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rule win_webc2_cson_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.webc2_cson." 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_cson" 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 = { c745f401000000 ff15???????? 85c0 7507 } // n = 4, score = 100 // c745f401000000 | mov dword ptr [ebp - 0xc], 1 // ff15???????? | // 85c0 | test eax, eax // 7507 | jne 9 $sequence_1 = { 66a1???????? 56 57 6a1f 66894580 59 } // n = 6, score = 100 // 66a1???????? | // 56 | push esi // 57 | push edi // 6a1f | push 0x1f // 66894580 | mov word ptr [ebp - 0x80], ax // 59 | pop ecx $sequence_2 = { 395dfc 7637 56 8d85ec6bfeff 53 50 } // n = 6, score = 100 // 395dfc | cmp dword ptr [ebp - 4], ebx // 7637 | jbe 0x39 // 56 | push esi // 8d85ec6bfeff | lea eax, dword ptr [ebp - 0x19414] // 53 | push ebx // 50 | push eax $sequence_3 = { 8d85c0feffff 50 e8???????? 83c444 } // n = 4, score = 100 // 8d85c0feffff | lea eax, dword ptr [ebp - 0x140] // 50 | push eax // e8???????? | // 83c444 | add esp, 0x44 $sequence_4 = { 6a7f 33c0 59 8dbd41fdffff 889d40fdffff 895dfc } // n = 6, score = 100 // 6a7f | push 0x7f // 33c0 | xor eax, eax // 59 | pop ecx // 8dbd41fdffff | lea edi, dword ptr [ebp - 0x2bf] // 889d40fdffff | mov byte ptr [ebp - 0x2c0], bl // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_5 = { 8dbded6bfeff 889dec6bfeff f3ab 66ab aa 8d45ec } // n = 6, score = 100 // 8dbded6bfeff | lea edi, dword ptr [ebp - 0x19413] // 889dec6bfeff | mov byte ptr [ebp - 0x19414], bl // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 8d45ec | lea eax, dword ptr [ebp - 0x14] $sequence_6 = { 57 e8???????? 83c438 eb9e } // n = 4, score = 100 // 57 | push edi // e8???????? | // 83c438 | add esp, 0x38 // eb9e | jmp 0xffffffa0 $sequence_7 = { 53 53 bf???????? 6a03 } // n = 4, score = 100 // 53 | push ebx // 53 | push ebx // bf???????? | // 6a03 | push 3 $sequence_8 = { 0f843d010000 83e803 0f8414010000 83e803 0f84ef000000 83e805 0f8496000000 } // n = 7, score = 100 // 0f843d010000 | je 0x143 // 83e803 | sub eax, 3 // 0f8414010000 | je 0x11a // 83e803 | sub eax, 3 // 0f84ef000000 | je 0xf5 // 83e805 | sub eax, 5 // 0f8496000000 | je 0x9c $sequence_9 = { 68???????? b8???????? 6a03 50 50 8d45a0 53 } // n = 7, score = 100 // 68???????? | // b8???????? | // 6a03 | push 3 // 50 | push eax // 50 | push eax // 8d45a0 | lea eax, dword ptr [ebp - 0x60] // 53 | push ebx condition: 7 of them and filesize < 98304 }
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