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rule win_suncrypt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 0f118538ffffff 0f104598 0f118548ffffff 0f1045a8 0f118558ffffff e8???????? 8d8568ffffff } // n = 7, score = 200 // 0f118538ffffff | movups xmmword ptr [ebp - 0xc8], xmm0 // 0f104598 | movups xmm0, xmmword ptr [ebp - 0x68] // 0f118548ffffff | movups xmmword ptr [ebp - 0xb8], xmm0 // 0f1045a8 | movups xmm0, xmmword ptr [ebp - 0x58] // 0f118558ffffff | movups xmmword ptr [ebp - 0xa8], xmm0 // e8???????? | // 8d8568ffffff | lea eax, [ebp - 0x98] $sequence_1 = { 8d8508ffffff c68511ffffff00 50 ff15???????? 8bd0 85d2 0f84a3000000 } // n = 7, score = 200 // 8d8508ffffff | lea eax, [ebp - 0xf8] // c68511ffffff00 | mov byte ptr [ebp - 0xef], 0 // 50 | push eax // ff15???????? | // 8bd0 | mov edx, eax // 85d2 | test edx, edx // 0f84a3000000 | je 0xa9 $sequence_2 = { 0f2985f0fdffff 660fefc1 0f28c8 660f72f007 660f72d119 660febc8 } // n = 6, score = 200 // 0f2985f0fdffff | movaps xmmword ptr [ebp - 0x210], xmm0 // 660fefc1 | pxor xmm0, xmm1 // 0f28c8 | movaps xmm1, xmm0 // 660f72f007 | pslld xmm0, 7 // 660f72d119 | psrld xmm1, 0x19 // 660febc8 | por xmm1, xmm0 $sequence_3 = { 8b8d64ffffff 02ca 0fbec0 33c8 888c1568ffffff 42 83fa09 } // n = 7, score = 200 // 8b8d64ffffff | mov ecx, dword ptr [ebp - 0x9c] // 02ca | add cl, dl // 0fbec0 | movsx eax, al // 33c8 | xor ecx, eax // 888c1568ffffff | mov byte ptr [ebp + edx - 0x98], cl // 42 | inc edx // 83fa09 | cmp edx, 9 $sequence_4 = { c745fc???????? e8???????? 8bf8 83c404 85ff 743f } // n = 6, score = 200 // c745fc???????? | // e8???????? | // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 85ff | test edi, edi // 743f | je 0x41 $sequence_5 = { ff15???????? 6a00 6a00 ff75f8 8bf0 8b4508 56 } // n = 7, score = 200 // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // ff75f8 | push dword ptr [ebp - 8] // 8bf0 | mov esi, eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 56 | push esi $sequence_6 = { 8b45fc ebdb 57 6a00 ff15???????? 50 } // n = 6, score = 200 // 8b45fc | mov eax, dword ptr [ebp - 4] // ebdb | jmp 0xffffffdd // 57 | push edi // 6a00 | push 0 // ff15???????? | // 50 | push eax $sequence_7 = { 8945f8 8d85dcfcffff 8945e4 8b4514 0f1000 0f11853cffffff 0f104010 } // n = 7, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 8d85dcfcffff | lea eax, [ebp - 0x324] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 0f1000 | movups xmm0, xmmword ptr [eax] // 0f11853cffffff | movups xmmword ptr [ebp - 0xc4], xmm0 // 0f104010 | movups xmm0, xmmword ptr [eax + 0x10] $sequence_8 = { 8955f8 894dc8 8b4df4 660f1f440000 83f840 7321 } // n = 6, score = 200 // 8955f8 | mov dword ptr [ebp - 8], edx // 894dc8 | mov dword ptr [ebp - 0x38], ecx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 660f1f440000 | nop word ptr [eax + eax] // 83f840 | cmp eax, 0x40 // 7321 | jae 0x23 $sequence_9 = { 8845e8 8b45c0 0425 83f072 8845e9 8b45c0 0426 } // n = 7, score = 200 // 8845e8 | mov byte ptr [ebp - 0x18], al // 8b45c0 | mov eax, dword ptr [ebp - 0x40] // 0425 | add al, 0x25 // 83f072 | xor eax, 0x72 // 8845e9 | mov byte ptr [ebp - 0x17], al // 8b45c0 | mov eax, dword ptr [ebp - 0x40] // 0426 | add al, 0x26 condition: 7 of them and filesize < 172032 }
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