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rule win_explosive_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.explosive_rat." 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.explosive_rat" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 83e0ef 83c802 66a90c01 89460c 895e04 895d0c 7525 } // n = 7, score = 100 // 83e0ef | and eax, 0xffffffef // 83c802 | or eax, 2 // 66a90c01 | test ax, 0x10c // 89460c | mov dword ptr [esi + 0xc], eax // 895e04 | mov dword ptr [esi + 4], ebx // 895d0c | mov dword ptr [ebp + 0xc], ebx // 7525 | jne 0x27 $sequence_1 = { 8d8dd4feffff e8???????? 8d8d10feffff e8???????? 8d4dd0 e8???????? 8d8d9cfeffff } // n = 7, score = 100 // 8d8dd4feffff | lea ecx, [ebp - 0x12c] // e8???????? | // 8d8d10feffff | lea ecx, [ebp - 0x1f0] // e8???????? | // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | // 8d8d9cfeffff | lea ecx, [ebp - 0x164] $sequence_2 = { 68???????? 52 e8???????? 0fb74c2420 0fb754241e 51 0fb74c2420 } // n = 7, score = 100 // 68???????? | // 52 | push edx // e8???????? | // 0fb74c2420 | movzx ecx, word ptr [esp + 0x20] // 0fb754241e | movzx edx, word ptr [esp + 0x1e] // 51 | push ecx // 0fb74c2420 | movzx ecx, word ptr [esp + 0x20] $sequence_3 = { 50 b9???????? e8???????? 8bce e8???????? bb10000000 391d???????? } // n = 7, score = 100 // 50 | push eax // b9???????? | // e8???????? | // 8bce | mov ecx, esi // e8???????? | // bb10000000 | mov ebx, 0x10 // 391d???????? | $sequence_4 = { 55 8b6c2410 8bd9 7431 837b1808 722b 85ed } // n = 7, score = 100 // 55 | push ebp // 8b6c2410 | mov ebp, dword ptr [esp + 0x10] // 8bd9 | mov ebx, ecx // 7431 | je 0x33 // 837b1808 | cmp dword ptr [ebx + 0x18], 8 // 722b | jb 0x2d // 85ed | test ebp, ebp $sequence_5 = { 8bef 7702 8be9 85ed 7506 5d 5f } // n = 7, score = 100 // 8bef | mov ebp, edi // 7702 | ja 4 // 8be9 | mov ebp, ecx // 85ed | test ebp, ebp // 7506 | jne 8 // 5d | pop ebp // 5f | pop edi $sequence_6 = { 68???????? e8???????? 56 e8???????? 83c404 8bcc 68???????? } // n = 7, score = 100 // 68???????? | // e8???????? | // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 8bcc | mov ecx, esp // 68???????? | $sequence_7 = { 8bf1 89442428 8b4614 6a20 33db 50 8d4c2414 } // n = 7, score = 100 // 8bf1 | mov esi, ecx // 89442428 | mov dword ptr [esp + 0x28], eax // 8b4614 | mov eax, dword ptr [esi + 0x14] // 6a20 | push 0x20 // 33db | xor ebx, ebx // 50 | push eax // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_8 = { 894510 8b7d24 833e00 0f857b020000 807d1000 7508 8d4d0c } // n = 7, score = 100 // 894510 | mov dword ptr [ebp + 0x10], eax // 8b7d24 | mov edi, dword ptr [ebp + 0x24] // 833e00 | cmp dword ptr [esi], 0 // 0f857b020000 | jne 0x281 // 807d1000 | cmp byte ptr [ebp + 0x10], 0 // 7508 | jne 0xa // 8d4d0c | lea ecx, [ebp + 0xc] $sequence_9 = { 894e08 895604 8b10 6aff 8d4e10 89560c 6a00 } // n = 7, score = 100 // 894e08 | mov dword ptr [esi + 8], ecx // 895604 | mov dword ptr [esi + 4], edx // 8b10 | mov edx, dword ptr [eax] // 6aff | push -1 // 8d4e10 | lea ecx, [esi + 0x10] // 89560c | mov dword ptr [esi + 0xc], edx // 6a00 | push 0 condition: 7 of them and filesize < 855040 }
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