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rule win_pwnpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.pwnpos." 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.pwnpos" 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 = { 8bec 83ec14 8b0d???????? 53 56 57 8b7904 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 // 8b0d???????? | // 53 | push ebx // 56 | push esi // 57 | push edi // 8b7904 | mov edi, dword ptr [ecx + 4] $sequence_1 = { 391d???????? 0f84a4000000 8d75d4 e8???????? 68???????? 50 c645fc01 } // n = 7, score = 100 // 391d???????? | // 0f84a4000000 | je 0xaa // 8d75d4 | lea esi, [ebp - 0x2c] // e8???????? | // 68???????? | // 50 | push eax // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_2 = { 8bbd34ffffff 8d0c36 8bd7 2bd1 56 83c202 33c0 } // n = 7, score = 100 // 8bbd34ffffff | mov edi, dword ptr [ebp - 0xcc] // 8d0c36 | lea ecx, [esi + esi] // 8bd7 | mov edx, edi // 2bd1 | sub edx, ecx // 56 | push esi // 83c202 | add edx, 2 // 33c0 | xor eax, eax $sequence_3 = { 6800400000 8d8c2494000000 51 ff15???????? 85c0 7526 8b8c2498400000 } // n = 7, score = 100 // 6800400000 | push 0x4000 // 8d8c2494000000 | lea ecx, [esp + 0x94] // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 7526 | jne 0x28 // 8b8c2498400000 | mov ecx, dword ptr [esp + 0x4098] $sequence_4 = { 0f83c6fbffff 03c7 03cf 83ff1f 0f87a4030000 ff24bd32a54200 8bc6 } // n = 7, score = 100 // 0f83c6fbffff | jae 0xfffffbcc // 03c7 | add eax, edi // 03cf | add ecx, edi // 83ff1f | cmp edi, 0x1f // 0f87a4030000 | ja 0x3aa // ff24bd32a54200 | jmp dword ptr [edi*4 + 0x42a532] // 8bc6 | mov eax, esi $sequence_5 = { 64a300000000 833d????????00 742d 8d442410 } // n = 4, score = 100 // 64a300000000 | mov dword ptr fs:[0], eax // 833d????????00 | // 742d | je 0x2f // 8d442410 | lea eax, [esp + 0x10] $sequence_6 = { 3935???????? 7634 a1???????? 8b4804 51 } // n = 5, score = 100 // 3935???????? | // 7634 | jbe 0x36 // a1???????? | // 8b4804 | mov ecx, dword ptr [eax + 4] // 51 | push ecx $sequence_7 = { 8b8d74feffff 8b5104 8b841580feffff a806 7567 8b8c15acfeffff 8b11 } // n = 7, score = 100 // 8b8d74feffff | mov ecx, dword ptr [ebp - 0x18c] // 8b5104 | mov edx, dword ptr [ecx + 4] // 8b841580feffff | mov eax, dword ptr [ebp + edx - 0x180] // a806 | test al, 6 // 7567 | jne 0x69 // 8b8c15acfeffff | mov ecx, dword ptr [ebp + edx - 0x154] // 8b11 | mov edx, dword ptr [ecx] $sequence_8 = { 8b855cfeffff 894608 8b8570feffff 6bc00c 56 ff9010be4300 59 } // n = 7, score = 100 // 8b855cfeffff | mov eax, dword ptr [ebp - 0x1a4] // 894608 | mov dword ptr [esi + 8], eax // 8b8570feffff | mov eax, dword ptr [ebp - 0x190] // 6bc00c | imul eax, eax, 0xc // 56 | push esi // ff9010be4300 | call dword ptr [eax + 0x43be10] // 59 | pop ecx $sequence_9 = { 68???????? 8919 885904 e8???????? eb02 33f6 8937 } // n = 7, score = 100 // 68???????? | // 8919 | mov dword ptr [ecx], ebx // 885904 | mov byte ptr [ecx + 4], bl // e8???????? | // eb02 | jmp 4 // 33f6 | xor esi, esi // 8937 | mov dword ptr [edi], esi condition: 7 of them and filesize < 638976 }
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