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rule win_goopic_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 ff15???????? 8d85f8b7ffff 50 6a00 6a00 6a06 } // n = 7, score = 100 // 50 | push eax // ff15???????? | // 8d85f8b7ffff | lea eax, [ebp - 0x4808] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 6a06 | push 6 $sequence_1 = { 6a00 68???????? ff742420 ff15???????? ff74240c ff15???????? 6a00 } // n = 7, score = 100 // 6a00 | push 0 // 68???????? | // ff742420 | push dword ptr [esp + 0x20] // ff15???????? | // ff74240c | push dword ptr [esp + 0xc] // ff15???????? | // 6a00 | push 0 $sequence_2 = { 0f85e8010000 8b7e3c 03fe 813f50450000 0f85d7010000 } // n = 5, score = 100 // 0f85e8010000 | jne 0x1ee // 8b7e3c | mov edi, dword ptr [esi + 0x3c] // 03fe | add edi, esi // 813f50450000 | cmp dword ptr [edi], 0x4550 // 0f85d7010000 | jne 0x1dd $sequence_3 = { 8b35???????? 8da42400000000 8d85f8efffff c785f8efffff00000000 50 } // n = 5, score = 100 // 8b35???????? | // 8da42400000000 | lea esp, [esp] // 8d85f8efffff | lea eax, [ebp - 0x1008] // c785f8efffff00000000 | mov dword ptr [ebp - 0x1008], 0 // 50 | push eax $sequence_4 = { ffd7 85c0 0f85b9000000 68???????? } // n = 4, score = 100 // ffd7 | call edi // 85c0 | test eax, eax // 0f85b9000000 | jne 0xbf // 68???????? | $sequence_5 = { 8b442410 68???????? 50 8b08 ff9194000000 8b442410 } // n = 6, score = 100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 68???????? | // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff9194000000 | call dword ptr [ecx + 0x94] // 8b442410 | mov eax, dword ptr [esp + 0x10] $sequence_6 = { 6a00 ffd7 8d842448090000 50 } // n = 4, score = 100 // 6a00 | push 0 // ffd7 | call edi // 8d842448090000 | lea eax, [esp + 0x948] // 50 | push eax $sequence_7 = { 8b442410 6a00 50 8b08 ff91ac000000 8b442410 } // n = 6, score = 100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 6a00 | push 0 // 50 | push eax // 8b08 | mov ecx, dword ptr [eax] // ff91ac000000 | call dword ptr [ecx + 0xac] // 8b442410 | mov eax, dword ptr [esp + 0x10] $sequence_8 = { 83e802 7446 48 7423 48 7576 } // n = 6, score = 100 // 83e802 | sub eax, 2 // 7446 | je 0x48 // 48 | dec eax // 7423 | je 0x25 // 48 | dec eax // 7576 | jne 0x78 $sequence_9 = { 50 ffd7 85c0 0f853b020000 68???????? e8???????? 50 } // n = 7, score = 100 // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax // 0f853b020000 | jne 0x241 // 68???????? | // e8???????? | // 50 | push eax condition: 7 of them and filesize < 114688 }
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