Cybertalents Practice - Malware Reverse Engineering : Eye of Sauron [Write Up]






Yup Kembali lagi bersama gw Yukinoshita 47 babeh kalian di GSH yang tercinta ini wkwkwkwkwkwk biase kali ini gw mau share tentang CTF lagi. kali ini gw memberanikan diri untuk ikutan CTF yang Reverse Engineering karena banyak haters GSH nantang buat bikin konten Reverse Engineering ok gpp kita ladenin aja :v

challenge kali ini adalah Eye of Sauron kategori nya Malware Reverse Engineering

inilah penampakan eye of sauron




Q : WOI BNGST KNTL MMQ JMBT MATA DAJJAL ITU MAH
A : Lu tau tuh Mata Dajjal tp nape lu males ibadah ?

udah udah cukup intermezzo nya mari kita ke TKP

oke berikut ini challenge nya

Can you find the key to pass? Link:https://s3-eu-west-1.amazonaws.com/talentchallenges/Reverse/Inkie.zip
 

gw download dulu file nya dan gw copy file Inkie.exe nya karena yg 1 buat di reverse atau dibongkar yg 1 lagi buat dijalanin.



challenge nya seperti ini disuruh nyari key nya


gw buka software Inkie.exe nya gw disini pake CodeReflect


disini gw nemuin kode hash pada bagian InitializeComponent() : Void di FormLabel2, FormLabel3, FormLabel4, dan FormLabel5 lebih detail cek di gambar



