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rule win_bbsrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.bbsrat." 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.bbsrat" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 751f 8b4b28 57 51 c74318bcc30210 befdffffff } // n = 6, score = 100 // 751f | jne 0x21 // 8b4b28 | mov ecx, dword ptr [ebx + 0x28] // 57 | push edi // 51 | push ecx // c74318bcc30210 | mov dword ptr [ebx + 0x18], 0x1002c3bc // befdffffff | mov esi, 0xfffffffd $sequence_1 = { 55 52 896c241c e8???????? 8b842488040000 83c40c 83c0f0 } // n = 7, score = 100 // 55 | push ebp // 52 | push edx // 896c241c | mov dword ptr [esp + 0x1c], ebp // e8???????? | // 8b842488040000 | mov eax, dword ptr [esp + 0x488] // 83c40c | add esp, 0xc // 83c0f0 | add eax, -0x10 $sequence_2 = { e8???????? 83c404 eb55 8b442424 83f806 751e 8d94243c010000 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // eb55 | jmp 0x57 // 8b442424 | mov eax, dword ptr [esp + 0x24] // 83f806 | cmp eax, 6 // 751e | jne 0x20 // 8d94243c010000 | lea edx, dword ptr [esp + 0x13c] $sequence_3 = { 50 8d4f10 6864020000 51 e8???????? 83c420 } // n = 6, score = 100 // 50 | push eax // 8d4f10 | lea ecx, dword ptr [edi + 0x10] // 6864020000 | push 0x264 // 51 | push ecx // e8???????? | // 83c420 | add esp, 0x20 $sequence_4 = { e8???????? 8b4718 8d7710 83c40c 03c6 8d542430 e8???????? } // n = 7, score = 100 // e8???????? | // 8b4718 | mov eax, dword ptr [edi + 0x18] // 8d7710 | lea esi, dword ptr [edi + 0x10] // 83c40c | add esp, 0xc // 03c6 | add eax, esi // 8d542430 | lea edx, dword ptr [esp + 0x30] // e8???????? | $sequence_5 = { ff15???????? 8bf0 85f6 7412 8d442404 50 ff15???????? } // n = 7, score = 100 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7412 | je 0x14 // 8d442404 | lea eax, dword ptr [esp + 4] // 50 | push eax // ff15???????? | $sequence_6 = { 8be5 5d c20c00 51 e8???????? 8be5 5d } // n = 7, score = 100 // 8be5 | mov esp, ebp // 5d | pop ebp // c20c00 | ret 0xc // 51 | push ecx // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_7 = { 8d44240c 50 8b44240c 8d8c2420020000 51 8d542418 52 } // n = 7, score = 100 // 8d44240c | lea eax, dword ptr [esp + 0xc] // 50 | push eax // 8b44240c | mov eax, dword ptr [esp + 0xc] // 8d8c2420020000 | lea ecx, dword ptr [esp + 0x220] // 51 | push ecx // 8d542418 | lea edx, dword ptr [esp + 0x18] // 52 | push edx $sequence_8 = { 8b7e28 8b4e58 2bfd 4f 0faf7e70 037e5c } // n = 6, score = 100 // 8b7e28 | mov edi, dword ptr [esi + 0x28] // 8b4e58 | mov ecx, dword ptr [esi + 0x58] // 2bfd | sub edi, ebp // 4f | dec edi // 0faf7e70 | imul edi, dword ptr [esi + 0x70] // 037e5c | add edi, dword ptr [esi + 0x5c] $sequence_9 = { 83c420 6a3a 56 6868001100 55 e8???????? 56 } // n = 7, score = 100 // 83c420 | add esp, 0x20 // 6a3a | push 0x3a // 56 | push esi // 6868001100 | push 0x110068 // 55 | push ebp // e8???????? | // 56 | push esi condition: 7 of them and filesize < 434176 }
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