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rule win_nvisospit_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.nvisospit." 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.nvisospit" 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 = { 8945bc 0fb785b0fbffff 0fb7c8 0fb785aefbffff 0fb7d0 0fb785acfbffff 0fb7c0 } // n = 7, score = 100 // 8945bc | mov dword ptr [ebp - 0x44], eax // 0fb785b0fbffff | movzx eax, word ptr [ebp - 0x450] // 0fb7c8 | movzx ecx, ax // 0fb785aefbffff | movzx eax, word ptr [ebp - 0x452] // 0fb7d0 | movzx edx, ax // 0fb785acfbffff | movzx eax, word ptr [ebp - 0x454] // 0fb7c0 | movzx eax, ax $sequence_1 = { 8b00 89442404 c70424???????? e8???????? 8b4304 83c008 8b00 } // n = 7, score = 100 // 8b00 | mov eax, dword ptr [eax] // 89442404 | mov dword ptr [esp + 4], eax // c70424???????? | // e8???????? | // 8b4304 | mov eax, dword ptr [ebx + 4] // 83c008 | add eax, 8 // 8b00 | mov eax, dword ptr [eax] $sequence_2 = { a1???????? c744241000504000 c7442408???????? c7442404???????? c70424???????? a3???????? } // n = 6, score = 100 // a1???????? | // c744241000504000 | mov dword ptr [esp + 0x10], 0x405000 // c7442408???????? | // c7442404???????? | // c70424???????? | // a3???????? | $sequence_3 = { ffd0 83ec04 b800000000 8d65f4 59 } // n = 5, score = 100 // ffd0 | call eax // 83ec04 | sub esp, 4 // b800000000 | mov eax, 0 // 8d65f4 | lea esp, [ebp - 0xc] // 59 | pop ecx $sequence_4 = { 8945dc c70424???????? e8???????? 8d85b4fdffff 89442404 } // n = 5, score = 100 // 8945dc | mov dword ptr [ebp - 0x24], eax // c70424???????? | // e8???????? | // 8d85b4fdffff | lea eax, [ebp - 0x24c] // 89442404 | mov dword ptr [esp + 4], eax $sequence_5 = { a1???????? ffd0 83ec04 8b45dc 89442404 c70424???????? } // n = 6, score = 100 // a1???????? | // ffd0 | call eax // 83ec04 | sub esp, 4 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 89442404 | mov dword ptr [esp + 4], eax // c70424???????? | $sequence_6 = { 0fb7c0 8d9da4f9ffff 81c307010000 895c2414 } // n = 4, score = 100 // 0fb7c0 | movzx eax, ax // 8d9da4f9ffff | lea ebx, [ebp - 0x65c] // 81c307010000 | add ebx, 0x107 // 895c2414 | mov dword ptr [esp + 0x14], ebx $sequence_7 = { 8b45c4 29d0 0307 89c3 89f8 e8???????? } // n = 6, score = 100 // 8b45c4 | mov eax, dword ptr [ebp - 0x3c] // 29d0 | sub eax, edx // 0307 | add eax, dword ptr [edi] // 89c3 | mov ebx, eax // 89f8 | mov eax, edi // e8???????? | $sequence_8 = { c70424???????? e8???????? 8b859cf9ffff 8b401a 89442404 } // n = 5, score = 100 // c70424???????? | // e8???????? | // 8b859cf9ffff | mov eax, dword ptr [ebp - 0x664] // 8b401a | mov eax, dword ptr [eax + 0x1a] // 89442404 | mov dword ptr [esp + 4], eax $sequence_9 = { 7728 8b4514 8945f4 c70424???????? e8???????? 8b45f4 } // n = 6, score = 100 // 7728 | ja 0x2a // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8945f4 | mov dword ptr [ebp - 0xc], eax // c70424???????? | // e8???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] condition: 7 of them and filesize < 66560 }
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