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rule win_torrentlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 6a01 6a00 0d00800000 50 6a00 } // n = 5, score = 400 // 6a01 | push 1 // 6a00 | push 0 // 0d00800000 | or eax, 0x8000 // 50 | push eax // 6a00 | push 0 $sequence_2 = { 75f5 2bc2 d1f8 8d4c0010 } // n = 4, score = 400 // 75f5 | jne 0xfffffff7 // 2bc2 | sub eax, edx // d1f8 | sar eax, 1 // 8d4c0010 | lea ecx, [eax + eax + 0x10] $sequence_3 = { 750b 68???????? ff15???????? 8bc3 } // n = 4, score = 400 // 750b | jne 0xd // 68???????? | // ff15???????? | // 8bc3 | mov eax, ebx $sequence_4 = { 7415 50 a1???????? 56 50 } // n = 5, score = 400 // 7415 | je 0x17 // 50 | push eax // a1???????? | // 56 | push esi // 50 | push eax $sequence_5 = { 6a01 68???????? ff15???????? 85c0 7522 68???????? ff15???????? } // n = 7, score = 400 // 6a01 | push 1 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7522 | jne 0x24 // 68???????? | // ff15???????? | $sequence_6 = { 740a 48 85c0 7ff4 5f 33c0 } // n = 6, score = 400 // 740a | je 0xc // 48 | dec eax // 85c0 | test eax, eax // 7ff4 | jg 0xfffffff6 // 5f | pop edi // 33c0 | xor eax, eax $sequence_7 = { 7522 68???????? ff15???????? 85c0 7413 68???????? 50 } // n = 7, score = 400 // 7522 | jne 0x24 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7413 | je 0x15 // 68???????? | // 50 | push eax $sequence_8 = { c3 bf03000000 8bc7 5f 5e } // n = 5, score = 400 // c3 | ret // bf03000000 | mov edi, 3 // 8bc7 | mov eax, edi // 5f | pop edi // 5e | pop esi $sequence_9 = { 85c0 744f 56 b9???????? 8bf0 } // n = 5, score = 400 // 85c0 | test eax, eax // 744f | je 0x51 // 56 | push esi // b9???????? | // 8bf0 | mov esi, eax $sequence_10 = { bb???????? e8???????? 83c404 85c0 7412 } // n = 5, score = 400 // bb???????? | // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7412 | je 0x14 $sequence_11 = { 6890000000 6a00 68???????? e8???????? } // n = 4, score = 400 // 6890000000 | push 0x90 // 6a00 | push 0 // 68???????? | // e8???????? | $sequence_12 = { be06000000 8bc6 5e 5f c3 be04000000 8bc6 } // n = 7, score = 400 // be06000000 | mov esi, 6 // 8bc6 | mov eax, esi // 5e | pop esi // 5f | pop edi // c3 | ret // be04000000 | mov esi, 4 // 8bc6 | mov eax, esi $sequence_13 = { 75ef 03fb b8???????? 8d143f 2bd0 } // n = 5, score = 400 // 75ef | jne 0xfffffff1 // 03fb | add edi, ebx // b8???????? | // 8d143f | lea edx, [edi + edi] // 2bd0 | sub edx, eax $sequence_14 = { 895608 ffd7 85c0 753c 68???????? } // n = 5, score = 400 // 895608 | mov dword ptr [esi + 8], edx // ffd7 | call edi // 85c0 | test eax, eax // 753c | jne 0x3e // 68???????? | $sequence_15 = { 7514 e8???????? 3d00000600 1bc0 40 a3???????? } // n = 6, score = 400 // 7514 | jne 0x16 // e8???????? | // 3d00000600 | cmp eax, 0x60000 // 1bc0 | sbb eax, eax // 40 | inc eax // a3???????? | condition: 7 of them and filesize < 933888 }
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