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rule win_suncrypt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.suncrypt." 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.suncrypt" 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 = { 83f91d 72ec 8a4de2 8d855cffffff 8d55e2 84c9 7419 } // n = 7, score = 200 // 83f91d | cmp ecx, 0x1d // 72ec | jb 0xffffffee // 8a4de2 | mov cl, byte ptr [ebp - 0x1e] // 8d855cffffff | lea eax, [ebp - 0xa4] // 8d55e2 | lea edx, [ebp - 0x1e] // 84c9 | test cl, cl // 7419 | je 0x1b $sequence_1 = { 33c0 803d????????01 56 0f95c0 c745d000000000 6800040000 8945cc } // n = 7, score = 200 // 33c0 | xor eax, eax // 803d????????01 | // 56 | push esi // 0f95c0 | setne al // c745d000000000 | mov dword ptr [ebp - 0x30], 0 // 6800040000 | push 0x400 // 8945cc | mov dword ptr [ebp - 0x34], eax $sequence_2 = { 57 53 56 e8???????? 83c408 84c0 } // n = 6, score = 200 // 57 | push edi // 53 | push ebx // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // 84c0 | test al, al $sequence_3 = { 8b45e0 83f072 8845e4 8b45e0 fec0 83f065 8845e5 } // n = 7, score = 200 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 83f072 | xor eax, 0x72 // 8845e4 | mov byte ptr [ebp - 0x1c], al // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // fec0 | inc al // 83f065 | xor eax, 0x65 // 8845e5 | mov byte ptr [ebp - 0x1b], al $sequence_4 = { bf41000000 894dfc 8bd1 8a1a 8d5201 0fbe30 0fbecb } // n = 7, score = 200 // bf41000000 | mov edi, 0x41 // 894dfc | mov dword ptr [ebp - 4], ecx // 8bd1 | mov edx, ecx // 8a1a | mov bl, byte ptr [edx] // 8d5201 | lea edx, [edx + 1] // 0fbe30 | movsx esi, byte ptr [eax] // 0fbecb | movsx ecx, bl $sequence_5 = { 0410 83f075 8845d4 8b45c0 0411 } // n = 5, score = 200 // 0410 | add al, 0x10 // 83f075 | xor eax, 0x75 // 8845d4 | mov byte ptr [ebp - 0x2c], al // 8b45c0 | mov eax, dword ptr [ebp - 0x40] // 0411 | add al, 0x11 $sequence_6 = { 8d8518ffffff 0f108578ffffff 50 0f118538feffff 0f104588 0f118548feffff 0f104598 } // n = 7, score = 200 // 8d8518ffffff | lea eax, [ebp - 0xe8] // 0f108578ffffff | movups xmm0, xmmword ptr [ebp - 0x88] // 50 | push eax // 0f118538feffff | movups xmmword ptr [ebp - 0x1c8], xmm0 // 0f104588 | movups xmm0, xmmword ptr [ebp - 0x78] // 0f118548feffff | movups xmmword ptr [ebp - 0x1b8], xmm0 // 0f104598 | movups xmm0, xmmword ptr [ebp - 0x68] $sequence_7 = { 8b45dc 0419 83f077 8845f9 8b45dc 041a 83f043 } // n = 7, score = 200 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 0419 | add al, 0x19 // 83f077 | xor eax, 0x77 // 8845f9 | mov byte ptr [ebp - 7], al // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 041a | add al, 0x1a // 83f043 | xor eax, 0x43 $sequence_8 = { 3bf9 72f5 803800 753d 6a00 57 } // n = 6, score = 200 // 3bf9 | cmp edi, ecx // 72f5 | jb 0xfffffff7 // 803800 | cmp byte ptr [eax], 0 // 753d | jne 0x3f // 6a00 | push 0 // 57 | push edi $sequence_9 = { 8a0a 84c9 7410 2bd6 8a06 46 3ac1 } // n = 7, score = 200 // 8a0a | mov cl, byte ptr [edx] // 84c9 | test cl, cl // 7410 | je 0x12 // 2bd6 | sub edx, esi // 8a06 | mov al, byte ptr [esi] // 46 | inc esi // 3ac1 | cmp al, cl condition: 7 of them and filesize < 172032 }
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