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rule win_bitter_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.bitter_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.bitter_rat" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 68???????? e8???????? 83c40c 6a01 68???????? 8b85e8feffff 2b85dcfeffff } // n = 7, score = 200 // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // 6a01 | push 1 // 68???????? | // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] // 2b85dcfeffff | sub eax, dword ptr [ebp - 0x124] $sequence_1 = { 8945f8 837df8ff 7504 b001 eb15 8bf4 8b45f8 } // n = 7, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 837df8ff | cmp dword ptr [ebp - 8], -1 // 7504 | jne 6 // b001 | mov al, 1 // eb15 | jmp 0x17 // 8bf4 | mov esi, esp // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_2 = { 3de1070000 7514 e8???????? e8???????? e8???????? e9???????? } // n = 6, score = 200 // 3de1070000 | cmp eax, 0x7e1 // 7514 | jne 0x16 // e8???????? | // e8???????? | // e8???????? | // e9???????? | $sequence_3 = { 7658 a1???????? 33d2 b97c230000 f7f1 a3???????? a1???????? } // n = 7, score = 200 // 7658 | jbe 0x5a // a1???????? | // 33d2 | xor edx, edx // b97c230000 | mov ecx, 0x237c // f7f1 | div ecx // a3???????? | // a1???????? | $sequence_4 = { 83c004 8945d4 5f 5e } // n = 4, score = 200 // 83c004 | add eax, 4 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 5f | pop edi // 5e | pop esi $sequence_5 = { 8955dc 8b45dc 99 b90a000000 f7f9 } // n = 5, score = 200 // 8955dc | mov dword ptr [ebp - 0x24], edx // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 99 | cdq // b90a000000 | mov ecx, 0xa // f7f9 | idiv ecx $sequence_6 = { e8???????? 6a0d 68???????? e8???????? 83c408 a1???????? 50 } // n = 7, score = 200 // e8???????? | // 6a0d | push 0xd // 68???????? | // e8???????? | // 83c408 | add esp, 8 // a1???????? | // 50 | push eax $sequence_7 = { 52 8bcd 50 8d1578bf4100 e8???????? 58 } // n = 6, score = 200 // 52 | push edx // 8bcd | mov ecx, ebp // 50 | push eax // 8d1578bf4100 | lea edx, [0x41bf78] // e8???????? | // 58 | pop eax $sequence_8 = { 50 e8???????? 83c40c a1???????? a3???????? 8bf4 6a00 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // a1???????? | // a3???????? | // 8bf4 | mov esi, esp // 6a00 | push 0 $sequence_9 = { 50 8d8d74dbffff 51 8b954cd9ffff 8d84157cdcffff 50 } // n = 6, score = 200 // 50 | push eax // 8d8d74dbffff | lea ecx, [ebp - 0x248c] // 51 | push ecx // 8b954cd9ffff | mov edx, dword ptr [ebp - 0x26b4] // 8d84157cdcffff | lea eax, [ebp + edx - 0x2384] // 50 | push eax condition: 7 of them and filesize < 1130496 }
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