Actor(s): TA428
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rule win_cotx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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????????890e9944 c705????????dbd99823 c705????????d468bcb5 c705????????a1a14538 c705????????2086e659 } // n = 5, score = 500 // c705????????890e9944 | // c705????????dbd99823 | // c705????????d468bcb5 | // c705????????a1a14538 | // c705????????2086e659 | $sequence_1 = { 740e 3d10b6afa6 7407 3d36ce164d } // n = 4, score = 500 // 740e | je 0x10 // 3d10b6afa6 | cmp eax, 0xa6afb610 // 7407 | je 9 // 3d36ce164d | cmp eax, 0x4d16ce36 $sequence_2 = { 6800f00000 81c600f00000 68???????? 56 e8???????? } // n = 5, score = 500 // 6800f00000 | push 0xf000 // 81c600f00000 | add esi, 0xf000 // 68???????? | // 56 | push esi // e8???????? | $sequence_3 = { 50 51 8d85bcebffff 50 56 } // n = 5, score = 500 // 50 | push eax // 51 | push ecx // 8d85bcebffff | lea eax, [ebp - 0x1444] // 50 | push eax // 56 | push esi $sequence_4 = { c705????????d468bcb5 c705????????a1a14538 c705????????2086e659 c705????????eec45abf } // n = 4, score = 500 // c705????????d468bcb5 | // c705????????a1a14538 | // c705????????2086e659 | // c705????????eec45abf | $sequence_5 = { c705????????9cb95b4c c705????????2d494a94 c705????????8db133d4 c705????????8e220b1d } // n = 4, score = 500 // c705????????9cb95b4c | // c705????????2d494a94 | // c705????????8db133d4 | // c705????????8e220b1d | $sequence_6 = { 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] $sequence_7 = { 8d850af8ffff c78500f8ffff52617354 6a00 50 } // n = 4, score = 500 // 8d850af8ffff | lea eax, [ebp - 0x7f6] // c78500f8ffff52617354 | mov dword ptr [ebp - 0x800], 0x54736152 // 6a00 | push 0 // 50 | push eax $sequence_8 = { f3a4 50 0f1185a8faffff e8???????? } // n = 4, score = 500 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 50 | push eax // 0f1185a8faffff | movups xmmword ptr [ebp - 0x558], xmm0 // e8???????? | $sequence_9 = { 8bce a3???????? e8???????? 8b15???????? 8b4dfc } // n = 5, score = 500 // 8bce | mov ecx, esi // a3???????? | // e8???????? | // 8b15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] condition: 7 of them and filesize < 1171456 }
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