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rule win_hi_zor_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.hi_zor_rat." 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.hi_zor_rat" 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 = { c644303080 8b4e24 83e13f 80f937 7614 8bc6 e8???????? } // n = 7, score = 200 // c644303080 | mov byte ptr [eax + esi + 0x30], 0x80 // 8b4e24 | mov ecx, dword ptr [esi + 0x24] // 83e13f | and ecx, 0x3f // 80f937 | cmp cl, 0x37 // 7614 | jbe 0x16 // 8bc6 | mov eax, esi // e8???????? | $sequence_1 = { ff15???????? 8b4d08 57 8bf0 51 56 } // n = 6, score = 200 // ff15???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 57 | push edi // 8bf0 | mov esi, eax // 51 | push ecx // 56 | push esi $sequence_2 = { e8???????? 8b1d???????? 83c418 6804010000 8d8df4fdffff 51 } // n = 6, score = 200 // e8???????? | // 8b1d???????? | // 83c418 | add esp, 0x18 // 6804010000 | push 0x104 // 8d8df4fdffff | lea ecx, [ebp - 0x20c] // 51 | push ecx $sequence_3 = { 23da 8bfa 8b5014 f7d7 } // n = 4, score = 200 // 23da | and ebx, edx // 8bfa | mov edi, edx // 8b5014 | mov edx, dword ptr [eax + 0x14] // f7d7 | not edi $sequence_4 = { 8b5818 8db41e604b0000 c1e610 c1ef10 0bfe } // n = 5, score = 200 // 8b5818 | mov ebx, dword ptr [eax + 0x18] // 8db41e604b0000 | lea esi, [esi + ebx + 0x4b60] // c1e610 | shl esi, 0x10 // c1ef10 | shr edi, 0x10 // 0bfe | or edi, esi $sequence_5 = { 037018 f7d2 8975f8 897014 8bfa 0b55f8 } // n = 6, score = 200 // 037018 | add esi, dword ptr [eax + 0x18] // f7d2 | not edx // 8975f8 | mov dword ptr [ebp - 8], esi // 897014 | mov dword ptr [eax + 0x14], esi // 8bfa | mov edi, edx // 0b55f8 | or edx, dword ptr [ebp - 8] $sequence_6 = { 57 51 50 8945f4 e8???????? 8b450c } // n = 6, score = 200 // 57 | push edi // 51 | push ecx // 50 | push eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // e8???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_7 = { 50 51 e8???????? 83c424 893e 5f 5e } // n = 7, score = 200 // 50 | push eax // 51 | push ecx // e8???????? | // 83c424 | add esp, 0x24 // 893e | mov dword ptr [esi], edi // 5f | pop edi // 5e | pop esi $sequence_8 = { ffd6 8b55ec 83c404 52 ffd6 83c404 } // n = 6, score = 200 // ffd6 | call esi // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 83c404 | add esp, 4 // 52 | push edx // ffd6 | call esi // 83c404 | add esp, 4 $sequence_9 = { 83c40c 6a00 8d450c 50 6800e00100 8d4608 50 } // n = 7, score = 200 // 83c40c | add esp, 0xc // 6a00 | push 0 // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 6800e00100 | push 0x1e000 // 8d4608 | lea eax, [esi + 8] // 50 | push eax condition: 7 of them and filesize < 73728 }
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