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rule win_hacksfase_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.hacksfase." 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.hacksfase" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 7435 50 ffd6 5f 5e } // n = 5, score = 100 // 7435 | je 0x37 // 50 | push eax // ffd6 | call esi // 5f | pop edi // 5e | pop esi $sequence_1 = { 895e24 895e28 740d 50 ff15???????? 895e30 895e2c } // n = 7, score = 100 // 895e24 | mov dword ptr [esi + 0x24], ebx // 895e28 | mov dword ptr [esi + 0x28], ebx // 740d | je 0xf // 50 | push eax // ff15???????? | // 895e30 | mov dword ptr [esi + 0x30], ebx // 895e2c | mov dword ptr [esi + 0x2c], ebx $sequence_2 = { 53 51 ff7628 895dbc 895dc4 895dc0 895dc8 } // n = 7, score = 100 // 53 | push ebx // 51 | push ecx // ff7628 | push dword ptr [esi + 0x28] // 895dbc | mov dword ptr [ebp - 0x44], ebx // 895dc4 | mov dword ptr [ebp - 0x3c], ebx // 895dc0 | mov dword ptr [ebp - 0x40], ebx // 895dc8 | mov dword ptr [ebp - 0x38], ebx $sequence_3 = { 832600 83c60c 4b 75ef 5e } // n = 5, score = 100 // 832600 | and dword ptr [esi], 0 // 83c60c | add esi, 0xc // 4b | dec ebx // 75ef | jne 0xfffffff1 // 5e | pop esi $sequence_4 = { 51 8b0d???????? 89842418040000 e8???????? b9???????? e8???????? } // n = 6, score = 100 // 51 | push ecx // 8b0d???????? | // 89842418040000 | mov dword ptr [esp + 0x418], eax // e8???????? | // b9???????? | // e8???????? | $sequence_5 = { a806 746c b9???????? c78424bc02000003000000 c78424c002000002000000 c78424c4020000ffffffff c78424b802000010000000 } // n = 7, score = 100 // a806 | test al, 6 // 746c | je 0x6e // b9???????? | // c78424bc02000003000000 | mov dword ptr [esp + 0x2bc], 3 // c78424c002000002000000 | mov dword ptr [esp + 0x2c0], 2 // c78424c4020000ffffffff | mov dword ptr [esp + 0x2c4], 0xffffffff // c78424b802000010000000 | mov dword ptr [esp + 0x2b8], 0x10 $sequence_6 = { 8b35???????? 85f6 7412 6a00 8bce e8???????? } // n = 6, score = 100 // 8b35???????? | // 85f6 | test esi, esi // 7412 | je 0x14 // 6a00 | push 0 // 8bce | mov ecx, esi // e8???????? | $sequence_7 = { a1???????? 85c0 7428 50 ff15???????? 83c404 85c0 } // n = 7, score = 100 // a1???????? | // 85c0 | test eax, eax // 7428 | je 0x2a // 50 | push eax // ff15???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax $sequence_8 = { 0f8400030000 ebbb c744241400000000 8b442414 83c9ff } // n = 5, score = 100 // 0f8400030000 | je 0x306 // ebbb | jmp 0xffffffbd // c744241400000000 | mov dword ptr [esp + 0x14], 0 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 83c9ff | or ecx, 0xffffffff $sequence_9 = { 5f c3 55 8bec 51 8a4108 8365fc00 } // n = 7, score = 100 // 5f | pop edi // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 8a4108 | mov al, byte ptr [ecx + 8] // 8365fc00 | and dword ptr [ebp - 4], 0 condition: 7 of them and filesize < 106496 }
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