Actor(s): DragonOK
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rule win_khrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.khrat." 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.khrat" 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 = { c745f006000000 c745f8???????? 8d45d0 50 e8???????? 6a00 } // n = 6, score = 100 // c745f006000000 | mov dword ptr [ebp - 0x10], 6 // c745f8???????? | // 8d45d0 | lea eax, dword ptr [ebp - 0x30] // 50 | push eax // e8???????? | // 6a00 | push 0 $sequence_1 = { a3???????? 6a00 6800003000 6a00 6a04 } // n = 5, score = 100 // a3???????? | // 6a00 | push 0 // 6800003000 | push 0x300000 // 6a00 | push 0 // 6a04 | push 4 $sequence_2 = { 8d7e0b eb37 6a01 ff75a0 e8???????? 3d02010000 } // n = 6, score = 100 // 8d7e0b | lea edi, dword ptr [esi + 0xb] // eb37 | jmp 0x39 // 6a01 | push 1 // ff75a0 | push dword ptr [ebp - 0x60] // e8???????? | // 3d02010000 | cmp eax, 0x102 $sequence_3 = { 8d8548feffff 50 6806100000 68ffff0000 ff35???????? e8???????? } // n = 6, score = 100 // 8d8548feffff | lea eax, dword ptr [ebp - 0x1b8] // 50 | push eax // 6806100000 | push 0x1006 // 68ffff0000 | push 0xffff // ff35???????? | // e8???????? | $sequence_4 = { ff35???????? 8f45e4 c745d030000000 c745d8fa320010 c745f006000000 c745f8???????? 8d45d0 } // n = 7, score = 100 // ff35???????? | // 8f45e4 | pop dword ptr [ebp - 0x1c] // c745d030000000 | mov dword ptr [ebp - 0x30], 0x30 // c745d8fa320010 | mov dword ptr [ebp - 0x28], 0x100032fa // c745f006000000 | mov dword ptr [ebp - 0x10], 6 // c745f8???????? | // 8d45d0 | lea eax, dword ptr [ebp - 0x30] $sequence_5 = { 8d45e0 50 68???????? e8???????? c705????????01000000 eb1b } // n = 6, score = 100 // 8d45e0 | lea eax, dword ptr [ebp - 0x20] // 50 | push eax // 68???????? | // e8???????? | // c705????????01000000 | // eb1b | jmp 0x1d $sequence_6 = { ffb5b8fbffff e8???????? ffb5bcfbffff 6a00 e8???????? c60300 c64301c4 } // n = 7, score = 100 // ffb5b8fbffff | push dword ptr [ebp - 0x448] // e8???????? | // ffb5bcfbffff | push dword ptr [ebp - 0x444] // 6a00 | push 0 // e8???????? | // c60300 | mov byte ptr [ebx], 0 // c64301c4 | mov byte ptr [ebx + 1], 0xc4 $sequence_7 = { 83f8ff 7502 eb24 81ad94fbfffff5030000 ff8590fbffff 6a01 } // n = 6, score = 100 // 83f8ff | cmp eax, -1 // 7502 | jne 4 // eb24 | jmp 0x26 // 81ad94fbfffff5030000 | sub dword ptr [ebp - 0x46c], 0x3f5 // ff8590fbffff | inc dword ptr [ebp - 0x470] // 6a01 | push 1 $sequence_8 = { 8d8500fdffff 50 e8???????? 8d8500feffff 50 } // n = 5, score = 100 // 8d8500fdffff | lea eax, dword ptr [ebp - 0x300] // 50 | push eax // e8???????? | // 8d8500feffff | lea eax, dword ptr [ebp - 0x200] // 50 | push eax $sequence_9 = { c60300 c64301c4 66c743020b00 c6430402 c6430500 } // n = 5, score = 100 // c60300 | mov byte ptr [ebx], 0 // c64301c4 | mov byte ptr [ebx + 1], 0xc4 // 66c743020b00 | mov word ptr [ebx + 2], 0xb // c6430402 | mov byte ptr [ebx + 4], 2 // c6430500 | mov byte ptr [ebx + 5], 0 condition: 7 of them and filesize < 57344 }
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