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rule win_suncrypt_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 40 83f801 72f4 b001 5e 5d c3 } // n = 7, score = 200 // 40 | inc eax // 83f801 | cmp eax, 1 // 72f4 | jb 0xfffffff6 // b001 | mov al, 1 // 5e | pop esi // 5d | pop ebp // c3 | ret $sequence_1 = { 8345e810 0f28d4 8945f8 0f110f 8b7dfc 0f288d10feffff 660ffe8d00ffffff } // n = 7, score = 200 // 8345e810 | add dword ptr [ebp - 0x18], 0x10 // 0f28d4 | movaps xmm2, xmm4 // 8945f8 | mov dword ptr [ebp - 8], eax // 0f110f | movups xmmword ptr [edi], xmm1 // 8b7dfc | mov edi, dword ptr [ebp - 4] // 0f288d10feffff | movaps xmm1, xmmword ptr [ebp - 0x1f0] // 660ffe8d00ffffff | paddd xmm1, xmmword ptr [ebp - 0x100] $sequence_2 = { 85c9 741f 50 57 51 e8???????? 83c40c } // n = 7, score = 200 // 85c9 | test ecx, ecx // 741f | je 0x21 // 50 | push eax // 57 | push edi // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc $sequence_3 = { 8b4580 0345cc 898d58ffffff 8b4dd0 33c8 8b55f8 c1c110 } // n = 7, score = 200 // 8b4580 | mov eax, dword ptr [ebp - 0x80] // 0345cc | add eax, dword ptr [ebp - 0x34] // 898d58ffffff | mov dword ptr [ebp - 0xa8], ecx // 8b4dd0 | mov ecx, dword ptr [ebp - 0x30] // 33c8 | xor ecx, eax // 8b55f8 | mov edx, dword ptr [ebp - 8] // c1c110 | rol ecx, 0x10 $sequence_4 = { ff750c ff7508 e8???????? 83c40c 5d c3 a804 } // n = 7, score = 200 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 83c40c | add esp, 0xc // 5d | pop ebp // c3 | ret // a804 | test al, 4 $sequence_5 = { 56 ffd7 6808020000 6a00 68???????? a3???????? e8???????? } // n = 7, score = 200 // 56 | push esi // ffd7 | call edi // 6808020000 | push 0x208 // 6a00 | push 0 // 68???????? | // a3???????? | // e8???????? | $sequence_6 = { 8945b0 8b45fc 038534ffffff 33f8 c1c710 03cf 8bd1 } // n = 7, score = 200 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 038534ffffff | add eax, dword ptr [ebp - 0xcc] // 33f8 | xor edi, eax // c1c710 | rol edi, 0x10 // 03cf | add ecx, edi // 8bd1 | mov edx, ecx $sequence_7 = { 8845e1 8b45dc 0402 83f06c 8845e2 8b45dc 0403 } // n = 7, score = 200 // 8845e1 | mov byte ptr [ebp - 0x1f], al // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 0402 | add al, 2 // 83f06c | xor eax, 0x6c // 8845e2 | mov byte ptr [ebp - 0x1e], al // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 0403 | add al, 3 $sequence_8 = { 83c601 742c 8b0f 85c9 7426 8b470c 8d1430 } // n = 7, score = 200 // 83c601 | add esi, 1 // 742c | je 0x2e // 8b0f | mov ecx, dword ptr [edi] // 85c9 | test ecx, ecx // 7426 | je 0x28 // 8b470c | mov eax, dword ptr [edi + 0xc] // 8d1430 | lea edx, [eax + esi] $sequence_9 = { 8b1d???????? 56 57 c745fc00000000 c745f800000000 c745f400000000 } // n = 6, score = 200 // 8b1d???????? | // 56 | push esi // 57 | push edi // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745f800000000 | mov dword ptr [ebp - 8], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 condition: 7 of them and filesize < 172032 }
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