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rule win_bohmini_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bohmini." 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.bohmini" 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 = { 896c2410 896c2414 0f86c5000000 8b7c2420 } // n = 4, score = 100 // 896c2410 | mov dword ptr [esp + 0x10], ebp // 896c2414 | mov dword ptr [esp + 0x14], ebp // 0f86c5000000 | jbe 0xcb // 8b7c2420 | mov edi, dword ptr [esp + 0x20] $sequence_1 = { 6a00 6a00 8bca 83c11a 51 6a00 6a00 } // n = 7, score = 100 // 6a00 | push 0 // 6a00 | push 0 // 8bca | mov ecx, edx // 83c11a | add ecx, 0x1a // 51 | push ecx // 6a00 | push 0 // 6a00 | push 0 $sequence_2 = { 8d542414 6a00 52 ff15???????? 85c0 } // n = 5, score = 100 // 8d542414 | lea edx, [esp + 0x14] // 6a00 | push 0 // 52 | push edx // ff15???????? | // 85c0 | test eax, eax $sequence_3 = { ff15???????? 3bc3 a3???????? 7512 5f 5e } // n = 6, score = 100 // ff15???????? | // 3bc3 | cmp eax, ebx // a3???????? | // 7512 | jne 0x14 // 5f | pop edi // 5e | pop esi $sequence_4 = { 6800040000 50 53 ff15???????? 50 ff15???????? } // n = 6, score = 100 // 6800040000 | push 0x400 // 50 | push eax // 53 | push ebx // ff15???????? | // 50 | push eax // ff15???????? | $sequence_5 = { 4a 741a 4a 7543 e8???????? 03c6 33d2 } // n = 7, score = 100 // 4a | dec edx // 741a | je 0x1c // 4a | dec edx // 7543 | jne 0x45 // e8???????? | // 03c6 | add eax, esi // 33d2 | xor edx, edx $sequence_6 = { 83c410 85c0 7507 6891130000 eb2a } // n = 5, score = 100 // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 7507 | jne 9 // 6891130000 | push 0x1391 // eb2a | jmp 0x2c $sequence_7 = { 8b5608 52 ffd5 40 50 } // n = 5, score = 100 // 8b5608 | mov edx, dword ptr [esi + 8] // 52 | push edx // ffd5 | call ebp // 40 | inc eax // 50 | push eax $sequence_8 = { 52 e8???????? 40 50 8d8424b8010000 50 } // n = 6, score = 100 // 52 | push edx // e8???????? | // 40 | inc eax // 50 | push eax // 8d8424b8010000 | lea eax, [esp + 0x1b8] // 50 | push eax $sequence_9 = { 8b2d???????? 8b3e 51 6a00 ffd5 50 ffd3 } // n = 7, score = 100 // 8b2d???????? | // 8b3e | mov edi, dword ptr [esi] // 51 | push ecx // 6a00 | push 0 // ffd5 | call ebp // 50 | push eax // ffd3 | call ebx condition: 7 of them and filesize < 139264 }
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