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rule win_hacksfase_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 81ec1c080000 53 55 56 57 6a1c 32db } // n = 7, score = 100 // 81ec1c080000 | sub esp, 0x81c // 53 | push ebx // 55 | push ebp // 56 | push esi // 57 | push edi // 6a1c | push 0x1c // 32db | xor bl, bl $sequence_1 = { 897ddc 8b45d0 03c0 8945d0 8d4dd0 51 } // n = 6, score = 100 // 897ddc | mov dword ptr [ebp - 0x24], edi // 8b45d0 | mov eax, dword ptr [ebp - 0x30] // 03c0 | add eax, eax // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8d4dd0 | lea ecx, [ebp - 0x30] // 51 | push ecx $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 = { 895008 8b4120 8b5508 895020 8b4120 } // n = 5, score = 100 // 895008 | mov dword ptr [eax + 8], edx // 8b4120 | mov eax, dword ptr [ecx + 0x20] // 8b5508 | mov edx, dword ptr [ebp + 8] // 895020 | mov dword ptr [eax + 0x20], edx // 8b4120 | mov eax, dword ptr [ecx + 0x20] $sequence_4 = { 85c0 7509 b908000000 8bfb } // n = 4, score = 100 // 85c0 | test eax, eax // 7509 | jne 0xb // b908000000 | mov ecx, 8 // 8bfb | mov edi, ebx $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 = { ffd6 85c0 740a 33c0 5e 81c490010000 } // n = 6, score = 100 // ffd6 | call esi // 85c0 | test eax, eax // 740a | je 0xc // 33c0 | xor eax, eax // 5e | pop esi // 81c490010000 | add esp, 0x190 $sequence_7 = { 83ec18 8b4120 56 33f6 } // n = 4, score = 100 // 83ec18 | sub esp, 0x18 // 8b4120 | mov eax, dword ptr [ecx + 0x20] // 56 | push esi // 33f6 | xor esi, esi $sequence_8 = { 89842418040000 e8???????? b9???????? e8???????? } // n = 4, score = 100 // 89842418040000 | mov dword ptr [esp + 0x418], eax // e8???????? | // b9???????? | // e8???????? | $sequence_9 = { ff75f0 ffd7 6a18 e8???????? } // n = 4, score = 100 // ff75f0 | push dword ptr [ebp - 0x10] // ffd7 | call edi // 6a18 | push 0x18 // e8???????? | condition: 7 of them and filesize < 106496 }
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