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rule win_dairy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 5b 81c48c050000 c3 668b15???????? } // n = 4, score = 100 // 5b | pop ebx // 81c48c050000 | add esp, 0x58c // c3 | ret // 668b15???????? | $sequence_1 = { 7e08 3c41 7c7e 3c5a 7f7a } // n = 5, score = 100 // 7e08 | jle 0xa // 3c41 | cmp al, 0x41 // 7c7e | jl 0x80 // 3c5a | cmp al, 0x5a // 7f7a | jg 0x7c $sequence_2 = { 33f3 8b5c2414 03c6 8bf0 c1ee05 03f3 8bd8 } // n = 7, score = 100 // 33f3 | xor esi, ebx // 8b5c2414 | mov ebx, dword ptr [esp + 0x14] // 03c6 | add eax, esi // 8bf0 | mov esi, eax // c1ee05 | shr esi, 5 // 03f3 | add esi, ebx // 8bd8 | mov ebx, eax $sequence_3 = { e8???????? 895c2420 8b4d0c 8d442420 6a04 50 51 } // n = 7, score = 100 // e8???????? | // 895c2420 | mov dword ptr [esp + 0x20], ebx // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8d442420 | lea eax, [esp + 0x20] // 6a04 | push 4 // 50 | push eax // 51 | push ecx $sequence_4 = { 8b542464 51 52 e8???????? 83c408 895c246c e9???????? } // n = 7, score = 100 // 8b542464 | mov edx, dword ptr [esp + 0x64] // 51 | push ecx // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 895c246c | mov dword ptr [esp + 0x6c], ebx // e9???????? | $sequence_5 = { 83c408 eb2f 8bb42438030000 8d842430010000 } // n = 4, score = 100 // 83c408 | add esp, 8 // eb2f | jmp 0x31 // 8bb42438030000 | mov esi, dword ptr [esp + 0x338] // 8d842430010000 | lea eax, [esp + 0x130] $sequence_6 = { 52 ff5040 895c2428 81fe18030980 0f8495feffff } // n = 5, score = 100 // 52 | push edx // ff5040 | call dword ptr [eax + 0x40] // 895c2428 | mov dword ptr [esp + 0x28], ebx // 81fe18030980 | cmp esi, 0x80090318 // 0f8495feffff | je 0xfffffe9b $sequence_7 = { c644241169 c644241264 c64424133a c644241400 f2ae f7d1 2bf9 } // n = 7, score = 100 // c644241169 | mov byte ptr [esp + 0x11], 0x69 // c644241264 | mov byte ptr [esp + 0x12], 0x64 // c64424133a | mov byte ptr [esp + 0x13], 0x3a // c644241400 | mov byte ptr [esp + 0x14], 0 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx $sequence_8 = { 8b38 8bd1 c1e902 f3a5 8bca 68???????? 83e103 } // n = 7, score = 100 // 8b38 | mov edi, dword ptr [eax] // 8bd1 | mov edx, ecx // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bca | mov ecx, edx // 68???????? | // 83e103 | and ecx, 3 $sequence_9 = { 894c2420 f3ab 8b8424401c0000 50 6a00 6810040000 ff15???????? } // n = 7, score = 100 // 894c2420 | mov dword ptr [esp + 0x20], ecx // f3ab | rep stosd dword ptr es:[edi], eax // 8b8424401c0000 | mov eax, dword ptr [esp + 0x1c40] // 50 | push eax // 6a00 | push 0 // 6810040000 | push 0x410 // ff15???????? | condition: 7 of them and filesize < 212992 }
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