Actor(s): DragonOK
There is no description at this point.
rule win_new_ct_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.new_ct." 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.new_ct" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8bc1 8bf7 8bfb 8d9a80020000 c1e902 f3a5 } // n = 6, score = 200 // 8bc1 | mov eax, ecx // 8bf7 | mov esi, edi // 8bfb | mov edi, ebx // 8d9a80020000 | lea ebx, [edx + 0x280] // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] $sequence_1 = { 49 8d7c2478 8bf1 83c9ff } // n = 4, score = 200 // 49 | dec ecx // 8d7c2478 | lea edi, [esp + 0x78] // 8bf1 | mov esi, ecx // 83c9ff | or ecx, 0xffffffff $sequence_2 = { 8b470c 83c004 50 e8???????? 83c414 8b7f0c 3bfb } // n = 7, score = 200 // 8b470c | mov eax, dword ptr [edi + 0xc] // 83c004 | add eax, 4 // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 // 8b7f0c | mov edi, dword ptr [edi + 0xc] // 3bfb | cmp edi, ebx $sequence_3 = { 83e103 f3a4 8b4de0 c7410800000000 c745fcffffffff b801000000 } // n = 6, score = 200 // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // c7410800000000 | mov dword ptr [ecx + 8], 0 // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // b801000000 | mov eax, 1 $sequence_4 = { f2ae f7d1 49 740f 6800000020 6aff } // n = 6, score = 200 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 740f | je 0x11 // 6800000020 | push 0x20000000 // 6aff | push -1 $sequence_5 = { 83c9ff 33c0 f2ae f7d1 49 8d7b08 8bd1 } // n = 7, score = 200 // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 49 | dec ecx // 8d7b08 | lea edi, [ebx + 8] // 8bd1 | mov edx, ecx $sequence_6 = { 5f 5e 5d 32c0 5b 81c478020000 } // n = 6, score = 200 // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 32c0 | xor al, al // 5b | pop ebx // 81c478020000 | add esp, 0x278 $sequence_7 = { eb54 8bbc247c0f0000 83c9ff 33c0 f2ae } // n = 5, score = 200 // eb54 | jmp 0x56 // 8bbc247c0f0000 | mov edi, dword ptr [esp + 0xf7c] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] $sequence_8 = { b97f000000 33c0 8dbc24bd050000 c684245801000000 f3ab 66ab aa } // n = 7, score = 200 // b97f000000 | mov ecx, 0x7f // 33c0 | xor eax, eax // 8dbc24bd050000 | lea edi, [esp + 0x5bd] // c684245801000000 | mov byte ptr [esp + 0x158], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al $sequence_9 = { 8bf7 8b7c2410 c1e902 f3a5 8bc8 8b8424c49f0100 83e103 } // n = 7, score = 200 // 8bf7 | mov esi, edi // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 8b8424c49f0100 | mov eax, dword ptr [esp + 0x19fc4] // 83e103 | and ecx, 3 condition: 7 of them and filesize < 122880 }
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