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rule win_webc2_greencat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { ff75e8 ffd3 ff75ec ffd3 eb27 ff15???????? 50 } // n = 7, score = 100 // ff75e8 | push dword ptr [ebp - 0x18] // ffd3 | call ebx // ff75ec | push dword ptr [ebp - 0x14] // ffd3 | call ebx // eb27 | jmp 0x29 // ff15???????? | // 50 | push eax $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 = { 8d4dfc 51 6800100000 53 50 } // n = 5, score = 100 // 8d4dfc | lea ecx, [ebp - 4] // 51 | push ecx // 6800100000 | push 0x1000 // 53 | push ebx // 50 | push eax $sequence_3 = { 53 ff15???????? 55 e8???????? 3bf3 59 7407 } // n = 7, score = 100 // 53 | push ebx // ff15???????? | // 55 | push ebp // e8???????? | // 3bf3 | cmp esi, ebx // 59 | pop ecx // 7407 | je 9 $sequence_4 = { 59 0f85ab000000 bf28010000 8d85c0fdffff } // n = 4, score = 100 // 59 | pop ecx // 0f85ab000000 | jne 0xb1 // bf28010000 | mov edi, 0x128 // 8d85c0fdffff | lea eax, [ebp - 0x240] $sequence_5 = { 397dec 750f 8d8578ffffff 8d4db8 50 e8???????? } // n = 6, score = 100 // 397dec | cmp dword ptr [ebp - 0x14], edi // 750f | jne 0x11 // 8d8578ffffff | lea eax, [ebp - 0x88] // 8d4db8 | lea ecx, [ebp - 0x48] // 50 | push eax // e8???????? | $sequence_6 = { 56 57 53 ff15???????? 57 68???????? ff75fc } // n = 7, score = 100 // 56 | push esi // 57 | push edi // 53 | push ebx // ff15???????? | // 57 | push edi // 68???????? | // ff75fc | push dword ptr [ebp - 4] $sequence_7 = { 50 0fb745e4 50 8d8710020000 ffb550ffffff ffb54cffffff 68???????? } // n = 7, score = 100 // 50 | push eax // 0fb745e4 | movzx eax, word ptr [ebp - 0x1c] // 50 | push eax // 8d8710020000 | lea eax, [edi + 0x210] // ffb550ffffff | push dword ptr [ebp - 0xb0] // ffb54cffffff | push dword ptr [ebp - 0xb4] // 68???????? | $sequence_8 = { 881c38 ff15???????? ff75fc 57 e8???????? be???????? 8d4588 } // n = 7, score = 100 // 881c38 | mov byte ptr [eax + edi], bl // ff15???????? | // ff75fc | push dword ptr [ebp - 4] // 57 | push edi // e8???????? | // be???????? | // 8d4588 | lea eax, [ebp - 0x78] $sequence_9 = { 80f90a 7405 46 3bf0 72ea 803c3e0d } // n = 6, score = 100 // 80f90a | cmp cl, 0xa // 7405 | je 7 // 46 | inc esi // 3bf0 | cmp esi, eax // 72ea | jb 0xffffffec // 803c3e0d | cmp byte ptr [esi + edi], 0xd condition: 7 of them and filesize < 57344 }
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