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rule win_aveo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 3816 7503 8845fd fec0 } // n = 4, score = 200 // 3816 | cmp byte ptr [esi], dl // 7503 | jne 5 // 8845fd | mov byte ptr [ebp - 3], al // fec0 | inc al $sequence_1 = { 68???????? ff15???????? 6800010000 8d8df4fdffff 51 6a00 } // n = 6, score = 200 // 68???????? | // ff15???????? | // 6800010000 | push 0x100 // 8d8df4fdffff | lea ecx, dword ptr [ebp - 0x20c] // 51 | push ecx // 6a00 | push 0 $sequence_2 = { 83c404 8944242c 3bc7 7513 } // n = 4, score = 200 // 83c404 | add esp, 4 // 8944242c | mov dword ptr [esp + 0x2c], eax // 3bc7 | cmp eax, edi // 7513 | jne 0x15 $sequence_3 = { 8d8dfefeffff 6a00 51 8995f8feffff 668985fcfeffff } // n = 5, score = 200 // 8d8dfefeffff | lea ecx, dword ptr [ebp - 0x102] // 6a00 | push 0 // 51 | push ecx // 8995f8feffff | mov dword ptr [ebp - 0x108], edx // 668985fcfeffff | mov word ptr [ebp - 0x104], ax $sequence_4 = { 8be5 5d c3 880430 5f 8be5 } // n = 6, score = 200 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 880430 | mov byte ptr [eax + esi], al // 5f | pop edi // 8be5 | mov esp, ebp $sequence_5 = { 83c40c 68???????? 8d9578feffff 68???????? 52 e8???????? 83c40c } // n = 7, score = 200 // 83c40c | add esp, 0xc // 68???????? | // 8d9578feffff | lea edx, dword ptr [ebp - 0x188] // 68???????? | // 52 | push edx // e8???????? | // 83c40c | add esp, 0xc $sequence_6 = { 899df0fdffff e8???????? 83c404 8985f8fdffff 3bc3 7515 68???????? } // n = 7, score = 200 // 899df0fdffff | mov dword ptr [ebp - 0x210], ebx // e8???????? | // 83c404 | add esp, 4 // 8985f8fdffff | mov dword ptr [ebp - 0x208], eax // 3bc3 | cmp eax, ebx // 7515 | jne 0x17 // 68???????? | $sequence_7 = { c3 5e 5b 8d4702 } // n = 4, score = 200 // c3 | ret // 5e | pop esi // 5b | pop ebx // 8d4702 | lea eax, dword ptr [edi + 2] $sequence_8 = { 8bec 8b4508 56 8d34c550154100 833e00 } // n = 5, score = 200 // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 56 | push esi // 8d34c550154100 | lea esi, dword ptr [eax*8 + 0x411550] // 833e00 | cmp dword ptr [esi], 0 $sequence_9 = { 53 8d95e8faffff 52 8885eafaffff ff15???????? 8d85f8fcffff 68???????? } // n = 7, score = 200 // 53 | push ebx // 8d95e8faffff | lea edx, dword ptr [ebp - 0x518] // 52 | push edx // 8885eafaffff | mov byte ptr [ebp - 0x516], al // ff15???????? | // 8d85f8fcffff | lea eax, dword ptr [ebp - 0x308] // 68???????? | condition: 7 of them and filesize < 180224 }
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