ini Source Code bagian InitializeComponent() : Void

 .method private hidebysig instance void InitializeComponent() cil managed
{
    // Method Start RVA 0x2184
    // Code Size 1078 (0x436)
    .maxstack 4
    L_0000: ldarg.0
    L_0001: newobj instance void [System.Windows.Forms]System.Windows.Forms.Label::.ctor()
    L_0006: stfld [Inkie]Inkie.Form1::label1
    L_000b: ldarg.0
    L_000c: newobj instance void [System.Windows.Forms]System.Windows.Forms.TextBox::.ctor()
    L_0011: stfld [Inkie]Inkie.Form1::txtPass
    L_0016: ldarg.0
    L_0017: newobj instance void [System.Windows.Forms]System.Windows.Forms.Button::.ctor()
    L_001c: stfld [Inkie]Inkie.Form1::btnCheck
    L_0021: ldarg.0
    L_0022: newobj instance void [System.Windows.Forms]System.Windows.Forms.Label::.ctor()
    L_0027: stfld [Inkie]Inkie.Form1::label2
    L_002c: ldarg.0
    L_002d: newobj instance void [System.Windows.Forms]System.Windows.Forms.Label::.ctor()
    L_0032: stfld [Inkie]Inkie.Form1::label3
    L_0037: ldarg.0
    L_0038: newobj instance void [System.Windows.Forms]System.Windows.Forms.Label::.ctor()
    L_003d: stfld [Inkie]Inkie.Form1::label4
    L_0042: ldarg.0
    L_0043: newobj instance void [System.Windows.Forms]System.Windows.Forms.Label::.ctor()
    L_0048: stfld [Inkie]Inkie.Form1::label5
    L_004d: ldarg.0
    L_004e: call instance void [System.Windows.Forms]System.Windows.Forms.Control::SuspendLayout()
    L_0053: ldarg.0
    L_0054: ldfld [Inkie]Inkie.Form1::label1
    L_0059: ldc.i4.1
    L_005a: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_AutoSize(bool)
    L_005f: ldarg.0
    L_0060: ldfld [Inkie]Inkie.Form1::label1
    L_0065: ldc.i4.s 12
    L_0067: ldc.i4.s 80
    L_0069: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_006e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_0073: ldarg.0
    L_0074: ldfld [Inkie]Inkie.Form1::label1
    L_0079: ldstr "label1"
    L_007e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_0083: ldarg.0
    L_0084: ldfld [Inkie]Inkie.Form1::label1
    L_0089: ldc.i4 131
    L_008e: ldc.i4.s 13
    L_0090: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_0095: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_009a: ldarg.0
    L_009b: ldfld [Inkie]Inkie.Form1::label1
    L_00a0: ldc.i4.0
    L_00a1: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_00a6: ldarg.0
    L_00a7: ldfld [Inkie]Inkie.Form1::label1
    L_00ac: ldstr "Enter the key on the ring:"
    L_00b1: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_00b6: ldarg.0
    L_00b7: ldfld [Inkie]Inkie.Form1::txtPass
    L_00bc: ldc.i4 143
    L_00c1: ldc.i4.s 77
    L_00c3: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_00c8: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_00cd: ldarg.0
    L_00ce: ldfld [Inkie]Inkie.Form1::txtPass
    L_00d3: ldstr "txtPass"
    L_00d8: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_00dd: ldarg.0
    L_00de: ldfld [Inkie]Inkie.Form1::txtPass
    L_00e3: ldc.i4 129
    L_00e8: ldc.i4.s 20
    L_00ea: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_00ef: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_00f4: ldarg.0
    L_00f5: ldfld [Inkie]Inkie.Form1::txtPass
    L_00fa: ldc.i4.1
    L_00fb: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_0100: ldarg.0
    L_0101: ldfld [Inkie]Inkie.Form1::btnCheck
    L_0106: ldc.i4.s 105
    L_0108: ldc.i4.s 125
    L_010a: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_010f: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_0114: ldarg.0
    L_0115: ldfld [Inkie]Inkie.Form1::btnCheck
    L_011a: ldstr "btnCheck"
    L_011f: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_0124: ldarg.0
    L_0125: ldfld [Inkie]Inkie.Form1::btnCheck
    L_012a: ldc.i4.s 75
    L_012c: ldc.i4.s 23
    L_012e: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_0133: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_0138: ldarg.0
    L_0139: ldfld [Inkie]Inkie.Form1::btnCheck
    L_013e: ldc.i4.2
    L_013f: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_0144: ldarg.0
    L_0145: ldfld [Inkie]Inkie.Form1::btnCheck
    L_014a: ldstr "I shall Pass!"
    L_014f: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_0154: ldarg.0
    L_0155: ldfld [Inkie]Inkie.Form1::btnCheck
    L_015a: ldc.i4.1
    L_015b: callvirt instance void [System.Windows.Forms]System.Windows.Forms.ButtonBase::set_UseVisualStyleBackColor(bool)
    L_0160: ldarg.0
    L_0161: ldfld [Inkie]Inkie.Form1::btnCheck
    L_0166: ldarg.0
    L_0167: ldftn instance void [Inkie]Inkie.Form1::btnCheck_Click(object,class [mscorlib]System.EventArgs)
    L_016d: newobj instance void [mscorlib]System.EventHandler::.ctor(object,valuetype [mscorlib]System.IntPtr)
    L_0172: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::add_Click(class [mscorlib]System.EventHandler)
