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rule win_findpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.findpos." 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.findpos" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { ba68cb7a76 873a bfe5920925 3f 2afa b4c5 b7cb } // n = 7, score = 100 // ba68cb7a76 | mov edx, 0x767acb68 // 873a | xchg dword ptr [edx], edi // bfe5920925 | mov edi, 0x250992e5 // 3f | aas // 2afa | sub bh, dl // b4c5 | mov ah, 0xc5 // b7cb | mov bh, 0xcb $sequence_1 = { 751a 2bca 84db 7414 42 } // n = 5, score = 100 // 751a | jne 0x1c // 2bca | sub ecx, edx // 84db | test bl, bl // 7414 | je 0x16 // 42 | inc edx $sequence_2 = { e8???????? 6a00 6a01 8d4c2418 e9???????? 68???????? 8d4c242c } // n = 7, score = 100 // e8???????? | // 6a00 | push 0 // 6a01 | push 1 // 8d4c2418 | lea ecx, [esp + 0x18] // e9???????? | // 68???????? | // 8d4c242c | lea ecx, [esp + 0x2c] $sequence_3 = { 46 41 3bca 7ced 3bfb 7d10 } // n = 6, score = 100 // 46 | inc esi // 41 | inc ecx // 3bca | cmp ecx, edx // 7ced | jl 0xffffffef // 3bfb | cmp edi, ebx // 7d10 | jge 0x12 $sequence_4 = { 8b75f8 3bf7 75cb 813d????????c8000000 } // n = 4, score = 100 // 8b75f8 | mov esi, dword ptr [ebp - 8] // 3bf7 | cmp esi, edi // 75cb | jne 0xffffffcd // 813d????????c8000000 | $sequence_5 = { 834dfcff 6a00 6a01 e8???????? eb02 } // n = 5, score = 100 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 6a00 | push 0 // 6a01 | push 1 // e8???????? | // eb02 | jmp 4 $sequence_6 = { 51 ff15???????? 8b45f8 891d???????? 6a04 6800300000 } // n = 6, score = 100 // 51 | push ecx // ff15???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 891d???????? | // 6a04 | push 4 // 6800300000 | push 0x3000 $sequence_7 = { 6800800000 53 51 ff15???????? } // n = 4, score = 100 // 6800800000 | push 0x8000 // 53 | push ebx // 51 | push ecx // ff15???????? | $sequence_8 = { 8945f8 8d45f8 50 c745ec00200000 ff15???????? 85c0 745f } // n = 7, score = 100 // 8945f8 | mov dword ptr [ebp - 8], eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // c745ec00200000 | mov dword ptr [ebp - 0x14], 0x2000 // ff15???????? | // 85c0 | test eax, eax // 745f | je 0x61 $sequence_9 = { 02d0 8875fb 8855fa 33c9 } // n = 4, score = 100 // 02d0 | add dl, al // 8875fb | mov byte ptr [ebp - 5], dh // 8855fa | mov byte ptr [ebp - 6], dl // 33c9 | xor ecx, ecx condition: 7 of them and filesize < 286720 }
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