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rule win_starsypound_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 8bf0 83feff 7470 8b3d???????? 8d542410 68???????? } // n = 6, score = 100 // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 7470 | je 0x72 // 8b3d???????? | // 8d542410 | lea edx, [esp + 0x10] // 68???????? | $sequence_1 = { 6a00 6a04 6a0a 51 52 e8???????? 83c40c } // n = 7, score = 100 // 6a00 | push 0 // 6a04 | push 4 // 6a0a | push 0xa // 51 | push ecx // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc $sequence_2 = { 885c3438 c744241804010000 ff15???????? 8dbc2458010000 83c9ff 33c0 } // n = 6, score = 100 // 885c3438 | mov byte ptr [esp + esi + 0x38], bl // c744241804010000 | mov dword ptr [esp + 0x18], 0x104 // ff15???????? | // 8dbc2458010000 | lea edi, [esp + 0x158] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_3 = { 8be8 83c404 b906000000 8bfd 8d44240c f3a5 } // n = 6, score = 100 // 8be8 | mov ebp, eax // 83c404 | add esp, 4 // b906000000 | mov ecx, 6 // 8bfd | mov edi, ebp // 8d44240c | lea eax, [esp + 0xc] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_4 = { 7470 8b3d???????? 8d542410 68???????? 52 } // n = 5, score = 100 // 7470 | je 0x72 // 8b3d???????? | // 8d542410 | lea edx, [esp + 0x10] // 68???????? | // 52 | push edx $sequence_5 = { 8bc8 33c0 83e103 f3a4 8dbc245c010000 } // n = 5, score = 100 // 8bc8 | mov ecx, eax // 33c0 | xor eax, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8dbc245c010000 | lea edi, [esp + 0x15c] $sequence_6 = { 81ec14040000 55 56 57 } // n = 4, score = 100 // 81ec14040000 | sub esp, 0x414 // 55 | push ebp // 56 | push esi // 57 | push edi $sequence_7 = { f2ae f7d1 49 2bca 3bf1 7cdf } // n = 6, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 2bca | sub ecx, edx // 3bf1 | cmp esi, ecx // 7cdf | jl 0xffffffe1 $sequence_8 = { 8b450c 8d542420 51 52 } // n = 4, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8d542420 | lea edx, [esp + 0x20] // 51 | push ecx // 52 | push edx $sequence_9 = { 6a18 e8???????? 8bb42424040000 8bd8 83c404 b906000000 8bfb } // n = 7, score = 100 // 6a18 | push 0x18 // e8???????? | // 8bb42424040000 | mov esi, dword ptr [esp + 0x424] // 8bd8 | mov ebx, eax // 83c404 | add esp, 4 // b906000000 | mov ecx, 6 // 8bfb | mov edi, ebx condition: 7 of them and filesize < 40960 }
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