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rule win_hellokitty_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.hellokitty." 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.hellokitty" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 89b898000000 8bcf 334df0 894de8 89889c000000 0fb6c9 0fb689303b4200 } // n = 7, score = 100 // 89b898000000 | mov dword ptr [eax + 0x98], edi // 8bcf | mov ecx, edi // 334df0 | xor ecx, dword ptr [ebp - 0x10] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 89889c000000 | mov dword ptr [eax + 0x9c], ecx // 0fb6c9 | movzx ecx, cl // 0fb689303b4200 | movzx ecx, byte ptr [ecx + 0x423b30] $sequence_1 = { 33c8 03ca 8b55f8 03f1 8bc2 c1c007 8bca } // n = 7, score = 100 // 33c8 | xor ecx, eax // 03ca | add ecx, edx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 03f1 | add esi, ecx // 8bc2 | mov eax, edx // c1c007 | rol eax, 7 // 8bca | mov ecx, edx $sequence_2 = { 0f849b000000 391d???????? 0f848f000000 391d???????? 0f8483000000 6a42 8d45a8 } // n = 7, score = 100 // 0f849b000000 | je 0xa1 // 391d???????? | // 0f848f000000 | je 0x95 // 391d???????? | // 0f8483000000 | je 0x89 // 6a42 | push 0x42 // 8d45a8 | lea eax, [ebp - 0x58] $sequence_3 = { 75ed 8b7510 8b5518 33ff 663bce 7324 } // n = 6, score = 100 // 75ed | jne 0xffffffef // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 8b5518 | mov edx, dword ptr [ebp + 0x18] // 33ff | xor edi, edi // 663bce | cmp cx, si // 7324 | jae 0x26 $sequence_4 = { 8945e4 33da 8b45a8 3345fc 8b55ac 33c2 335dc4 } // n = 7, score = 100 // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 33da | xor ebx, edx // 8b45a8 | mov eax, dword ptr [ebp - 0x58] // 3345fc | xor eax, dword ptr [ebp - 4] // 8b55ac | mov edx, dword ptr [ebp - 0x54] // 33c2 | xor eax, edx // 335dc4 | xor ebx, dword ptr [ebp - 0x3c] $sequence_5 = { 8975cc c1c90b 8bd6 0355b0 33c8 8bc3 8955cc } // n = 7, score = 100 // 8975cc | mov dword ptr [ebp - 0x34], esi // c1c90b | ror ecx, 0xb // 8bd6 | mov edx, esi // 0355b0 | add edx, dword ptr [ebp - 0x50] // 33c8 | xor ecx, eax // 8bc3 | mov eax, ebx // 8955cc | mov dword ptr [ebp - 0x34], edx $sequence_6 = { 33c9 8b75dc 33ff 895dfc 41 8b45d8 2bf0 } // n = 7, score = 100 // 33c9 | xor ecx, ecx // 8b75dc | mov esi, dword ptr [ebp - 0x24] // 33ff | xor edi, edi // 895dfc | mov dword ptr [ebp - 4], ebx // 41 | inc ecx // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 2bf0 | sub esi, eax $sequence_7 = { 50 68???????? 51 51 ff15???????? 8945fc 8bcf } // n = 7, score = 100 // 50 | push eax // 68???????? | // 51 | push ecx // 51 | push ecx // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 8bcf | mov ecx, edi $sequence_8 = { 83c404 85db 7512 0f1045d4 83c710 0f1106 } // n = 6, score = 100 // 83c404 | add esp, 4 // 85db | test ebx, ebx // 7512 | jne 0x14 // 0f1045d4 | movups xmm0, xmmword ptr [ebp - 0x2c] // 83c710 | add edi, 0x10 // 0f1106 | movups xmmword ptr [esi], xmm0 $sequence_9 = { 8b049d20364200 0fb6440828 83e001 7469 56 e8???????? 59 } // n = 7, score = 100 // 8b049d20364200 | mov eax, dword ptr [ebx*4 + 0x423620] // 0fb6440828 | movzx eax, byte ptr [eax + ecx + 0x28] // 83e001 | and eax, 1 // 7469 | je 0x6b // 56 | push esi // e8???????? | // 59 | pop ecx condition: 7 of them and filesize < 319488 }
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