Actor(s): Pirate Panda
There is no description at this point.
rule win_keyboy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" version = "1" description = "Detects win.keyboy." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.keyboy" malpedia_rule_date = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 6a00 8945f2 8d45f8 50 6a0e } // n = 5, score = 600 // 6a00 | push 0 // 8945f2 | mov dword ptr [ebp - 0xe], eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 6a0e | push 0xe $sequence_1 = { 51 ff75d8 6a00 ff75c0 } // n = 4, score = 600 // 51 | push ecx // ff75d8 | push dword ptr [ebp - 0x28] // 6a00 | push 0 // ff75c0 | push dword ptr [ebp - 0x40] $sequence_2 = { c705????????3abf261f c705????????890e9944 c705????????dbd99823 c705????????d468bcb5 c705????????2086e659 } // n = 5, score = 500 // c705????????3abf261f | // c705????????890e9944 | // c705????????dbd99823 | // c705????????d468bcb5 | // c705????????2086e659 | $sequence_3 = { c705????????d468bcb5 c705????????2086e659 c705????????eec45abf c705????????bbee2bd1 } // n = 4, score = 500 // c705????????d468bcb5 | // c705????????2086e659 | // c705????????eec45abf | // c705????????bbee2bd1 | $sequence_4 = { c705????????d87f958c c705????????0caa6c89 c705????????a856701f c705????????597e743c c705????????0a9769e0 c705????????c4b85363 c705????????3abf261f } // n = 7, score = 500 // c705????????d87f958c | // c705????????0caa6c89 | // c705????????a856701f | // c705????????597e743c | // c705????????0a9769e0 | // c705????????c4b85363 | // c705????????3abf261f | $sequence_5 = { c3 3b0d???????? f27502 f2c3 f2e953030000 55 8bec } // n = 7, score = 500 // c3 | ret // 3b0d???????? | // f27502 | bnd jne 5 // f2c3 | bnd ret // f2e953030000 | bnd jmp 0x359 // 55 | push ebp // 8bec | mov ebp, esp $sequence_6 = { 8b85d0fdffff 83c008 50 ff33 ff15???????? 85c0 } // n = 6, score = 400 // 8b85d0fdffff | mov eax, dword ptr [ebp - 0x230] // 83c008 | add eax, 8 // 50 | push eax // ff33 | push dword ptr [ebx] // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { 8bf2 c745f470646174 66c745f86500 8a02 42 84c0 } // n = 6, score = 400 // 8bf2 | mov esi, edx // c745f470646174 | mov dword ptr [ebp - 0xc], 0x74616470 // 66c745f86500 | mov word ptr [ebp - 8], 0x65 // 8a02 | mov al, byte ptr [edx] // 42 | inc edx // 84c0 | test al, al $sequence_8 = { 7207 b901000000 eb0f 3cfe 7509 } // n = 5, score = 400 // 7207 | jb 9 // b901000000 | mov ecx, 1 // eb0f | jmp 0x11 // 3cfe | cmp al, 0xfe // 7509 | jne 0xb $sequence_9 = { ffd0 e9???????? bbfeffffff eb05 } // n = 4, score = 400 // ffd0 | call eax // e9???????? | // bbfeffffff | mov ebx, 0xfffffffe // eb05 | jmp 7 $sequence_10 = { 6683f809 740a 6683f806 7404 32c9 eb02 } // n = 6, score = 400 // 6683f809 | cmp ax, 9 // 740a | je 0xc // 6683f806 | cmp ax, 6 // 7404 | je 6 // 32c9 | xor cl, cl // eb02 | jmp 4 $sequence_11 = { 2408 f6d8 1ac0 24dd 88474e e8???????? } // n = 6, score = 400 // 2408 | and al, 8 // f6d8 | neg al // 1ac0 | sbb al, al // 24dd | and al, 0xdd // 88474e | mov byte ptr [edi + 0x4e], al // e8???????? | $sequence_12 = { 24a0 3ca0 7518 b800080000 } // n = 4, score = 400 // 24a0 | and al, 0xa0 // 3ca0 | cmp al, 0xa0 // 7518 | jne 0x1a // b800080000 | mov eax, 0x800 $sequence_13 = { 84c0 75f0 8d55ec c745ec5c417070 } // n = 4, score = 400 // 84c0 | test al, al // 75f0 | jne 0xfffffff2 // 8d55ec | lea edx, [ebp - 0x14] // c745ec5c417070 | mov dword ptr [ebp - 0x14], 0x7070415c $sequence_14 = { 8bce 81e107000080 7905 49 83c9f8 41 8a043e } // n = 7, score = 400 // 8bce | mov ecx, esi // 81e107000080 | and ecx, 0x80000007 // 7905 | jns 7 // 49 | dec ecx // 83c9f8 | or ecx, 0xfffffff8 // 41 | inc ecx // 8a043e | mov al, byte ptr [esi + edi] $sequence_15 = { c745c441647661 8d45c4 c745c870693332 50 c645cc00 ff15???????? 