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rule win_webc2_ugx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.webc2_ugx." 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_ugx" 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 = { 8d85e0fbffff 50 ff55e8 8d8568ffffff } // n = 4, score = 100 // 8d85e0fbffff | lea eax, dword ptr [ebp - 0x420] // 50 | push eax // ff55e8 | call dword ptr [ebp - 0x18] // 8d8568ffffff | lea eax, dword ptr [ebp - 0x98] $sequence_1 = { ff55ac 53 53 8d85e4fdffff 53 50 } // n = 6, score = 100 // ff55ac | call dword ptr [ebp - 0x54] // 53 | push ebx // 53 | push ebx // 8d85e4fdffff | lea eax, dword ptr [ebp - 0x21c] // 53 | push ebx // 50 | push eax $sequence_2 = { 0f84d3000000 6800100000 6a40 ff5594 8bf8 } // n = 5, score = 100 // 0f84d3000000 | je 0xd9 // 6800100000 | push 0x1000 // 6a40 | push 0x40 // ff5594 | call dword ptr [ebp - 0x6c] // 8bf8 | mov edi, eax $sequence_3 = { 8d8678030000 50 ff55b0 83c410 8d8568ffffff 66c7857cffffff0200 50 } // n = 7, score = 100 // 8d8678030000 | lea eax, dword ptr [esi + 0x378] // 50 | push eax // ff55b0 | call dword ptr [ebp - 0x50] // 83c410 | add esp, 0x10 // 8d8568ffffff | lea eax, dword ptr [ebp - 0x98] // 66c7857cffffff0200 | mov word ptr [ebp - 0x84], 2 // 50 | push eax $sequence_4 = { 50 53 53 ff55cc e9???????? 8d85ccfeffff } // n = 6, score = 100 // 50 | push eax // 53 | push ebx // 53 | push ebx // ff55cc | call dword ptr [ebp - 0x34] // e9???????? | // 8d85ccfeffff | lea eax, dword ptr [ebp - 0x134] $sequence_5 = { 6a01 58 8a8c0584f9ffff 3acb 740c 888c0583fcffff 40 } // n = 7, score = 100 // 6a01 | push 1 // 58 | pop eax // 8a8c0584f9ffff | mov cl, byte ptr [ebp + eax - 0x67c] // 3acb | cmp cl, bl // 740c | je 0xe // 888c0583fcffff | mov byte ptr [ebp + eax - 0x37d], cl // 40 | inc eax $sequence_6 = { 6a10 50 57 ff55a8 83f8ff } // n = 5, score = 100 // 6a10 | push 0x10 // 50 | push eax // 57 | push edi // ff55a8 | call dword ptr [ebp - 0x58] // 83f8ff | cmp eax, -1 $sequence_7 = { 85c0 745d 8d45e4 50 57 68???????? ff75bc } // n = 7, score = 100 // 85c0 | test eax, eax // 745d | je 0x5f // 8d45e4 | lea eax, dword ptr [ebp - 0x1c] // 50 | push eax // 57 | push edi // 68???????? | // ff75bc | push dword ptr [ebp - 0x44] $sequence_8 = { ff75b4 ff16 ff75ec ff16 5f 5e 5b } // n = 7, score = 100 // ff75b4 | push dword ptr [ebp - 0x4c] // ff16 | call dword ptr [esi] // ff75ec | push dword ptr [ebp - 0x14] // ff16 | call dword ptr [esi] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_9 = { 57 6a40 33c0 59 8dbdf5feffff } // n = 5, score = 100 // 57 | push edi // 6a40 | push 0x40 // 33c0 | xor eax, eax // 59 | pop ecx // 8dbdf5feffff | lea edi, dword ptr [ebp - 0x10b] condition: 7 of them and filesize < 57344 }
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