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rule win_carrotbat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.carrotbat." 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.carrotbat" 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 = { 83e01f c1fa05 8b149520ee4000 59 c1e006 59 8a4dff } // n = 7, score = 100 // 83e01f | and eax, 0x1f // c1fa05 | sar edx, 5 // 8b149520ee4000 | mov edx, dword ptr [edx*4 + 0x40ee20] // 59 | pop ecx // c1e006 | shl eax, 6 // 59 | pop ecx // 8a4dff | mov cl, byte ptr [ebp - 1] $sequence_1 = { 57 33ff ffb7d0d64000 ff15???????? } // n = 4, score = 100 // 57 | push edi // 33ff | xor edi, edi // ffb7d0d64000 | push dword ptr [edi + 0x40d6d0] // ff15???????? | $sequence_2 = { 85c9 7e0f 8a1c3a 889c1001ed4000 42 } // n = 5, score = 100 // 85c9 | test ecx, ecx // 7e0f | jle 0x11 // 8a1c3a | mov bl, byte ptr [edx + edi] // 889c1001ed4000 | mov byte ptr [eax + edx + 0x40ed01], bl // 42 | inc edx $sequence_3 = { c1f805 8b048520ee4000 83e61f c1e606 8d443004 8020fe } // n = 6, score = 100 // c1f805 | sar eax, 5 // 8b048520ee4000 | mov eax, dword ptr [eax*4 + 0x40ee20] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8d443004 | lea eax, [eax + esi + 4] // 8020fe | and byte ptr [eax], 0xfe $sequence_4 = { e8???????? 59 897dfc 897dd8 83ff40 0f8d3b010000 8b34bd20ee4000 } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 897dfc | mov dword ptr [ebp - 4], edi // 897dd8 | mov dword ptr [ebp - 0x28], edi // 83ff40 | cmp edi, 0x40 // 0f8d3b010000 | jge 0x141 // 8b34bd20ee4000 | mov esi, dword ptr [edi*4 + 0x40ee20] $sequence_5 = { c1e006 8b0c8d20ee4000 8d440104 8020fe ff36 } // n = 5, score = 100 // c1e006 | shl eax, 6 // 8b0c8d20ee4000 | mov ecx, dword ptr [ecx*4 + 0x40ee20] // 8d440104 | lea eax, [ecx + eax + 4] // 8020fe | and byte ptr [eax], 0xfe // ff36 | push dword ptr [esi] $sequence_6 = { 660fb6cb 893424 0fc9 f6d5 } // n = 4, score = 100 // 660fb6cb | movzx cx, bl // 893424 | mov dword ptr [esp], esi // 0fc9 | bswap ecx // f6d5 | not ch $sequence_7 = { a3???????? 33c0 c3 8bff 55 8bec b8e41a0000 } // n = 7, score = 100 // a3???????? | // 33c0 | xor eax, eax // c3 | ret // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // b8e41a0000 | mov eax, 0x1ae4 $sequence_8 = { 53 c7042405000000 e8???????? ff35???????? 8f442434 9c } // n = 6, score = 100 // 53 | push ebx // c7042405000000 | mov dword ptr [esp], 5 // e8???????? | // ff35???????? | // 8f442434 | pop dword ptr [esp + 0x34] // 9c | pushfd $sequence_9 = { 7e15 8dbc0101ed4000 8b5d0c 8a1c1e } // n = 4, score = 100 // 7e15 | jle 0x17 // 8dbc0101ed4000 | lea edi, [ecx + eax + 0x40ed01] // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] // 8a1c1e | mov bl, byte ptr [esi + ebx] condition: 7 of them and filesize < 360448 }
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