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rule win_webc2_ugx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 50 8d8568ffffff 50 8d4648 50 8d8678030000 50 } // n = 7, score = 100 // 50 | push eax // 8d8568ffffff | lea eax, [ebp - 0x98] // 50 | push eax // 8d4648 | lea eax, [esi + 0x48] // 50 | push eax // 8d8678030000 | lea eax, [esi + 0x378] // 50 | push eax $sequence_1 = { 57 ff969c060000 3bc3 894598 } // n = 4, score = 100 // 57 | push edi // ff969c060000 | call dword ptr [esi + 0x69c] // 3bc3 | cmp eax, ebx // 894598 | mov dword ptr [ebp - 0x68], eax $sequence_2 = { 57 ff7508 ff969c060000 3bc3 894584 0f84d8040000 8d86be090000 } // n = 7, score = 100 // 57 | push edi // ff7508 | push dword ptr [ebp + 8] // ff969c060000 | call dword ptr [esi + 0x69c] // 3bc3 | cmp eax, ebx // 894584 | mov dword ptr [ebp - 0x7c], eax // 0f84d8040000 | je 0x4de // 8d86be090000 | lea eax, [esi + 0x9be] $sequence_3 = { 895db4 ff9698060000 3bc3 894508 } // n = 4, score = 100 // 895db4 | mov dword ptr [ebp - 0x4c], ebx // ff9698060000 | call dword ptr [esi + 0x698] // 3bc3 | cmp eax, ebx // 894508 | mov dword ptr [ebp + 8], eax $sequence_4 = { 8d86f8010000 50 8d8584fdffff 50 ff55ec 8d8584fdffff } // n = 6, score = 100 // 8d86f8010000 | lea eax, [esi + 0x1f8] // 50 | push eax // 8d8584fdffff | lea eax, [ebp - 0x27c] // 50 | push eax // ff55ec | call dword ptr [ebp - 0x14] // 8d8584fdffff | lea eax, [ebp - 0x27c] $sequence_5 = { 5d c20c00 8bc1 832000 83600400 c3 83790400 } // n = 7, score = 100 // 5d | pop ebp // c20c00 | ret 0xc // 8bc1 | mov eax, ecx // 832000 | and dword ptr [eax], 0 // 83600400 | and dword ptr [eax + 4], 0 // c3 | ret // 83790400 | cmp dword ptr [ecx + 4], 0 $sequence_6 = { ff7508 ff969c060000 3bc3 8945b0 0f84eb030000 8d863e0c0000 50 } // n = 7, score = 100 // ff7508 | push dword ptr [ebp + 8] // ff969c060000 | call dword ptr [esi + 0x69c] // 3bc3 | cmp eax, ebx // 8945b0 | mov dword ptr [ebp - 0x50], eax // 0f84eb030000 | je 0x3f1 // 8d863e0c0000 | lea eax, [esi + 0xc3e] // 50 | push eax $sequence_7 = { 56 57 33db 895dfc bf???????? 897ddc } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 33db | xor ebx, ebx // 895dfc | mov dword ptr [ebp - 4], ebx // bf???????? | // 897ddc | mov dword ptr [ebp - 0x24], edi $sequence_8 = { 53 56 ff55f4 ff75fc ff5508 ff75f8 ff5508 } // n = 7, score = 100 // 53 | push ebx // 56 | push esi // ff55f4 | call dword ptr [ebp - 0xc] // ff75fc | push dword ptr [ebp - 4] // ff5508 | call dword ptr [ebp + 8] // ff75f8 | push dword ptr [ebp - 8] // ff5508 | call dword ptr [ebp + 8] $sequence_9 = { 68???????? 8d4df8 e8???????? 8d4df8 e8???????? 68???????? } // n = 6, score = 100 // 68???????? | // 8d4df8 | lea ecx, [ebp - 8] // e8???????? | // 8d4df8 | lea ecx, [ebp - 8] // e8???????? | // 68???????? | condition: 7 of them and filesize < 57344 }
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