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rule win_webc2_div_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_div." 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_div" 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 = { 8975f8 f3ab 66ab aa 8d45f8 } // n = 5, score = 100 // 8975f8 | mov dword ptr [ebp - 8], esi // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 8d45f8 | lea eax, [ebp - 8] $sequence_1 = { 8b542410 8b35???????? 52 ffd6 6801000080 ffd6 } // n = 6, score = 100 // 8b542410 | mov edx, dword ptr [esp + 0x10] // 8b35???????? | // 52 | push edx // ffd6 | call esi // 6801000080 | push 0x80000001 // ffd6 | call esi $sequence_2 = { 5f e9???????? 6a3c 51 e9???????? 85c0 0f842c010000 } // n = 7, score = 100 // 5f | pop edi // e9???????? | // 6a3c | push 0x3c // 51 | push ecx // e9???????? | // 85c0 | test eax, eax // 0f842c010000 | je 0x132 $sequence_3 = { 894508 7509 57 ff15???????? eb54 a0???????? b9ff000000 } // n = 7, score = 100 // 894508 | mov dword ptr [ebp + 8], eax // 7509 | jne 0xb // 57 | push edi // ff15???????? | // eb54 | jmp 0x56 // a0???????? | // b9ff000000 | mov ecx, 0xff $sequence_4 = { 6a00 ff15???????? 8b54240c 8d4c2414 51 52 } // n = 6, score = 100 // 6a00 | push 0 // ff15???????? | // 8b54240c | mov edx, dword ptr [esp + 0xc] // 8d4c2414 | lea ecx, [esp + 0x14] // 51 | push ecx // 52 | push edx $sequence_5 = { 3c7a 7f08 0fbed0 83ea61 eb21 3c2e 7c0f } // n = 7, score = 100 // 3c7a | cmp al, 0x7a // 7f08 | jg 0xa // 0fbed0 | movsx edx, al // 83ea61 | sub edx, 0x61 // eb21 | jmp 0x23 // 3c2e | cmp al, 0x2e // 7c0f | jl 0x11 $sequence_6 = { 7512 ffd6 ff75fc ffd6 53 e8???????? 59 } // n = 7, score = 100 // 7512 | jne 0x14 // ffd6 | call esi // ff75fc | push dword ptr [ebp - 4] // ffd6 | call esi // 53 | push ebx // e8???????? | // 59 | pop ecx $sequence_7 = { 8b35???????? 6a3c ff74241c ffd6 59 } // n = 5, score = 100 // 8b35???????? | // 6a3c | push 0x3c // ff74241c | push dword ptr [esp + 0x1c] // ffd6 | call esi // 59 | pop ecx $sequence_8 = { aa 8d45f8 50 8d85ecf9ffff 6800040000 50 ff7508 } // n = 7, score = 100 // aa | stosb byte ptr es:[edi], al // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 8d85ecf9ffff | lea eax, [ebp - 0x614] // 6800040000 | push 0x400 // 50 | push eax // ff7508 | push dword ptr [ebp + 8] $sequence_9 = { 8ac8 80c161 eb1a 83f826 7f0b } // n = 5, score = 100 // 8ac8 | mov cl, al // 80c161 | add cl, 0x61 // eb1a | jmp 0x1c // 83f826 | cmp eax, 0x26 // 7f0b | jg 0xd condition: 7 of them and filesize < 32768 }
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