Actor(s): Magic Hound
There is no description at this point.
rule win_leash_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.leash." 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.leash" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d8c24d0000000 51 6a10 68???????? e8???????? 83c40c 8d9424d0000000 } // n = 7, score = 200 // 8d8c24d0000000 | lea ecx, [esp + 0xd0] // 51 | push ecx // 6a10 | push 0x10 // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // 8d9424d0000000 | lea edx, [esp + 0xd0] $sequence_1 = { 2bf9 8d55a4 8bc1 8bf7 8bfa 8b5508 } // n = 6, score = 200 // 2bf9 | sub edi, ecx // 8d55a4 | lea edx, [ebp - 0x5c] // 8bc1 | mov eax, ecx // 8bf7 | mov esi, edi // 8bfa | mov edi, edx // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_2 = { 85c0 742c 8b4518 33f6 85c0 7c17 8b4d08 } // n = 7, score = 200 // 85c0 | test eax, eax // 742c | je 0x2e // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 33f6 | xor esi, esi // 85c0 | test eax, eax // 7c17 | jl 0x19 // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_3 = { 50 8d44240c 8b911c180000 50 } // n = 4, score = 200 // 50 | push eax // 8d44240c | lea eax, [esp + 0xc] // 8b911c180000 | mov edx, dword ptr [ecx + 0x181c] // 50 | push eax $sequence_4 = { 33d2 33f3 8a10 33db 8a5801 8974243c c1e218 } // n = 7, score = 200 // 33d2 | xor edx, edx // 33f3 | xor esi, ebx // 8a10 | mov dl, byte ptr [eax] // 33db | xor ebx, ebx // 8a5801 | mov bl, byte ptr [eax + 1] // 8974243c | mov dword ptr [esp + 0x3c], esi // c1e218 | shl edx, 0x18 $sequence_5 = { 7511 8b8b08080000 56 e8???????? e9???????? 8b8308080000 85c0 } // n = 7, score = 200 // 7511 | jne 0x13 // 8b8b08080000 | mov ecx, dword ptr [ebx + 0x808] // 56 | push esi // e8???????? | // e9???????? | // 8b8308080000 | mov eax, dword ptr [ebx + 0x808] // 85c0 | test eax, eax $sequence_6 = { 8d95a0b7ffff 8bf8 52 8d45ec 68???????? 50 889c3da0b7ffff } // n = 7, score = 200 // 8d95a0b7ffff | lea edx, [ebp - 0x4860] // 8bf8 | mov edi, eax // 52 | push edx // 8d45ec | lea eax, [ebp - 0x14] // 68???????? | // 50 | push eax // 889c3da0b7ffff | mov byte ptr [ebp + edi - 0x4860], bl $sequence_7 = { e8???????? 3bc3 8d4de4 0f9d45ef } // n = 4, score = 200 // e8???????? | // 3bc3 | cmp eax, ebx // 8d4de4 | lea ecx, [ebp - 0x1c] // 0f9d45ef | setge byte ptr [ebp - 0x11] $sequence_8 = { 51 8bc8 e8???????? 3bc3 8d4dd0 0f9d45ef c645fc02 } // n = 7, score = 200 // 51 | push ecx // 8bc8 | mov ecx, eax // e8???????? | // 3bc3 | cmp eax, ebx // 8d4dd0 | lea ecx, [ebp - 0x30] // 0f9d45ef | setge byte ptr [ebp - 0x11] // c645fc02 | mov byte ptr [ebp - 4], 2 $sequence_9 = { 5e c9 c3 ff25???????? 56 8b742408 } // n = 6, score = 200 // 5e | pop esi // c9 | leave // c3 | ret // ff25???????? | // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] condition: 7 of them and filesize < 761856 }
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