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rule win_mokes_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.mokes." 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.mokes" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { f20f58d8 f20f10442418 f20f594628 f20f58f4 f20f585f20 f20f11442418 f20f104708 } // n = 7, score = 400 // f20f58d8 | addsd xmm3, xmm0 // f20f10442418 | movsd xmm0, qword ptr [esp + 0x18] // f20f594628 | mulsd xmm0, qword ptr [esi + 0x28] // f20f58f4 | addsd xmm6, xmm4 // f20f585f20 | addsd xmm3, qword ptr [edi + 0x20] // f20f11442418 | movsd qword ptr [esp + 0x18], xmm0 // f20f104708 | movsd xmm0, qword ptr [edi + 8] $sequence_1 = { f20f58f8 f20f104618 f20f59c5 f20f59fd f20f58c1 f20f59c4 f20f58c2 } // n = 7, score = 400 // f20f58f8 | addsd xmm7, xmm0 // f20f104618 | movsd xmm0, qword ptr [esi + 0x18] // f20f59c5 | mulsd xmm0, xmm5 // f20f59fd | mulsd xmm7, xmm5 // f20f58c1 | addsd xmm0, xmm1 // f20f59c4 | mulsd xmm0, xmm4 // f20f58c2 | addsd xmm0, xmm2 $sequence_2 = { f20f114c2410 660f2fd0 8d0c24 f20f11442408 0f46c8 8d442410 f20f1001 } // n = 7, score = 400 // f20f114c2410 | movsd qword ptr [esp + 0x10], xmm1 // 660f2fd0 | comisd xmm2, xmm0 // 8d0c24 | lea ecx, [esp] // f20f11442408 | movsd qword ptr [esp + 8], xmm0 // 0f46c8 | cmovbe ecx, eax // 8d442410 | lea eax, [esp + 0x10] // f20f1001 | movsd xmm0, qword ptr [ecx] $sequence_3 = { ff742424 8d442438 50 f30f7f44243c e8???????? ff442428 89442420 } // n = 7, score = 400 // ff742424 | push dword ptr [esp + 0x24] // 8d442438 | lea eax, [esp + 0x38] // 50 | push eax // f30f7f44243c | movdqu xmmword ptr [esp + 0x3c], xmm0 // e8???????? | // ff442428 | inc dword ptr [esp + 0x28] // 89442420 | mov dword ptr [esp + 0x20], eax $sequence_4 = { f30f7f06 c7461000000000 ff4304 85c9 7405 8b470c 8901 } // n = 7, score = 400 // f30f7f06 | movdqu xmmword ptr [esi], xmm0 // c7461000000000 | mov dword ptr [esi + 0x10], 0 // ff4304 | inc dword ptr [ebx + 4] // 85c9 | test ecx, ecx // 7405 | je 7 // 8b470c | mov eax, dword ptr [edi + 0xc] // 8901 | mov dword ptr [ecx], eax $sequence_5 = { ffd3 8b4508 8bc8 81e177770000 7412 50 8bd6 } // n = 7, score = 400 // ffd3 | call ebx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8bc8 | mov ecx, eax // 81e177770000 | and ecx, 0x7777 // 7412 | je 0x14 // 50 | push eax // 8bd6 | mov edx, esi $sequence_6 = { f30f1144241c 8b4510 f20f104c2418 8b4904 f20f1000 f20f105008 83791000 } // n = 7, score = 400 // f30f1144241c | movss dword ptr [esp + 0x1c], xmm0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // f20f104c2418 | movsd xmm1, qword ptr [esp + 0x18] // 8b4904 | mov ecx, dword ptr [ecx + 4] // f20f1000 | movsd xmm0, qword ptr [eax] // f20f105008 | movsd xmm2, qword ptr [eax + 8] // 83791000 | cmp dword ptr [ecx + 0x10], 0 $sequence_7 = { e8???????? 8d4c2430 c68424840000000a 51 8d4c2428 51 8bc8 } // n = 7, score = 400 // e8???????? | // 8d4c2430 | lea ecx, [esp + 0x30] // c68424840000000a | mov byte ptr [esp + 0x84], 0xa // 51 | push ecx // 8d4c2428 | lea ecx, [esp + 0x28] // 51 | push ecx // 8bc8 | mov ecx, eax $sequence_8 = { ff712c ff7108 8b4924 52 83ec08 8ad3 e8???????? } // n = 7, score = 400 // ff712c | push dword ptr [ecx + 0x2c] // ff7108 | push dword ptr [ecx + 8] // 8b4924 | mov ecx, dword ptr [ecx + 0x24] // 52 | push edx // 83ec08 | sub esp, 8 // 8ad3 | mov dl, bl // e8???????? | $sequence_9 = { f30f7f842494000000 8b11 ff7060 8d842498000000 50 8d44244c 50 } // n = 7, score = 400 // f30f7f842494000000 | movdqu xmmword ptr [esp + 0x94], xmm0 // 8b11 | mov edx, dword ptr [ecx] // ff7060 | push dword ptr [eax + 0x60] // 8d842498000000 | lea eax, [esp + 0x98] // 50 | push eax // 8d44244c | lea eax, [esp + 0x4c] // 50 | push eax condition: 7 of them and filesize < 18505728 }
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