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rule win_bagle_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 6a02 6a00 ff75fc e8???????? 0bc0 } // n = 5, score = 300 // 6a02 | push 2 // 6a00 | push 0 // ff75fc | push dword ptr [ebp - 4] // e8???????? | // 0bc0 | or eax, eax $sequence_1 = { 75e2 c3 55 8bec 56 8b4508 } // n = 6, score = 300 // 75e2 | jne 0xffffffe4 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 56 | push esi // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_2 = { 6a02 e8???????? 8bd8 ff7508 e8???????? 83fbff } // n = 6, score = 300 // 6a02 | push 2 // e8???????? | // 8bd8 | mov ebx, eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 83fbff | cmp ebx, -1 $sequence_3 = { 5e c9 c20c00 c1c206 8bc2 243f } // n = 6, score = 300 // 5e | pop esi // c9 | leave // c20c00 | ret 0xc // c1c206 | rol edx, 6 // 8bc2 | mov eax, edx // 243f | and al, 0x3f $sequence_4 = { 8b4d10 33db e340 ac } // n = 4, score = 300 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 33db | xor ebx, ebx // e340 | jecxz 0x42 // ac | lodsb al, byte ptr [esi] $sequence_5 = { 6a00 6a00 6a00 ff7508 e8???????? 6a00 } // n = 6, score = 300 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 6a00 | push 0 $sequence_6 = { 79c6 f7d9 2bf9 b03d } // n = 4, score = 300 // 79c6 | jns 0xffffffc8 // f7d9 | neg ecx // 2bf9 | sub edi, ecx // b03d | mov al, 0x3d $sequence_7 = { 6880000000 68???????? e8???????? 6a00 6a00 6a00 68???????? } // n = 7, score = 300 // 6880000000 | push 0x80 // 68???????? | // e8???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | condition: 7 of them and filesize < 245760 }
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