Actor(s): APT37
There is no description at this point.
rule win_final1stspy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.final1stspy." 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.final1stspy" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 6690 3acd 7412 8a4801 } // n = 4, score = 300 // 6690 | nop // 3acd | cmp cl, ch // 7412 | je 0x14 // 8a4801 | mov cl, byte ptr [eax + 1] $sequence_1 = { 7410 8a11 8acb 3aca 7425 8a4801 } // n = 6, score = 300 // 7410 | je 0x12 // 8a11 | mov dl, byte ptr [ecx] // 8acb | mov cl, bl // 3aca | cmp cl, dl // 7425 | je 0x27 // 8a4801 | mov cl, byte ptr [eax + 1] $sequence_2 = { 81cf00feffff 47 33f6 85ff 7e0a e8???????? 46 } // n = 7, score = 300 // 81cf00feffff | or edi, 0xfffffe00 // 47 | inc edi // 33f6 | xor esi, esi // 85ff | test edi, edi // 7e0a | jle 0xc // e8???????? | // 46 | inc esi $sequence_3 = { 7519 b8???????? 84db 7410 } // n = 4, score = 300 // 7519 | jne 0x1b // b8???????? | // 84db | test bl, bl // 7410 | je 0x12 $sequence_4 = { 8a4801 40 84c9 75f4 8b45f8 2bf0 56 } // n = 7, score = 300 // 8a4801 | mov cl, byte ptr [eax + 1] // 40 | inc eax // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 2bf0 | sub esi, eax // 56 | push esi $sequence_5 = { 8bd6 0f281d???????? 2bd0 0f10040f } // n = 4, score = 300 // 8bd6 | mov edx, esi // 0f281d???????? | // 2bd0 | sub edx, eax // 0f10040f | movups xmm0, xmmword ptr [edi + ecx] $sequence_6 = { 46 3bf7 7cf6 8b3d???????? 66660f1f840000000000 be00080000 } // n = 6, score = 300 // 46 | inc esi // 3bf7 | cmp esi, edi // 7cf6 | jl 0xfffffff8 // 8b3d???????? | // 66660f1f840000000000 | nop word ptr [eax + eax] // be00080000 | mov esi, 0x800 $sequence_7 = { 8a1d???????? 33ff 90 85ff 7519 b8???????? 84db } // n = 7, score = 300 // 8a1d???????? | // 33ff | xor edi, edi // 90 | nop // 85ff | test edi, edi // 7519 | jne 0x1b // b8???????? | // 84db | test bl, bl $sequence_8 = { 83ec0c 53 8bc1 8955f4 56 8bf0 8945fc } // n = 7, score = 300 // 83ec0c | sub esp, 0xc // 53 | push ebx // 8bc1 | mov eax, ecx // 8955f4 | mov dword ptr [ebp - 0xc], edx // 56 | push esi // 8bf0 | mov esi, eax // 8945fc | mov dword ptr [ebp - 4], eax $sequence_9 = { 7507 bf01000000 eb2b b8???????? 8acb } // n = 5, score = 300 // 7507 | jne 9 // bf01000000 | mov edi, 1 // eb2b | jmp 0x2d // b8???????? | // 8acb | mov cl, bl condition: 7 of them and filesize < 557056 }
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