Actor(s): APT37
There is no description at this point.
rule win_chinotto_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.chinotto." 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.chinotto" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { c7458035003300 c7458437002e00 c7458833003600 c7458c20002800 c745904b004800 c7459454004d00 } // n = 6, score = 100 // c7458035003300 | mov dword ptr [ebp - 0x80], 0x330035 // c7458437002e00 | mov dword ptr [ebp - 0x7c], 0x2e0037 // c7458833003600 | mov dword ptr [ebp - 0x78], 0x360033 // c7458c20002800 | mov dword ptr [ebp - 0x74], 0x280020 // c745904b004800 | mov dword ptr [ebp - 0x70], 0x48004b // c7459454004d00 | mov dword ptr [ebp - 0x6c], 0x4d0054 $sequence_1 = { 52 53 56 57 c7859cf6ffff00000000 ff15???????? 57 } // n = 7, score = 100 // 52 | push edx // 53 | push ebx // 56 | push esi // 57 | push edi // c7859cf6ffff00000000 | mov dword ptr [ebp - 0x964], 0 // ff15???????? | // 57 | push edi $sequence_2 = { 8bd8 e8???????? 8d95e0fbffff 2bd0 8da42400000000 0fb708 66890c02 } // n = 7, score = 100 // 8bd8 | mov ebx, eax // e8???????? | // 8d95e0fbffff | lea edx, [ebp - 0x420] // 2bd0 | sub edx, eax // 8da42400000000 | lea esp, [esp] // 0fb708 | movzx ecx, word ptr [eax] // 66890c02 | mov word ptr [edx + eax], cx $sequence_3 = { 8bcf 81e1ff0f0000 83c102 b856555555 f7e9 8bca } // n = 6, score = 100 // 8bcf | mov ecx, edi // 81e1ff0f0000 | and ecx, 0xfff // 83c102 | add ecx, 2 // b856555555 | mov eax, 0x55555556 // f7e9 | imul ecx // 8bca | mov ecx, edx $sequence_4 = { e8???????? 8be5 5d c3 8d95bcf3ffff } // n = 5, score = 100 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8d95bcf3ffff | lea edx, [ebp - 0xc44] $sequence_5 = { 83c404 85c0 7563 8b4e3c 8b7e28 8b5e2c } // n = 6, score = 100 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7563 | jne 0x65 // 8b4e3c | mov ecx, dword ptr [esi + 0x3c] // 8b7e28 | mov edi, dword ptr [esi + 0x28] // 8b5e2c | mov ebx, dword ptr [esi + 0x2c] $sequence_6 = { 6a00 6a00 ff15???????? 8b35???????? 53 ffd6 68???????? } // n = 7, score = 100 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8b35???????? | // 53 | push ebx // ffd6 | call esi // 68???????? | $sequence_7 = { 0f84b7010000 8d5603 85d2 0f84b1000000 83c606 } // n = 5, score = 100 // 0f84b7010000 | je 0x1bd // 8d5603 | lea edx, [esi + 3] // 85d2 | test edx, edx // 0f84b1000000 | je 0xb7 // 83c606 | add esi, 6 $sequence_8 = { 89463c 6a00 8bc6 895624 897e28 895e2c 894e38 } // n = 7, score = 100 // 89463c | mov dword ptr [esi + 0x3c], eax // 6a00 | push 0 // 8bc6 | mov eax, esi // 895624 | mov dword ptr [esi + 0x24], edx // 897e28 | mov dword ptr [esi + 0x28], edi // 895e2c | mov dword ptr [esi + 0x2c], ebx // 894e38 | mov dword ptr [esi + 0x38], ecx $sequence_9 = { eb03 8b7508 8b465c 33ff } // n = 4, score = 100 // eb03 | jmp 5 // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b465c | mov eax, dword ptr [esi + 0x5c] // 33ff | xor edi, edi condition: 7 of them and filesize < 300032 }
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