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rule win_webc2_greencat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 57 50 e8???????? 59 8bd8 59 eb03 } // n = 7, score = 100 // 57 | push edi // 50 | push eax // e8???????? | // 59 | pop ecx // 8bd8 | mov ebx, eax // 59 | pop ecx // eb03 | jmp 5 $sequence_1 = { 59 59 e9???????? ff35???????? ff15???????? 3bc6 } // n = 6, score = 100 // 59 | pop ecx // 59 | pop ecx // e9???????? | // ff35???????? | // ff15???????? | // 3bc6 | cmp eax, esi $sequence_2 = { 33f6 895df4 8d450c 50 ff35???????? ff15???????? 817d0c03010000 } // n = 7, score = 100 // 33f6 | xor esi, esi // 895df4 | mov dword ptr [ebp - 0xc], ebx // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // ff35???????? | // ff15???????? | // 817d0c03010000 | cmp dword ptr [ebp + 0xc], 0x103 $sequence_3 = { 395ddc 752d 391d???????? 7525 3bf3 7521 } // n = 6, score = 100 // 395ddc | cmp dword ptr [ebp - 0x24], ebx // 752d | jne 0x2f // 391d???????? | // 7525 | jne 0x27 // 3bf3 | cmp esi, ebx // 7521 | jne 0x23 $sequence_4 = { e8???????? 83c418 53 6a02 } // n = 4, score = 100 // e8???????? | // 83c418 | add esp, 0x18 // 53 | push ebx // 6a02 | push 2 $sequence_5 = { 8d85fcfeffff 33ff 6804010000 50 } // n = 4, score = 100 // 8d85fcfeffff | lea eax, [ebp - 0x104] // 33ff | xor edi, edi // 6804010000 | push 0x104 // 50 | push eax $sequence_6 = { 50 53 ff15???????? 33c9 8945f0 } // n = 5, score = 100 // 50 | push eax // 53 | push ebx // ff15???????? | // 33c9 | xor ecx, ecx // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_7 = { 8bf0 395ddc 752d 391d???????? 7525 3bf3 7521 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 395ddc | cmp dword ptr [ebp - 0x24], ebx // 752d | jne 0x2f // 391d???????? | // 7525 | jne 0x27 // 3bf3 | cmp esi, ebx // 7521 | jne 0x23 $sequence_8 = { ff75fc ff15???????? 83c428 53 6880000000 } // n = 5, score = 100 // ff75fc | push dword ptr [ebp - 4] // ff15???????? | // 83c428 | add esp, 0x28 // 53 | push ebx // 6880000000 | push 0x80 $sequence_9 = { 0fbe4007 83e830 8945f8 8d85f8fdffff 50 } // n = 5, score = 100 // 0fbe4007 | movsx eax, byte ptr [eax + 7] // 83e830 | sub eax, 0x30 // 8945f8 | mov dword ptr [ebp - 8], eax // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax condition: 7 of them and filesize < 57344 }
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