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rule win_bagle_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 59 e8???????? e2f9 59 43 83fb12 } // n = 6, score = 300 // 59 | pop ecx // e8???????? | // e2f9 | loop 0xfffffffb // 59 | pop ecx // 43 | inc ebx // 83fb12 | cmp ebx, 0x12 $sequence_1 = { 6a06 6a01 6a02 e8???????? 8bd8 ff7508 } // n = 6, score = 300 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8bd8 | mov ebx, eax // ff7508 | push dword ptr [ebp + 8] $sequence_2 = { 7426 6880000000 68???????? e8???????? 6a00 } // n = 5, score = 300 // 7426 | je 0x28 // 6880000000 | push 0x80 // 68???????? | // e8???????? | // 6a00 | push 0 $sequence_3 = { eb07 2c3e c0e002 042b aa } // n = 5, score = 300 // eb07 | jmp 9 // 2c3e | sub al, 0x3e // c0e002 | shl al, 2 // 042b | add al, 0x2b // aa | stosb byte ptr es:[edi], al $sequence_4 = { 56 57 53 8b7508 8b7d0c 8b4d10 33db } // n = 7, score = 300 // 56 | push esi // 57 | push edi // 53 | push ebx // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 33db | xor ebx, ebx $sequence_5 = { 68???????? e8???????? 68???????? 68???????? e8???????? 6804010000 } // n = 6, score = 300 // 68???????? | // e8???????? | // 68???????? | // 68???????? | // e8???????? | // 6804010000 | push 0x104 $sequence_6 = { e8???????? e2f9 59 43 83fb12 7508 } // n = 6, score = 300 // e8???????? | // e2f9 | loop 0xfffffffb // 59 | pop ecx // 43 | inc ebx // 83fb12 | cmp ebx, 0x12 // 7508 | jne 0xa $sequence_7 = { eb0b 04fc eb07 2c3e c0e002 042b aa } // n = 7, score = 300 // eb0b | jmp 0xd // 04fc | add al, 0xfc // eb07 | jmp 9 // 2c3e | sub al, 0x3e // c0e002 | shl al, 2 // 042b | add al, 0x2b // aa | stosb byte ptr es:[edi], al $sequence_8 = { 83fb12 7508 33db 66b80d0a } // n = 4, score = 300 // 83fb12 | cmp ebx, 0x12 // 7508 | jne 0xa // 33db | xor ebx, ebx // 66b80d0a | mov ax, 0xa0d $sequence_9 = { c745f400000000 6a06 6a01 6a02 e8???????? 8bd8 } // n = 6, score = 300 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 6a06 | push 6 // 6a01 | push 1 // 6a02 | push 2 // e8???????? | // 8bd8 | mov ebx, eax condition: 7 of them and filesize < 245760 }
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