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rule win_terminator_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ffb519010000 8947fc 8b47f4 8b4008 894708 e8???????? 8b47fc } // n = 7, score = 500 // ffb519010000 | push dword ptr [ebp + 0x119] // 8947fc | mov dword ptr [edi - 4], eax // 8b47f4 | mov eax, dword ptr [edi - 0xc] // 8b4008 | mov eax, dword ptr [eax + 8] // 894708 | mov dword ptr [edi + 8], eax // e8???????? | // 8b47fc | mov eax, dword ptr [edi - 4] $sequence_1 = { c70020000000 8b852d010000 2b08 894804 } // n = 4, score = 500 // c70020000000 | mov dword ptr [eax], 0x20 // 8b852d010000 | mov eax, dword ptr [ebp + 0x12d] // 2b08 | sub ecx, dword ptr [eax] // 894804 | mov dword ptr [eax + 4], ecx $sequence_2 = { 33db 395e0c 752f 6a40 6800100000 6800180000 } // n = 6, score = 500 // 33db | xor ebx, ebx // 395e0c | cmp dword ptr [esi + 0xc], ebx // 752f | jne 0x31 // 6a40 | push 0x40 // 6800100000 | push 0x1000 // 6800180000 | push 0x1800 $sequence_3 = { 26a130000000 07 8b400c 8b701c } // n = 4, score = 500 // 26a130000000 | mov eax, dword ptr es:[0x30] // 07 | pop es // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b701c | mov esi, dword ptr [eax + 0x1c] $sequence_4 = { 50 ffb525010000 ff95e1000000 85c0 } // n = 4, score = 500 // 50 | push eax // ffb525010000 | push dword ptr [ebp + 0x125] // ff95e1000000 | call dword ptr [ebp + 0xe1] // 85c0 | test eax, eax $sequence_5 = { 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_6 = { 57 8bfc 81ec04040000 53 56 33db } // n = 6, score = 500 // 57 | push edi // 8bfc | mov edi, esp // 81ec04040000 | sub esp, 0x404 // 53 | push ebx // 56 | push esi // 33db | xor ebx, ebx $sequence_7 = { 8b4b0c ac 3459 c0c803 3448 c0c803 } // n = 6, score = 500 // 8b4b0c | mov ecx, dword ptr [ebx + 0xc] // ac | lodsb al, byte ptr [esi] // 3459 | xor al, 0x59 // c0c803 | ror al, 3 // 3448 | xor al, 0x48 // c0c803 | ror al, 3 $sequence_8 = { ffb519010000 8947fc 8b47f4 8b4008 } // n = 4, score = 500 // ffb519010000 | push dword ptr [ebp + 0x119] // 8947fc | mov dword ptr [edi - 4], eax // 8b47f4 | mov eax, dword ptr [edi - 0xc] // 8b4008 | mov eax, dword ptr [eax + 8] $sequence_9 = { 60 33c0 8b4f0c 8b7f08 } // n = 4, score = 500 // 60 | pushal // 33c0 | xor eax, eax // 8b4f0c | mov ecx, dword ptr [edi + 0xc] // 8b7f08 | mov edi, dword ptr [edi + 8] condition: 7 of them and filesize < 73728 }
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