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rule win_mongall_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.mongall." 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.mongall" 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 = { ff15???????? 8b400c 8b08 8b11 52 ff15???????? ba???????? } // n = 7, score = 100 // ff15???????? | // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b08 | mov ecx, dword ptr [eax] // 8b11 | mov edx, dword ptr [ecx] // 52 | push edx // ff15???????? | // ba???????? | $sequence_1 = { 85ff 747c 56 57 68???????? e8???????? 68???????? } // n = 7, score = 100 // 85ff | test edi, edi // 747c | je 0x7e // 56 | push esi // 57 | push edi // 68???????? | // e8???????? | // 68???????? | $sequence_2 = { f3a5 8bc8 8b8500d9ffff 83e103 43 } // n = 5, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 8b8500d9ffff | mov eax, dword ptr [ebp - 0x2700] // 83e103 | and ecx, 3 // 43 | inc ebx $sequence_3 = { 59 8985a0fdffff 3bc1 0f87cb090000 ff2485e6574000 838de8fdffffff 89b594fdffff } // n = 7, score = 100 // 59 | pop ecx // 8985a0fdffff | mov dword ptr [ebp - 0x260], eax // 3bc1 | cmp eax, ecx // 0f87cb090000 | ja 0x9d1 // ff2485e6574000 | jmp dword ptr [eax*4 + 0x4057e6] // 838de8fdffffff | or dword ptr [ebp - 0x218], 0xffffffff // 89b594fdffff | mov dword ptr [ebp - 0x26c], esi $sequence_4 = { 8bd8 83fbff 7448 68???????? e8???????? } // n = 5, score = 100 // 8bd8 | mov ebx, eax // 83fbff | cmp ebx, -1 // 7448 | je 0x4a // 68???????? | // e8???????? | $sequence_5 = { e8???????? 8bfc 85ff 741d 8b8df4fdffff 56 } // n = 6, score = 100 // e8???????? | // 8bfc | mov edi, esp // 85ff | test edi, edi // 741d | je 0x1f // 8b8df4fdffff | mov ecx, dword ptr [ebp - 0x20c] // 56 | push esi $sequence_6 = { 56 8d45f0 33f6 50 8935???????? 8935???????? ff15???????? } // n = 7, score = 100 // 56 | push esi // 8d45f0 | lea eax, [ebp - 0x10] // 33f6 | xor esi, esi // 50 | push eax // 8935???????? | // 8935???????? | // ff15???????? | $sequence_7 = { 8b7df0 8bc7 5f 5e c60300 } // n = 5, score = 100 // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 8bc7 | mov eax, edi // 5f | pop edi // 5e | pop esi // c60300 | mov byte ptr [ebx], 0 $sequence_8 = { 89b5e4fdffff 89b5e0fdffff 89b5c0fdffff 888deffdffff } // n = 4, score = 100 // 89b5e4fdffff | mov dword ptr [ebp - 0x21c], esi // 89b5e0fdffff | mov dword ptr [ebp - 0x220], esi // 89b5c0fdffff | mov dword ptr [ebp - 0x240], esi // 888deffdffff | mov byte ptr [ebp - 0x211], cl $sequence_9 = { 85f6 5e 741d 8d85f8feffff } // n = 4, score = 100 // 85f6 | test esi, esi // 5e | pop esi // 741d | je 0x1f // 8d85f8feffff | lea eax, [ebp - 0x108] condition: 7 of them and filesize < 199680 }
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