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rule win_webc2_head_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_head." 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_head" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 5b 81c46c010000 c3 395c240c 7474 } // n = 5, score = 100 // 5b | pop ebx // 81c46c010000 | add esp, 0x16c // c3 | ret // 395c240c | cmp dword ptr [esp + 0xc], ebx // 7474 | je 0x76 $sequence_1 = { e8???????? 83c410 8d4c2418 8d942444080000 03f0 } // n = 5, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // 8d4c2418 | lea ecx, [esp + 0x18] // 8d942444080000 | lea edx, [esp + 0x844] // 03f0 | add esi, eax $sequence_2 = { 55 ffd3 85c0 74e9 6a00 } // n = 5, score = 100 // 55 | push ebp // ffd3 | call ebx // 85c0 | test eax, eax // 74e9 | je 0xffffffeb // 6a00 | push 0 $sequence_3 = { 8a440438 eb02 b03d 8b4c2410 be???????? 8d7c2438 8801 } // n = 7, score = 100 // 8a440438 | mov al, byte ptr [esp + eax + 0x38] // eb02 | jmp 4 // b03d | mov al, 0x3d // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // be???????? | // 8d7c2438 | lea edi, [esp + 0x38] // 8801 | mov byte ptr [ecx], al $sequence_4 = { 0fb6fa 3bc7 7714 8b55fc 8a9220994000 } // n = 5, score = 100 // 0fb6fa | movzx edi, dl // 3bc7 | cmp eax, edi // 7714 | ja 0x16 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8a9220994000 | mov dl, byte ptr [edx + 0x409920] $sequence_5 = { 7d09 8a8c0cb8010000 eb02 b13d 0fbef9 8bc8 8bf0 } // n = 7, score = 100 // 7d09 | jge 0xb // 8a8c0cb8010000 | mov cl, byte ptr [esp + ecx + 0x1b8] // eb02 | jmp 4 // b13d | mov cl, 0x3d // 0fbef9 | movsx edi, cl // 8bc8 | mov ecx, eax // 8bf0 | mov esi, eax $sequence_6 = { ff15???????? 85c0 0f840c050000 68e8030000 ff15???????? 8b542420 b980000000 } // n = 7, score = 100 // ff15???????? | // 85c0 | test eax, eax // 0f840c050000 | je 0x512 // 68e8030000 | push 0x3e8 // ff15???????? | // 8b542420 | mov edx, dword ptr [esp + 0x20] // b980000000 | mov ecx, 0x80 $sequence_7 = { b900050000 bf???????? f3ab 8b442410 8bc8 } // n = 5, score = 100 // b900050000 | mov ecx, 0x500 // bf???????? | // f3ab | rep stosd dword ptr es:[edi], eax // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8bc8 | mov ecx, eax $sequence_8 = { f3a4 8344241003 8dbc24c8030000 83c9ff } // n = 4, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8344241003 | add dword ptr [esp + 0x10], 3 // 8dbc24c8030000 | lea edi, [esp + 0x3c8] // 83c9ff | or ecx, 0xffffffff $sequence_9 = { 6a1f 55 ff15???????? 8b3d???????? 6a04 81cf00330000 } // n = 6, score = 100 // 6a1f | push 0x1f // 55 | push ebp // ff15???????? | // 8b3d???????? | // 6a04 | push 4 // 81cf00330000 | or edi, 0x3300 condition: 7 of them and filesize < 106496 }
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