    L_0177: ldarg.0
    L_0178: ldfld [Inkie]Inkie.Form1::label2
    L_017d: ldc.i4.1
    L_017e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_AutoSize(bool)
    L_0183: ldarg.0
    L_0184: ldfld [Inkie]Inkie.Form1::label2
    L_0189: call valuetype [System.Drawing]System.Drawing.Color [System.Drawing]System.Drawing.SystemColors::get_Control()
    L_018e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_ForeColor(valuetype [System.Drawing]System.Drawing.Color)
    L_0193: ldarg.0
    L_0194: ldfld [Inkie]Inkie.Form1::label2
    L_0199: ldc.i4.s 12
    L_019b: ldc.i4 165
    L_01a0: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_01a5: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_01aa: ldarg.0
    L_01ab: ldfld [Inkie]Inkie.Form1::label2
    L_01b0: ldstr "label2"
    L_01b5: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_01ba: ldarg.0
    L_01bb: ldfld [Inkie]Inkie.Form1::label2
    L_01c0: ldc.i4.s 55
    L_01c2: ldc.i4.s 13
    L_01c4: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_01c9: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_01ce: ldarg.0
    L_01cf: ldfld [Inkie]Inkie.Form1::label2
    L_01d4: ldc.i4.3
    L_01d5: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_01da: ldarg.0
    L_01db: ldfld [Inkie]Inkie.Form1::label2
    L_01e0: ldstr "d0248b4e"
    L_01e5: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_01ea: ldarg.0
    L_01eb: ldfld [Inkie]Inkie.Form1::label3
    L_01f0: ldc.i4.1
    L_01f1: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_AutoSize(bool)
    L_01f6: ldarg.0
    L_01f7: ldfld [Inkie]Inkie.Form1::label3
    L_01fc: call valuetype [System.Drawing]System.Drawing.Color [System.Drawing]System.Drawing.SystemColors::get_Control()
    L_0201: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_ForeColor(valuetype [System.Drawing]System.Drawing.Color)
    L_0206: ldarg.0
    L_0207: ldfld [Inkie]Inkie.Form1::label3
    L_020c: ldc.i4.s 12
    L_020e: ldc.i4 178
    L_0213: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_0218: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_021d: ldarg.0
    L_021e: ldfld [Inkie]Inkie.Form1::label3
    L_0223: ldstr "label3"
    L_0228: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_022d: ldarg.0
    L_022e: ldfld [Inkie]Inkie.Form1::label3
    L_0233: ldc.i4.s 55
    L_0235: ldc.i4.s 13
    L_0237: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_023c: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_0241: ldarg.0
    L_0242: ldfld [Inkie]Inkie.Form1::label3
    L_0247: ldc.i4.4
    L_0248: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_024d: ldarg.0
    L_024e: ldfld [Inkie]Inkie.Form1::label3
    L_0253: ldstr "47886655"
    L_0258: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_025d: ldarg.0
    L_025e: ldfld [Inkie]Inkie.Form1::label4
    L_0263: ldc.i4.1
    L_0264: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_AutoSize(bool)
    L_0269: ldarg.0
    L_026a: ldfld [Inkie]Inkie.Form1::label4
    L_026f: call valuetype [System.Drawing]System.Drawing.Color [System.Drawing]System.Drawing.SystemColors::get_Control()
    L_0274: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_ForeColor(valuetype [System.Drawing]System.Drawing.Color)
    L_0279: ldarg.0
    L_027a: ldfld [Inkie]Inkie.Form1::label4
    L_027f: ldc.i4.s 12
    L_0281: ldc.i4 191
    L_0286: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_028b: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_0290: ldarg.0
    L_0291: ldfld [Inkie]Inkie.Form1::label4
    L_0296: ldstr "label4"
    L_029b: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_02a0: ldarg.0
    L_02a1: ldfld [Inkie]Inkie.Form1::label4
    L_02a6: ldc.i4.s 53
    L_02a8: ldc.i4.s 13
    L_02aa: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_02af: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_02b4: ldarg.0
    L_02b5: ldfld [Inkie]Inkie.Form1::label4
    L_02ba: ldc.i4.5
    L_02bb: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_02c0: ldarg.0
    L_02c1: ldfld [Inkie]Inkie.Form1::label4
    L_02c6: ldstr "83f05688"
    L_02cb: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_02d0: ldarg.0
    L_02d1: ldfld [Inkie]Inkie.Form1::label5
    L_02d6: ldc.i4.1
    L_02d7: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_AutoSize(bool)
    L_02dc: ldarg.0
    L_02dd: ldfld [Inkie]Inkie.Form1::label5
    L_02e2: call valuetype [System.Drawing]System.Drawing.Color [System.Drawing]System.Drawing.SystemColors::get_Control()
    L_02e7: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_ForeColor(valuetype [System.Drawing]System.Drawing.Color)
    L_02ec: ldarg.0
    L_02ed: ldfld [Inkie]Inkie.Form1::label5
    L_02f2: ldc.i4.s 12
    L_02f4: ldc.i4 204
