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rule win_moonwind_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 85db 7516 8b542410 52 ffd5 83c0fe 83f803 } // n = 7, score = 100 // 85db | test ebx, ebx // 7516 | jne 0x18 // 8b542410 | mov edx, dword ptr [esp + 0x10] // 52 | push edx // ffd5 | call ebp // 83c0fe | add eax, -2 // 83f803 | cmp eax, 3 $sequence_1 = { 6802000000 bba4010000 e8???????? 83c41c 894588 6805000080 6a00 } // n = 7, score = 100 // 6802000000 | push 2 // bba4010000 | mov ebx, 0x1a4 // e8???????? | // 83c41c | add esp, 0x1c // 894588 | mov dword ptr [ebp - 0x78], eax // 6805000080 | push 0x80000005 // 6a00 | push 0 $sequence_2 = { 59 e9???????? 83c40c 8b45f0 85c0 7415 50 } // n = 7, score = 100 // 59 | pop ecx // e9???????? | // 83c40c | add esp, 0xc // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 85c0 | test eax, eax // 7415 | je 0x17 // 50 | push eax $sequence_3 = { 81ec3c000000 c745fc00000000 6808000000 e8???????? 83c404 8945f8 8bf8 } // n = 7, score = 100 // 81ec3c000000 | sub esp, 0x3c // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 6808000000 | push 8 // e8???????? | // 83c404 | add esp, 4 // 8945f8 | mov dword ptr [ebp - 8], eax // 8bf8 | mov edi, eax $sequence_4 = { eb05 b800000000 85c0 0f8443000000 8b5d08 8b1b 83c304 } // n = 7, score = 100 // eb05 | jmp 7 // b800000000 | mov eax, 0 // 85c0 | test eax, eax // 0f8443000000 | je 0x49 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b1b | mov ebx, dword ptr [ebx] // 83c304 | add ebx, 4 $sequence_5 = { 83c9ff 33c0 8b5c2430 f2ae f7d1 49 bf???????? } // n = 7, score = 100 // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 8b5c2430 | mov ebx, dword ptr [esp + 0x30] // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // bf???????? | $sequence_6 = { 8b1b 83c374 895df4 8b5df4 8b03 3945fc 0f8f75030000 } // n = 7, score = 100 // 8b1b | mov ebx, dword ptr [ebx] // 83c374 | add ebx, 0x74 // 895df4 | mov dword ptr [ebp - 0xc], ebx // 8b5df4 | mov ebx, dword ptr [ebp - 0xc] // 8b03 | mov eax, dword ptr [ebx] // 3945fc | cmp dword ptr [ebp - 4], eax // 0f8f75030000 | jg 0x37b $sequence_7 = { 83c404 8b5de0 895dc4 8b5d08 8b1b 8b5b38 } // n = 6, score = 100 // 83c404 | add esp, 4 // 8b5de0 | mov ebx, dword ptr [ebp - 0x20] // 895dc4 | mov dword ptr [ebp - 0x3c], ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b1b | mov ebx, dword ptr [ebx] // 8b5b38 | mov ebx, dword ptr [ebx + 0x38] $sequence_8 = { 83c408 8945ac 8b45ac 50 8b5db4 85db 7409 } // n = 7, score = 100 // 83c408 | add esp, 8 // 8945ac | mov dword ptr [ebp - 0x54], eax // 8b45ac | mov eax, dword ptr [ebp - 0x54] // 50 | push eax // 8b5db4 | mov ebx, dword ptr [ebp - 0x4c] // 85db | test ebx, ebx // 7409 | je 0xb $sequence_9 = { 83784004 7414 83c054 68???????? 50 e8???????? 83c408 } // n = 7, score = 100 // 83784004 | cmp dword ptr [eax + 0x40], 4 // 7414 | je 0x16 // 83c054 | add eax, 0x54 // 68???????? | // 50 | push eax // e8???????? | // 83c408 | add esp, 8 condition: 7 of them and filesize < 1417216 }
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