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rule win_webc2_table_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_table" 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 = { 50 8d85d8faffff 50 e8???????? 8d85d8faffff 50 8d85e4fdffff } // n = 7, score = 100 // 50 | push eax // 8d85d8faffff | lea eax, [ebp - 0x528] // 50 | push eax // e8???????? | // 8d85d8faffff | lea eax, [ebp - 0x528] // 50 | push eax // 8d85e4fdffff | lea eax, [ebp - 0x21c] $sequence_1 = { eb4a 8d851cfcffff 50 8d45d8 50 e8???????? 59 } // n = 7, score = 100 // eb4a | jmp 0x4c // 8d851cfcffff | lea eax, [ebp - 0x3e4] // 50 | push eax // 8d45d8 | lea eax, [ebp - 0x28] // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_2 = { 8d8548fdffff c78548fdffff9c000000 50 ff15???????? } // n = 4, score = 100 // 8d8548fdffff | lea eax, [ebp - 0x2b8] // c78548fdffff9c000000 | mov dword ptr [ebp - 0x2b8], 0x9c // 50 | push eax // ff15???????? | $sequence_3 = { 50 e8???????? 6a01 8d85a0fcffff 68???????? 50 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 6a01 | push 1 // 8d85a0fcffff | lea eax, [ebp - 0x360] // 68???????? | // 50 | push eax $sequence_4 = { 3c4d 7e04 3c5a 7e14 } // n = 4, score = 100 // 3c4d | cmp al, 0x4d // 7e04 | jle 6 // 3c5a | cmp al, 0x5a // 7e14 | jle 0x16 $sequence_5 = { ff15???????? 32c0 eb12 ff75ec } // n = 4, score = 100 // ff15???????? | // 32c0 | xor al, al // eb12 | jmp 0x14 // ff75ec | push dword ptr [ebp - 0x14] $sequence_6 = { 0f8ea5010000 8d8d48ffffff 8945ec 894dfc } // n = 4, score = 100 // 0f8ea5010000 | jle 0x1ab // 8d8d48ffffff | lea ecx, [ebp - 0xb8] // 8945ec | mov dword ptr [ebp - 0x14], eax // 894dfc | mov dword ptr [ebp - 4], ecx $sequence_7 = { 83c444 eb84 ff75fc 8b35???????? } // n = 4, score = 100 // 83c444 | add esp, 0x44 // eb84 | jmp 0xffffff86 // ff75fc | push dword ptr [ebp - 4] // 8b35???????? | $sequence_8 = { 53 50 c785ccfeffff01000000 66899dd0feffff 89bda0feffff } // n = 5, score = 100 // 53 | push ebx // 50 | push eax // c785ccfeffff01000000 | mov dword ptr [ebp - 0x134], 1 // 66899dd0feffff | mov word ptr [ebp - 0x130], bx // 89bda0feffff | mov dword ptr [ebp - 0x160], edi $sequence_9 = { c745e864000000 50 8d851cfeffff 50 ff15???????? } // n = 5, score = 100 // c745e864000000 | mov dword ptr [ebp - 0x18], 0x64 // 50 | push eax // 8d851cfeffff | lea eax, [ebp - 0x1e4] // 50 | push eax // ff15???????? | condition: 7 of them and filesize < 49152 }
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