    L_02f9: newobj instance void [System.Drawing]System.Drawing.Point::.ctor(int32,int32)
    L_02fe: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Location(valuetype [System.Drawing]System.Drawing.Point)
    L_0303: ldarg.0
    L_0304: ldfld [Inkie]Inkie.Form1::label5
    L_0309: ldstr "label5"
    L_030e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_0313: ldarg.0
    L_0314: ldfld [Inkie]Inkie.Form1::label5
    L_0319: ldc.i4.s 54
    L_031b: ldc.i4.s 13
    L_031d: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_0322: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Size(valuetype [System.Drawing]System.Drawing.Size)
    L_0327: ldarg.0
    L_0328: ldfld [Inkie]Inkie.Form1::label5
    L_032d: ldc.i4.6
    L_032e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_TabIndex(int32)
    L_0333: ldarg.0
    L_0334: ldfld [Inkie]Inkie.Form1::label5
    L_0339: ldstr "c154b6ea"
    L_033e: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_0343: ldarg.0
    L_0344: ldc.r4 6
    L_0349: ldc.r4 13
    L_034e: newobj instance void [System.Drawing]System.Drawing.SizeF::.ctor(float32,float32)
    L_0353: call instance void [System.Windows.Forms]System.Windows.Forms.ContainerControl::set_AutoScaleDimensions(valuetype [System.Drawing]System.Drawing.SizeF)
    L_0358: ldarg.0
    L_0359: ldc.i4.1
    L_035a: call instance void [System.Windows.Forms]System.Windows.Forms.ContainerControl::set_AutoScaleMode(valuetype [System.Windows.Forms]System.Windows.Forms.AutoScaleMode)
    L_035f: ldarg.0
    L_0360: ldc.i4 284
    L_0365: ldc.i4 262
    L_036a: newobj instance void [System.Drawing]System.Drawing.Size::.ctor(int32,int32)
    L_036f: call instance void [System.Windows.Forms]System.Windows.Forms.Form::set_ClientSize(valuetype [System.Drawing]System.Drawing.Size)
    L_0374: ldarg.0
    L_0375: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_037a: ldarg.0
    L_037b: ldfld [Inkie]Inkie.Form1::label5
    L_0380: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_0385: ldarg.0
    L_0386: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_038b: ldarg.0
    L_038c: ldfld [Inkie]Inkie.Form1::label4
    L_0391: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_0396: ldarg.0
    L_0397: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_039c: ldarg.0
    L_039d: ldfld [Inkie]Inkie.Form1::label3
    L_03a2: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_03a7: ldarg.0
    L_03a8: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_03ad: ldarg.0
    L_03ae: ldfld [Inkie]Inkie.Form1::label2
    L_03b3: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_03b8: ldarg.0
    L_03b9: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_03be: ldarg.0
    L_03bf: ldfld [Inkie]Inkie.Form1::btnCheck
    L_03c4: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_03c9: ldarg.0
    L_03ca: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_03cf: ldarg.0
    L_03d0: ldfld [Inkie]Inkie.Form1::txtPass
    L_03d5: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_03da: ldarg.0
    L_03db: call instance class [System.Windows.Forms].ControlCollection [System.Windows.Forms]System.Windows.Forms.Control::get_Controls()
    L_03e0: ldarg.0
    L_03e1: ldfld [Inkie]Inkie.Form1::label1
    L_03e6: callvirt instance void [System.Windows.Forms].ControlCollection::Add(class [System.Windows.Forms]System.Windows.Forms.Control)
    L_03eb: ldarg.0
    L_03ec: ldc.i4.1
    L_03ed: call instance void [System.Windows.Forms]System.Windows.Forms.Form::set_FormBorderStyle(valuetype [System.Windows.Forms]System.Windows.Forms.FormBorderStyle)
    L_03f2: ldarg.0
    L_03f3: ldc.i4.0
    L_03f4: call instance void [System.Windows.Forms]System.Windows.Forms.Form::set_MaximizeBox(bool)
    L_03f9: ldarg.0
    L_03fa: ldc.i4.0
    L_03fb: call instance void [System.Windows.Forms]System.Windows.Forms.Form::set_MinimizeBox(bool)
    L_0400: ldarg.0
    L_0401: ldstr "Form1"
    L_0406: call instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Name(string)
    L_040b: ldarg.0
    L_040c: ldstr "Eyes of Sauron"
    L_0411: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_0416: ldarg.0
    L_0417: ldarg.0
    L_0418: ldftn instance void [Inkie]Inkie.Form1::Form1_Load(object,class [mscorlib]System.EventArgs)
    L_041e: newobj instance void [mscorlib]System.EventHandler::.ctor(object,valuetype [mscorlib]System.IntPtr)
    L_0423: call instance void [System.Windows.Forms]System.Windows.Forms.Form::add_Load(class [mscorlib]System.EventHandler)
    L_0428: ldarg.0
    L_0429: ldc.i4.0
    L_042a: call instance void [System.Windows.Forms]System.Windows.Forms.Control::ResumeLayout(bool)
    L_042f: ldarg.0
    L_0430: call instance void [System.Windows.Forms]System.Windows.Forms.Control::PerformLayout()
    L_0435: ret
}


