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rule win_goopic_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.goopic." 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.goopic" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { ff5158 8b442410 ff742430 50 8b08 } // n = 5, score = 100 // ff5158 | call dword ptr [ecx + 0x58] // 8b442410 | mov eax, dword ptr [esp + 0x10] // ff742430 | push dword ptr [esp + 0x30] // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] $sequence_1 = { 68???????? ff15???????? 8d85f8f7ffff 50 6a02 } // n = 5, score = 100 // 68???????? | // ff15???????? | // 8d85f8f7ffff | lea eax, [ebp - 0x808] // 50 | push eax // 6a02 | push 2 $sequence_2 = { ff15???????? 83bdf0efffff00 7409 83bdf8efffff00 77a4 } // n = 5, score = 100 // ff15???????? | // 83bdf0efffff00 | cmp dword ptr [ebp - 0x1010], 0 // 7409 | je 0xb // 83bdf8efffff00 | cmp dword ptr [ebp - 0x1008], 0 // 77a4 | ja 0xffffffa6 $sequence_3 = { 751d 6683bdfcfeffff37 7513 b801000000 8b4dfc 33cd } // n = 6, score = 100 // 751d | jne 0x1f // 6683bdfcfeffff37 | cmp word ptr [ebp - 0x104], 0x37 // 7513 | jne 0x15 // b801000000 | mov eax, 1 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp $sequence_4 = { 8945fc 57 6a52 6a40 ff15???????? 8bf8 } // n = 6, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 57 | push edi // 6a52 | push 0x52 // 6a40 | push 0x40 // ff15???????? | // 8bf8 | mov edi, eax $sequence_5 = { 68???????? 8d85fcf7ffff 50 ff15???????? 6a02 68???????? ff15???????? } // n = 7, score = 100 // 68???????? | // 8d85fcf7ffff | lea eax, [ebp - 0x804] // 50 | push eax // ff15???????? | // 6a02 | push 2 // 68???????? | // ff15???????? | $sequence_6 = { 744b 83f873 7446 83f874 } // n = 4, score = 100 // 744b | je 0x4d // 83f873 | cmp eax, 0x73 // 7446 | je 0x48 // 83f874 | cmp eax, 0x74 $sequence_7 = { 8d4910 660f70c000 83c004 660ffec1 f30f7f41f0 3d00010000 7ce1 } // n = 7, score = 100 // 8d4910 | lea ecx, [ecx + 0x10] // 660f70c000 | pshufd xmm0, xmm0, 0 // 83c004 | add eax, 4 // 660ffec1 | paddd xmm0, xmm1 // f30f7f41f0 | movdqu xmmword ptr [ecx - 0x10], xmm0 // 3d00010000 | cmp eax, 0x100 // 7ce1 | jl 0xffffffe3 $sequence_8 = { 7cb2 33ff 397d08 766e 41 81e1ff000080 } // n = 6, score = 100 // 7cb2 | jl 0xffffffb4 // 33ff | xor edi, edi // 397d08 | cmp dword ptr [ebp + 8], edi // 766e | jbe 0x70 // 41 | inc ecx // 81e1ff000080 | and ecx, 0x800000ff $sequence_9 = { a3???????? 85c0 750a ff742424 ff15???????? } // n = 5, score = 100 // a3???????? | // 85c0 | test eax, eax // 750a | jne 0xc // ff742424 | push dword ptr [esp + 0x24] // ff15???????? | condition: 7 of them and filesize < 114688 }
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