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rule win_mokes_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { f20f59c1 f20f58e0 f20f104708 f20f59c2 f20f11642440 f20f58f0 f20f106710 } // n = 7, score = 400 // f20f59c1 | mulsd xmm0, xmm1 // f20f58e0 | addsd xmm4, xmm0 // f20f104708 | movsd xmm0, qword ptr [edi + 8] // f20f59c2 | mulsd xmm0, xmm2 // f20f11642440 | movsd qword ptr [esp + 0x40], xmm4 // f20f58f0 | addsd xmm6, xmm0 // f20f106710 | movsd xmm4, qword ptr [edi + 0x10] $sequence_1 = { e8???????? 8b44241c 894604 eb09 6aff 8bcb e8???????? } // n = 7, score = 400 // e8???????? | // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 894604 | mov dword ptr [esi + 4], eax // eb09 | jmp 0xb // 6aff | push -1 // 8bcb | mov ecx, ebx // e8???????? | $sequence_2 = { f20f105c2424 c7430400000000 8b4d08 83caff 83f91d 7c05 83f928 } // n = 7, score = 400 // f20f105c2424 | movsd xmm3, qword ptr [esp + 0x24] // c7430400000000 | mov dword ptr [ebx + 4], 0 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 83caff | or edx, 0xffffffff // 83f91d | cmp ecx, 0x1d // 7c05 | jl 7 // 83f928 | cmp ecx, 0x28 $sequence_3 = { ff9080000000 b001 5f 5e 5b 8be5 5d } // n = 7, score = 400 // ff9080000000 | call dword ptr [eax + 0x80] // b001 | mov al, 1 // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_4 = { ff7604 03c6 50 e8???????? 8b7764 833e00 7561 } // n = 7, score = 400 // ff7604 | push dword ptr [esi + 4] // 03c6 | add eax, esi // 50 | push eax // e8???????? | // 8b7764 | mov esi, dword ptr [edi + 0x64] // 833e00 | cmp dword ptr [esi], 0 // 7561 | jne 0x63 $sequence_5 = { ff750c 8d442414 50 e8???????? 8b742410 8b460c 3b4608 } // n = 7, score = 400 // ff750c | push dword ptr [ebp + 0xc] // 8d442414 | lea eax, [esp + 0x14] // 50 | push eax // e8???????? | // 8b742410 | mov esi, dword ptr [esp + 0x10] // 8b460c | mov eax, dword ptr [esi + 0xc] // 3b4608 | cmp eax, dword ptr [esi + 8] $sequence_6 = { 8d44240c 50 57 8bce e8???????? 8b0e 8b10 } // n = 7, score = 400 // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax // 57 | push edi // 8bce | mov ecx, esi // e8???????? | // 8b0e | mov ecx, dword ptr [esi] // 8b10 | mov edx, dword ptr [eax] $sequence_7 = { e8???????? 83c404 84c0 7409 b001 5f 5e } // n = 7, score = 400 // e8???????? | // 83c404 | add esp, 4 // 84c0 | test al, al // 7409 | je 0xb // b001 | mov al, 1 // 5f | pop edi // 5e | pop esi $sequence_8 = { ba05000000 b9???????? e8???????? 8bf0 ba0a000000 b9???????? 8974240c } // n = 7, score = 400 // ba05000000 | mov edx, 5 // b9???????? | // e8???????? | // 8bf0 | mov esi, eax // ba0a000000 | mov edx, 0xa // b9???????? | // 8974240c | mov dword ptr [esp + 0xc], esi $sequence_9 = { e8???????? 8bf0 83caff 85ed 7577 8b0d???????? 85c9 } // n = 7, score = 400 // e8???????? | // 8bf0 | mov esi, eax // 83caff | or edx, 0xffffffff // 85ed | test ebp, ebp // 7577 | jne 0x79 // 8b0d???????? | // 85c9 | test ecx, ecx condition: 7 of them and filesize < 18505728 }
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