Actor(s): Turla
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rule win_crutch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.crutch." 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.crutch" 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 = { 3bd8 7233 8b9638020000 51 52 68???????? 56 } // n = 7, score = 100 // 3bd8 | cmp ebx, eax // 7233 | jb 0x35 // 8b9638020000 | mov edx, dword ptr [esi + 0x238] // 51 | push ecx // 52 | push edx // 68???????? | // 56 | push esi $sequence_1 = { e9???????? 8b4708 83f807 0f873a010000 ff248550810310 80fb20 0f842a010000 } // n = 7, score = 100 // e9???????? | // 8b4708 | mov eax, dword ptr [edi + 8] // 83f807 | cmp eax, 7 // 0f873a010000 | ja 0x140 // ff248550810310 | jmp dword ptr [eax*4 + 0x10038150] // 80fb20 | cmp bl, 0x20 // 0f842a010000 | je 0x130 $sequence_2 = { 50 e8???????? 83c40c 8d4601 8bce 50 e8???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8d4601 | lea eax, [esi + 1] // 8bce | mov ecx, esi // 50 | push eax // e8???????? | $sequence_3 = { 51 e8???????? 83c404 85c0 741d 4f 83ed01 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 741d | je 0x1f // 4f | dec edi // 83ed01 | sub ebp, 1 $sequence_4 = { 8b4524 83f802 7e07 83f811 7d02 8929 833b00 } // n = 7, score = 100 // 8b4524 | mov eax, dword ptr [ebp + 0x24] // 83f802 | cmp eax, 2 // 7e07 | jle 9 // 83f811 | cmp eax, 0x11 // 7d02 | jge 4 // 8929 | mov dword ptr [ecx], ebp // 833b00 | cmp dword ptr [ebx], 0 $sequence_5 = { 8b542418 8b44241c 898e78070000 8b4c2420 89967c070000 898680070000 898e84070000 } // n = 7, score = 100 // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 898e78070000 | mov dword ptr [esi + 0x778], ecx // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 89967c070000 | mov dword ptr [esi + 0x77c], edx // 898680070000 | mov dword ptr [esi + 0x780], eax // 898e84070000 | mov dword ptr [esi + 0x784], ecx $sequence_6 = { 7212 6a09 53 57 55 e8???????? 83c410 } // n = 7, score = 100 // 7212 | jb 0x14 // 6a09 | push 9 // 53 | push ebx // 57 | push edi // 55 | push ebp // e8???????? | // 83c410 | add esp, 0x10 $sequence_7 = { 741a 85c9 0f8cb9010000 7f08 85c0 0f86af010000 } // n = 6, score = 100 // 741a | je 0x1c // 85c9 | test ecx, ecx // 0f8cb9010000 | jl 0x1bf // 7f08 | jg 0xa // 85c0 | test eax, eax // 0f86af010000 | jbe 0x1b5 $sequence_8 = { 899ed4000000 899ef8000000 899ed8000000 8b9798000000 52 ff15???????? 8b87ac000000 } // n = 7, score = 100 // 899ed4000000 | mov dword ptr [esi + 0xd4], ebx // 899ef8000000 | mov dword ptr [esi + 0xf8], ebx // 899ed8000000 | mov dword ptr [esi + 0xd8], ebx // 8b9798000000 | mov edx, dword ptr [edi + 0x98] // 52 | push edx // ff15???????? | // 8b87ac000000 | mov eax, dword ptr [edi + 0xac] $sequence_9 = { 8945f0 8845c8 660f1345d0 660f1345d8 8945e0 8945e4 8945e8 } // n = 7, score = 100 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8845c8 | mov byte ptr [ebp - 0x38], al // 660f1345d0 | movlpd qword ptr [ebp - 0x30], xmm0 // 660f1345d8 | movlpd qword ptr [ebp - 0x28], xmm0 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8945e8 | mov dword ptr [ebp - 0x18], eax condition: 7 of them and filesize < 1067008 }
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