Actor(s): TA428
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rule win_cotx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 50 c78504fcffff52643332 c78508fcffff2e657865 e8???????? 83ec20 8d8d00fcffff } // n = 6, score = 500 // 50 | push eax // c78504fcffff52643332 | mov dword ptr [ebp - 0x3fc], 0x32336452 // c78508fcffff2e657865 | mov dword ptr [ebp - 0x3f8], 0x6578652e // e8???????? | // 83ec20 | sub esp, 0x20 // 8d8d00fcffff | lea ecx, [ebp - 0x400] $sequence_1 = { c78504fcffff52643332 c78508fcffff2e657865 e8???????? 83ec20 } // n = 4, score = 500 // c78504fcffff52643332 | mov dword ptr [ebp - 0x3fc], 0x32336452 // c78508fcffff2e657865 | mov dword ptr [ebp - 0x3f8], 0x6578652e // e8???????? | // 83ec20 | sub esp, 0x20 $sequence_2 = { e8???????? 83ec20 8d8d00fcffff e8???????? 68f6030000 8d850af8ffff } // n = 6, score = 500 // e8???????? | // 83ec20 | sub esp, 0x20 // 8d8d00fcffff | lea ecx, [ebp - 0x400] // e8???????? | // 68f6030000 | push 0x3f6 // 8d850af8ffff | lea eax, [ebp - 0x7f6] $sequence_3 = { c705????????0c56aef3 c705????????c8a4ea05 c705????????69e053a4 c705????????120d934e } // n = 4, score = 500 // c705????????0c56aef3 | // c705????????c8a4ea05 | // c705????????69e053a4 | // c705????????120d934e | $sequence_4 = { 8d8d00fcffff e8???????? 68f6030000 8d850af8ffff c78500f8ffff52617354 } // n = 5, score = 500 // 8d8d00fcffff | lea ecx, [ebp - 0x400] // e8???????? | // 68f6030000 | push 0x3f6 // 8d850af8ffff | lea eax, [ebp - 0x7f6] // c78500f8ffff52617354 | mov dword ptr [ebp - 0x800], 0x54736152 $sequence_5 = { 53 6a00 ff75ec ff15???????? } // n = 4, score = 500 // 53 | push ebx // 6a00 | push 0 // ff75ec | push dword ptr [ebp - 0x14] // ff15???????? | $sequence_6 = { 83c40c 0f1145b0 56 50 8d85b0fbffff } // n = 5, score = 500 // 83c40c | add esp, 0xc // 0f1145b0 | movups xmmword ptr [ebp - 0x50], xmm0 // 56 | push esi // 50 | push eax // 8d85b0fbffff | lea eax, [ebp - 0x450] $sequence_7 = { 6a00 ff7508 ff75e4 ff15???????? ff75e4 } // n = 5, score = 500 // 6a00 | push 0 // ff7508 | push dword ptr [ebp + 8] // ff75e4 | push dword ptr [ebp - 0x1c] // ff15???????? | // ff75e4 | push dword ptr [ebp - 0x1c] $sequence_8 = { e8???????? 0f2805???????? 8d45b0 83c40c } // n = 4, score = 500 // e8???????? | // 0f2805???????? | // 8d45b0 | lea eax, [ebp - 0x50] // 83c40c | add esp, 0xc $sequence_9 = { e8???????? 83c40c 8d85c0f2ffff 50 } // n = 4, score = 500 // e8???????? | // 83c40c | add esp, 0xc // 8d85c0f2ffff | lea eax, [ebp - 0xd40] // 50 | push eax condition: 7 of them and filesize < 1171456 }
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