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rule win_torrentlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.torrentlocker." 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.torrentlocker" 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 = { c3 83f801 7405 83f802 } // n = 4, score = 500 // c3 | ret // 83f801 | cmp eax, 1 // 7405 | je 7 // 83f802 | cmp eax, 2 $sequence_1 = { 8b0d???????? 5f c7000c000000 894804 } // n = 4, score = 400 // 8b0d???????? | // 5f | pop edi // c7000c000000 | mov dword ptr [eax], 0xc // 894804 | mov dword ptr [eax + 4], ecx $sequence_2 = { 85c0 7514 e8???????? 3d00000600 } // n = 4, score = 400 // 85c0 | test eax, eax // 7514 | jne 0x16 // e8???????? | // 3d00000600 | cmp eax, 0x60000 $sequence_3 = { 50 56 6a00 6a01 6a02 ff15???????? } // n = 6, score = 400 // 50 | push eax // 56 | push esi // 6a00 | push 0 // 6a01 | push 1 // 6a02 | push 2 // ff15???????? | $sequence_4 = { 8b0d???????? 890e e8???????? 8bd8 e8???????? 6a00 6a01 } // n = 7, score = 400 // 8b0d???????? | // 890e | mov dword ptr [esi], ecx // e8???????? | // 8bd8 | mov ebx, eax // e8???????? | // 6a00 | push 0 // 6a01 | push 1 $sequence_5 = { 83ec24 6a00 6a01 68???????? ff15???????? 85c0 7551 } // n = 7, score = 400 // 83ec24 | sub esp, 0x24 // 6a00 | push 0 // 6a01 | push 1 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7551 | jne 0x53 $sequence_6 = { 56 ff15???????? 83f802 740f 83f803 740a } // n = 6, score = 400 // 56 | push esi // ff15???????? | // 83f802 | cmp eax, 2 // 740f | je 0x11 // 83f803 | cmp eax, 3 // 740a | je 0xc $sequence_7 = { e8???????? 3d00000600 1bc0 40 a3???????? eb05 } // n = 6, score = 400 // e8???????? | // 3d00000600 | cmp eax, 0x60000 // 1bc0 | sbb eax, eax // 40 | inc eax // a3???????? | // eb05 | jmp 7 $sequence_8 = { 83c002 6685c9 75f5 2bc2 d1f8 8d440014 } // n = 6, score = 400 // 83c002 | add eax, 2 // 6685c9 | test cx, cx // 75f5 | jne 0xfffffff7 // 2bc2 | sub eax, edx // d1f8 | sar eax, 1 // 8d440014 | lea eax, [eax + eax + 0x14] $sequence_9 = { 52 50 ff15???????? 85c0 7519 8b0d???????? 51 } // n = 7, score = 400 // 52 | push edx // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7519 | jne 0x1b // 8b0d???????? | // 51 | push ecx $sequence_10 = { 51 6a01 6a00 0d00800000 50 6a00 } // n = 6, score = 400 // 51 | push ecx // 6a01 | push 1 // 6a00 | push 0 // 0d00800000 | or eax, 0x8000 // 50 | push eax // 6a00 | push 0 $sequence_11 = { 8b0d???????? 5f 894e0c 5e } // n = 4, score = 400 // 8b0d???????? | // 5f | pop edi // 894e0c | mov dword ptr [esi + 0xc], ecx // 5e | pop esi $sequence_12 = { 8b0d???????? 6a00 6a00 57 } // n = 4, score = 400 // 8b0d???????? | // 6a00 | push 0 // 6a00 | push 0 // 57 | push edi $sequence_13 = { 48 85c0 7ff4 5f 33c0 5e c3 } // n = 7, score = 400 // 48 | dec eax // 85c0 | test eax, eax // 7ff4 | jg 0xfffffff6 // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi // c3 | ret $sequence_14 = { 8b0d???????? 57 6a00 51 ff15???????? 8bc6 } // n = 6, score = 400 // 8b0d???????? | // 57 | push edi // 6a00 | push 0 // 51 | push ecx // ff15???????? | // 8bc6 | mov eax, esi $sequence_15 = { c705????????00000000 e8???????? 8bf0 e8???????? } // n = 4, score = 400 // c705????????00000000 | // e8???????? | // 8bf0 | mov esi, eax // e8???????? | condition: 7 of them and filesize < 933888 }
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