
$string = $string.ToString()
Write-Host $string

Bash Target Example

string=( 0x8cfa 0x873c 0x8b3a 0x8b3a 0x8a3c 0x89ba 0x861c 0x8a3c 0x885a 0x8b3a 0x873a 0x89bc )
for bEkkOsPjN in ${!string[@]}; do
	xC_adWJDY=${string[$bEkkOsPjN]}
	((yLexvN = ((xC_adWJDY >> 0x3) ^ (xC_adWJDY >> 0x3)) & ((1 << 0xb)-1)))
	((xC_adWJDY ^= (yLexvN << 0x3) | (yLexvN << 0x3)))
	((xC_adWJDY = (((xC_adWJDY & 0xffff) << 0xc) | (xC_adWJDY >> 0x4)) & 0xffff))
	((xC_adWJDY = (((xC_adWJDY & 0xffff) << 0xa) | (xC_adWJDY >> 0x6)) & 0xffff))
	((xC_adWJDY += 0x243c))
	((xC_adWJDY = (((xC_adWJDY & 0xffff) << 0x9) | (xC_adWJDY >> 0x7)) & 0xffff))
	((xC_adWJDY -= 0x186d))
	((xC_adWJDY += 0x396b))
	((xC_adWJDY -= 0xc3b))
	((yLexvN = ((xC_adWJDY >> 0x1) ^ (xC_adWJDY >> 0x7)) & ((1 << 0x3)-1)))
	((xC_adWJDY ^= (yLexvN << 0x1) | (yLexvN << 0x7)))
	((xC_adWJDY ^= 0xd246))
	string[$bEkkOsPjN]=$xC_adWJDY
done
unset bEkkOsPjN
unset xC_adWJDY
unset yLexvN
string=$(printf %b "$(printf '\\U%x' "${string[@]}")")
echo $string

MASM 64 bit Target Example

extern GetStdHandle: proc
extern WriteFile: proc
extern GetFileType: proc
extern WriteConsoleW: proc

.data?
	stdout	dq ?
	written	dq ?
.data
	string dw 0c5d7h,0afd8h,0b457h,0b457h,0add7h,065d8h,0edd6h,0add7h,0c756h,0b457h,0b458h,06f58h
	len	equ $-string
.code
main proc
	push	rbp
	mov	rbp, rsp
	sub	rsp, 32
	and	rsp, -10h

	mov	rbx, offset string
	xor	rcx, rcx
Qjlc:
	xor	rax, rax
	xor	rdx, rdx
	xor	r8, r8
	xor	r9, r9
	xor	r10, r10
	mov	dx, word ptr [rbx + rcx*2]
	mov	r8w, dx
	shr	r8w, 7
	mov	r9w, dx
	shr	r9w, 10
	xor	r8w, r9w
	mov	r9w, 1
	shl	r9w, 2
	sub	r9w, 1
	and	r8w, r9w
	mov	r9w, r8w
	shl	r9w, 7
	mov	r10w, r8w
	shl	r10w, 10
	or	r9w, r10w
	xor	dx, r9w
	sub	dx, 14630
	ror	dx, 13
	ror	dx, 14
	mov	r8w, dx
	shr	r8w, 5
	mov	r9w, dx
	shr	r9w, 0
	xor	r8w, r9w
	mov	r9w, 1
	shl	r9w, 2
	sub	r9w, 1
	and	r8w, r9w
	mov	r9w, r8w
	shl	r9w, 5
	mov	r10w, r8w
	shl	r10w, 0
	or	r9w, r10w
	xor	dx, r9w
	sub	dx, 293
	not	dx
	rol	dx, 3
	xor	dx, 22228
	mov	word ptr [rbx + rcx*2], dx
	inc	cx
	cmp	cx, 12
	jne	Qjlc

	; Printing code
	xor	rax, rax
	xor	rcx, rcx
	xor	rdx, rdx
	xor	r8, r8
	xor	r9, r9
	mov	rcx, -11
	call	GetStdHandle
	mov	[stdout], rax
	mov	rcx, rax
	call	GetFileType
	cmp	rax, 1
	je	fileWrite
	mov	rcx, [stdout]
	mov	rdx, rbx
	mov	r8, len
	mov	r9, written
	call	WriteConsoleW
	jmp	epilog
fileWrite:
	mov	rcx, [stdout]
	mov	rdx, rbx
	mov	r8, len
	mov	r9, written
	call	WriteFile
epilog:
	add	rsp, 32
	mov	rsp, rbp
	pop	rbp
	ret
main endp
end

Name		Name	Last commit message	Last commit date
Latest commit History 25 Commits
core		core
tests		tests
.gitignore		.gitignore
ReadMe.md		ReadMe.md
strobf.py		strobf.py

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String Obfuscator

Language Targets

Usage

Examples

Generation Examples

C & C++ Target Example

C# Target Example

Java Target Example

Python Target Example

JavaScript Target Example

PowerShell Target Example

Bash Target Example

MASM 64 bit Target Example

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String Obfuscator

Language Targets

Usage

Examples

Generation Examples

C & C++ Target Example

C# Target Example

Java Target Example

Python Target Example

JavaScript Target Example

PowerShell Target Example

Bash Target Example

MASM 64 bit Target Example

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