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rule win_chinoxy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.chinoxy." 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.chinoxy" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 5b c3 8b442414 57 56 53 50 } // n = 7, score = 100 // 5b | pop ebx // c3 | ret // 8b442414 | mov eax, dword ptr [esp + 0x14] // 57 | push edi // 56 | push esi // 53 | push ebx // 50 | push eax $sequence_1 = { 50 8bce ff9290000000 5f 8bc3 } // n = 5, score = 100 // 50 | push eax // 8bce | mov ecx, esi // ff9290000000 | call dword ptr [edx + 0x90] // 5f | pop edi // 8bc3 | mov eax, ebx $sequence_2 = { 8bce ff5240 5f 8bc3 5e 5b c20400 } // n = 7, score = 100 // 8bce | mov ecx, esi // ff5240 | call dword ptr [edx + 0x40] // 5f | pop edi // 8bc3 | mov eax, ebx // 5e | pop esi // 5b | pop ebx // c20400 | ret 4 $sequence_3 = { 894610 8b460c 3bc6 75a9 8b830c010000 8db304010000 3bc6 } // n = 7, score = 100 // 894610 | mov dword ptr [esi + 0x10], eax // 8b460c | mov eax, dword ptr [esi + 0xc] // 3bc6 | cmp eax, esi // 75a9 | jne 0xffffffab // 8b830c010000 | mov eax, dword ptr [ebx + 0x10c] // 8db304010000 | lea esi, [ebx + 0x104] // 3bc6 | cmp eax, esi $sequence_4 = { 83ff04 723e 8b06 85c0 7508 5f b804000000 } // n = 7, score = 100 // 83ff04 | cmp edi, 4 // 723e | jb 0x40 // 8b06 | mov eax, dword ptr [esi] // 85c0 | test eax, eax // 7508 | jne 0xa // 5f | pop edi // b804000000 | mov eax, 4 $sequence_5 = { 56 8b742410 57 8b06 33d0 33c0 89542414 } // n = 7, score = 100 // 56 | push esi // 8b742410 | mov esi, dword ptr [esp + 0x10] // 57 | push edi // 8b06 | mov eax, dword ptr [esi] // 33d0 | xor edx, eax // 33c0 | xor eax, eax // 89542414 | mov dword ptr [esp + 0x14], edx $sequence_6 = { e8???????? 83c40c 6a00 6800100000 6a00 50 e8???????? } // n = 7, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 6a00 | push 0 // 6800100000 | push 0x1000 // 6a00 | push 0 // 50 | push eax // e8???????? | $sequence_7 = { 51 ffd7 8b9694800200 52 ffd7 8b8698800200 50 } // n = 7, score = 100 // 51 | push ecx // ffd7 | call edi // 8b9694800200 | mov edx, dword ptr [esi + 0x28094] // 52 | push edx // ffd7 | call edi // 8b8698800200 | mov eax, dword ptr [esi + 0x28098] // 50 | push eax $sequence_8 = { 50 e8???????? 85c0 0f8cd6020000 8b4e1c 03c8 894e1c } // n = 7, score = 100 // 50 | push eax // e8???????? | // 85c0 | test eax, eax // 0f8cd6020000 | jl 0x2dc // 8b4e1c | mov ecx, dword ptr [esi + 0x1c] // 03c8 | add ecx, eax // 894e1c | mov dword ptr [esi + 0x1c], ecx $sequence_9 = { 3bc6 8b5008 895610 75a7 e9???????? 8b85a0020000 8db598020000 } // n = 7, score = 100 // 3bc6 | cmp eax, esi // 8b5008 | mov edx, dword ptr [eax + 8] // 895610 | mov dword ptr [esi + 0x10], edx // 75a7 | jne 0xffffffa9 // e9???????? | // 8b85a0020000 | mov eax, dword ptr [ebp + 0x2a0] // 8db598020000 | lea esi, [ebp + 0x298] condition: 7 of them and filesize < 1138688 }
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