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rule win_stabuniq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 8b4d08 ff91a8000000 6a00 6a00 } // n = 5, score = 100 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // ff91a8000000 | call dword ptr [ecx + 0xa8] // 6a00 | push 0 // 6a00 | push 0 $sequence_1 = { 8b8df4feffff 51 6aff 8b5508 81c2a2050000 } // n = 5, score = 100 // 8b8df4feffff | mov ecx, dword ptr [ebp - 0x10c] // 51 | push ecx // 6aff | push -1 // 8b5508 | mov edx, dword ptr [ebp + 8] // 81c2a2050000 | add edx, 0x5a2 $sequence_2 = { 52 8b4510 ff503c 8b4d10 33d2 668b9106020000 } // n = 6, score = 100 // 52 | push edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // ff503c | call dword ptr [eax + 0x3c] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 33d2 | xor edx, edx // 668b9106020000 | mov dx, word ptr [ecx + 0x206] $sequence_3 = { 6a00 8b4d08 8b91f8010000 52 8b4508 ff9018010000 837de4ff } // n = 7, score = 100 // 6a00 | push 0 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b91f8010000 | mov edx, dword ptr [ecx + 0x1f8] // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // ff9018010000 | call dword ptr [eax + 0x118] // 837de4ff | cmp dword ptr [ebp - 0x1c], -1 $sequence_4 = { 8985c8fbffff 8b4d14 51 6a08 8b550c } // n = 5, score = 100 // 8985c8fbffff | mov dword ptr [ebp - 0x438], eax // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 51 | push ecx // 6a08 | push 8 // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_5 = { 8b4df8 8b11 035508 8955f4 eb0c 8b45f8 8b4810 } // n = 7, score = 100 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b11 | mov edx, dword ptr [ecx] // 035508 | add edx, dword ptr [ebp + 8] // 8955f4 | mov dword ptr [ebp - 0xc], edx // eb0c | jmp 0xe // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b4810 | mov ecx, dword ptr [eax + 0x10] $sequence_6 = { 51 e8???????? 8b5508 83c220 895508 c785bcfcffff00000000 8b4510 } // n = 7, score = 100 // 51 | push ecx // e8???????? | // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c220 | add edx, 0x20 // 895508 | mov dword ptr [ebp + 8], edx // c785bcfcffff00000000 | mov dword ptr [ebp - 0x344], 0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_7 = { 51 8b550c ff524c 8945fc 8b45fc 50 } // n = 6, score = 100 // 51 | push ecx // 8b550c | mov edx, dword ptr [ebp + 0xc] // ff524c | call dword ptr [edx + 0x4c] // 8945fc | mov dword ptr [ebp - 4], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax $sequence_8 = { 8d85c0fcffff 50 8b4d0c 51 e8???????? eb16 8b5510 } // n = 7, score = 100 // 8d85c0fcffff | lea eax, [ebp - 0x340] // 50 | push eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 51 | push ecx // e8???????? | // eb16 | jmp 0x18 // 8b5510 | mov edx, dword ptr [ebp + 0x10] $sequence_9 = { 81c155030000 51 e8???????? 6a00 8b5514 52 8b85e8feffff } // n = 7, score = 100 // 81c155030000 | add ecx, 0x355 // 51 | push ecx // e8???????? | // 6a00 | push 0 // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 52 | push edx // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] condition: 7 of them and filesize < 57344 }
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