Actor(s): TA428
There is no description at this point.
rule win_cotx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.cotx." 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.cotx" 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 = { c705????????5411e14c c705????????2b3d0396 c705????????e54dcca2 c705????????92d61819 c705????????0c56aef3 c705????????c8a4ea05 } // n = 6, score = 500 // c705????????5411e14c | // c705????????2b3d0396 | // c705????????e54dcca2 | // c705????????92d61819 | // c705????????0c56aef3 | // c705????????c8a4ea05 | $sequence_1 = { 50 0f2805???????? 8d85bcfbffff 0f1145d0 } // n = 4, score = 500 // 50 | push eax // 0f2805???????? | // 8d85bcfbffff | lea eax, [ebp - 0x444] // 0f1145d0 | movups xmmword ptr [ebp - 0x30], xmm0 $sequence_2 = { c705????????2b342411 c705????????4a06d5fe c705????????5411e14c c705????????2b3d0396 c705????????e54dcca2 c705????????92d61819 c705????????0c56aef3 } // n = 7, score = 500 // c705????????2b342411 | // c705????????4a06d5fe | // c705????????5411e14c | // c705????????2b3d0396 | // c705????????e54dcca2 | // c705????????92d61819 | // c705????????0c56aef3 | $sequence_3 = { 84c0 75f8 0f2805???????? 8d85bdfaffff 8bca c785b8faffff39313044 } // n = 6, score = 500 // 84c0 | test al, al // 75f8 | jne 0xfffffffa // 0f2805???????? | // 8d85bdfaffff | lea eax, [ebp - 0x543] // 8bca | mov ecx, edx // c785b8faffff39313044 | mov dword ptr [ebp - 0x548], 0x44303139 $sequence_4 = { e8???????? 83c438 8d8500f8ffff 6a00 } // n = 4, score = 500 // e8???????? | // 83c438 | add esp, 0x38 // 8d8500f8ffff | lea eax, [ebp - 0x800] // 6a00 | push 0 $sequence_5 = { 84c0 75f9 8dbd98faffff 2bd6 } // n = 4, score = 500 // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8dbd98faffff | lea edi, [ebp - 0x568] // 2bd6 | sub edx, esi $sequence_6 = { 8d45fc 50 8b8574fdffff 83c008 50 ff75ec ff15???????? } // n = 7, score = 500 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 8b8574fdffff | mov eax, dword ptr [ebp - 0x28c] // 83c008 | add eax, 8 // 50 | push eax // ff75ec | push dword ptr [ebp - 0x14] // ff15???????? | $sequence_7 = { c785b8faffff39313044 c1e902 f3a5 8bca } // n = 4, score = 500 // c785b8faffff39313044 | mov dword ptr [ebp - 0x548], 0x44303139 // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bca | mov ecx, edx $sequence_8 = { c705????????8e220b1d c705????????6825794d c705????????4506ce62 c705????????b60451f0 c705????????3f3f5288 } // n = 5, score = 500 // c705????????8e220b1d | // c705????????6825794d | // c705????????4506ce62 | // c705????????b60451f0 | // c705????????3f3f5288 | $sequence_9 = { 6800040000 8d8598f6ffff 6a00 50 e8???????? 83c40c 8d8598feffff } // n = 7, score = 500 // 6800040000 | push 0x400 // 8d8598f6ffff | lea eax, [ebp - 0x968] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8d8598feffff | lea eax, [ebp - 0x168] condition: 7 of them and filesize < 1171456 }
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