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 = "2023-01-25" 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 = "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 = { c1f805 8bf7 83e61f c1e606 03348518ab0110 8975dc 8b02 } // n = 7, score = 100 // c1f805 | sar eax, 5 // 8bf7 | mov esi, edi // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 03348518ab0110 | add esi, dword ptr [eax*4 + 0x1001ab18] // 8975dc | mov dword ptr [ebp - 0x24], esi // 8b02 | mov eax, dword ptr [edx] $sequence_1 = { c78424fc020000526b464a 50 68???????? c784240803000054455645 c684240c03000000 ffd6 } // n = 6, score = 100 // c78424fc020000526b464a | mov dword ptr [esp + 0x2fc], 0x4a466b52 // 50 | push eax // 68???????? | // c784240803000054455645 | mov dword ptr [esp + 0x308], 0x45564554 // c684240c03000000 | mov byte ptr [esp + 0x30c], 0 // ffd6 | call esi $sequence_2 = { 8d4900 56 ff15???????? 56 8907 ff15???????? 40 } // n = 7, score = 100 // 8d4900 | lea ecx, [ecx] // 56 | push esi // ff15???????? | // 56 | push esi // 8907 | mov dword ptr [edi], eax // ff15???????? | // 40 | inc eax $sequence_3 = { 8b04f50c560110 5f 5e 5b 5d c3 55 } // n = 7, score = 100 // 8b04f50c560110 | mov eax, dword ptr [esi*8 + 0x1001560c] // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 5d | pop ebp // c3 | ret // 55 | push ebp $sequence_4 = { 668944247c 8d8424340a0000 6800040000 6a00 } // n = 4, score = 100 // 668944247c | mov word ptr [esp + 0x7c], ax // 8d8424340a0000 | lea eax, [esp + 0xa34] // 6800040000 | push 0x400 // 6a00 | push 0 $sequence_5 = { f30f7f45c8 6800040000 660f6f05???????? 50 f30f7f45d8 e8???????? 83c414 } // n = 7, score = 100 // f30f7f45c8 | movdqu xmmword ptr [ebp - 0x38], xmm0 // 6800040000 | push 0x400 // 660f6f05???????? | // 50 | push eax // f30f7f45d8 | movdqu xmmword ptr [ebp - 0x28], xmm0 // e8???????? | // 83c414 | add esp, 0x14 $sequence_6 = { 837e6800 0f848b000000 8b4674 85c0 741e } // n = 5, score = 100 // 837e6800 | cmp dword ptr [esi + 0x68], 0 // 0f848b000000 | je 0x91 // 8b4674 | mov eax, dword ptr [esi + 0x74] // 85c0 | test eax, eax // 741e | je 0x20 $sequence_7 = { 50 6a01 6a00 8d45e8 50 ffb578feffff ff15???????? } // n = 7, score = 100 // 50 | push eax // 6a01 | push 1 // 6a00 | push 0 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // ffb578feffff | push dword ptr [ebp - 0x188] // ff15???????? | $sequence_8 = { befeffffff 53 e8???????? 8b45cc 50 e8???????? ff75d4 } // n = 7, score = 100 // befeffffff | mov esi, 0xfffffffe // 53 | push ebx // e8???????? | // 8b45cc | mov eax, dword ptr [ebp - 0x34] // 50 | push eax // e8???????? | // ff75d4 | push dword ptr [ebp - 0x2c] $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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