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rule win_moonwind_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.moonwind." 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.moonwind" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b11 83c104 c1ea08 881430 8a51fc 40 881430 } // n = 7, score = 100 // 8b11 | mov edx, dword ptr [ecx] // 83c104 | add ecx, 4 // c1ea08 | shr edx, 8 // 881430 | mov byte ptr [eax + esi], dl // 8a51fc | mov dl, byte ptr [ecx - 4] // 40 | inc eax // 881430 | mov byte ptr [eax + esi], dl $sequence_1 = { 8b5dfc 895de4 8b5de4 66c7030200 8b5dfc 83c308 895de4 } // n = 7, score = 100 // 8b5dfc | mov ebx, dword ptr [ebp - 4] // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 8b5de4 | mov ebx, dword ptr [ebp - 0x1c] // 66c7030200 | mov word ptr [ebx], 2 // 8b5dfc | mov ebx, dword ptr [ebp - 4] // 83c308 | add ebx, 8 // 895de4 | mov dword ptr [ebp - 0x1c], ebx $sequence_2 = { 53 e8???????? 83c404 8b5d08 8b1b 81c390000000 895dec } // n = 7, score = 100 // 53 | push ebx // e8???????? | // 83c404 | add esp, 4 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b1b | mov ebx, dword ptr [ebx] // 81c390000000 | add ebx, 0x90 // 895dec | mov dword ptr [ebp - 0x14], ebx $sequence_3 = { e8???????? 83c404 83c734 33d2 83c8ff 8917 885704 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 83c734 | add edi, 0x34 // 33d2 | xor edx, edx // 83c8ff | or eax, 0xffffffff // 8917 | mov dword ptr [edi], edx // 885704 | mov byte ptr [edi + 4], dl $sequence_4 = { b801000000 eb05 b800000000 85c0 0f842f000000 8b5d08 8b1b } // n = 7, score = 100 // b801000000 | mov eax, 1 // eb05 | jmp 7 // b800000000 | mov eax, 0 // 85c0 | test eax, eax // 0f842f000000 | je 0x35 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b1b | mov ebx, dword ptr [ebx] $sequence_5 = { bbdc090000 e8???????? 83c410 8945b8 8b5dbc 85db 7409 } // n = 7, score = 100 // bbdc090000 | mov ebx, 0x9dc // e8???????? | // 83c410 | add esp, 0x10 // 8945b8 | mov dword ptr [ebp - 0x48], eax // 8b5dbc | mov ebx, dword ptr [ebp - 0x44] // 85db | test ebx, ebx // 7409 | je 0xb $sequence_6 = { ff75fc 6801000000 bb68010000 e8???????? 83c410 8945f0 68???????? } // n = 7, score = 100 // ff75fc | push dword ptr [ebp - 4] // 6801000000 | push 1 // bb68010000 | mov ebx, 0x168 // e8???????? | // 83c410 | add esp, 0x10 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 68???????? | $sequence_7 = { 8965f4 8b5d08 ff33 6801000000 ff75f8 ff15???????? } // n = 6, score = 100 // 8965f4 | mov dword ptr [ebp - 0xc], esp // 8b5d08 | mov ebx, dword ptr [ebp + 8] // ff33 | push dword ptr [ebx] // 6801000000 | push 1 // ff75f8 | push dword ptr [ebp - 8] // ff15???????? | $sequence_8 = { 50 e8???????? 8d7c2434 83c9ff 33c0 83c40c f2ae } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8d7c2434 | lea edi, [esp + 0x34] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 83c40c | add esp, 0xc // f2ae | repne scasb al, byte ptr es:[edi] $sequence_9 = { dc25???????? dd5dc4 6801030080 6a00 682c000000 dd45c4 e8???????? } // n = 7, score = 100 // dc25???????? | // dd5dc4 | fstp qword ptr [ebp - 0x3c] // 6801030080 | push 0x80000301 // 6a00 | push 0 // 682c000000 | push 0x2c // dd45c4 | fld qword ptr [ebp - 0x3c] // e8???????? | condition: 7 of them and filesize < 1417216 }
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