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rule win_aveo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.aveo." 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.aveo" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 59 59 8b7508 8d34f550154100 391e 7404 } // n = 6, score = 200 // 59 | pop ecx // 59 | pop ecx // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d34f550154100 | lea esi, [esi*8 + 0x411550] // 391e | cmp dword ptr [esi], ebx // 7404 | je 6 $sequence_1 = { 53 56 57 8db570faffff } // n = 4, score = 200 // 53 | push ebx // 56 | push esi // 57 | push edi // 8db570faffff | lea esi, [ebp - 0x590] $sequence_2 = { 8d8d10feffff e8???????? 8b95f8fdffff 52 8bf0 } // n = 5, score = 200 // 8d8d10feffff | lea ecx, [ebp - 0x1f0] // e8???????? | // 8b95f8fdffff | mov edx, dword ptr [ebp - 0x208] // 52 | push edx // 8bf0 | mov esi, eax $sequence_3 = { 8b4de0 8d55dc 52 6800008000 } // n = 4, score = 200 // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 8d55dc | lea edx, [ebp - 0x24] // 52 | push edx // 6800008000 | push 0x800000 $sequence_4 = { 52 8d85f4fbffff 68???????? 50 e8???????? } // n = 5, score = 200 // 52 | push edx // 8d85f4fbffff | lea eax, [ebp - 0x40c] // 68???????? | // 50 | push eax // e8???????? | $sequence_5 = { 50 f3a4 ff15???????? 6800010000 8d8df8feffff 6a00 51 } // n = 7, score = 200 // 50 | push eax // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // ff15???????? | // 6800010000 | push 0x100 // 8d8df8feffff | lea ecx, [ebp - 0x108] // 6a00 | push 0 // 51 | push ecx $sequence_6 = { 53 8d4802 8955f4 56 8a51fe } // n = 5, score = 200 // 53 | push ebx // 8d4802 | lea ecx, [eax + 2] // 8955f4 | mov dword ptr [ebp - 0xc], edx // 56 | push esi // 8a51fe | mov dl, byte ptr [ecx - 2] $sequence_7 = { 7424 8b85f4efffff 3bc7 741a } // n = 4, score = 200 // 7424 | je 0x26 // 8b85f4efffff | mov eax, dword ptr [ebp - 0x100c] // 3bc7 | cmp eax, edi // 741a | je 0x1c $sequence_8 = { c7442418e8030000 ff15???????? 3bc7 740c 68???????? 50 } // n = 6, score = 200 // c7442418e8030000 | mov dword ptr [esp + 0x18], 0x3e8 // ff15???????? | // 3bc7 | cmp eax, edi // 740c | je 0xe // 68???????? | // 50 | push eax $sequence_9 = { c7430801000000 e8???????? 6a06 89430c 8d4310 8d89d41a4100 5a } // n = 7, score = 200 // c7430801000000 | mov dword ptr [ebx + 8], 1 // e8???????? | // 6a06 | push 6 // 89430c | mov dword ptr [ebx + 0xc], eax // 8d4310 | lea eax, [ebx + 0x10] // 8d89d41a4100 | lea ecx, [ecx + 0x411ad4] // 5a | pop edx condition: 7 of them and filesize < 180224 }
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