Actor(s): Silent Chollima
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rule win_maui_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.maui." 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.maui" 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 = { a3???????? c705????????1b224100 c705????????fc184100 c705????????5e184100 c705????????eb174100 c3 8bff } // n = 7, score = 100 // a3???????? | // c705????????1b224100 | // c705????????fc184100 | // c705????????5e184100 | // c705????????eb174100 | // c3 | ret // 8bff | mov edi, edi $sequence_1 = { 81e6000000ff 33d6 8bf1 81e6ff000000 0fb634b5d0a14800 33d6 335508 } // n = 7, score = 100 // 81e6000000ff | and esi, 0xff000000 // 33d6 | xor edx, esi // 8bf1 | mov esi, ecx // 81e6ff000000 | and esi, 0xff // 0fb634b5d0a14800 | movzx esi, byte ptr [esi*4 + 0x48a1d0] // 33d6 | xor edx, esi // 335508 | xor edx, dword ptr [ebp + 8] $sequence_2 = { 5f 5e c3 56 8b742408 837e5c00 b801000000 } // n = 7, score = 100 // 5f | pop edi // 5e | pop esi // c3 | ret // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 837e5c00 | cmp dword ptr [esi + 0x5c], 0 // b801000000 | mov eax, 1 $sequence_3 = { 895c2428 55 8b6e08 03ed 03ed 0f8581000000 8b442428 } // n = 7, score = 100 // 895c2428 | mov dword ptr [esp + 0x28], ebx // 55 | push ebp // 8b6e08 | mov ebp, dword ptr [esi + 8] // 03ed | add ebp, ebp // 03ed | add ebp, ebp // 0f8581000000 | jne 0x87 // 8b442428 | mov eax, dword ptr [esp + 0x28] $sequence_4 = { 89442404 85ed 0f84c8020000 53 56 57 6a01 } // n = 7, score = 100 // 89442404 | mov dword ptr [esp + 4], eax // 85ed | test ebp, ebp // 0f84c8020000 | je 0x2ce // 53 | push ebx // 56 | push esi // 57 | push edi // 6a01 | push 1 $sequence_5 = { 03de 03d5 895c241c 85f6 7e2f 89742410 8bcd } // n = 7, score = 100 // 03de | add ebx, esi // 03d5 | add edx, ebp // 895c241c | mov dword ptr [esp + 0x1c], ebx // 85f6 | test esi, esi // 7e2f | jle 0x31 // 89742410 | mov dword ptr [esp + 0x10], esi // 8bcd | mov ecx, ebp $sequence_6 = { e8???????? 83c404 8d9b00000000 8b44245c 83f80a 7c0b bf0a000000 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 8d9b00000000 | lea ebx, [ebx] // 8b44245c | mov eax, dword ptr [esp + 0x5c] // 83f80a | cmp eax, 0xa // 7c0b | jl 0xd // bf0a000000 | mov edi, 0xa $sequence_7 = { 51 e8???????? 83c410 85c0 0f8e0b020000 8b4c2424 53 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 0f8e0b020000 | jle 0x211 // 8b4c2424 | mov ecx, dword ptr [esp + 0x24] // 53 | push ebx $sequence_8 = { 017e04 2bdf 817e04de050000 7e17 68???????? 68d9010000 68???????? } // n = 7, score = 100 // 017e04 | add dword ptr [esi + 4], edi // 2bdf | sub ebx, edi // 817e04de050000 | cmp dword ptr [esi + 4], 0x5de // 7e17 | jle 0x19 // 68???????? | // 68d9010000 | push 0x1d9 // 68???????? | $sequence_9 = { 2c89 4c 2408 89542410 } // n = 4, score = 100 // 2c89 | sub al, 0x89 // 4c | dec esp // 2408 | and al, 8 // 89542410 | mov dword ptr [esp + 0x10], edx condition: 7 of them and filesize < 1616896 }
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