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rule win_stabuniq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 85c0 7415 8b4dfc 83c102 51 8b55e4 52 } // n = 7, score = 100 // 85c0 | test eax, eax // 7415 | je 0x17 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 83c102 | add ecx, 2 // 51 | push ecx // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 52 | push edx $sequence_1 = { 8b4dfc 038814020000 894dfc 8b5508 8b45fc 898240020000 8b4d08 } // n = 7, score = 100 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 038814020000 | add ecx, dword ptr [eax + 0x214] // 894dfc | mov dword ptr [ebp - 4], ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b45fc | mov eax, dword ptr [ebp - 4] // 898240020000 | mov dword ptr [edx + 0x240], eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_2 = { 6a0a 6a00 8d95f0feffff 52 e8???????? 68ff000000 6a00 } // n = 7, score = 100 // 6a0a | push 0xa // 6a00 | push 0 // 8d95f0feffff | lea edx, [ebp - 0x110] // 52 | push edx // e8???????? | // 68ff000000 | push 0xff // 6a00 | push 0 $sequence_3 = { 81c160020000 51 8d95f0feffff 52 8b4510 ff90b0010000 83c40c } // n = 7, score = 100 // 81c160020000 | add ecx, 0x260 // 51 | push ecx // 8d95f0feffff | lea edx, [ebp - 0x110] // 52 | push edx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // ff90b0010000 | call dword ptr [eax + 0x1b0] // 83c40c | add esp, 0xc $sequence_4 = { 6a00 8b4508 8b8820020000 51 8b5508 8b8240020000 50 } // n = 7, score = 100 // 6a00 | push 0 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b8820020000 | mov ecx, dword ptr [eax + 0x220] // 51 | push ecx // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b8240020000 | mov eax, dword ptr [edx + 0x240] // 50 | push eax $sequence_5 = { 8b4508 8b4d10 8b9120010000 8990d4000000 8b4508 8b4d10 8b5114 } // n = 7, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b9120010000 | mov edx, dword ptr [ecx + 0x120] // 8990d4000000 | mov dword ptr [eax + 0xd4], edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b5114 | mov edx, dword ptr [ecx + 0x14] $sequence_6 = { 85c0 7535 8b8decfbffff 6bc928 8b5510 8d840ab2170000 50 } // n = 7, score = 100 // 85c0 | test eax, eax // 7535 | jne 0x37 // 8b8decfbffff | mov ecx, dword ptr [ebp - 0x414] // 6bc928 | imul ecx, ecx, 0x28 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8d840ab2170000 | lea eax, [edx + ecx + 0x17b2] // 50 | push eax $sequence_7 = { 8b4de4 51 e8???????? 837d1801 0f853a010000 c785ccfbffff00000000 6a00 } // n = 7, score = 100 // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 51 | push ecx // e8???????? | // 837d1801 | cmp dword ptr [ebp + 0x18], 1 // 0f853a010000 | jne 0x140 // c785ccfbffff00000000 | mov dword ptr [ebp - 0x434], 0 // 6a00 | push 0 $sequence_8 = { 51 8b5520 52 8b85b4feffff 50 8b4d20 } // n = 6, score = 100 // 51 | push ecx // 8b5520 | mov edx, dword ptr [ebp + 0x20] // 52 | push edx // 8b85b4feffff | mov eax, dword ptr [ebp - 0x14c] // 50 | push eax // 8b4d20 | mov ecx, dword ptr [ebp + 0x20] $sequence_9 = { 51 e8???????? b801000000 e9???????? 8b5510 52 } // n = 6, score = 100 // 51 | push ecx // e8???????? | // b801000000 | mov eax, 1 // e9???????? | // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 52 | push edx condition: 7 of them and filesize < 57344 }
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