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 = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { eb0c befdffffff eb05 befeffffff } // n = 4, score = 100 // eb0c | jmp 0xe // befdffffff | mov esi, 0xfffffffd // eb05 | jmp 7 // befeffffff | mov esi, 0xfffffffe $sequence_1 = { 8907 ff15???????? 40 8d8c243f0a0000 034c241c 8d7f04 03f0 } // n = 7, score = 100 // 8907 | mov dword ptr [edi], eax // ff15???????? | // 40 | inc eax // 8d8c243f0a0000 | lea ecx, [esp + 0xa3f] // 034c241c | add ecx, dword ptr [esp + 0x1c] // 8d7f04 | lea edi, [edi + 4] // 03f0 | add esi, eax $sequence_2 = { 741a 6a00 8bc7 2bc6 50 8b44241c 03c6 } // n = 7, score = 100 // 741a | je 0x1c // 6a00 | push 0 // 8bc7 | mov eax, edi // 2bc6 | sub eax, esi // 50 | push eax // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 03c6 | add eax, esi $sequence_3 = { c745e400000000 85c9 7404 33ff eb03 8d7e48 } // n = 6, score = 100 // c745e400000000 | mov dword ptr [ebp - 0x1c], 0 // 85c9 | test ecx, ecx // 7404 | je 6 // 33ff | xor edi, edi // eb03 | jmp 5 // 8d7e48 | lea edi, [esi + 0x48] $sequence_4 = { ff15???????? 8b35???????? 8d84243c060000 50 8d8424380a0000 50 ffd6 } // n = 7, score = 100 // ff15???????? | // 8b35???????? | // 8d84243c060000 | lea eax, [esp + 0x63c] // 50 | push eax // 8d8424380a0000 | lea eax, [esp + 0xa38] // 50 | push eax // ffd6 | call esi $sequence_5 = { 80bc05e7feffff5c 7411 8d85e8feffff 50 ffd6 } // n = 5, score = 100 // 80bc05e7feffff5c | cmp byte ptr [ebp + eax - 0x119], 0x5c // 7411 | je 0x13 // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // ffd6 | call esi $sequence_6 = { 50 57 ff15???????? 85c0 7461 8d642400 } // n = 6, score = 100 // 50 | push eax // 57 | push edi // ff15???????? | // 85c0 | test eax, eax // 7461 | je 0x63 // 8d642400 | lea esp, [esp] $sequence_7 = { 8d85a8feffff 50 8d8584fcffff 50 6a00 } // n = 5, score = 100 // 8d85a8feffff | lea eax, [ebp - 0x158] // 50 | push eax // 8d8584fcffff | lea eax, [ebp - 0x37c] // 50 | push eax // 6a00 | push 0 $sequence_8 = { 0fbec2 0fb680d0450110 83e00f eb02 33c0 8bbdc8fdffff 6bc009 } // n = 7, score = 100 // 0fbec2 | movsx eax, dl // 0fb680d0450110 | movzx eax, byte ptr [eax + 0x100145d0] // 83e00f | and eax, 0xf // eb02 | jmp 4 // 33c0 | xor eax, eax // 8bbdc8fdffff | mov edi, dword ptr [ebp - 0x238] // 6bc009 | imul eax, eax, 9 $sequence_9 = { 57 ff15???????? 85c0 0f84f6010000 8b542418 03542414 } // n = 6, score = 100 // 57 | push edi // ff15???????? | // 85c0 | test eax, eax // 0f84f6010000 | je 0x1fc // 8b542418 | mov edx, dword ptr [esp + 0x18] // 03542414 | add edx, dword ptr [esp + 0x14] condition: 7 of them and filesize < 253952 }
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