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rule win_bagle_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bagle." 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.bagle" 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 = { b03d f3aa 5b 5f 5e c9 } // n = 6, score = 300 // b03d | mov al, 0x3d // f3aa | rep stosb byte ptr es:[edi], al // 5b | pop ebx // 5f | pop edi // 5e | pop esi // c9 | leave $sequence_1 = { c745f400000000 6a06 6a01 6a02 e8???????? 8bd8 ff7508 } // n = 7, score = 300 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8bd8 | mov ebx, eax // ff7508 | push dword ptr [ebp + 8] $sequence_2 = { e340 ac c1e010 83f901 740b } // n = 5, score = 300 // e340 | jecxz 0x42 // ac | lodsb al, byte ptr [esi] // c1e010 | shl eax, 0x10 // 83f901 | cmp ecx, 1 // 740b | je 0xd $sequence_3 = { c9 c20c00 c1c206 8bc2 } // n = 4, score = 300 // c9 | leave // c20c00 | ret 0xc // c1c206 | rol edx, 6 // 8bc2 | mov eax, edx $sequence_4 = { f7d9 2bf9 b03d f3aa 5b 5f 5e } // n = 7, score = 300 // f7d9 | neg ecx // 2bf9 | sub edi, ecx // b03d | mov al, 0x3d // f3aa | rep stosb byte ptr es:[edi], al // 5b | pop ebx // 5f | pop edi // 5e | pop esi $sequence_5 = { 68???????? e8???????? 0bc0 7426 6880000000 68???????? e8???????? } // n = 7, score = 300 // 68???????? | // e8???????? | // 0bc0 | or eax, eax // 7426 | je 0x28 // 6880000000 | push 0x80 // 68???????? | // e8???????? | $sequence_6 = { c20c00 c1c206 8bc2 243f 3c3e } // n = 5, score = 300 // c20c00 | ret 0xc // c1c206 | rol edx, 6 // 8bc2 | mov eax, edx // 243f | and al, 0x3f // 3c3e | cmp al, 0x3e $sequence_7 = { 53 8b7508 8b7d0c 8b4d10 } // n = 4, score = 300 // 53 | push ebx // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_8 = { 59 43 83fb12 7508 33db } // n = 5, score = 300 // 59 | pop ecx // 43 | inc ebx // 83fb12 | cmp ebx, 0x12 // 7508 | jne 0xa // 33db | xor ebx, ebx $sequence_9 = { e8???????? 58 c9 c20400 55 8bec 83c4f8 } // n = 7, score = 300 // e8???????? | // 58 | pop eax // c9 | leave // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // 83c4f8 | add esp, -8 condition: 7 of them and filesize < 245760 }
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