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rule win_webc2_cson_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8d85acfcffff 59 6a01 50 8d85acfeffff 50 } // n = 6, score = 100 // 8d85acfcffff | lea eax, [ebp - 0x354] // 59 | pop ecx // 6a01 | push 1 // 50 | push eax // 8d85acfeffff | lea eax, [ebp - 0x154] // 50 | push eax $sequence_1 = { 8d7c2419 68???????? f3ab 66ab aa } // n = 5, score = 100 // 8d7c2419 | lea edi, [esp + 0x19] // 68???????? | // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al $sequence_2 = { 8d8500fcffff 6a0a 50 ff7608 ff15???????? 8d8500fcffff } // n = 6, score = 100 // 8d8500fcffff | lea eax, [ebp - 0x400] // 6a0a | push 0xa // 50 | push eax // ff7608 | push dword ptr [esi + 8] // ff15???????? | // 8d8500fcffff | lea eax, [ebp - 0x400] $sequence_3 = { 53 51 ffd0 85c0 0f84a6000000 395df0 7427 } // n = 7, score = 100 // 53 | push ebx // 51 | push ecx // ffd0 | call eax // 85c0 | test eax, eax // 0f84a6000000 | je 0xac // 395df0 | cmp dword ptr [ebp - 0x10], ebx // 7427 | je 0x29 $sequence_4 = { bf???????? 881d???????? 57 56 e8???????? 83c414 } // n = 6, score = 100 // bf???????? | // 881d???????? | // 57 | push edi // 56 | push esi // e8???????? | // 83c414 | add esp, 0x14 $sequence_5 = { 59 8dbd41fdffff 889d40fdffff 895dfc f3ab 66ab aa } // n = 7, score = 100 // 59 | pop ecx // 8dbd41fdffff | lea edi, [ebp - 0x2bf] // 889d40fdffff | mov byte ptr [ebp - 0x2c0], bl // 895dfc | mov dword ptr [ebp - 4], ebx // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al $sequence_6 = { 6a06 be???????? 57 56 e8???????? 53 } // n = 6, score = 100 // 6a06 | push 6 // be???????? | // 57 | push edi // 56 | push esi // e8???????? | // 53 | push ebx $sequence_7 = { be00900100 6800040000 8d85ecfbffff 53 50 e8???????? } // n = 6, score = 100 // be00900100 | mov esi, 0x19000 // 6800040000 | push 0x400 // 8d85ecfbffff | lea eax, [ebp - 0x414] // 53 | push ebx // 50 | push eax // e8???????? | $sequence_8 = { 8d85acfcffff 50 e8???????? 80bc05abfcffff5c 59 7413 } // n = 6, score = 100 // 8d85acfcffff | lea eax, [ebp - 0x354] // 50 | push eax // e8???????? | // 80bc05abfcffff5c | cmp byte ptr [ebp + eax - 0x355], 0x5c // 59 | pop ecx // 7413 | je 0x15 $sequence_9 = { 0f85effeffff 68???????? eb2a 8d45c0 68???????? } // n = 5, score = 100 // 0f85effeffff | jne 0xfffffef5 // 68???????? | // eb2a | jmp 0x2c // 8d45c0 | lea eax, [ebp - 0x40] // 68???????? | condition: 7 of them and filesize < 98304 }
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