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rule win_webc2_greencat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.webc2_greencat." 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_greencat" 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 = { 895da4 ff15???????? 85c0 0f842e030000 8d8598feffff 6804010000 } // n = 6, score = 100 // 895da4 | mov dword ptr [ebp - 0x5c], ebx // ff15???????? | // 85c0 | test eax, eax // 0f842e030000 | je 0x334 // 8d8598feffff | lea eax, dword ptr [ebp - 0x168] // 6804010000 | push 0x104 $sequence_1 = { e8???????? 83c40c be???????? ff35???????? 56 ff15???????? } // n = 6, score = 100 // e8???????? | // 83c40c | add esp, 0xc // be???????? | // ff35???????? | // 56 | push esi // ff15???????? | $sequence_2 = { 8d4307 eb0a c745fc01000000 8d4308 50 57 } // n = 6, score = 100 // 8d4307 | lea eax, dword ptr [ebx + 7] // eb0a | jmp 0xc // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 8d4308 | lea eax, dword ptr [ebx + 8] // 50 | push eax // 57 | push edi $sequence_3 = { 57 56 8d8594feffff 56 } // n = 4, score = 100 // 57 | push edi // 56 | push esi // 8d8594feffff | lea eax, dword ptr [ebp - 0x16c] // 56 | push esi $sequence_4 = { 68???????? 53 e8???????? 8d8594feffff 50 } // n = 5, score = 100 // 68???????? | // 53 | push ebx // e8???????? | // 8d8594feffff | lea eax, dword ptr [ebp - 0x16c] // 50 | push eax $sequence_5 = { 83f839 7ef6 8d45bc 68???????? 50 e8???????? } // n = 6, score = 100 // 83f839 | cmp eax, 0x39 // 7ef6 | jle 0xfffffff8 // 8d45bc | lea eax, dword ptr [ebp - 0x44] // 68???????? | // 50 | push eax // e8???????? | $sequence_6 = { 57 e8???????? 83c40c 68???????? 6a01 53 ff15???????? } // n = 7, score = 100 // 57 | push edi // e8???????? | // 83c40c | add esp, 0xc // 68???????? | // 6a01 | push 1 // 53 | push ebx // ff15???????? | $sequence_7 = { 8b75d4 56 e8???????? 56 } // n = 4, score = 100 // 8b75d4 | mov esi, dword ptr [ebp - 0x2c] // 56 | push esi // e8???????? | // 56 | push esi $sequence_8 = { ff15???????? 83f8ff 8945ec 7411 ff15???????? 3db7000000 0f84de010000 } // n = 7, score = 100 // ff15???????? | // 83f8ff | cmp eax, -1 // 8945ec | mov dword ptr [ebp - 0x14], eax // 7411 | je 0x13 // ff15???????? | // 3db7000000 | cmp eax, 0xb7 // 0f84de010000 | je 0x1e4 $sequence_9 = { 53 6800000040 eb0f 57 6880000000 6a03 } // n = 6, score = 100 // 53 | push ebx // 6800000040 | push 0x40000000 // eb0f | jmp 0x11 // 57 | push edi // 6880000000 | push 0x80 // 6a03 | push 3 condition: 7 of them and filesize < 57344 }
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