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rule win_nightsky_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.nightsky." 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.nightsky" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 75b6 420fb6442420 eb02 b0ff 4188442f08 48ffc5 } // n = 6, score = 100 // 75b6 | movzx eax, byte ptr [esp + 0x1a0] // 420fb6442420 | inc ebp // eb02 | mov edx, dword ptr [esi] // b0ff | inc ecx // 4188442f08 | dec edx // 48ffc5 | inc ebp $sequence_1 = { e9???????? 0f85b7ffffff 4863d7 4533c0 c6c5bf 490fbfcb } // n = 6, score = 100 // e9???????? | // 0f85b7ffffff | cmp eax, 8 // 4863d7 | jb 0x11f // 4533c0 | dec eax // c6c5bf | mov ebx, dword ptr [ebx + 8] // 490fbfcb | jmp 0x123 $sequence_2 = { 48c787a000000003000000 48894760 488d05d2910200 c7475001000000 48c7475803000000 48894778 488d05a8530300 } // n = 7, score = 100 // 48c787a000000003000000 | dec eax // 48894760 | lea edx, [0xfffca1db] // 488d05d2910200 | inc esp // c7475001000000 | mov dword ptr [esp + 0x40], esp // 48c7475803000000 | mov al, 1 // 48894778 | test al, al // 488d05a8530300 | je 0x1de $sequence_3 = { 413394be10690500 0fb6c3 458bc1 448bde 41339486107d0500 413317 4983c704 } // n = 7, score = 100 // 413394be10690500 | je 0x68d // 0fb6c3 | dec eax // 458bc1 | lea ebx, [0x39d92] // 448bde | dec eax // 41339486107d0500 | mov ecx, ebx // 413317 | je 0x6b8 // 4983c704 | dec eax $sequence_4 = { 48c7432007000000 48896b18 6689746b08 eb1c 4885ff 7517 48897318 } // n = 7, score = 100 // 48c7432007000000 | dec eax // 48896b18 | lea ecx, [esp + 0x68] // 6689746b08 | nop // eb1c | dec eax // 4885ff | lea eax, [0xde39] // 7517 | dec eax // 48897318 | mov dword ptr [edi], eax $sequence_5 = { 4533848ea0710400 418bc9 48c1e908 4183e13f 83e13f 4533848e30690400 418bca } // n = 7, score = 100 // 4533848ea0710400 | mov edi, 1 // 418bc9 | dec eax // 48c1e908 | mul edi // 4183e13f | dec ecx // 83e13f | mov edi, 0xffffffff // 4533848e30690400 | dec ecx // 418bca | cmovo eax, edi $sequence_6 = { 488b4b08 668901 488bc3 488b5c2430 488b742438 4883c420 5f } // n = 7, score = 100 // 488b4b08 | inc esp // 668901 | btr edx, edi // 488bc3 | inc ebp // 488b5c2430 | xadd al, al // 488b742438 | cwd // 4883c420 | dec eax // 5f | mov edx, dword ptr [esp + 8] $sequence_7 = { 8b7808 e9???????? 488d058a0d0200 4a8b0ce8 42f644313880 744d 0fbecb } // n = 7, score = 100 // 8b7808 | inc ebx // e9???????? | // 488d058a0d0200 | inc eax // 4a8b0ce8 | mov bh, byte ptr [ebp + 1] // 42f644313880 | dec eax // 744d | inc ebp // 0fbecb | inc eax $sequence_8 = { 4585c0 e9???????? 0f84b0ffffff 448b8c088c000000 6699 f5 } // n = 6, score = 100 // 4585c0 | rcl ch, 0x95 // e9???????? | // 0f84b0ffffff | test cl, dh // 448b8c088c000000 | stc // 6699 | sub eax, 0x47082e91 // f5 | clc $sequence_9 = { c7475001000000 48c7475806000000 48894778 488d05c2560300 } // n = 4, score = 100 // c7475001000000 | dec ecx // 48c7475806000000 | sub ebx, 4 // 48894778 | shr cx, 0x80 // 488d05c2560300 | and cx, di condition: 7 of them and filesize < 19536896 }
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