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rule win_mongall_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 7415 ff85e4fdffff 83bde4fdffffff 740d 85f6 7fdf } // n = 6, score = 100 // 7415 | je 0x17 // ff85e4fdffff | inc dword ptr [ebp - 0x21c] // 83bde4fdffffff | cmp dword ptr [ebp - 0x21c], -1 // 740d | je 0xf // 85f6 | test esi, esi // 7fdf | jg 0xffffffe1 $sequence_1 = { 33f6 50 8935???????? 8935???????? } // n = 4, score = 100 // 33f6 | xor esi, esi // 50 | push eax // 8935???????? | // 8935???????? | $sequence_2 = { 50 53 8d95f8fdffff e8???????? } // n = 4, score = 100 // 50 | push eax // 53 | push ebx // 8d95f8fdffff | lea edx, [ebp - 0x208] // e8???????? | $sequence_3 = { c3 8d5801 53 e8???????? 53 8bf0 6a00 } // n = 7, score = 100 // c3 | ret // 8d5801 | lea ebx, [eax + 1] // 53 | push ebx // e8???????? | // 53 | push ebx // 8bf0 | mov esi, eax // 6a00 | push 0 $sequence_4 = { c1e006 030495603f4100 eb05 b8???????? f6400420 7414 6a02 } // n = 7, score = 100 // c1e006 | shl eax, 6 // 030495603f4100 | add eax, dword ptr [edx*4 + 0x413f60] // eb05 | jmp 7 // b8???????? | // f6400420 | test byte ptr [eax + 4], 0x20 // 7414 | je 0x16 // 6a02 | push 2 $sequence_5 = { 52 8985f8fdffff 898decfdffff c685fcfdffff00 e8???????? 8bc6 83c40c } // n = 7, score = 100 // 52 | push edx // 8985f8fdffff | mov dword ptr [ebp - 0x208], eax // 898decfdffff | mov dword ptr [ebp - 0x214], ecx // c685fcfdffff00 | mov byte ptr [ebp - 0x204], 0 // e8???????? | // 8bc6 | mov eax, esi // 83c40c | add esp, 0xc $sequence_6 = { 0f8fe8000000 747d 83e841 7410 48 48 } // n = 6, score = 100 // 0f8fe8000000 | jg 0xee // 747d | je 0x7f // 83e841 | sub eax, 0x41 // 7410 | je 0x12 // 48 | dec eax // 48 | dec eax $sequence_7 = { 899d98fdffff 8bf0 8bda 83f939 7e06 038dbcfdffff 880f } // n = 7, score = 100 // 899d98fdffff | mov dword ptr [ebp - 0x268], ebx // 8bf0 | mov esi, eax // 8bda | mov ebx, edx // 83f939 | cmp ecx, 0x39 // 7e06 | jle 8 // 038dbcfdffff | add ecx, dword ptr [ebp - 0x244] // 880f | mov byte ptr [edi], cl $sequence_8 = { ff15???????? 8b4d0c 50 8b85f8feffff 50 8d95fcfeffff } // n = 6, score = 100 // ff15???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 50 | push eax // 8b85f8feffff | mov eax, dword ptr [ebp - 0x108] // 50 | push eax // 8d95fcfeffff | lea edx, [ebp - 0x104] $sequence_9 = { 56 50 e8???????? 8d4df0 51 e8???????? 83c410 } // n = 7, score = 100 // 56 | push esi // 50 | push eax // e8???????? | // 8d4df0 | lea ecx, [ebp - 0x10] // 51 | push ecx // e8???????? | // 83c410 | add esp, 0x10 condition: 7 of them and filesize < 199680 }
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