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rule win_webc2_greencat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 68???????? 50 ffd7 8b1d???????? 83c40c 8d45b4 } // n = 6, score = 100 // 68???????? | // 50 | push eax // ffd7 | call edi // 8b1d???????? | // 83c40c | add esp, 0xc // 8d45b4 | lea eax, [ebp - 0x4c] $sequence_1 = { 85c0 741b 68???????? ff7508 e8???????? 59 } // n = 6, score = 100 // 85c0 | test eax, eax // 741b | je 0x1d // 68???????? | // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx $sequence_2 = { 40 80f922 75e9 80243a00 8a0430 } // n = 5, score = 100 // 40 | inc eax // 80f922 | cmp cl, 0x22 // 75e9 | jne 0xffffffeb // 80243a00 | and byte ptr [edx + edi], 0 // 8a0430 | mov al, byte ptr [eax + esi] $sequence_3 = { 41 83f97a 7ef7 6a41 } // n = 4, score = 100 // 41 | inc ecx // 83f97a | cmp ecx, 0x7a // 7ef7 | jle 0xfffffff9 // 6a41 | push 0x41 $sequence_4 = { 59 8bd8 59 eb03 8b75f0 ff75f4 } // n = 6, score = 100 // 59 | pop ecx // 8bd8 | mov ebx, eax // 59 | pop ecx // eb03 | jmp 5 // 8b75f0 | mov esi, dword ptr [ebp - 0x10] // ff75f4 | push dword ptr [ebp - 0xc] $sequence_5 = { 7554 8d45f4 c745f404000000 50 8d45fc 50 } // n = 6, score = 100 // 7554 | jne 0x56 // 8d45f4 | lea eax, [ebp - 0xc] // c745f404000000 | mov dword ptr [ebp - 0xc], 4 // 50 | push eax // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_6 = { 50 6a1f ff760c ff15???????? 85c0 7421 } // n = 6, score = 100 // 50 | push eax // 6a1f | push 0x1f // ff760c | push dword ptr [esi + 0xc] // ff15???????? | // 85c0 | test eax, eax // 7421 | je 0x23 $sequence_7 = { 68???????? ff7508 e8???????? 59 59 56 8b35???????? } // n = 7, score = 100 // 68???????? | // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 59 | pop ecx // 56 | push esi // 8b35???????? | $sequence_8 = { 8d45e0 50 ff75f0 ff15???????? 8bd8 83fbff 0f840f010000 } // n = 7, score = 100 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // 8bd8 | mov ebx, eax // 83fbff | cmp ebx, -1 // 0f840f010000 | je 0x115 $sequence_9 = { 53 55 57 55 ff7614 68???????? 50 } // n = 7, score = 100 // 53 | push ebx // 55 | push ebp // 57 | push edi // 55 | push ebp // ff7614 | push dword ptr [esi + 0x14] // 68???????? | // 50 | push eax condition: 7 of them and filesize < 57344 }
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