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rule win_tabmsgsql_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.tabmsgsql." 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.tabmsgsql" 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 = { 52 68???????? ffd7 83c408 8d4c240c 51 68???????? } // n = 7, score = 100 // 52 | push edx // 68???????? | // ffd7 | call edi // 83c408 | add esp, 8 // 8d4c240c | lea ecx, [esp + 0xc] // 51 | push ecx // 68???????? | $sequence_1 = { 56 e8???????? 83c410 85c0 0f8404ffffff be???????? 8d45c8 } // n = 7, score = 100 // 56 | push esi // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f8404ffffff | je 0xffffff0a // be???????? | // 8d45c8 | lea eax, [ebp - 0x38] $sequence_2 = { 51 50 e8???????? 83c408 eb62 } // n = 5, score = 100 // 51 | push ecx // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // eb62 | jmp 0x64 $sequence_3 = { 33c0 eb05 1bc0 83d8ff 3bc3 0f84b0090000 be???????? } // n = 7, score = 100 // 33c0 | xor eax, eax // eb05 | jmp 7 // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 // 3bc3 | cmp eax, ebx // 0f84b0090000 | je 0x9b6 // be???????? | $sequence_4 = { 55 52 e8???????? 83c418 85c0 7599 5f } // n = 7, score = 100 // 55 | push ebp // 52 | push edx // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax // 7599 | jne 0xffffff9b // 5f | pop edi $sequence_5 = { 8b4c242c c644241400 66ab aa 8b44242e 81e1ffff0000 25ffff0000 } // n = 7, score = 100 // 8b4c242c | mov ecx, dword ptr [esp + 0x2c] // c644241400 | mov byte ptr [esp + 0x14], 0 // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 8b44242e | mov eax, dword ptr [esp + 0x2e] // 81e1ffff0000 | and ecx, 0xffff // 25ffff0000 | and eax, 0xffff $sequence_6 = { 0f8eb2000000 8b7c2414 0fbe05???????? 33db 8a1c39 3bd8 } // n = 6, score = 100 // 0f8eb2000000 | jle 0xb8 // 8b7c2414 | mov edi, dword ptr [esp + 0x14] // 0fbe05???????? | // 33db | xor ebx, ebx // 8a1c39 | mov bl, byte ptr [ecx + edi] // 3bd8 | cmp ebx, eax $sequence_7 = { c1e902 f3a5 8bca 8d85c216fcff 83e103 } // n = 5, score = 100 // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bca | mov ecx, edx // 8d85c216fcff | lea eax, [ebp - 0x3e93e] // 83e103 | and ecx, 3 $sequence_8 = { f3a5 8bca 83e103 f3a4 ff15???????? 5e } // n = 6, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bca | mov ecx, edx // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // ff15???????? | // 5e | pop esi $sequence_9 = { 3bc3 0f84d7000000 b9???????? e8???????? 3bc3 } // n = 5, score = 100 // 3bc3 | cmp eax, ebx // 0f84d7000000 | je 0xdd // b9???????? | // e8???????? | // 3bc3 | cmp eax, ebx condition: 7 of them and filesize < 163840 }
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