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rule win_carrotbat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8b7c2404 66c1c60c 8b742408 f6d7 33cd f7d3 } // n = 6, score = 100 // 8b7c2404 | mov edi, dword ptr [esp + 4] // 66c1c60c | rol si, 0xc // 8b742408 | mov esi, dword ptr [esp + 8] // f6d7 | not bh // 33cd | xor ecx, ebp // f7d3 | not ebx $sequence_1 = { 8f442434 51 887c2404 66890424 890424 } // n = 5, score = 100 // 8f442434 | pop dword ptr [esp + 0x34] // 51 | push ecx // 887c2404 | mov byte ptr [esp + 4], bh // 66890424 | mov word ptr [esp], ax // 890424 | mov dword ptr [esp], eax $sequence_2 = { 8b0c8d20ee4000 8d440104 8020fe ff36 e8???????? 59 } // n = 6, score = 100 // 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] // e8???????? | // 59 | pop ecx $sequence_3 = { c3 8bff 56 57 33f6 bf???????? 833cf5a4d5400001 } // n = 7, score = 100 // c3 | ret // 8bff | mov edi, edi // 56 | push esi // 57 | push edi // 33f6 | xor esi, esi // bf???????? | // 833cf5a4d5400001 | cmp dword ptr [esi*8 + 0x40d5a4], 1 $sequence_4 = { 8b0c8d20ee4000 c1e006 8d440104 8020fe ff36 } // n = 5, score = 100 // 8b0c8d20ee4000 | mov ecx, dword ptr [ecx*4 + 0x40ee20] // c1e006 | shl eax, 6 // 8d440104 | lea eax, [ecx + eax + 4] // 8020fe | and byte ptr [eax], 0xfe // ff36 | push dword ptr [esi] $sequence_5 = { c1f805 8d3c8520ee4000 8bf3 83e61f c1e606 8b07 0fbe440604 } // n = 7, score = 100 // c1f805 | sar eax, 5 // 8d3c8520ee4000 | lea edi, [eax*4 + 0x40ee20] // 8bf3 | mov esi, ebx // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8b07 | mov eax, dword ptr [edi] // 0fbe440604 | movsx eax, byte ptr [esi + eax + 4] $sequence_6 = { 888c05f4fdffff 40 84c9 75ed 8d85f8feffff 6a5c } // n = 6, score = 100 // 888c05f4fdffff | mov byte ptr [ebp + eax - 0x20c], cl // 40 | inc eax // 84c9 | test cl, cl // 75ed | jne 0xffffffef // 8d85f8feffff | lea eax, [ebp - 0x108] // 6a5c | push 0x5c $sequence_7 = { 50 66a5 ff15???????? 6810270000 ff15???????? } // n = 5, score = 100 // 50 | push eax // 66a5 | movsw word ptr es:[edi], word ptr [esi] // ff15???????? | // 6810270000 | push 0x2710 // ff15???????? | $sequence_8 = { 5b c21000 ff25???????? c705????????6ca14000 } // n = 4, score = 100 // 5b | pop ebx // c21000 | ret 0x10 // ff25???????? | // c705????????6ca14000 | $sequence_9 = { 8f442434 9c 57 ff74243c c24000 686d3f4f6e } // n = 6, score = 100 // 8f442434 | pop dword ptr [esp + 0x34] // 9c | pushfd // 57 | push edi // ff74243c | push dword ptr [esp + 0x3c] // c24000 | ret 0x40 // 686d3f4f6e | push 0x6e4f3f6d condition: 7 of them and filesize < 360448 }
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