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rule win_taintedscribe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.taintedscribe." 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.taintedscribe" 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 = { 895664 884660 894658 894670 894654 894e68 89466c } // n = 7, score = 500 // 895664 | mov dword ptr [esi + 0x64], edx // 884660 | mov byte ptr [esi + 0x60], al // 894658 | mov dword ptr [esi + 0x58], eax // 894670 | mov dword ptr [esi + 0x70], eax // 894654 | mov dword ptr [esi + 0x54], eax // 894e68 | mov dword ptr [esi + 0x68], ecx // 89466c | mov dword ptr [esi + 0x6c], eax $sequence_1 = { 8b4ddc 50 51 e8???????? 8bca } // n = 5, score = 500 // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 50 | push eax // 51 | push ecx // e8???????? | // 8bca | mov ecx, edx $sequence_2 = { 3bfe 750e 8bcb e8???????? } // n = 4, score = 500 // 3bfe | cmp edi, esi // 750e | jne 0x10 // 8bcb | mov ecx, ebx // e8???????? | $sequence_3 = { 33c0 8995acfbffff 0fb65338 8855ed 668985a0fbffff 898da8fbffff } // n = 6, score = 500 // 33c0 | xor eax, eax // 8995acfbffff | mov dword ptr [ebp - 0x454], edx // 0fb65338 | movzx edx, byte ptr [ebx + 0x38] // 8855ed | mov byte ptr [ebp - 0x13], dl // 668985a0fbffff | mov word ptr [ebp - 0x460], ax // 898da8fbffff | mov dword ptr [ebp - 0x458], ecx $sequence_4 = { 8d4da8 51 ff15???????? 8d55b8 } // n = 4, score = 500 // 8d4da8 | lea ecx, [ebp - 0x58] // 51 | push ecx // ff15???????? | // 8d55b8 | lea edx, [ebp - 0x48] $sequence_5 = { 50 56 ffd7 6a00 8d5594 } // n = 5, score = 500 // 50 | push eax // 56 | push esi // ffd7 | call edi // 6a00 | push 0 // 8d5594 | lea edx, [ebp - 0x6c] $sequence_6 = { 56 e8???????? 8894373c1b0000 8d8eb41e0000 83c40c } // n = 5, score = 500 // 56 | push esi // e8???????? | // 8894373c1b0000 | mov byte ptr [edi + esi + 0x1b3c], dl // 8d8eb41e0000 | lea ecx, [esi + 0x1eb4] // 83c40c | add esp, 0xc $sequence_7 = { 8b5d10 83c404 837d1400 0f84a3000000 } // n = 4, score = 500 // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 83c404 | add esp, 4 // 837d1400 | cmp dword ptr [ebp + 0x14], 0 // 0f84a3000000 | je 0xa9 $sequence_8 = { 8b550c 83c40c 8b8e68af0100 8b07 } // n = 4, score = 500 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 83c40c | add esp, 0xc // 8b8e68af0100 | mov ecx, dword ptr [esi + 0x1af68] // 8b07 | mov eax, dword ptr [edi] $sequence_9 = { 7407 3d50450000 7507 814da400004000 8b7da4 8b5d9c 8b4580 } // n = 7, score = 500 // 7407 | je 9 // 3d50450000 | cmp eax, 0x4550 // 7507 | jne 9 // 814da400004000 | or dword ptr [ebp - 0x5c], 0x400000 // 8b7da4 | mov edi, dword ptr [ebp - 0x5c] // 8b5d9c | mov ebx, dword ptr [ebp - 0x64] // 8b4580 | mov eax, dword ptr [ebp - 0x80] condition: 7 of them and filesize < 524288 }
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