jadi hash nya

label2 = d0248b4e
label3 = 47886655
label4 = 83f05688
label5 = c154b6ea

kita coba buat key nya dari label2, label3, label4, dan label5 jadi key nya = d0248b4e4788665583f05688c154b6ea


kita test dan ternyata fail


kita coba cara ke dua yaitu urutan nya  label5, label4, label3, dan label2 jadi key nya = c154b6ea83f0568847886655d0248b4e

dan hasil nya fail juga


kebetulan gw baru dapat ide  gw gunakan pola kita  key nya dari label2, label3, label4, dan label5 jadi key nya = d0248b4e4788665583f05688c154b6ea ya kan tp kali ini gw balik seperti efek cermin jadi kurang lebih.

semula key nya = d0248b4e4788665583f05688c154b6ea

gw tandai merah ternyata ada sedikit jebakan gw cek di bagian btnCheck_Click(Object,EventArgs) : Void


script nya di bagian btnCheck_Click(Object,EventArgs) : Void

.method private hidebysig instance void btnCheck_Click(object sender, class [mscorlib]System.EventArgs e) cil managed
{
    // Method Start RVA 0x2124
    // Code Size 43 (0x2b)
    .maxstack 8
    L_0000: ldarg.0
    L_0001: ldfld [Inkie]Inkie.Form1::label3
    L_0006: ldstr "47996655"
    L_000b: callvirt instance void [System.Windows.Forms]System.Windows.Forms.Control::set_Text(string)
    L_0010: ldarg.0
    L_0011: call instance bool [Inkie]Inkie.Form1::ShallHePass()
    L_0016: brtrue.s L_001f
    L_0018: ldstr "you shall not pass"
    L_001d: br.s L_0024
    L_001f: ldstr "you shall pass"
    L_0024: call valuetype [System.Windows.Forms]System.Windows.Forms.DialogResult [System.Windows.Forms]System.Windows.Forms.MessageBox::Show(string)
    L_0029: pop
    L_002a: ret
}

semula key nya = d0248b4e4788665583f05688c154b6ea
dibalik pake efek cermin istilah nya diubah menjadi key nya ae6b451c98650f3855668874e4b8420d

karena gw liat ada bagian angka yang mirip tapi beda 2 digit di btnCheck_Click(Object,EventArgs) : Void jadi key nya gw ubah menjadi dari 47886655 menjadi 47889955 jika dibalik pake efek cermin menjadi 55669974 dan jadi key nya = ae6b451c98650f3855669974e4b8420d

dan kita coba ternyata berhasil


 flag nya adalah ae6b451c98650f3855669974e4b8420d


dan berhasil


oke cukup sampai disini write up kali ini gw akan bikin write up CTF yang lainnya karena gw beberapa event CTF juga gw ikutin kalo ada challenge nya yang berhasil gw selesaikan pasti gw bikin write up nya buat dokumentasi dan bukti nya.

TOLONG JANGAN BULLY KAMI TERUS KAMI BUKAN SIAPA-SIAPA WKWKWKWKWKWKWK

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