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rule win_zhcat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.zhcat." 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.zhcat" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 7537 68???????? e8???????? e9???????? 8b35???????? } // n = 5, score = 200 // 7537 | jne 0x39 // 68???????? | // e8???????? | // e9???????? | // 8b35???????? | $sequence_1 = { 53 ffd6 8945f4 8d45f0 } // n = 4, score = 200 // 53 | push ebx // ffd6 | call esi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8d45f0 | lea eax, [ebp - 0x10] $sequence_2 = { c705????????02000000 eb1c c605????????01 eb13 c705????????01000000 eb07 c605????????01 } // n = 7, score = 200 // c705????????02000000 | // eb1c | jmp 0x1e // c605????????01 | // eb13 | jmp 0x15 // c705????????01000000 | // eb07 | jmp 9 // c605????????01 | $sequence_3 = { 59 e9???????? 8b36 8bce c1f905 8b0c8d40604100 } // n = 6, score = 200 // 59 | pop ecx // e9???????? | // 8b36 | mov esi, dword ptr [esi] // 8bce | mov ecx, esi // c1f905 | sar ecx, 5 // 8b0c8d40604100 | mov ecx, dword ptr [ecx*4 + 0x416040] $sequence_4 = { 83c418 53 ff750c 8bf0 8d0437 50 e8???????? } // n = 7, score = 200 // 83c418 | add esp, 0x18 // 53 | push ebx // ff750c | push dword ptr [ebp + 0xc] // 8bf0 | mov esi, eax // 8d0437 | lea eax, [edi + esi] // 50 | push eax // e8???????? | $sequence_5 = { ffd7 6a02 8945d8 58 ff7514 668945c4 ffd6 } // n = 7, score = 200 // ffd7 | call edi // 6a02 | push 2 // 8945d8 | mov dword ptr [ebp - 0x28], eax // 58 | pop eax // ff7514 | push dword ptr [ebp + 0x14] // 668945c4 | mov word ptr [ebp - 0x3c], ax // ffd6 | call esi $sequence_6 = { c1f905 8b0c8d40604100 c1e006 8d44010c 50 } // n = 5, score = 200 // c1f905 | sar ecx, 5 // 8b0c8d40604100 | mov ecx, dword ptr [ecx*4 + 0x416040] // c1e006 | shl eax, 6 // 8d44010c | lea eax, [ecx + eax + 0xc] // 50 | push eax $sequence_7 = { 68ff000000 e8???????? 59 59 8b7508 8d34f590444100 391e } // n = 7, score = 200 // 68ff000000 | push 0xff // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d34f590444100 | lea esi, [esi*8 + 0x414490] // 391e | cmp dword ptr [esi], ebx $sequence_8 = { 0fb63e 0fb6c0 eb12 8b45e0 8a80044a4100 08443b1d 0fb64601 } // n = 7, score = 200 // 0fb63e | movzx edi, byte ptr [esi] // 0fb6c0 | movzx eax, al // eb12 | jmp 0x14 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8a80044a4100 | mov al, byte ptr [eax + 0x414a04] // 08443b1d | or byte ptr [ebx + edi + 0x1d], al // 0fb64601 | movzx eax, byte ptr [esi + 1] $sequence_9 = { 8bfb f3a5 66a5 7424 } // n = 4, score = 200 // 8bfb | mov edi, ebx // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 66a5 | movsw word ptr es:[edi], word ptr [esi] // 7424 | je 0x26 condition: 7 of them and filesize < 376832 }
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