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rule win_explosive_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8945c4 8b4514 8945c8 7611 33c0 8a03 8d4dc4 } // n = 7, score = 100 // 8945c4 | mov dword ptr [ebp - 0x3c], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8945c8 | mov dword ptr [ebp - 0x38], eax // 7611 | jbe 0x13 // 33c0 | xor eax, eax // 8a03 | mov al, byte ptr [ebx] // 8d4dc4 | lea ecx, [ebp - 0x3c] $sequence_1 = { 7445 6a03 8bc7 e8???????? 8b8648af0100 8bae44af0100 83c00a } // n = 7, score = 100 // 7445 | je 0x47 // 6a03 | push 3 // 8bc7 | mov eax, edi // e8???????? | // 8b8648af0100 | mov eax, dword ptr [esi + 0x1af48] // 8bae44af0100 | mov ebp, dword ptr [esi + 0x1af44] // 83c00a | add eax, 0xa $sequence_2 = { 66832300 33c0 c9 c3 85c0 7515 } // n = 6, score = 100 // 66832300 | and word ptr [ebx], 0 // 33c0 | xor eax, eax // c9 | leave // c3 | ret // 85c0 | test eax, eax // 7515 | jne 0x17 $sequence_3 = { eb60 807e0400 7507 8bce e8???????? 807e0530 7c62 } // n = 7, score = 100 // eb60 | jmp 0x62 // 807e0400 | cmp byte ptr [esi + 4], 0 // 7507 | jne 9 // 8bce | mov ecx, esi // e8???????? | // 807e0530 | cmp byte ptr [esi + 5], 0x30 // 7c62 | jl 0x64 $sequence_4 = { 53 55 8b6c2448 8b4d04 8b4104 56 8bf1 } // n = 7, score = 100 // 53 | push ebx // 55 | push ebp // 8b6c2448 | mov ebp, dword ptr [esp + 0x48] // 8b4d04 | mov ecx, dword ptr [ebp + 4] // 8b4104 | mov eax, dword ptr [ecx + 4] // 56 | push esi // 8bf1 | mov esi, ecx $sequence_5 = { 85ed 75e5 83f808 896b14 720f 8b4304 5f } // n = 7, score = 100 // 85ed | test ebp, ebp // 75e5 | jne 0xffffffe7 // 83f808 | cmp eax, 8 // 896b14 | mov dword ptr [ebx + 0x14], ebp // 720f | jb 0x11 // 8b4304 | mov eax, dword ptr [ebx + 4] // 5f | pop edi $sequence_6 = { 68???????? 51 e8???????? 8b4c2468 8b7c245c 50 8b442470 } // n = 7, score = 100 // 68???????? | // 51 | push ecx // e8???????? | // 8b4c2468 | mov ecx, dword ptr [esp + 0x68] // 8b7c245c | mov edi, dword ptr [esp + 0x5c] // 50 | push eax // 8b442470 | mov eax, dword ptr [esp + 0x70] $sequence_7 = { 8b442430 83c408 3bc7 720d 8b4c2414 51 e8???????? } // n = 7, score = 100 // 8b442430 | mov eax, dword ptr [esp + 0x30] // 83c408 | add esp, 8 // 3bc7 | cmp eax, edi // 720d | jb 0xf // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 51 | push ecx // e8???????? | $sequence_8 = { 8d5dd0 e8???????? 46 ebb8 b8???????? e8???????? be???????? } // n = 7, score = 100 // 8d5dd0 | lea ebx, [ebp - 0x30] // e8???????? | // 46 | inc esi // ebb8 | jmp 0xffffffba // b8???????? | // e8???????? | // be???????? | $sequence_9 = { 89ae88af0600 8bfa 7d2e 8a5c0aff 8a140a 885c241c 8854240f } // n = 7, score = 100 // 89ae88af0600 | mov dword ptr [esi + 0x6af88], ebp // 8bfa | mov edi, edx // 7d2e | jge 0x30 // 8a5c0aff | mov bl, byte ptr [edx + ecx - 1] // 8a140a | mov dl, byte ptr [edx + ecx] // 885c241c | mov byte ptr [esp + 0x1c], bl // 8854240f | mov byte ptr [esp + 0xf], dl condition: 7 of them and filesize < 855040 }
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