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rule win_stabuniq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-05-04" version = "1" description = "Detects win.stabuniq." 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.stabuniq" malpedia_rule_date = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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 = { 6a00 8b4d10 ff91d4000000 8b5510 52 8b85e4feffff 50 } // n = 7, score = 100 // 6a00 | push 0 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // ff91d4000000 | call dword ptr [ecx + 0xd4] // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 52 | push edx // 8b85e4feffff | mov eax, dword ptr [ebp - 0x11c] // 50 | push eax $sequence_1 = { 51 8b5508 52 8b450c ff90a0010000 837df401 7707 } // n = 7, score = 100 // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b450c | mov eax, dword ptr [ebp + 0xc] // ff90a0010000 | call dword ptr [eax + 0x1a0] // 837df401 | cmp dword ptr [ebp - 0xc], 1 // 7707 | ja 9 $sequence_2 = { 8b4d08 8b91e4010000 52 8b4508 ff90e0000000 8b4d08 8b91ec010000 } // n = 7, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b91e4010000 | mov edx, dword ptr [ecx + 0x1e4] // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // ff90e0000000 | call dword ptr [eax + 0xe0] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b91ec010000 | mov edx, dword ptr [ecx + 0x1ec] $sequence_3 = { e9???????? b801000000 8be5 5d c20400 55 8bec } // n = 7, score = 100 // e9???????? | // b801000000 | mov eax, 1 // 8be5 | mov esp, ebp // 5d | pop ebp // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp $sequence_4 = { 8b82f0010000 50 8b4d14 ff91b8000000 8be5 5d c21400 } // n = 7, score = 100 // 8b82f0010000 | mov eax, dword ptr [edx + 0x1f0] // 50 | push eax // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // ff91b8000000 | call dword ptr [ecx + 0xb8] // 8be5 | mov esp, ebp // 5d | pop ebp // c21400 | ret 0x14 $sequence_5 = { 8b450c 50 8b4d20 ff514c 50 8b550c 52 } // n = 7, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 50 | push eax // 8b4d20 | mov ecx, dword ptr [ebp + 0x20] // ff514c | call dword ptr [ecx + 0x4c] // 50 | push eax // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx $sequence_6 = { c745f800000000 8a4d0c 51 8b55fc 52 8b4514 ff907c010000 } // n = 7, score = 100 // c745f800000000 | mov dword ptr [ebp - 8], 0 // 8a4d0c | mov cl, byte ptr [ebp + 0xc] // 51 | push ecx // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx // 8b4514 | mov eax, dword ptr [ebp + 0x14] // ff907c010000 | call dword ptr [eax + 0x17c] $sequence_7 = { 51 8b5508 ff9268010000 8b45a8 50 8b4d08 ff9150010000 } // n = 7, score = 100 // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // ff9268010000 | call dword ptr [edx + 0x168] // 8b45a8 | mov eax, dword ptr [ebp - 0x58] // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // ff9150010000 | call dword ptr [ecx + 0x150] $sequence_8 = { 8b55f8 ff92d0000000 8b4dec 8901 8b55ec 83c204 8955ec } // n = 7, score = 100 // 8b55f8 | mov edx, dword ptr [ebp - 8] // ff92d0000000 | call dword ptr [edx + 0xd0] // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 8901 | mov dword ptr [ecx], eax // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 83c204 | add edx, 4 // 8955ec | mov dword ptr [ebp - 0x14], edx $sequence_9 = { 8d95bcf7ffff 52 8d85f0fbffff 50 8b4d10 ff5130 8b5510 } // n = 7, score = 100 // 8d95bcf7ffff | lea edx, [ebp - 0x844] // 52 | push edx // 8d85f0fbffff | lea eax, [ebp - 0x410] // 50 | push eax // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // ff5130 | call dword ptr [ecx + 0x30] // 8b5510 | mov edx, dword ptr [ebp + 0x10] condition: 7 of them and filesize < 57344 }
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