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rule win_tabmsgsql_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { a1???????? 85c0 74e1 a1???????? 85c0 741a a1???????? } // n = 7, score = 100 // a1???????? | // 85c0 | test eax, eax // 74e1 | je 0xffffffe3 // a1???????? | // 85c0 | test eax, eax // 741a | je 0x1c // a1???????? | $sequence_1 = { c3 8d560a 52 68???????? } // n = 4, score = 100 // c3 | ret // 8d560a | lea edx, [esi + 0xa] // 52 | push edx // 68???????? | $sequence_2 = { 50 57 6a01 56 ff15???????? 8b442444 8b4c2448 } // n = 7, score = 100 // 50 | push eax // 57 | push edi // 6a01 | push 1 // 56 | push esi // ff15???????? | // 8b442444 | mov eax, dword ptr [esp + 0x44] // 8b4c2448 | mov ecx, dword ptr [esp + 0x48] $sequence_3 = { 8b6c2418 56 57 8b7c2418 33db 57 50 } // n = 7, score = 100 // 8b6c2418 | mov ebp, dword ptr [esp + 0x18] // 56 | push esi // 57 | push edi // 8b7c2418 | mov edi, dword ptr [esp + 0x18] // 33db | xor ebx, ebx // 57 | push edi // 50 | push eax $sequence_4 = { 57 6a01 56 ff15???????? 8b442444 8b4c2448 03c7 } // n = 7, score = 100 // 57 | push edi // 6a01 | push 1 // 56 | push esi // ff15???????? | // 8b442444 | mov eax, dword ptr [esp + 0x44] // 8b4c2448 | mov ecx, dword ptr [esp + 0x48] // 03c7 | add eax, edi $sequence_5 = { 25ffff0000 50 8b44242a 51 } // n = 4, score = 100 // 25ffff0000 | and eax, 0xffff // 50 | push eax // 8b44242a | mov eax, dword ptr [esp + 0x2a] // 51 | push ecx $sequence_6 = { 8b4508 53 6a01 50 b9???????? e8???????? } // n = 6, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 6a01 | push 1 // 50 | push eax // b9???????? | // e8???????? | $sequence_7 = { 8965f0 66ab 53 53 aa 8a4510 51 } // n = 7, score = 100 // 8965f0 | mov dword ptr [ebp - 0x10], esp // 66ab | stosw word ptr es:[edi], ax // 53 | push ebx // 53 | push ebx // aa | stosb byte ptr es:[edi], al // 8a4510 | mov al, byte ptr [ebp + 0x10] // 51 | push ecx $sequence_8 = { 7d04 0430 eb02 0437 8801 } // n = 5, score = 100 // 7d04 | jge 6 // 0430 | add al, 0x30 // eb02 | jmp 4 // 0437 | add al, 0x37 // 8801 | mov byte ptr [ecx], al $sequence_9 = { 5e 5d 5b 7421 8b8424f8f40100 8d4c2400 50 } // n = 7, score = 100 // 5e | pop esi // 5d | pop ebp // 5b | pop ebx // 7421 | je 0x23 // 8b8424f8f40100 | mov eax, dword ptr [esp + 0x1f4f8] // 8d4c2400 | lea ecx, [esp] // 50 | push eax condition: 7 of them and filesize < 163840 }
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