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rule win_starsypound_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.starsypound." 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.starsypound" 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 = { 6801010000 e8???????? 53 6a01 6a02 e8???????? } // n = 6, score = 100 // 6801010000 | push 0x101 // e8???????? | // 53 | push ebx // 6a01 | push 1 // 6a02 | push 2 // e8???????? | $sequence_1 = { 50 e8???????? 83c40c 85c0 7e2b eb08 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7e2b | jle 0x2d // eb08 | jmp 0xa $sequence_2 = { 85c0 7e2b eb08 6a32 ff15???????? 8b4500 6a00 } // n = 7, score = 100 // 85c0 | test eax, eax // 7e2b | jle 0x2d // eb08 | jmp 0xa // 6a32 | push 0x32 // ff15???????? | // 8b4500 | mov eax, dword ptr [ebp] // 6a00 | push 0 $sequence_3 = { 6a10 51 55 89442424 e8???????? } // n = 5, score = 100 // 6a10 | push 0x10 // 51 | push ecx // 55 | push ebp // 89442424 | mov dword ptr [esp + 0x24], eax // e8???????? | $sequence_4 = { 6a18 e8???????? 8bb42424040000 8bd8 } // n = 4, score = 100 // 6a18 | push 0x18 // e8???????? | // 8bb42424040000 | mov esi, dword ptr [esp + 0x424] // 8bd8 | mov ebx, eax $sequence_5 = { 51 6801010000 e8???????? 53 6a01 6a02 } // n = 6, score = 100 // 51 | push ecx // 6801010000 | push 0x101 // e8???????? | // 53 | push ebx // 6a01 | push 1 // 6a02 | push 2 $sequence_6 = { 6a00 50 8d4c2424 56 } // n = 4, score = 100 // 6a00 | push 0 // 50 | push eax // 8d4c2424 | lea ecx, [esp + 0x24] // 56 | push esi $sequence_7 = { e8???????? 83c418 83feff 0f84d9feffff b93f000000 33c0 8d7c2458 } // n = 7, score = 100 // e8???????? | // 83c418 | add esp, 0x18 // 83feff | cmp esi, -1 // 0f84d9feffff | je 0xfffffedf // b93f000000 | mov ecx, 0x3f // 33c0 | xor eax, eax // 8d7c2458 | lea edi, [esp + 0x58] $sequence_8 = { 7470 8b3d???????? 8d542410 68???????? } // n = 4, score = 100 // 7470 | je 0x72 // 8b3d???????? | // 8d542410 | lea edx, [esp + 0x10] // 68???????? | $sequence_9 = { 5e 5d 5b 81c4dc030000 c3 8d542430 66c74424140200 } // n = 7, score = 100 // 5e | pop esi // 5d | pop ebp // 5b | pop ebx // 81c4dc030000 | add esp, 0x3dc // c3 | ret // 8d542430 | lea edx, [esp + 0x30] // 66c74424140200 | mov word ptr [esp + 0x14], 2 condition: 7 of them and filesize < 40960 }
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