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rule win_moker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.moker." 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.moker" 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 = { 0302 8945d4 8b4dd4 83c102 } // n = 4, score = 200 // 0302 | add eax, dword ptr [edx] // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 83c102 | add ecx, 2 $sequence_1 = { 0302 8945e8 eb09 8b45e8 } // n = 4, score = 200 // 0302 | add eax, dword ptr [edx] // 8945e8 | mov dword ptr [ebp - 0x18], eax // eb09 | jmp 0xb // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_2 = { 0302 8945e8 8b4df8 8b55fc } // n = 4, score = 200 // 0302 | add eax, dword ptr [edx] // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_3 = { 0302 50 e8???????? 83c404 3b450c 750b 8b4df0 } // n = 7, score = 200 // 0302 | add eax, dword ptr [edx] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 750b | jne 0xd // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] $sequence_4 = { 0301 8945e0 e8???????? 8b55e8 } // n = 4, score = 200 // 0301 | add eax, dword ptr [ecx] // 8945e0 | mov dword ptr [ebp - 0x20], eax // e8???????? | // 8b55e8 | mov edx, dword ptr [ebp - 0x18] $sequence_5 = { 0302 8945dc 8b45dc 83c002 } // n = 4, score = 200 // 0302 | add eax, dword ptr [edx] // 8945dc | mov dword ptr [ebp - 0x24], eax // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 83c002 | add eax, 2 $sequence_6 = { 6a00 6a04 6a01 68000000c0 } // n = 4, score = 200 // 6a00 | push 0 // 6a04 | push 4 // 6a01 | push 1 // 68000000c0 | push 0xc0000000 $sequence_7 = { 0100 83c414 85c0 7502 eb0a } // n = 5, score = 200 // 0100 | add dword ptr [eax], eax // 83c414 | add esp, 0x14 // 85c0 | test eax, eax // 7502 | jne 4 // eb0a | jmp 0xc $sequence_8 = { 89e5 ff7508 ed 2e5c 034508 } // n = 5, score = 100 // 89e5 | mov ebp, esp // ff7508 | push dword ptr [ebp + 8] // ed | in eax, dx // 2e5c | pop esp // 034508 | add eax, dword ptr [ebp + 8] $sequence_9 = { 48 8b7c2428 48 39f7 7413 fc } // n = 6, score = 100 // 48 | dec eax // 8b7c2428 | mov edi, dword ptr [esp + 0x28] // 48 | dec eax // 39f7 | cmp edi, esi // 7413 | je 0x15 // fc | cld $sequence_10 = { 49 8b4c2408 ffd0 48 } // n = 4, score = 100 // 49 | dec ecx // 8b4c2408 | mov ecx, dword ptr [esp + 8] // ffd0 | call eax // 48 | dec eax $sequence_11 = { d16000 d0806200a501 40 00b070e000e0 31e0 00d5 31c0 } // n = 7, score = 100 // d16000 | shl dword ptr [eax], 1 // d0806200a501 | rol byte ptr [eax + 0x1a50062], 1 // 40 | inc eax // 00b070e000e0 | add byte ptr [eax - 0x1fff1f90], dh // 31e0 | xor eax, esp // 00d5 | add ch, dl // 31c0 | xor eax, eax $sequence_12 = { 880424 49 89442430 49 89742458 66813e4d5a } // n = 6, score = 100 // 880424 | mov byte ptr [esp], al // 49 | dec ecx // 89442430 | mov dword ptr [esp + 0x30], eax // 49 | dec ecx // 89742458 | mov dword ptr [esp + 0x58], esi // 66813e4d5a | cmp word ptr [esi], 0x5a4d $sequence_13 = { 50 51 52 48 } // n = 4, score = 100 // 50 | push eax // 51 | push ecx // 52 | push edx // 48 | dec eax $sequence_14 = { c20800 55 89e5 ff750c ed } // n = 5, score = 100 // c20800 | ret 8 // 55 | push ebp // 89e5 | mov ebp, esp // ff750c | push dword ptr [ebp + 0xc] // ed | in eax, dx $sequence_15 = { 89e5 60 8b7d08 6887000000 ed } // n = 5, score = 100 // 89e5 | mov ebp, esp // 60 | pushal // 8b7d08 | mov edi, dword ptr [ebp + 8] // 6887000000 | push 0x87 // ed | in eax, dx condition: 7 of them and filesize < 1761280 }
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