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rule win_beepservice_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.beepservice." 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.beepservice" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b0d???????? 68???????? ffd6 8bc8 } // n = 4, score = 600 // 8b0d???????? | // 68???????? | // ffd6 | call esi // 8bc8 | mov ecx, eax $sequence_1 = { ffd6 8bc8 ff15???????? 50 ff15???????? } // n = 5, score = 600 // ffd6 | call esi // 8bc8 | mov ecx, eax // ff15???????? | // 50 | push eax // ff15???????? | $sequence_2 = { 83f801 7505 e8???????? 68???????? 68???????? } // n = 5, score = 500 // 83f801 | cmp eax, 1 // 7505 | jne 7 // e8???????? | // 68???????? | // 68???????? | $sequence_3 = { 83c408 e9???????? 68???????? e8???????? 83c404 6a00 6a00 } // n = 7, score = 500 // 83c408 | add esp, 8 // e9???????? | // 68???????? | // e8???????? | // 83c404 | add esp, 4 // 6a00 | push 0 // 6a00 | push 0 $sequence_4 = { 7512 6888130000 68???????? e8???????? } // n = 4, score = 500 // 7512 | jne 0x14 // 6888130000 | push 0x1388 // 68???????? | // e8???????? | $sequence_5 = { 683f000f00 6a00 68???????? ff15???????? } // n = 4, score = 500 // 683f000f00 | push 0xf003f // 6a00 | push 0 // 68???????? | // ff15???????? | $sequence_6 = { ff15???????? 50 68???????? e8???????? 83c408 e9???????? 68???????? } // n = 7, score = 500 // ff15???????? | // 50 | push eax // 68???????? | // e8???????? | // 83c408 | add esp, 8 // e9???????? | // 68???????? | $sequence_7 = { e8???????? 6a02 bd???????? 57 55 e8???????? } // n = 6, score = 400 // e8???????? | // 6a02 | push 2 // bd???????? | // 57 | push edi // 55 | push ebp // e8???????? | $sequence_8 = { 730f ff7618 68???????? e8???????? 59 59 } // n = 6, score = 400 // 730f | jae 0x11 // ff7618 | push dword ptr [esi + 0x18] // 68???????? | // e8???????? | // 59 | pop ecx // 59 | pop ecx $sequence_9 = { 56 6800000040 50 ff15???????? 8bf8 83ffff 750e } // n = 7, score = 400 // 56 | push esi // 6800000040 | push 0x40000000 // 50 | push eax // ff15???????? | // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 750e | jne 0x10 $sequence_10 = { 83c410 33f6 8d85fcfdffff 56 56 6a02 56 } // n = 7, score = 400 // 83c410 | add esp, 0x10 // 33f6 | xor esi, esi // 8d85fcfdffff | lea eax, [ebp - 0x204] // 56 | push esi // 56 | push esi // 6a02 | push 2 // 56 | push esi $sequence_11 = { e8???????? 59 59 53 ffd7 56 } // n = 6, score = 400 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 53 | push ebx // ffd7 | call edi // 56 | push esi $sequence_12 = { 8bb42410020000 ff7618 e8???????? 83f820 59 } // n = 5, score = 400 // 8bb42410020000 | mov esi, dword ptr [esp + 0x210] // ff7618 | push dword ptr [esi + 0x18] // e8???????? | // 83f820 | cmp eax, 0x20 // 59 | pop ecx $sequence_13 = { 5e 81c404020000 c3 8d542404 } // n = 4, score = 300 // 5e | pop esi // 81c404020000 | add esp, 0x204 // c3 | ret // 8d542404 | lea edx, [esp + 4] $sequence_14 = { 53 ff15???????? 8bf0 85f6 7519 ff15???????? 50 } // n = 7, score = 300 // 53 | push ebx // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7519 | jne 0x1b // ff15???????? | // 50 | push eax $sequence_15 = { 68???????? e8???????? 83c408 8b3d???????? 8b1d???????? 55 33ed } // n = 7, score = 300 // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 8b3d???????? | // 8b1d???????? | // 55 | push ebp // 33ed | xor ebp, ebp $sequence_16 = { 83f81e 720a b801000000 e9???????? 8b450c 8b480c 51 } // n = 7, score = 200 // 83f81e | cmp eax, 0x1e // 720a | jb 0xc // b801000000 | mov eax, 1 // e9???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b480c | mov ecx, dword ptr [eax + 0xc] // 51 | push ecx $sequence_17 = { 7316 8b4d0c 8b5104 52 68???????? } // n = 5, score = 200 // 7316 | jae 0x18 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8b5104 | mov edx, dword ptr [ecx + 4] // 52 | push edx // 68???????? | $sequence_18 = { 83c404 83f826 720a b801000000 } // n = 4, score = 200 // 83c404 | add esp, 4 // 83f826 | cmp eax, 0x26 // 720a | jb 0xc // b801000000 | mov eax, 1 $sequence_19 = { 51 ff15???????? 668bf0 68???????? 81f699990000 ff15???????? } // n = 6, score = 100 // 51 | push ecx // ff15???????? | // 668bf0 | mov si, ax // 68???????? | // 81f699990000 | xor esi, 0x9999 // ff15???????? | $sequence_20 = { 56 57 33f6 8975d8 8975e0 8975e4 8975dc } // n = 7, score = 100 // 56 | push esi // 57 | push edi // 33f6 | xor esi, esi // 8975d8 | mov dword ptr [ebp - 0x28], esi // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8975e4 | mov dword ptr [ebp - 0x1c], esi // 8975dc | mov dword ptr [ebp - 0x24], esi $sequence_21 = { 7e15 b299 8a9874304000 32da 889874304000 40 } // n = 6, score = 100 // 7e15 | jle 0x17 // b299 | mov dl, 0x99 // 8a9874304000 | mov bl, byte ptr [eax + 0x403074] // 32da | xor bl, dl // 889874304000 | mov byte ptr [eax + 0x403074], bl // 40 | inc eax $sequence_22 = { 5f 5e 85c0 a3???????? 5b 7507 81c494010000 } // n = 7, score = 100 // 5f | pop edi // 5e | pop esi // 85c0 | test eax, eax // a3???????? | // 5b | pop ebx // 7507 | jne 9 // 81c494010000 | add esp, 0x194 $sequence_23 = { 57 ff15???????? 8945e4 85c0 7407 } // n = 5, score = 100 // 57 | push edi // ff15???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 85c0 | test eax, eax // 7407 | je 9 $sequence_24 = { 50 e8???????? 83c404 c3 6a00 6a00 6a01 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // c3 | ret // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 $sequence_25 = { a1???????? 85c0 741f 68e8030000 6a01 6a00 } // n = 6, score = 100 // a1???????? | // 85c0 | test eax, eax // 741f | je 0x21 // 68e8030000 | push 0x3e8 // 6a01 | push 1 // 6a00 | push 0 $sequence_26 = { 8a8228304000 3c39 7f04 3c30 7d02 } // n = 5, score = 100 // 8a8228304000 | mov al, byte ptr [edx + 0x403028] // 3c39 | cmp al, 0x39 // 7f04 | jg 6 // 3c30 | cmp al, 0x30 // 7d02 | jge 4 condition: 7 of them and filesize < 253952 }
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