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rule win_bbsrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 740e bf00800c00 8bf0 e8???????? eb02 33c0 55 } // n = 7, score = 100 // 740e | je 0x10 // bf00800c00 | mov edi, 0xc8000 // 8bf0 | mov esi, eax // e8???????? | // eb02 | jmp 4 // 33c0 | xor eax, eax // 55 | push ebp $sequence_1 = { 56 33f6 68fc0f0000 8d442458 56 50 } // n = 6, score = 100 // 56 | push esi // 33f6 | xor esi, esi // 68fc0f0000 | push 0xffc // 8d442458 | lea eax, [esp + 0x58] // 56 | push esi // 50 | push eax $sequence_2 = { 0f87dd090000 ff248503bc0110 33c0 838df4fbffffff 8985a4fbffff 8985b0fbffff 8985d4fbffff } // n = 7, score = 100 // 0f87dd090000 | ja 0x9e3 // ff248503bc0110 | jmp dword ptr [eax*4 + 0x1001bc03] // 33c0 | xor eax, eax // 838df4fbffffff | or dword ptr [ebp - 0x40c], 0xffffffff // 8985a4fbffff | mov dword ptr [ebp - 0x45c], eax // 8985b0fbffff | mov dword ptr [ebp - 0x450], eax // 8985d4fbffff | mov dword ptr [ebp - 0x42c], eax $sequence_3 = { 52 6a05 53 c744243830750000 e8???????? 6a04 } // n = 6, score = 100 // 52 | push edx // 6a05 | push 5 // 53 | push ebx // c744243830750000 | mov dword ptr [esp + 0x38], 0x7530 // e8???????? | // 6a04 | push 4 $sequence_4 = { 50 6a08 ff15???????? 50 ff15???????? 8b542414 8d4c2414 } // n = 7, score = 100 // 50 | push eax // 6a08 | push 8 // ff15???????? | // 50 | push eax // ff15???????? | // 8b542414 | mov edx, dword ptr [esp + 0x14] // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_5 = { 83c420 6a3a 56 6868001100 55 } // n = 5, score = 100 // 83c420 | add esp, 0x20 // 6a3a | push 0x3a // 56 | push esi // 6868001100 | push 0x110068 // 55 | push ebp $sequence_6 = { 8bc7 e8???????? 85db 751a e8???????? 33c0 3b7810 } // n = 7, score = 100 // 8bc7 | mov eax, edi // e8???????? | // 85db | test ebx, ebx // 751a | jne 0x1c // e8???????? | // 33c0 | xor eax, eax // 3b7810 | cmp edi, dword ptr [eax + 0x10] $sequence_7 = { a1???????? 33c4 8984240c020000 33c0 6806020000 50 8d4c240a } // n = 7, score = 100 // a1???????? | // 33c4 | xor eax, esp // 8984240c020000 | mov dword ptr [esp + 0x20c], eax // 33c0 | xor eax, eax // 6806020000 | push 0x206 // 50 | push eax // 8d4c240a | lea ecx, [esp + 0xa] $sequence_8 = { 83e30f 2bc3 8b0c9df8c30210 23ca 034e04 894c242c 8bcb } // n = 7, score = 100 // 83e30f | and ebx, 0xf // 2bc3 | sub eax, ebx // 8b0c9df8c30210 | mov ecx, dword ptr [ebx*4 + 0x1002c3f8] // 23ca | and ecx, edx // 034e04 | add ecx, dword ptr [esi + 4] // 894c242c | mov dword ptr [esp + 0x2c], ecx // 8bcb | mov ecx, ebx $sequence_9 = { 8d542428 52 6a00 6a00 6a00 6a01 6a00 } // n = 7, score = 100 // 8d542428 | lea edx, [esp + 0x28] // 52 | push edx // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 // 6a00 | push 0 condition: 7 of them and filesize < 434176 }
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