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rule win_torrentlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 740a 48 85c0 7ff4 5f 33c0 5e } // n = 7, score = 400 // 740a | je 0xc // 48 | dec eax // 85c0 | test eax, eax // 7ff4 | jg 0xfffffff6 // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi $sequence_2 = { 7514 e8???????? 3d00000600 1bc0 40 } // n = 5, score = 400 // 7514 | jne 0x16 // e8???????? | // 3d00000600 | cmp eax, 0x60000 // 1bc0 | sbb eax, eax // 40 | inc eax $sequence_3 = { 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_4 = { be03000000 8bc6 5e 5f c3 be02000000 8bc6 } // n = 7, score = 400 // be03000000 | mov esi, 3 // 8bc6 | mov eax, esi // 5e | pop esi // 5f | pop edi // c3 | ret // be02000000 | mov esi, 2 // 8bc6 | mov eax, esi $sequence_5 = { 7522 68???????? ff15???????? 85c0 7413 } // n = 5, score = 400 // 7522 | jne 0x24 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7413 | je 0x15 $sequence_6 = { 50 a1???????? 56 50 ff15???????? 85c0 8d4601 } // n = 7, score = 400 // 50 | push eax // a1???????? | // 56 | push esi // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 8d4601 | lea eax, [esi + 1] $sequence_7 = { 6a00 51 ff15???????? 8bc6 5e 5f } // n = 6, score = 400 // 6a00 | push 0 // 51 | push ecx // ff15???????? | // 8bc6 | mov eax, esi // 5e | pop esi // 5f | pop edi $sequence_8 = { c3 b904000000 8bc1 5e } // n = 4, score = 400 // c3 | ret // b904000000 | mov ecx, 4 // 8bc1 | mov eax, ecx // 5e | pop esi $sequence_9 = { 85c0 7525 68???????? b8???????? bb???????? e8???????? } // n = 6, score = 400 // 85c0 | test eax, eax // 7525 | jne 0x27 // 68???????? | // b8???????? | // bb???????? | // e8???????? | $sequence_10 = { 68???????? 895608 ffd7 85c0 753c } // n = 5, score = 400 // 68???????? | // 895608 | mov dword ptr [esi + 8], edx // ffd7 | call edi // 85c0 | test eax, eax // 753c | jne 0x3e $sequence_11 = { 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_12 = { 7519 8b0d???????? 51 ff15???????? c705????????00000000 eb39 8b15???????? } // n = 7, score = 400 // 7519 | jne 0x1b // 8b0d???????? | // 51 | push ecx // ff15???????? | // c705????????00000000 | // eb39 | jmp 0x3b // 8b15???????? | $sequence_13 = { 750b 68???????? ff15???????? 8bc3 } // n = 4, score = 400 // 750b | jne 0xd // 68???????? | // ff15???????? | // 8bc3 | mov eax, ebx $sequence_14 = { 8bcf c1e90b 33c8 c1e908 } // n = 4, score = 400 // 8bcf | mov ecx, edi // c1e90b | shr ecx, 0xb // 33c8 | xor ecx, eax // c1e908 | shr ecx, 8 $sequence_15 = { 6a01 68???????? ff15???????? 85c0 7522 68???????? } // n = 6, score = 400 // 6a01 | push 1 // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7522 | jne 0x24 // 68???????? | condition: 7 of them and filesize < 933888 }
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