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rule win_webc2_head_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_head" 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 = { 8ac8 80c120 8888e0b84000 eb1f } // n = 4, score = 100 // 8ac8 | mov cl, al // 80c120 | add cl, 0x20 // 8888e0b84000 | mov byte ptr [eax + 0x40b8e0], cl // eb1f | jmp 0x21 $sequence_1 = { f3a5 8bc8 33c0 83e103 f3a4 8d7a02 } // n = 6, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 33c0 | xor eax, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d7a02 | lea edi, [edx + 2] $sequence_2 = { 7505 b83f000000 c3 81ec6c010000 } // n = 4, score = 100 // 7505 | jne 7 // b83f000000 | mov eax, 0x3f // c3 | ret // 81ec6c010000 | sub esp, 0x16c $sequence_3 = { 5f 5e b802000000 5b 81c46c010000 } // n = 5, score = 100 // 5f | pop edi // 5e | pop esi // b802000000 | mov eax, 2 // 5b | pop ebx // 81c46c010000 | add esp, 0x16c $sequence_4 = { 89442418 895c2410 8944241c ff15???????? 85c0 0f84c9010000 } // n = 6, score = 100 // 89442418 | mov dword ptr [esp + 0x18], eax // 895c2410 | mov dword ptr [esp + 0x10], ebx // 8944241c | mov dword ptr [esp + 0x1c], eax // ff15???????? | // 85c0 | test eax, eax // 0f84c9010000 | je 0x1cf $sequence_5 = { 8943fc 4a 894c2420 0f8550ffffff 8b542424 8b4c241c } // n = 6, score = 100 // 8943fc | mov dword ptr [ebx - 4], eax // 4a | dec edx // 894c2420 | mov dword ptr [esp + 0x20], ecx // 0f8550ffffff | jne 0xffffff56 // 8b542424 | mov edx, dword ptr [esp + 0x24] // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] $sequence_6 = { 8d442414 53 50 8d8c24d4030000 6800020000 } // n = 5, score = 100 // 8d442414 | lea eax, [esp + 0x14] // 53 | push ebx // 50 | push eax // 8d8c24d4030000 | lea ecx, [esp + 0x3d4] // 6800020000 | push 0x200 $sequence_7 = { 0f8444030000 b900010000 33c0 bf???????? 68???????? f3ab 68???????? } // n = 7, score = 100 // 0f8444030000 | je 0x34a // b900010000 | mov ecx, 0x100 // 33c0 | xor eax, eax // bf???????? | // 68???????? | // f3ab | rep stosd dword ptr es:[edi], eax // 68???????? | $sequence_8 = { 7d09 8a8404ec000000 eb02 b03d 83fb02 } // n = 5, score = 100 // 7d09 | jge 0xb // 8a8404ec000000 | mov al, byte ptr [esp + eax + 0xec] // eb02 | jmp 4 // b03d | mov al, 0x3d // 83fb02 | cmp ebx, 2 $sequence_9 = { 884502 7e2a b910000000 be???????? 8dbc2474010000 } // n = 5, score = 100 // 884502 | mov byte ptr [ebp + 2], al // 7e2a | jle 0x2c // b910000000 | mov ecx, 0x10 // be???????? | // 8dbc2474010000 | lea edi, [esp + 0x174] condition: 7 of them and filesize < 106496 }
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