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rule win_terminator_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.terminator_rat." 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.terminator_rat" 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 = { 89b521010000 6a01 58 5e } // n = 4, score = 500 // 89b521010000 | mov dword ptr [ebp + 0x121], esi // 6a01 | push 1 // 58 | pop eax // 5e | pop esi $sequence_1 = { 8d4618 50 8b8539010000 03c1 } // n = 4, score = 500 // 8d4618 | lea eax, [esi + 0x18] // 50 | push eax // 8b8539010000 | mov eax, dword ptr [ebp + 0x139] // 03c1 | add eax, ecx $sequence_2 = { 89853d010000 33c0 e9???????? ff7610 8b8d35010000 } // n = 5, score = 500 // 89853d010000 | mov dword ptr [ebp + 0x13d], eax // 33c0 | xor eax, eax // e9???????? | // ff7610 | push dword ptr [esi + 0x10] // 8b8d35010000 | mov ecx, dword ptr [ebp + 0x135] $sequence_3 = { eb31 ff9509010000 3d4c270000 750e } // n = 4, score = 500 // eb31 | jmp 0x33 // ff9509010000 | call dword ptr [ebp + 0x109] // 3d4c270000 | cmp eax, 0x274c // 750e | jne 0x10 $sequence_4 = { 8bdc 56 57 8b7b08 8bf7 } // n = 5, score = 500 // 8bdc | mov ebx, esp // 56 | push esi // 57 | push edi // 8b7b08 | mov edi, dword ptr [ebx + 8] // 8bf7 | mov esi, edi $sequence_5 = { 6800040000 50 e8???????? 8b7708 8d460c } // n = 5, score = 500 // 6800040000 | push 0x400 // 50 | push eax // e8???????? | // 8b7708 | mov esi, dword ptr [edi + 8] // 8d460c | lea eax, [esi + 0xc] $sequence_6 = { ff5579 33db 85c0 0f84d1000000 } // n = 4, score = 500 // ff5579 | call dword ptr [ebp + 0x79] // 33db | xor ebx, ebx // 85c0 | test eax, eax // 0f84d1000000 | je 0xd7 $sequence_7 = { 50 8d8784fcffff 50 ff553d 8b851d010000 33d2 } // n = 6, score = 500 // 50 | push eax // 8d8784fcffff | lea eax, [edi - 0x37c] // 50 | push eax // ff553d | call dword ptr [ebp + 0x3d] // 8b851d010000 | mov eax, dword ptr [ebp + 0x11d] // 33d2 | xor edx, edx $sequence_8 = { 8bf0 8d8549020000 50 56 ff5565 85c0 7403 } // n = 7, score = 500 // 8bf0 | mov esi, eax // 8d8549020000 | lea eax, [ebp + 0x249] // 50 | push eax // 56 | push esi // ff5565 | call dword ptr [ebp + 0x65] // 85c0 | test eax, eax // 7403 | je 5 $sequence_9 = { 3452 c0c803 3441 c0c803 aa } // n = 5, score = 500 // 3452 | xor al, 0x52 // c0c803 | ror al, 3 // 3441 | xor al, 0x41 // c0c803 | ror al, 3 // aa | stosb byte ptr es:[edi], al condition: 7 of them and filesize < 73728 }
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