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rule win_bbsrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 68???????? b900040000 e8???????? 8b4c245c 83c40c 6a00 680001c884 } // n = 7, score = 100 // 68???????? | // b900040000 | mov ecx, 0x400 // e8???????? | // 8b4c245c | mov ecx, dword ptr [esp + 0x5c] // 83c40c | add esp, 0xc // 6a00 | push 0 // 680001c884 | push 0x84c80100 $sequence_1 = { 6800020000 51 8d942434040000 52 ffd6 8b8424301e0000 } // n = 6, score = 100 // 6800020000 | push 0x200 // 51 | push ecx // 8d942434040000 | lea edx, [esp + 0x434] // 52 | push edx // ffd6 | call esi // 8b8424301e0000 | mov eax, dword ptr [esp + 0x1e30] $sequence_2 = { 52 e8???????? 56 e8???????? 83c404 5e b801000000 } // n = 7, score = 100 // 52 | push edx // e8???????? | // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 5e | pop esi // b801000000 | mov eax, 1 $sequence_3 = { 6a00 51 ff15???????? 85f6 0f85bc000000 e8???????? 33c0 } // n = 7, score = 100 // 6a00 | push 0 // 51 | push ecx // ff15???????? | // 85f6 | test esi, esi // 0f85bc000000 | jne 0xc2 // e8???????? | // 33c0 | xor eax, eax $sequence_4 = { 8bec c7451800000000 c7451400000000 c7451000000000 c74508???????? 833d????????00 7516 } // n = 7, score = 100 // 8bec | mov ebp, esp // c7451800000000 | mov dword ptr [ebp + 0x18], 0 // c7451400000000 | mov dword ptr [ebp + 0x14], 0 // c7451000000000 | mov dword ptr [ebp + 0x10], 0 // c74508???????? | // 833d????????00 | // 7516 | jne 0x18 $sequence_5 = { 8bf8 83ffff 0f84e3000000 6a02 } // n = 4, score = 100 // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 0f84e3000000 | je 0xe9 // 6a02 | push 2 $sequence_6 = { 89442470 89442474 89442478 8944247c 89842480000000 8984248c000000 89842490000000 } // n = 7, score = 100 // 89442470 | mov dword ptr [esp + 0x70], eax // 89442474 | mov dword ptr [esp + 0x74], eax // 89442478 | mov dword ptr [esp + 0x78], eax // 8944247c | mov dword ptr [esp + 0x7c], eax // 89842480000000 | mov dword ptr [esp + 0x80], eax // 8984248c000000 | mov dword ptr [esp + 0x8c], eax // 89842490000000 | mov dword ptr [esp + 0x90], eax $sequence_7 = { 57 33f6 bf???????? 833cf5ecc6021001 751e 8d04f5e8c60210 8938 } // n = 7, score = 100 // 57 | push edi // 33f6 | xor esi, esi // bf???????? | // 833cf5ecc6021001 | cmp dword ptr [esi*8 + 0x1002c6ec], 1 // 751e | jne 0x20 // 8d04f5e8c60210 | lea eax, [esi*8 + 0x1002c6e8] // 8938 | mov dword ptr [eax], edi $sequence_8 = { c7451400010000 833d????????00 7516 68???????? a1???????? 50 } // n = 6, score = 100 // c7451400010000 | mov dword ptr [ebp + 0x14], 0x100 // 833d????????00 | // 7516 | jne 0x18 // 68???????? | // a1???????? | // 50 | push eax $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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