Actor(s): TA505
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rule win_get2_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.get2." 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.get2" 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 = { 8d4c2404 742b e8???????? 8d4c240c ff7004 ff30 68???????? } // n = 7, score = 1000 // 8d4c2404 | lea ecx, [esp + 4] // 742b | je 0x2d // e8???????? | // 8d4c240c | lea ecx, [esp + 0xc] // ff7004 | push dword ptr [eax + 4] // ff30 | push dword ptr [eax] // 68???????? | $sequence_1 = { 7444 8b4508 660f6ec1 f30fe6c0 c1e91f 51 } // n = 6, score = 1000 // 7444 | je 0x46 // 8b4508 | mov eax, dword ptr [ebp + 8] // 660f6ec1 | movd xmm0, ecx // f30fe6c0 | cvtdq2pd xmm0, xmm0 // c1e91f | shr ecx, 0x1f // 51 | push ecx $sequence_2 = { 51 52 8d8d24ffffff 895dfc e8???????? } // n = 5, score = 1000 // 51 | push ecx // 52 | push edx // 8d8d24ffffff | lea ecx, [ebp - 0xdc] // 895dfc | mov dword ptr [ebp - 4], ebx // e8???????? | $sequence_3 = { 50 e8???????? 8b4508 8be5 5d c20400 68d0000000 } // n = 7, score = 1000 // 50 | push eax // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8be5 | mov esp, ebp // 5d | pop ebp // c20400 | ret 4 // 68d0000000 | push 0xd0 $sequence_4 = { 8b9188000000 32c0 85d2 744e 8b898c000000 85c9 } // n = 6, score = 1000 // 8b9188000000 | mov edx, dword ptr [ecx + 0x88] // 32c0 | xor al, al // 85d2 | test edx, edx // 744e | je 0x50 // 8b898c000000 | mov ecx, dword ptr [ecx + 0x8c] // 85c9 | test ecx, ecx $sequence_5 = { 897de8 33c0 895dd4 668945d8 51 51 } // n = 6, score = 1000 // 897de8 | mov dword ptr [ebp - 0x18], edi // 33c0 | xor eax, eax // 895dd4 | mov dword ptr [ebp - 0x2c], ebx // 668945d8 | mov word ptr [ebp - 0x28], ax // 51 | push ecx // 51 | push ecx $sequence_6 = { c20400 68d0000000 b8???????? e8???????? 8bf1 } // n = 5, score = 1000 // c20400 | ret 4 // 68d0000000 | push 0xd0 // b8???????? | // e8???????? | // 8bf1 | mov esi, ecx $sequence_7 = { 8d44240c 68???????? eb9e 8be5 5d } // n = 5, score = 1000 // 8d44240c | lea eax, [esp + 0xc] // 68???????? | // eb9e | jmp 0xffffffa0 // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_8 = { 89542420 4c8d0d2146feff 4c8b4570 8b5568 488b4d60 } // n = 5, score = 100 // 89542420 | dec eax // 4c8d0d2146feff | lea edx, [esp + 0x350] // 4c8b4570 | dec eax // 8b5568 | lea ecx, [esp + 0x4b0] // 488b4d60 | mov dword ptr [esp + 0x70], ecx $sequence_9 = { c78424b001000014010000 488d8c24b0010000 ff15???????? 41b804000000 488d15f5700300 } // n = 5, score = 100 // c78424b001000014010000 | cmp dword ptr [esi + 0x130], 0 // 488d8c24b0010000 | mov dword ptr [esp + 0x20], edx // ff15???????? | // 41b804000000 | dec esp // 488d15f5700300 | lea ecx, [0xfffe4621] $sequence_10 = { 0fb606 3c20 7510 4885ff } // n = 4, score = 100 // 0fb606 | lea eax, [0x2a574] // 3c20 | dec eax // 7510 | mov dword ptr [ecx], eax // 4885ff | dec eax $sequence_11 = { 4933d0 4b8794f7c0570400 eb2d 4c8b15???????? } // n = 4, score = 100 // 4933d0 | cmp eax, 3 // 4b8794f7c0570400 | jae 0xe08 // eb2d | dec ecx // 4c8b15???????? | $sequence_12 = { 4883ec20 488bda 488d0574a50200 488901 488d5108 } // n = 5, score = 100 // 4883ec20 | dec eax // 488bda | sub esp, 0x20 // 488d0574a50200 | dec eax // 488901 | mov ebx, edx // 488d5108 | dec eax $sequence_13 = { 894c2470 83f803 0f83ff0d0000 4983be3001000000 } // n = 4, score = 100 // 894c2470 | dec eax // 83f803 | test edi, edi // 0f83ff0d0000 | test eax, eax // 4983be3001000000 | je 0x48 $sequence_14 = { c70301000000 83c8ff e9???????? 488b4b10 } // n = 4, score = 100 // c70301000000 | dec esp // 83c8ff | mov eax, dword ptr [ebp + 0x70] // e9???????? | // 488b4b10 | mov edx, dword ptr [ebp + 0x68] $sequence_15 = { ff15???????? 85c0 7446 488d942450030000 488d8c24b0040000 } // n = 5, score = 100 // ff15???????? | // 85c0 | lea edx, [ecx + 8] // 7446 | movzx eax, byte ptr [esi] // 488d942450030000 | cmp al, 0x20 // 488d8c24b0040000 | jne 0x14 condition: 7 of them and filesize < 720896 }
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