Actor(s): DragonOK
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rule win_sysget_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.sysget." 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.sysget" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { a5 50 8d85dcf9ffff 50 a5 } // n = 5, score = 400 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 50 | push eax // 8d85dcf9ffff | lea eax, dword ptr [ebp - 0x624] // 50 | push eax // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_1 = { e8???????? 68f9000000 8d8501ffffff 53 50 } // n = 5, score = 400 // e8???????? | // 68f9000000 | push 0xf9 // 8d8501ffffff | lea eax, dword ptr [ebp - 0xff] // 53 | push ebx // 50 | push eax $sequence_2 = { 50 668985fcf7ffff 8d85fef7ffff 50 e8???????? 6a00 } // n = 6, score = 400 // 50 | push eax // 668985fcf7ffff | mov word ptr [ebp - 0x804], ax // 8d85fef7ffff | lea eax, dword ptr [ebp - 0x802] // 50 | push eax // e8???????? | // 6a00 | push 0 $sequence_3 = { ff7508 893e ff15???????? 8bd8 83fbff } // n = 5, score = 400 // ff7508 | push dword ptr [ebp + 8] // 893e | mov dword ptr [esi], edi // ff15???????? | // 8bd8 | mov ebx, eax // 83fbff | cmp ebx, -1 $sequence_4 = { 8bd2 8bc9 50 58 90 90 } // n = 6, score = 400 // 8bd2 | mov edx, edx // 8bc9 | mov ecx, ecx // 50 | push eax // 58 | pop eax // 90 | nop // 90 | nop $sequence_5 = { 56 57 6a00 8bd8 ff15???????? 56 } // n = 6, score = 400 // 56 | push esi // 57 | push edi // 6a00 | push 0 // 8bd8 | mov ebx, eax // ff15???????? | // 56 | push esi $sequence_6 = { c745f0979394d4 c745f4c8c6c799 c745f8c9c8a0a0 e8???????? } // n = 4, score = 400 // c745f0979394d4 | mov dword ptr [ebp - 0x10], 0xd4949397 // c745f4c8c6c799 | mov dword ptr [ebp - 0xc], 0x99c7c6c8 // c745f8c9c8a0a0 | mov dword ptr [ebp - 8], 0xa0a0c8c9 // e8???????? | $sequence_7 = { 89b5e8f1ffff 8bb5e8f1ffff 68???????? 56 e8???????? 59 59 } // n = 7, score = 400 // 89b5e8f1ffff | mov dword ptr [ebp - 0xe18], esi // 8bb5e8f1ffff | mov esi, dword ptr [ebp - 0xe18] // 68???????? | // 56 | push esi // e8???????? | // 59 | pop ecx // 59 | pop ecx $sequence_8 = { a5 a5 a5 6a30 } // n = 4, score = 400 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 6a30 | push 0x30 $sequence_9 = { 8d85f8fbffff 50 ff35???????? ff15???????? 85c0 0f851dffffff } // n = 6, score = 400 // 8d85f8fbffff | lea eax, dword ptr [ebp - 0x408] // 50 | push eax // ff35???????? | // ff15???????? | // 85c0 | test eax, eax // 0f851dffffff | jne 0xffffff23 condition: 7 of them and filesize < 352256 }
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