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rule win_dairy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.dairy." 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.dairy" 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 = { 52 51 ff15???????? 85c0 741a e9???????? } // n = 6, score = 100 // 52 | push edx // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 741a | je 0x1c // e9???????? | $sequence_1 = { 6a61 b932000000 33c0 8dbc2480030000 6a74 6a61 6a64 } // n = 7, score = 100 // 6a61 | push 0x61 // b932000000 | mov ecx, 0x32 // 33c0 | xor eax, eax // 8dbc2480030000 | lea edi, [esp + 0x380] // 6a74 | push 0x74 // 6a61 | push 0x61 // 6a64 | push 0x64 $sequence_2 = { 8b0d???????? 56 ff5110 8b542414 } // n = 4, score = 100 // 8b0d???????? | // 56 | push esi // ff5110 | call dword ptr [ecx + 0x10] // 8b542414 | mov edx, dword ptr [esp + 0x14] $sequence_3 = { 53 8b5c2410 55 56 57 8bfb 33f6 } // n = 7, score = 100 // 53 | push ebx // 8b5c2410 | mov ebx, dword ptr [esp + 0x10] // 55 | push ebp // 56 | push esi // 57 | push edi // 8bfb | mov edi, ebx // 33f6 | xor esi, esi $sequence_4 = { 51 e8???????? 83c418 85c0 0f8e4f010000 8b550c 6800040000 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax // 0f8e4f010000 | jle 0x155 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 6800040000 | push 0x400 $sequence_5 = { b900020000 33c0 8dbc2420020000 f3ab } // n = 4, score = 100 // b900020000 | mov ecx, 0x200 // 33c0 | xor eax, eax // 8dbc2420020000 | lea edi, [esp + 0x220] // f3ab | rep stosd dword ptr es:[edi], eax $sequence_6 = { 68???????? 51 e8???????? 83c40c 85c0 0f85bb000000 } // n = 6, score = 100 // 68???????? | // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 0f85bb000000 | jne 0xc1 $sequence_7 = { 0f8ecefeffff bf???????? 83c9ff 33c0 f2ae f7d1 49 } // n = 7, score = 100 // 0f8ecefeffff | jle 0xfffffed4 // bf???????? | // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx $sequence_8 = { 55 56 8b742420 8b44241c } // n = 4, score = 100 // 55 | push ebp // 56 | push esi // 8b742420 | mov esi, dword ptr [esp + 0x20] // 8b44241c | mov eax, dword ptr [esp + 0x1c] $sequence_9 = { 7437 8b442448 6a40 50 ffd6 } // n = 5, score = 100 // 7437 | je 0x39 // 8b442448 | mov eax, dword ptr [esp + 0x48] // 6a40 | push 0x40 // 50 | push eax // ffd6 | call esi condition: 7 of them and filesize < 212992 }
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