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rule win_swen_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 89b5a0feffff 83cbff 3bf3 742a 8d45e4 50 } // n = 6, score = 100 // 89b5a0feffff | mov dword ptr [ebp - 0x160], esi // 83cbff | or ebx, 0xffffffff // 3bf3 | cmp esi, ebx // 742a | je 0x2c // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax $sequence_1 = { 741d 68???????? 57 68???????? 68???????? 6802000080 e8???????? } // n = 7, score = 100 // 741d | je 0x1f // 68???????? | // 57 | push edi // 68???????? | // 68???????? | // 6802000080 | push 0x80000002 // e8???????? | $sequence_2 = { 7514 8365cc00 46 8975dc c6041e0d 46 8975dc } // n = 7, score = 100 // 7514 | jne 0x16 // 8365cc00 | and dword ptr [ebp - 0x34], 0 // 46 | inc esi // 8975dc | mov dword ptr [ebp - 0x24], esi // c6041e0d | mov byte ptr [esi + ebx], 0xd // 46 | inc esi // 8975dc | mov dword ptr [ebp - 0x24], esi $sequence_3 = { 50 e8???????? 68???????? 8d857cfeffff 50 } // n = 5, score = 100 // 50 | push eax // e8???????? | // 68???????? | // 8d857cfeffff | lea eax, [ebp - 0x184] // 50 | push eax $sequence_4 = { 8d8520ffffff 50 68???????? e8???????? 8d85bcfeffff 50 56 } // n = 7, score = 100 // 8d8520ffffff | lea eax, [ebp - 0xe0] // 50 | push eax // 68???????? | // e8???????? | // 8d85bcfeffff | lea eax, [ebp - 0x144] // 50 | push eax // 56 | push esi $sequence_5 = { e8???????? 50 ffb5e8f5ffff 8d8514ffffff 50 8b8568f9ffff f7d8 } // n = 7, score = 100 // e8???????? | // 50 | push eax // ffb5e8f5ffff | push dword ptr [ebp - 0xa18] // 8d8514ffffff | lea eax, [ebp - 0xec] // 50 | push eax // 8b8568f9ffff | mov eax, dword ptr [ebp - 0x698] // f7d8 | neg eax $sequence_6 = { 50 8b3d???????? ffd7 83c40c 6a00 6880000000 } // n = 6, score = 100 // 50 | push eax // 8b3d???????? | // ffd7 | call edi // 83c40c | add esp, 0xc // 6a00 | push 0 // 6880000000 | push 0x80 $sequence_7 = { 33f6 8975fc 3935???????? 0f854d010000 3935???????? 7543 c705????????01000000 } // n = 7, score = 100 // 33f6 | xor esi, esi // 8975fc | mov dword ptr [ebp - 4], esi // 3935???????? | // 0f854d010000 | jne 0x153 // 3935???????? | // 7543 | jne 0x45 // c705????????01000000 | $sequence_8 = { 8d85a4feffff 50 ffb5a0feffff ff15???????? ffb5a0feffff ff15???????? 8d8574ffffff } // n = 7, score = 100 // 8d85a4feffff | lea eax, [ebp - 0x15c] // 50 | push eax // ffb5a0feffff | push dword ptr [ebp - 0x160] // ff15???????? | // ffb5a0feffff | push dword ptr [ebp - 0x160] // ff15???????? | // 8d8574ffffff | lea eax, [ebp - 0x8c] $sequence_9 = { 8b4508 8818 395908 7506 834dfcff eb53 8b01 } // n = 7, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8818 | mov byte ptr [eax], bl // 395908 | cmp dword ptr [ecx + 8], ebx // 7506 | jne 8 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // eb53 | jmp 0x55 // 8b01 | mov eax, dword ptr [ecx] condition: 7 of them and filesize < 286720 }
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