8b15???????? } // n = 7, score = 400 // c745c441647661 | mov dword ptr [ebp - 0x3c], 0x61766441 // 8d45c4 | lea eax, [ebp - 0x3c] // c745c870693332 | mov dword ptr [ebp - 0x38], 0x32336970 // 50 | push eax // c645cc00 | mov byte ptr [ebp - 0x34], 0 // ff15???????? | // 8b15???????? | $sequence_16 = { f7d9 85db 0f44c2 23c8 } // n = 4, score = 400 // f7d9 | neg ecx // 85db | test ebx, ebx // 0f44c2 | cmove eax, edx // 23c8 | and ecx, eax $sequence_17 = { 3401 0fbec0 0fafc8 80f185 880c3e 46 3bf2 } // n = 7, score = 400 // 3401 | xor al, 1 // 0fbec0 | movsx eax, al // 0fafc8 | imul ecx, eax // 80f185 | xor cl, 0x85 // 880c3e | mov byte ptr [esi + edi], cl // 46 | inc esi // 3bf2 | cmp esi, edx $sequence_18 = { e8???????? 85c0 755e 83ff20 } // n = 4, score = 400 // e8???????? | // 85c0 | test eax, eax // 755e | jne 0x60 // 83ff20 | cmp edi, 0x20 $sequence_19 = { 8d46d6 99 83e23f 03c2 } // n = 4, score = 400 // 8d46d6 | lea eax, [esi - 0x2a] // 99 | cdq // 83e23f | and edx, 0x3f // 03c2 | add eax, edx $sequence_20 = { ffd0 8bf0 c745dc5368656c 8d45dc c745e06c333200 } // n = 5, score = 400 // ffd0 | call eax // 8bf0 | mov esi, eax // c745dc5368656c | mov dword ptr [ebp - 0x24], 0x6c656853 // 8d45dc | lea eax, [ebp - 0x24] // c745e06c333200 | mov dword ptr [ebp - 0x20], 0x32336c $sequence_21 = { 8d852cfdffff 8bf2 6a00 50 89b528fdffff 8bd9 e8???????? } // n = 7, score = 400 // 8d852cfdffff | lea eax, [ebp - 0x2d4] // 8bf2 | mov esi, edx // 6a00 | push 0 // 50 | push eax // 89b528fdffff | mov dword ptr [ebp - 0x2d8], esi // 8bd9 | mov ebx, ecx // e8???????? | condition: 7 of them and filesize < 2170880 }
import "pe" rule win_keyboy_w0 { meta: author = "Florian Roth" reference = "http://www.pwc.co.uk/issues/cyber-security-data-privacy/research/the-keyboys-are-back-in-town.html" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.keyboy" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "reg add HKLM\\%s\\Parameters /v ServiceDll /t REG_EXPAND_SZ /d \"%s\" /f" fullword ascii $x3 = "Internet using \\svchost.exe -k -n 3" fullword ascii $x4 = "reg add \"HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\" /v SFCDisable /t REG_DWORD /d 4 /f" fullword ascii $s1 = "sc create %s binpath= \"%s\" Type= share Start= auto DisplayName= \"%s\"" fullword ascii $s2 = "ExecCmd:%s" fullword ascii $s3 = "szCommand : %s" fullword ascii $s4 = "Current user is a member of the %s\\%s group" fullword ascii $s5 = "icacls %s /grant administrators:F" fullword ascii $s6 = "Ping 127.0.0.1 goto Repeat" fullword ascii $s7 = "Start MoveFile %s -> %s" fullword ascii $s8 = "move %s\\dllcache%s %s\\dllcache\\%s" fullword ascii $s9 = "%s\\cmd.exe /c \"%s\"" fullword ascii condition: pe.imphash() == "68f7eced34c46808756db4b0c45fb589" or ( pe.exports("Insys") and pe.exports("Inuser") and pe.exports("SSSS") ) or 1 of ($x*) or 4 of them }
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