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rule win_hacksfase_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { a1???????? 6a00 50 ff15???????? 85c0 0f84e3000000 } // n = 6, score = 100 // a1???????? | // 6a00 | push 0 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 0f84e3000000 | je 0xe9 $sequence_1 = { a1???????? 8b4804 f681f4a4001006 743f 8b0d???????? 6a10 68???????? } // n = 7, score = 100 // a1???????? | // 8b4804 | mov ecx, dword ptr [eax + 4] // f681f4a4001006 | test byte ptr [ecx + 0x1000a4f4], 6 // 743f | je 0x41 // 8b0d???????? | // 6a10 | push 0x10 // 68???????? | $sequence_2 = { e8???????? 8b442418 8d4c2418 50 } // n = 4, score = 100 // e8???????? | // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8d4c2418 | lea ecx, [esp + 0x18] // 50 | push eax $sequence_3 = { 6a08 e8???????? 894628 8b4624 59 897dfc 8938 } // n = 7, score = 100 // 6a08 | push 8 // e8???????? | // 894628 | mov dword ptr [esi + 0x28], eax // 8b4624 | mov eax, dword ptr [esi + 0x24] // 59 | pop ecx // 897dfc | mov dword ptr [ebp - 4], edi // 8938 | mov dword ptr [eax], edi $sequence_4 = { 5b 8be5 5d c20400 8b15???????? 52 } // n = 6, score = 100 // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c20400 | ret 4 // 8b15???????? | // 52 | push edx $sequence_5 = { 83c660 6a00 56 6a00 ff15???????? 85c0 0f852c010000 } // n = 7, score = 100 // 83c660 | add esi, 0x60 // 6a00 | push 0 // 56 | push esi // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 0f852c010000 | jne 0x132 $sequence_6 = { 85c0 0f84cc000000 8b15???????? 52 ffd5 c744241003000000 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f84cc000000 | je 0xd2 // 8b15???????? | // 52 | push edx // ffd5 | call ebp // c744241003000000 | mov dword ptr [esp + 0x10], 3 $sequence_7 = { 8d8424b4010000 8d8c24b0000000 50 51 8d5708 68???????? } // n = 6, score = 100 // 8d8424b4010000 | lea eax, [esp + 0x1b4] // 8d8c24b0000000 | lea ecx, [esp + 0xb0] // 50 | push eax // 51 | push ecx // 8d5708 | lea edx, [edi + 8] // 68???????? | $sequence_8 = { 50 50 f3ab 8b5500 8d442418 } // n = 5, score = 100 // 50 | push eax // 50 | push eax // f3ab | rep stosd dword ptr es:[edi], eax // 8b5500 | mov edx, dword ptr [ebp] // 8d442418 | lea eax, [esp + 0x18] $sequence_9 = { 8b4628 8d55d4 52 8d55dc } // n = 4, score = 100 // 8b4628 | mov eax, dword ptr [esi + 0x28] // 8d55d4 | lea edx, [ebp - 0x2c] // 52 | push edx // 8d55dc | lea edx, [ebp - 0x24] condition: 7 of them and filesize < 106496 }
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