Actor(s): APT17
There is no description at this point.
rule win_highnote_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.highnote." 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.highnote" 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 = { b3a7 8cd7 a5 329ea1afa9a5 5d b5a5 } // n = 6, score = 200 // b3a7 | mov bl, 0xa7 // 8cd7 | mov edi, ss // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 329ea1afa9a5 | xor bl, byte ptr [esi - 0x5a56505f] // 5d | pop ebp // b5a5 | mov ch, 0xa5 $sequence_1 = { 2d620a682c fd 9d 8945ec 8945f0 8945f4 9c } // n = 7, score = 200 // 2d620a682c | sub eax, 0x2c680a62 // fd | std // 9d | popfd // 8945ec | mov dword ptr [ebp - 0x14], eax // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // 9c | pushfd $sequence_2 = { 3665017cf341 14b0 63c5 ef d550 3362db } // n = 6, score = 200 // 3665017cf341 | add dword ptr gs:[ebx + esi*8 + 0x41], edi // 14b0 | adc al, 0xb0 // 63c5 | arpl bp, ax // ef | out dx, eax // d550 | aad 0x50 // 3362db | xor esp, dword ptr [edx - 0x25] $sequence_3 = { 0fb6c9 8a1408 0fb6da 03de 81e3ff000080 } // n = 5, score = 200 // 0fb6c9 | movzx ecx, cl // 8a1408 | mov dl, byte ptr [eax + ecx] // 0fb6da | movzx ebx, dl // 03de | add ebx, esi // 81e3ff000080 | and ebx, 0x800000ff $sequence_4 = { 98 fd bfb47ea0c6 ddbb690cc1af 6595 fa 6a23 } // n = 7, score = 200 // 98 | cwde // fd | std // bfb47ea0c6 | mov edi, 0xc6a07eb4 // ddbb690cc1af | fnstsw dword ptr [ebx - 0x503ef397] // 6595 | xchg eax, ebp // fa | cli // 6a23 | push 0x23 $sequence_5 = { 115542 305421f0 d438 bd4dae2b31 b1f7 } // n = 5, score = 200 // 115542 | adc dword ptr [ebp + 0x42], edx // 305421f0 | xor byte ptr [ecx - 0x10], dl // d438 | aam 0x38 // bd4dae2b31 | mov ebp, 0x312bae4d // b1f7 | mov cl, 0xf7 $sequence_6 = { 90 9e a4 3634a1 6594 2424 e230 } // n = 7, score = 200 // 90 | nop // 9e | sahf // a4 | movsb byte ptr es:[edi], byte ptr [esi] // 3634a1 | xor al, 0xa1 // 6594 | xchg eax, esp // 2424 | and al, 0x24 // e230 | loop 0x32 $sequence_7 = { 2ca7 33e6 7479 1e 0477 ed 7cb1 } // n = 7, score = 200 // 2ca7 | sub al, 0xa7 // 33e6 | xor esp, esi // 7479 | je 0x7b // 1e | push ds // 0477 | add al, 0x77 // ed | in eax, dx // 7cb1 | jl 0xffffffb3 $sequence_8 = { 8636 35cfd6d703 b368 321e 4a 727d 51 } // n = 7, score = 200 // 8636 | xchg byte ptr [esi], dh // 35cfd6d703 | xor eax, 0x3d7d6cf // b368 | mov bl, 0x68 // 321e | xor bl, byte ptr [esi] // 4a | dec edx // 727d | jb 0x7f // 51 | push ecx $sequence_9 = { 000b 2920 da927a3741d4 7e5b a7 5a 40 } // n = 7, score = 200 // 000b | add byte ptr [ebx], cl // 2920 | sub dword ptr [eax], esp // da927a3741d4 | ficom dword ptr [edx - 0x2bbec886] // 7e5b | jle 0x5d // a7 | cmpsd dword ptr [esi], dword ptr es:[edi] // 5a | pop edx // 40 | inc eax condition: 7 of them and filesize < 321536 }
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