Actor(s): Turla Group
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rule win_crutch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { 668944241c 89442414 8844241e 8b8264010000 56 8bb2f4000000 57 } // n = 7, score = 100 // 668944241c | mov word ptr [esp + 0x1c], ax // 89442414 | mov dword ptr [esp + 0x14], eax // 8844241e | mov byte ptr [esp + 0x1e], al // 8b8264010000 | mov eax, dword ptr [edx + 0x164] // 56 | push esi // 8bb2f4000000 | mov esi, dword ptr [edx + 0xf4] // 57 | push edi $sequence_1 = { 8b908c030000 8911 33c0 c3 8b80b04a0000 8901 33c0 } // n = 7, score = 100 // 8b908c030000 | mov edx, dword ptr [eax + 0x38c] // 8911 | mov dword ptr [ecx], edx // 33c0 | xor eax, eax // c3 | ret // 8b80b04a0000 | mov eax, dword ptr [eax + 0x4ab0] // 8901 | mov dword ptr [ecx], eax // 33c0 | xor eax, eax $sequence_2 = { 8b442418 85c0 7556 3944241c 754e 3985d0020000 7546 } // n = 7, score = 100 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 85c0 | test eax, eax // 7556 | jne 0x58 // 3944241c | cmp dword ptr [esp + 0x1c], eax // 754e | jne 0x50 // 3985d0020000 | cmp dword ptr [ebp + 0x2d0], eax // 7546 | jne 0x48 $sequence_3 = { 0f92c1 f7d9 0bc8 6a00 51 c7460400000000 e8???????? } // n = 7, score = 100 // 0f92c1 | setb cl // f7d9 | neg ecx // 0bc8 | or ecx, eax // 6a00 | push 0 // 51 | push ecx // c7460400000000 | mov dword ptr [esi + 4], 0 // e8???????? | $sequence_4 = { 8b08 898ea8000000 8b5004 8996ac000000 8b4808 898eb0000000 } // n = 6, score = 100 // 8b08 | mov ecx, dword ptr [eax] // 898ea8000000 | mov dword ptr [esi + 0xa8], ecx // 8b5004 | mov edx, dword ptr [eax + 4] // 8996ac000000 | mov dword ptr [esi + 0xac], edx // 8b4808 | mov ecx, dword ptr [eax + 8] // 898eb0000000 | mov dword ptr [esi + 0xb0], ecx $sequence_5 = { ff4f14 8bf5 85ed 75cd 8b442410 8344241810 40 } // n = 7, score = 100 // ff4f14 | dec dword ptr [edi + 0x14] // 8bf5 | mov esi, ebp // 85ed | test ebp, ebp // 75cd | jne 0xffffffcf // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8344241810 | add dword ptr [esp + 0x18], 0x10 // 40 | inc eax $sequence_6 = { 6a5d 56 894c2428 e8???????? 8be8 83c408 } // n = 6, score = 100 // 6a5d | push 0x5d // 56 | push esi // 894c2428 | mov dword ptr [esp + 0x28], ecx // e8???????? | // 8be8 | mov ebp, eax // 83c408 | add esp, 8 $sequence_7 = { 8b4b28 51 ff15???????? 8b532c 52 ff15???????? 8b442434 } // n = 7, score = 100 // 8b4b28 | mov ecx, dword ptr [ebx + 0x28] // 51 | push ecx // ff15???????? | // 8b532c | mov edx, dword ptr [ebx + 0x2c] // 52 | push edx // ff15???????? | // 8b442434 | mov eax, dword ptr [esp + 0x34] $sequence_8 = { 68???????? e8???????? 8bf0 83c404 85f6 7507 b81b000000 } // n = 7, score = 100 // 68???????? | // e8???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi // 7507 | jne 9 // b81b000000 | mov eax, 0x1b $sequence_9 = { 8954243c 8b542460 03c7 89442444 33c0 57 8944244c } // n = 7, score = 100 // 8954243c | mov dword ptr [esp + 0x3c], edx // 8b542460 | mov edx, dword ptr [esp + 0x60] // 03c7 | add eax, edi // 89442444 | mov dword ptr [esp + 0x44], eax // 33c0 | xor eax, eax // 57 | push edi // 8944244c | mov dword ptr [esp + 0x4c], eax condition: 7 of them and filesize < 1067008 }
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