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rule win_tabmsgsql_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 64892500000000 81ec18020000 53 56 57 33db b97f000000 } // n = 7, score = 100 // 64892500000000 | mov dword ptr fs:[0], esp // 81ec18020000 | sub esp, 0x218 // 53 | push ebx // 56 | push esi // 57 | push edi // 33db | xor ebx, ebx // b97f000000 | mov ecx, 0x7f $sequence_1 = { 0f84fb000000 83faff 0f84f2000000 bf???????? 83c9ff 33c0 } // n = 6, score = 100 // 0f84fb000000 | je 0x101 // 83faff | cmp edx, -1 // 0f84f2000000 | je 0xf8 // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_2 = { 5f 5e 5d 5b 7421 8b8424f8f40100 } // n = 6, score = 100 // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 5b | pop ebx // 7421 | je 0x23 // 8b8424f8f40100 | mov eax, dword ptr [esp + 0x1f4f8] $sequence_3 = { 3bfa 7536 fec8 8841ff 895304 } // n = 5, score = 100 // 3bfa | cmp edi, edx // 7536 | jne 0x38 // fec8 | dec al // 8841ff | mov byte ptr [ecx - 1], al // 895304 | mov dword ptr [ebx + 4], edx $sequence_4 = { 83d8ff 85c0 741b 57 8d442414 68???????? 50 } // n = 7, score = 100 // 83d8ff | sbb eax, -1 // 85c0 | test eax, eax // 741b | je 0x1d // 57 | push edi // 8d442414 | lea eax, [esp + 0x14] // 68???????? | // 50 | push eax $sequence_5 = { 8d45dc 68???????? 50 8d8dc8f7ffff 68???????? 51 ffd6 } // n = 7, score = 100 // 8d45dc | lea eax, [ebp - 0x24] // 68???????? | // 50 | push eax // 8d8dc8f7ffff | lea ecx, [ebp - 0x838] // 68???????? | // 51 | push ecx // ffd6 | call esi $sequence_6 = { 33c0 83c424 f2ae f7d1 49 5f 81f9a0860100 } // n = 7, score = 100 // 33c0 | xor eax, eax // 83c424 | add esp, 0x24 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 5f | pop edi // 81f9a0860100 | cmp ecx, 0x186a0 $sequence_7 = { 6a00 8d55dc 6a00 52 8d85940bfeff } // n = 5, score = 100 // 6a00 | push 0 // 8d55dc | lea edx, [ebp - 0x24] // 6a00 | push 0 // 52 | push edx // 8d85940bfeff | lea eax, [ebp - 0x1f46c] $sequence_8 = { 50 51 6a00 ff15???????? 85c0 7430 8d7c241c } // n = 7, score = 100 // 50 | push eax // 51 | push ecx // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 7430 | je 0x32 // 8d7c241c | lea edi, [esp + 0x1c] $sequence_9 = { 33c0 68???????? f2ae f7d1 2bf9 8d442434 8bd1 } // n = 7, score = 100 // 33c0 | xor eax, eax // 68???????? | // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx // 8d442434 | lea eax, [esp + 0x34] // 8bd1 | mov edx, ecx condition: 7 of them and filesize < 163840 }
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