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rule win_swen_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.swen." 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.swen" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 89bddcfeffff 8b7508 56 e8???????? 59 85c0 7477 } // n = 7, score = 100 // 89bddcfeffff | mov dword ptr [ebp - 0x124], edi // 8b7508 | mov esi, dword ptr [ebp + 8] // 56 | push esi // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7477 | je 0x79 $sequence_1 = { 899d74ffffff 895dfc b8???????? 50 50 ff15???????? } // n = 6, score = 100 // 899d74ffffff | mov dword ptr [ebp - 0x8c], ebx // 895dfc | mov dword ptr [ebp - 4], ebx // b8???????? | // 50 | push eax // 50 | push eax // ff15???????? | $sequence_2 = { 68???????? 57 e8???????? 8975e0 8d45e0 50 } // n = 6, score = 100 // 68???????? | // 57 | push edi // e8???????? | // 8975e0 | mov dword ptr [ebp - 0x20], esi // 8d45e0 | lea eax, dword ptr [ebp - 0x20] // 50 | push eax $sequence_3 = { 50 57 e8???????? 68???????? 57 e8???????? 8d45bc } // n = 7, score = 100 // 50 | push eax // 57 | push edi // e8???????? | // 68???????? | // 57 | push edi // e8???????? | // 8d45bc | lea eax, dword ptr [ebp - 0x44] $sequence_4 = { 68???????? eb7c 57 e8???????? 59 48 741e } // n = 7, score = 100 // 68???????? | // eb7c | jmp 0x7e // 57 | push edi // e8???????? | // 59 | pop ecx // 48 | dec eax // 741e | je 0x20 $sequence_5 = { 8d8510ffffff 50 68???????? 8d4580 50 ff15???????? 83c40c } // n = 7, score = 100 // 8d8510ffffff | lea eax, dword ptr [ebp - 0xf0] // 50 | push eax // 68???????? | // 8d4580 | lea eax, dword ptr [ebp - 0x80] // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc $sequence_6 = { 50 be???????? 8bce e8???????? 6a01 8bce } // n = 6, score = 100 // 50 | push eax // be???????? | // 8bce | mov ecx, esi // e8???????? | // 6a01 | push 1 // 8bce | mov ecx, esi $sequence_7 = { 83c414 6a64 8d85bcfeffff 50 68f0030000 ff7508 ffd6 } // n = 7, score = 100 // 83c414 | add esp, 0x14 // 6a64 | push 0x64 // 8d85bcfeffff | lea eax, dword ptr [ebp - 0x144] // 50 | push eax // 68f0030000 | push 0x3f0 // ff7508 | push dword ptr [ebp + 8] // ffd6 | call esi $sequence_8 = { e8???????? 83c410 53 ff15???????? 8945e4 83f8ff } // n = 6, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // 53 | push ebx // ff15???????? | // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 83f8ff | cmp eax, -1 $sequence_9 = { 6802000080 ff15???????? 399d68ffffff 7507 33c0 e9???????? } // n = 6, score = 100 // 6802000080 | push 0x80000002 // ff15???????? | // 399d68ffffff | cmp dword ptr [ebp - 0x98], ebx // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | condition: 7 of them and filesize < 286720 }
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