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rule win_mofksys_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.mofksys." 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.mofksys" 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 = { 50 e8???????? 8bd0 8d4de8 ffd6 8d8d60ffffff } // n = 6, score = 100 // 50 | push eax // e8???????? | // 8bd0 | mov edx, eax // 8d4de8 | lea ecx, [ebp - 0x18] // ffd6 | call esi // 8d8d60ffffff | lea ecx, [ebp - 0xa0] $sequence_1 = { 894dd4 c745fc07000000 8b55d8 52 e8???????? ff15???????? 8b45d4 } // n = 7, score = 100 // 894dd4 | mov dword ptr [ebp - 0x2c], ecx // c745fc07000000 | mov dword ptr [ebp - 4], 7 // 8b55d8 | mov edx, dword ptr [ebp - 0x28] // 52 | push edx // e8???????? | // ff15???????? | // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] $sequence_2 = { 83c40c c745fca1000000 ba???????? 8d4dc0 ff15???????? 8d4dc0 51 } // n = 7, score = 100 // 83c40c | add esp, 0xc // c745fca1000000 | mov dword ptr [ebp - 4], 0xa1 // ba???????? | // 8d4dc0 | lea ecx, [ebp - 0x40] // ff15???????? | // 8d4dc0 | lea ecx, [ebp - 0x40] // 51 | push ecx $sequence_3 = { f7de 3bf0 7209 ff15???????? 8b4dc0 8b4118 0fafc6 } // n = 7, score = 100 // f7de | neg esi // 3bf0 | cmp esi, eax // 7209 | jb 0xb // ff15???????? | // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 8b4118 | mov eax, dword ptr [ecx + 0x18] // 0fafc6 | imul eax, esi $sequence_4 = { ff15???????? 83c410 c745fc65000000 ba???????? 8d4dcc ff15???????? a1???????? } // n = 7, score = 100 // ff15???????? | // 83c410 | add esp, 0x10 // c745fc65000000 | mov dword ptr [ebp - 4], 0x65 // ba???????? | // 8d4dcc | lea ecx, [ebp - 0x34] // ff15???????? | // a1???????? | $sequence_5 = { ff15???????? 8bd0 8d8d7cfcffff ffd6 50 ffd7 } // n = 6, score = 100 // ff15???????? | // 8bd0 | mov edx, eax // 8d8d7cfcffff | lea ecx, [ebp - 0x384] // ffd6 | call esi // 50 | push eax // ffd7 | call edi $sequence_6 = { a1???????? 8b4de4 50 51 ffd7 8bd0 8d4da8 } // n = 7, score = 100 // a1???????? | // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 50 | push eax // 51 | push ecx // ffd7 | call edi // 8bd0 | mov edx, eax // 8d4da8 | lea ecx, [ebp - 0x58] $sequence_7 = { 3bc3 7d12 68e0000000 68???????? 56 50 } // n = 6, score = 100 // 3bc3 | cmp eax, ebx // 7d12 | jge 0x14 // 68e0000000 | push 0xe0 // 68???????? | // 56 | push esi // 50 | push eax $sequence_8 = { 83c201 0f80b2080000 52 8b45d0 50 68???????? } // n = 6, score = 100 // 83c201 | add edx, 1 // 0f80b2080000 | jo 0x8b8 // 52 | push edx // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 50 | push eax // 68???????? | $sequence_9 = { e8???????? 8d4ddc ff15???????? c745fc0f000000 68???????? 6a00 ff15???????? } // n = 7, score = 100 // e8???????? | // 8d4ddc | lea ecx, [ebp - 0x24] // ff15???????? | // c745fc0f000000 | mov dword ptr [ebp - 4], 0xf // 68???????? | // 6a00 | push 0 // ff15???????? | condition: 7 of them and filesize < 401408 }
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