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rule win_mulcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.mulcom." 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.mulcom" 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 = { 4883e2fc 483bd7 721c 4883c227 4c8b41f8 492bc8 488d41f8 } // n = 7, score = 100 // 4883e2fc | lea edx, [0x466a4] // 483bd7 | add ebx, 9 // 721c | inc esp // 4883c227 | mov eax, ebx // 4c8b41f8 | dec eax // 492bc8 | lea edx, [ebp + 0x40] // 488d41f8 | dec ecx $sequence_1 = { 488b41f0 48635004 488d0569950400 4889440af0 488b41f0 48635004 448d42f0 } // n = 7, score = 100 // 488b41f0 | dec esp // 48635004 | lea eax, [ebp - 0x48] // 488d0569950400 | dec eax // 4889440af0 | cmp dword ptr [ebp - 0x30], 0x10 // 488b41f0 | dec esp // 48635004 | cmovae eax, dword ptr [ebp - 0x48] // 448d42f0 | inc eax $sequence_2 = { 33d2 41b8d8020000 488d4df0 e8???????? 4c8b4310 488bd3 48837b1808 } // n = 7, score = 100 // 33d2 | jne 0xe26 // 41b8d8020000 | dec eax // 488d4df0 | mov dword ptr [ebx + 0x10], edx // e8???????? | // 4c8b4310 | dec eax // 488bd3 | lea edi, [0x4b856] // 48837b1808 | mov esi, 6 $sequence_3 = { 85c9 7e2d 483bd8 488beb 498bd6 498bc9 480f4de8 } // n = 7, score = 100 // 85c9 | dec eax // 7e2d | mov edi, dword ptr [esp + 0x40] // 483bd8 | dec eax // 488beb | add esp, 0x20 // 498bd6 | inc ecx // 498bc9 | pop edi // 480f4de8 | dec eax $sequence_4 = { c7811807000080000000 488d0dc65a0400 ff15???????? 408ac6 488b4c2440 } // n = 5, score = 100 // c7811807000080000000 | dec eax // 488d0dc65a0400 | lea ecx, [0x2e065] // ff15???????? | // 408ac6 | dec eax // 488b4c2440 | mov eax, dword ptr [ebp - 0x28] $sequence_5 = { 488b5d88 4885db 0f846b060000 4885c0 0f8462060000 33c0 } // n = 6, score = 100 // 488b5d88 | dec ecx // 4885db | dec esi // 0f846b060000 | call dword ptr [eax + 0x18] // 4885c0 | inc esp // 0f8462060000 | movzx eax, ax // 33c0 | inc bp $sequence_6 = { 488d15a0570200 488bcb 488905???????? ff15???????? 483305???????? 488d15a2570200 488bcb } // n = 7, score = 100 // 488d15a0570200 | lea eax, [ecx + 0x10] // 488bcb | movups xmmword ptr [ecx], xmm0 // 488905???????? | // ff15???????? | // 483305???????? | // 488d15a2570200 | mov eax, dword ptr [ebp - 0x31] // 488bcb | mov dword ptr [ecx + 0x10], eax $sequence_7 = { 4c8be8 4d85f6 741b 498b16 498bce ff5210 4885c0 } // n = 7, score = 100 // 4c8be8 | mov ecx, dword ptr [ebp + 0x160] // 4d85f6 | dec eax // 741b | mov eax, ecx // 498b16 | inc ecx // 498bce | mov esp, 1 // ff5210 | dec esp // 4885c0 | lea edi, [0x15dcd] $sequence_8 = { 4983e901 75e7 33c9 85c9 740f 4883c002 eba5 } // n = 7, score = 100 // 4983e901 | mov ebx, ecx // 75e7 | dec esp // 33c9 | lea ecx, [0x231c1] // 85c9 | mov ecx, 2 // 740f | dec esp // 4883c002 | lea eax, [0x231ad] // eba5 | dec eax $sequence_9 = { 55 56 4881ec90000000 418bd9 4d8bd8 488bf2 488be9 } // n = 7, score = 100 // 55 | inc esp // 56 | mov dh, al // 4881ec90000000 | mov al, byte ptr [edi] // 418bd9 | jmp 0x107 // 4d8bd8 | test al, al // 488bf2 | jle 0x10b // 488be9 | dec eax condition: 7 of them and filesize < 867328 }
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