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rule win_webc2_cson_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.webc2_cson." 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.webc2_cson" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 c9 c20400 c605????????01 be00900100 } // n = 5, score = 100 // 5b | pop ebx // c9 | leave // c20400 | ret 4 // c605????????01 | // be00900100 | mov esi, 0x19000 $sequence_1 = { eb2a 8d45c0 68???????? 50 ff15???????? 59 } // n = 6, score = 100 // eb2a | jmp 0x2c // 8d45c0 | lea eax, [ebp - 0x40] // 68???????? | // 50 | push eax // ff15???????? | // 59 | pop ecx $sequence_2 = { 53 ff15???????? 85c0 7515 53 ffd6 55 } // n = 7, score = 100 // 53 | push ebx // ff15???????? | // 85c0 | test eax, eax // 7515 | jne 0x17 // 53 | push ebx // ffd6 | call esi // 55 | push ebp $sequence_3 = { c745f420000000 ffd6 8d8540ffffff 50 ff15???????? } // n = 5, score = 100 // c745f420000000 | mov dword ptr [ebp - 0xc], 0x20 // ffd6 | call esi // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // ff15???????? | $sequence_4 = { e8???????? 83f807 59 730a } // n = 4, score = 100 // e8???????? | // 83f807 | cmp eax, 7 // 59 | pop ecx // 730a | jae 0xc $sequence_5 = { 8d8540ffffff 50 e8???????? 8d8540ffffff 50 e8???????? } // n = 6, score = 100 // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // e8???????? | // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // e8???????? | $sequence_6 = { 7512 55 ffd6 57 } // n = 4, score = 100 // 7512 | jne 0x14 // 55 | push ebp // ffd6 | call esi // 57 | push edi $sequence_7 = { 50 e8???????? 8d45c0 50 8d8540ffffff 50 e8???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8d45c0 | lea eax, [ebp - 0x40] // 50 | push eax // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // e8???????? | $sequence_8 = { 59 33c0 8dbdc1feffff 889dc0feffff } // n = 4, score = 100 // 59 | pop ecx // 33c0 | xor eax, eax // 8dbdc1feffff | lea edi, [ebp - 0x13f] // 889dc0feffff | mov byte ptr [ebp - 0x140], bl $sequence_9 = { 50 ff15???????? 8b35???????? 8d85c4fdffff 50 } // n = 5, score = 100 // 50 | push eax // ff15???????? | // 8b35???????? | // 8d85c4fdffff | lea eax, [ebp - 0x23c] // 50 | push eax condition: 7 of them and filesize < 98304 }
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