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 = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 50 ffd6 c6840588feffff5c 8d458c 50 8d8588feffff 50 } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // c6840588feffff5c | mov byte ptr [ebp + eax - 0x178], 0x5c // 8d458c | lea eax, [ebp - 0x74] // 50 | push eax // 8d8588feffff | lea eax, [ebp - 0x178] // 50 | push eax $sequence_1 = { ff15???????? 8986c09b0110 83c604 83fe28 } // n = 4, score = 100 // ff15???????? | // 8986c09b0110 | mov dword ptr [esi + 0x10019bc0], eax // 83c604 | add esi, 4 // 83fe28 | cmp esi, 0x28 $sequence_2 = { 85ff 7460 57 33f6 ffd3 85c0 7e15 } // n = 7, score = 100 // 85ff | test edi, edi // 7460 | je 0x62 // 57 | push edi // 33f6 | xor esi, esi // ffd3 | call ebx // 85c0 | test eax, eax // 7e15 | jle 0x17 $sequence_3 = { c705????????18f50010 a3???????? c705????????a9f50010 c705????????03f60010 c705????????88f60010 } // n = 5, score = 100 // c705????????18f50010 | // a3???????? | // c705????????a9f50010 | // c705????????03f60010 | // c705????????88f60010 | $sequence_4 = { c784242c0300005130394e c78424300300005455464f c684243403000000 c78424e402000056464a42 c78424e8020000546c4e47 c68424ec02000000 c784249c02000052566846 } // n = 7, score = 100 // c784242c0300005130394e | mov dword ptr [esp + 0x32c], 0x4e393051 // c78424300300005455464f | mov dword ptr [esp + 0x330], 0x4f465554 // c684243403000000 | mov byte ptr [esp + 0x334], 0 // c78424e402000056464a42 | mov dword ptr [esp + 0x2e4], 0x424a4656 // c78424e8020000546c4e47 | mov dword ptr [esp + 0x2e8], 0x474e6c54 // c68424ec02000000 | mov byte ptr [esp + 0x2ec], 0 // c784249c02000052566846 | mov dword ptr [esp + 0x29c], 0x46685652 $sequence_5 = { 8906 8bc6 c7460400000000 c7464000000000 c7464400000000 c7464800000000 c7464c00000000 } // n = 7, score = 100 // 8906 | mov dword ptr [esi], eax // 8bc6 | mov eax, esi // c7460400000000 | mov dword ptr [esi + 4], 0 // c7464000000000 | mov dword ptr [esi + 0x40], 0 // c7464400000000 | mov dword ptr [esi + 0x44], 0 // c7464800000000 | mov dword ptr [esi + 0x48], 0 // c7464c00000000 | mov dword ptr [esi + 0x4c], 0 $sequence_6 = { 56 50 0fb785baf9ffff 50 } // n = 4, score = 100 // 56 | push esi // 50 | push eax // 0fb785baf9ffff | movzx eax, word ptr [ebp - 0x646] // 50 | push eax $sequence_7 = { 8d4c2430 e8???????? 6a38 8d442438 c78424040b000000000000 6a00 50 } // n = 7, score = 100 // 8d4c2430 | lea ecx, [esp + 0x30] // e8???????? | // 6a38 | push 0x38 // 8d442438 | lea eax, [esp + 0x38] // c78424040b000000000000 | mov dword ptr [esp + 0xb04], 0 // 6a00 | push 0 // 50 | push eax $sequence_8 = { 83c8ff a3???????? eb0e a1???????? 83f8ff 0f850a030000 833d????????ff } // n = 7, score = 100 // 83c8ff | or eax, 0xffffffff // a3???????? | // eb0e | jmp 0x10 // a1???????? | // 83f8ff | cmp eax, -1 // 0f850a030000 | jne 0x310 // 833d????????ff | $sequence_9 = { 83c40c c78424d40200005656424d 8d8424d4020000 c78424d802000054304645 c68424dc02000000 c78424e002000052453958 50 } // n = 7, score = 100 // 83c40c | add esp, 0xc // c78424d40200005656424d | mov dword ptr [esp + 0x2d4], 0x4d425656 // 8d8424d4020000 | lea eax, [esp + 0x2d4] // c78424d802000054304645 | mov dword ptr [esp + 0x2d8], 0x45463054 // c68424dc02000000 | mov byte ptr [esp + 0x2dc], 0 // c78424e002000052453958 | mov dword ptr [esp + 0x2e0], 0x58394552 // 50 | push eax condition: 7 of them and filesize < 253952 }
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