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rule win_mykings_spreader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.mykings_spreader." 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.mykings_spreader" 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 = { aa 0000 00e9 15ffffffa5 66750d 5c a4 } // n = 7, score = 100 // aa | stosb byte ptr es:[edi], al // 0000 | add byte ptr [eax], al // 00e9 | add cl, ch // 15ffffffa5 | adc eax, 0xa5ffffff // 66750d | jne 0x10 // 5c | pop esp // a4 | movsb byte ptr es:[edi], byte ptr [esi] $sequence_1 = { 8b45fc 8b00 8b40f0 8a4402ff 3c2a 0f85d2000000 8b45fc } // n = 7, score = 100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b00 | mov eax, dword ptr [eax] // 8b40f0 | mov eax, dword ptr [eax - 0x10] // 8a4402ff | mov al, byte ptr [edx + eax - 1] // 3c2a | cmp al, 0x2a // 0f85d2000000 | jne 0xd8 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_2 = { 50 85c0 0f85dc000000 8b5df8 89d8 e8???????? c70300000000 } // n = 7, score = 100 // 50 | push eax // 85c0 | test eax, eax // 0f85dc000000 | jne 0xe2 // 8b5df8 | mov ebx, dword ptr [ebp - 8] // 89d8 | mov eax, ebx // e8???????? | // c70300000000 | mov dword ptr [ebx], 0 $sequence_3 = { 89c2 52 ff35???????? 6a00 ff35???????? e8???????? 6a01 } // n = 7, score = 100 // 89c2 | mov edx, eax // 52 | push edx // ff35???????? | // 6a00 | push 0 // ff35???????? | // e8???????? | // 6a01 | push 1 $sequence_4 = { 7503 895dfc 89d8 39f0 7ca4 8b45fc 48 } // n = 7, score = 100 // 7503 | jne 5 // 895dfc | mov dword ptr [ebp - 4], ebx // 89d8 | mov eax, ebx // 39f0 | cmp eax, esi // 7ca4 | jl 0xffffffa6 // 8b45fc | mov eax, dword ptr [ebp - 4] // 48 | dec eax $sequence_5 = { 8d85e0fdffff e8???????? 8b95e0fdffff 89d8 8b0b ff5174 8d9550ffffff } // n = 7, score = 100 // 8d85e0fdffff | lea eax, [ebp - 0x220] // e8???????? | // 8b95e0fdffff | mov edx, dword ptr [ebp - 0x220] // 89d8 | mov eax, ebx // 8b0b | mov ecx, dword ptr [ebx] // ff5174 | call dword ptr [ecx + 0x74] // 8d9550ffffff | lea edx, [ebp - 0xb0] $sequence_6 = { 8b542404 8b4210 29c1 89cf 89f8 3b0424 7e03 } // n = 7, score = 100 // 8b542404 | mov edx, dword ptr [esp + 4] // 8b4210 | mov eax, dword ptr [edx + 0x10] // 29c1 | sub ecx, eax // 89cf | mov edi, ecx // 89f8 | mov eax, edi // 3b0424 | cmp eax, dword ptr [esp] // 7e03 | jle 5 $sequence_7 = { 89c3 8b03 85c0 7410 832b08 8b03 e8???????? } // n = 7, score = 100 // 89c3 | mov ebx, eax // 8b03 | mov eax, dword ptr [ebx] // 85c0 | test eax, eax // 7410 | je 0x12 // 832b08 | sub dword ptr [ebx], 8 // 8b03 | mov eax, dword ptr [ebx] // e8???????? | $sequence_8 = { 68???????? 55 aa e8???????? 8bf0 83c408 85f6 } // n = 7, score = 100 // 68???????? | // 55 | push ebp // aa | stosb byte ptr es:[edi], al // e8???????? | // 8bf0 | mov esi, eax // 83c408 | add esp, 8 // 85f6 | test esi, esi $sequence_9 = { 4a 8d7600 42 0fb60c13 0fa30d???????? 7304 c604135c } // n = 7, score = 100 // 4a | dec edx // 8d7600 | lea esi, [esi] // 42 | inc edx // 0fb60c13 | movzx ecx, byte ptr [ebx + edx] // 0fa30d???????? | // 7304 | jae 6 // c604135c | mov byte ptr [ebx + edx], 0x5c condition: 7 of them and filesize < 1581056 }
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