Actor(s): Calypso group, Karma Panda
There is no description at this point.
rule win_byeby_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.byeby." 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.byeby" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { e8???????? 68???????? 8d45f0 c745f0f4320110 } // n = 4, score = 100 // e8???????? | // 68???????? | // 8d45f0 | lea eax, [ebp - 0x10] // c745f0f4320110 | mov dword ptr [ebp - 0x10], 0x100132f4 $sequence_1 = { e8???????? 8b7df0 83c40c 037e74 c7467400000000 eb03 } // n = 6, score = 100 // e8???????? | // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 83c40c | add esp, 0xc // 037e74 | add edi, dword ptr [esi + 0x74] // c7467400000000 | mov dword ptr [esi + 0x74], 0 // eb03 | jmp 5 $sequence_2 = { 8bf0 53 ff742430 6a00 6a00 } // n = 5, score = 100 // 8bf0 | mov esi, eax // 53 | push ebx // ff742430 | push dword ptr [esp + 0x30] // 6a00 | push 0 // 6a00 | push 0 $sequence_3 = { 50 8b8528e5ffff 0f94c1 898d3ce5ffff 8b8d24e5ffff 8b048518ab0110 ff3401 } // n = 7, score = 100 // 50 | push eax // 8b8528e5ffff | mov eax, dword ptr [ebp - 0x1ad8] // 0f94c1 | sete cl // 898d3ce5ffff | mov dword ptr [ebp - 0x1ac4], ecx // 8b8d24e5ffff | mov ecx, dword ptr [ebp - 0x1adc] // 8b048518ab0110 | mov eax, dword ptr [eax*4 + 0x1001ab18] // ff3401 | push dword ptr [ecx + eax] $sequence_4 = { 8b8528e5ffff 8b048518ab0110 ff3401 ff15???????? 8bb540e5ffff 8bbd34e5ffff 85c0 } // n = 7, score = 100 // 8b8528e5ffff | mov eax, dword ptr [ebp - 0x1ad8] // 8b048518ab0110 | mov eax, dword ptr [eax*4 + 0x1001ab18] // ff3401 | push dword ptr [ecx + eax] // ff15???????? | // 8bb540e5ffff | mov esi, dword ptr [ebp - 0x1ac0] // 8bbd34e5ffff | mov edi, dword ptr [ebp - 0x1acc] // 85c0 | test eax, eax $sequence_5 = { 8d84245c020000 50 c78424600200005630564d c78424640200005130394e ffd7 40 50 } // n = 7, score = 100 // 8d84245c020000 | lea eax, [esp + 0x25c] // 50 | push eax // c78424600200005630564d | mov dword ptr [esp + 0x260], 0x4d563056 // c78424640200005130394e | mov dword ptr [esp + 0x264], 0x4e393051 // ffd7 | call edi // 40 | inc eax // 50 | push eax $sequence_6 = { 8b35???????? 8d442410 50 ff35???????? } // n = 4, score = 100 // 8b35???????? | // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // ff35???????? | $sequence_7 = { 7309 8b04c5e84e0110 5d c3 33c0 } // n = 5, score = 100 // 7309 | jae 0xb // 8b04c5e84e0110 | mov eax, dword ptr [eax*8 + 0x10014ee8] // 5d | pop ebp // c3 | ret // 33c0 | xor eax, eax $sequence_8 = { 0f8641010000 8b4c2420 83c714 8bff 837ff005 0f85fa000000 0fb707 } // n = 7, score = 100 // 0f8641010000 | jbe 0x147 // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 83c714 | add edi, 0x14 // 8bff | mov edi, edi // 837ff005 | cmp dword ptr [edi - 0x10], 5 // 0f85fa000000 | jne 0x100 // 0fb707 | movzx eax, word ptr [edi] $sequence_9 = { 3b0cc510900110 7427 40 83f82d 72f1 8d41ed } // n = 6, score = 100 // 3b0cc510900110 | cmp ecx, dword ptr [eax*8 + 0x10019010] // 7427 | je 0x29 // 40 | inc eax // 83f82d | cmp eax, 0x2d // 72f1 | jb 0xfffffff3 // 8d41ed | lea eax, [ecx - 0x13] condition: 7 of them and filesize < 253952 }
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