Actor(s): Axiom
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rule win_highnote_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { b3f1 d7 ee 2f 68351fad87 9d 85c0 } // n = 7, score = 200 // b3f1 | mov bl, 0xf1 // d7 | xlatb // ee | out dx, al // 2f | das // 68351fad87 | push 0x87ad1f35 // 9d | popfd // 85c0 | test eax, eax $sequence_1 = { f61f 6669ceab5c 15c3a595c2 0e c87b3119 ec 32b8215f5c32 } // n = 7, score = 200 // f61f | neg byte ptr [edi] // 6669ceab5c | imul cx, si, 0x5cab // 15c3a595c2 | adc eax, 0xc295a5c3 // 0e | push cs // c87b3119 | enter 0x317b, 0x19 // ec | in al, dx // 32b8215f5c32 | xor bh, byte ptr [eax + 0x325c5f21] $sequence_2 = { 1353db 43 672832 54 45 c14cf35e41 ee } // n = 7, score = 200 // 1353db | adc edx, dword ptr [ebx - 0x25] // 43 | inc ebx // 672832 | sub byte ptr [bp + si], dh // 54 | push esp // 45 | inc ebp // c14cf35e41 | ror dword ptr [ebx + esi*8 + 0x5e], 0x41 // ee | out dx, al $sequence_3 = { 29d4 ad 2ac2 94 15042afd06 d15ae3 54 } // n = 7, score = 200 // 29d4 | sub esp, edx // ad | lodsd eax, dword ptr [esi] // 2ac2 | sub al, dl // 94 | xchg eax, esp // 15042afd06 | adc eax, 0x6fd2a04 // d15ae3 | rcr dword ptr [edx - 0x1d], 1 // 54 | push esp $sequence_4 = { 1b673a 40 6b7eae7b bb892ef3a2 0c5f d4bf } // n = 6, score = 200 // 1b673a | sbb esp, dword ptr [edi + 0x3a] // 40 | inc eax // 6b7eae7b | imul edi, dword ptr [esi - 0x52], 0x7b // bb892ef3a2 | mov ebx, 0xa2f32e89 // 0c5f | or al, 0x5f // d4bf | aam 0xbf $sequence_5 = { 320c7e 47 8405???????? 59 296057 bf07e8a946 ddb61d4f1c2f } // n = 7, score = 200 // 320c7e | xor cl, byte ptr [esi + edi*2] // 47 | inc edi // 8405???????? | // 59 | pop ecx // 296057 | sub dword ptr [eax + 0x57], esp // bf07e8a946 | mov edi, 0x46a9e807 // ddb61d4f1c2f | fnsave dword ptr [esi + 0x2f1c4f1d] $sequence_6 = { 366e 7f74 294840 b616 d924f1 8e13 } // n = 6, score = 200 // 366e | outsb dx, byte ptr ss:[esi] // 7f74 | jg 0x76 // 294840 | sub dword ptr [eax + 0x40], ecx // b616 | mov dh, 0x16 // d924f1 | fldenv [ecx + esi*8] // 8e13 | mov ss, word ptr [ebx] $sequence_7 = { 17 5d 6f 638c740bbbf8b8 0a85aa638bfe aa 770d } // n = 7, score = 200 // 17 | pop ss // 5d | pop ebp // 6f | outsd dx, dword ptr [esi] // 638c740bbbf8b8 | arpl word ptr [esp + esi*2 - 0x470744f5], cx // 0a85aa638bfe | or al, byte ptr [ebp - 0x1749c56] // aa | stosb byte ptr es:[edi], al // 770d | ja 0xf $sequence_8 = { 98 55 b4f9 ad c9 a0???????? a5 } // n = 7, score = 200 // 98 | cwde // 55 | push ebp // b4f9 | mov ah, 0xf9 // ad | lodsd eax, dword ptr [esi] // c9 | leave // a0???????? | // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_9 = { ab 85c0 0c9a 98 b531 df37 f1 } // n = 7, score = 200 // ab | stosd dword ptr es:[edi], eax // 85c0 | test eax, eax // 0c9a | or al, 0x9a // 98 | cwde // b531 | mov ch, 0x31 // df37 | fbstp tbyte ptr [edi] // f1 | int1 condition: 7 of them and filesize < 321536 }
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