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rule win_taleret_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.taleret." 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.taleret" 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 = { 40 89442430 8b442428 c6450000 50 e8???????? 8b4c243c } // n = 7, score = 100 // 40 | inc eax // 89442430 | mov dword ptr [esp + 0x30], eax // 8b442428 | mov eax, dword ptr [esp + 0x28] // c6450000 | mov byte ptr [ebp], 0 // 50 | push eax // e8???????? | // 8b4c243c | mov ecx, dword ptr [esp + 0x3c] $sequence_1 = { 56 6a03 6a00 68???????? 51 } // n = 5, score = 100 // 56 | push esi // 6a03 | push 3 // 6a00 | push 0 // 68???????? | // 51 | push ecx $sequence_2 = { 2bf9 8d942458020000 8bf7 8bd9 8bfa 83c9ff f2ae } // n = 7, score = 100 // 2bf9 | sub edi, ecx // 8d942458020000 | lea edx, [esp + 0x258] // 8bf7 | mov esi, edi // 8bd9 | mov ebx, ecx // 8bfa | mov edi, edx // 83c9ff | or ecx, 0xffffffff // f2ae | repne scasb al, byte ptr es:[edi] $sequence_3 = { 8b542418 8d4c2450 6a04 51 } // n = 4, score = 100 // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8d4c2450 | lea ecx, [esp + 0x50] // 6a04 | push 4 // 51 | push ecx $sequence_4 = { 85c0 0f84f0050000 8d542448 33ed } // n = 4, score = 100 // 85c0 | test eax, eax // 0f84f0050000 | je 0x5f6 // 8d542448 | lea edx, [esp + 0x48] // 33ed | xor ebp, ebp $sequence_5 = { 0bce 7c0e 83f940 7d09 8a8c0ccc000000 } // n = 5, score = 100 // 0bce | or ecx, esi // 7c0e | jl 0x10 // 83f940 | cmp ecx, 0x40 // 7d09 | jge 0xb // 8a8c0ccc000000 | mov cl, byte ptr [esp + ecx + 0xcc] $sequence_6 = { 8b942428100000 50 52 68???????? 57 e8???????? 83c410 } // n = 7, score = 100 // 8b942428100000 | mov edx, dword ptr [esp + 0x1028] // 50 | push eax // 52 | push edx // 68???????? | // 57 | push edi // e8???????? | // 83c410 | add esp, 0x10 $sequence_7 = { e8???????? 8d4c2428 c7442420ffffffff e8???????? 33c0 8b4c2418 } // n = 6, score = 100 // e8???????? | // 8d4c2428 | lea ecx, [esp + 0x28] // c7442420ffffffff | mov dword ptr [esp + 0x20], 0xffffffff // e8???????? | // 33c0 | xor eax, eax // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] $sequence_8 = { e8???????? e9???????? 8d4c2410 c7842430100000ffffffff e8???????? } // n = 5, score = 100 // e8???????? | // e9???????? | // 8d4c2410 | lea ecx, [esp + 0x10] // c7842430100000ffffffff | mov dword ptr [esp + 0x1030], 0xffffffff // e8???????? | $sequence_9 = { 7439 8d4c242c 8d542418 51 52 ff15???????? } // n = 6, score = 100 // 7439 | je 0x3b // 8d4c242c | lea ecx, [esp + 0x2c] // 8d542418 | lea edx, [esp + 0x18] // 51 | push ecx // 52 | push edx // ff15???????? | condition: 7 of them and filesize < 73728 }
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