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rule win_moonwind_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 57 0f87de010000 743d 83e802 7422 83e80e 0f85d5010000 } // n = 7, score = 100 // 57 | push edi // 0f87de010000 | ja 0x1e4 // 743d | je 0x3f // 83e802 | sub eax, 2 // 7422 | je 0x24 // 83e80e | sub eax, 0xe // 0f85d5010000 | jne 0x1db $sequence_1 = { 51 52 e8???????? 83c40c b001 8b4df0 64890d00000000 } // n = 7, score = 100 // 51 | push ecx // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc // b001 | mov al, 1 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_2 = { 58 8945ec e9???????? 6804000080 6a00 a1???????? 85c0 } // n = 7, score = 100 // 58 | pop eax // 8945ec | mov dword ptr [ebp - 0x14], eax // e9???????? | // 6804000080 | push 0x80000004 // 6a00 | push 0 // a1???????? | // 85c0 | test eax, eax $sequence_3 = { 83c410 33c9 3955e4 7f08 7c05 3945e0 7301 } // n = 7, score = 100 // 83c410 | add esp, 0x10 // 33c9 | xor ecx, ecx // 3955e4 | cmp dword ptr [ebp - 0x1c], edx // 7f08 | jg 0xa // 7c05 | jl 7 // 3945e0 | cmp dword ptr [ebp - 0x20], eax // 7301 | jae 3 $sequence_4 = { 83ec20 8b450c 56 6a00 6a20 6a03 6a00 } // n = 7, score = 100 // 83ec20 | sub esp, 0x20 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 56 | push esi // 6a00 | push 0 // 6a20 | push 0x20 // 6a03 | push 3 // 6a00 | push 0 $sequence_5 = { e8???????? c705????????02000000 c705????????01000000 c705????????00000000 e9???????? e9???????? c745fc00000000 } // n = 7, score = 100 // e8???????? | // c705????????02000000 | // c705????????01000000 | // c705????????00000000 | // e9???????? | // e9???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_6 = { e8???????? 83c410 894594 8b5d98 85db 7409 53 } // n = 7, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // 894594 | mov dword ptr [ebp - 0x6c], eax // 8b5d98 | mov ebx, dword ptr [ebp - 0x68] // 85db | test ebx, ebx // 7409 | je 0xb // 53 | push ebx $sequence_7 = { 8a45ca eb06 8b45c8 c1e818 3d9b000000 0f8775030000 33db } // n = 7, score = 100 // 8a45ca | mov al, byte ptr [ebp - 0x36] // eb06 | jmp 8 // 8b45c8 | mov eax, dword ptr [ebp - 0x38] // c1e818 | shr eax, 0x18 // 3d9b000000 | cmp eax, 0x9b // 0f8775030000 | ja 0x37b // 33db | xor ebx, ebx $sequence_8 = { 8903 e9???????? 8b5d08 8b1b 83c314 895db4 8b5db4 } // n = 7, score = 100 // 8903 | mov dword ptr [ebx], eax // e9???????? | // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b1b | mov ebx, dword ptr [ebx] // 83c314 | add ebx, 0x14 // 895db4 | mov dword ptr [ebp - 0x4c], ebx // 8b5db4 | mov ebx, dword ptr [ebp - 0x4c] $sequence_9 = { 8919 8b551c 891a 8b452c c70000000000 eb22 8b550c } // n = 7, score = 100 // 8919 | mov dword ptr [ecx], ebx // 8b551c | mov edx, dword ptr [ebp + 0x1c] // 891a | mov dword ptr [edx], ebx // 8b452c | mov eax, dword ptr [ebp + 0x2c] // c70000000000 | mov dword ptr [eax], 0 // eb22 | jmp 0x24 // 8b550c | mov edx, dword ptr [ebp + 0xc] condition: 7 of them and filesize < 1417216 }
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