Hopscotch is part of the Regin framework.
rule win_hopscotch_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.hopscotch." 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.hopscotch" 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 = { 8b1d???????? 8d8c24a4010000 6a00 6a00 6a03 6a00 } // n = 6, score = 100 // 8b1d???????? | // 8d8c24a4010000 | lea ecx, [esp + 0x1a4] // 6a00 | push 0 // 6a00 | push 0 // 6a03 | push 3 // 6a00 | push 0 $sequence_1 = { 5b 81c400010000 c3 8b8c2410010000 51 57 } // n = 6, score = 100 // 5b | pop ebx // 81c400010000 | add esp, 0x100 // c3 | ret // 8b8c2410010000 | mov ecx, dword ptr [esp + 0x110] // 51 | push ecx // 57 | push edi $sequence_2 = { ffd7 56 53 8d4c2414 6a08 51 e8???????? } // n = 7, score = 100 // ffd7 | call edi // 56 | push esi // 53 | push ebx // 8d4c2414 | lea ecx, [esp + 0x14] // 6a08 | push 8 // 51 | push ecx // e8???????? | $sequence_3 = { ffd7 85c0 753c 8b35???????? ffd6 83f802 742f } // n = 7, score = 100 // ffd7 | call edi // 85c0 | test eax, eax // 753c | jne 0x3e // 8b35???????? | // ffd6 | call esi // 83f802 | cmp eax, 2 // 742f | je 0x31 $sequence_4 = { 7554 33f6 89b5dcfeffff 8b3d???????? 83fe05 7332 } // n = 6, score = 100 // 7554 | jne 0x56 // 33f6 | xor esi, esi // 89b5dcfeffff | mov dword ptr [ebp - 0x124], esi // 8b3d???????? | // 83fe05 | cmp esi, 5 // 7332 | jae 0x34 $sequence_5 = { 81ec80090000 53 56 57 68???????? e8???????? } // n = 6, score = 100 // 81ec80090000 | sub esp, 0x980 // 53 | push ebx // 56 | push esi // 57 | push edi // 68???????? | // e8???????? | $sequence_6 = { 68???????? e8???????? 83c408 8d9424a8020000 } // n = 4, score = 100 // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 8d9424a8020000 | lea edx, [esp + 0x2a8] $sequence_7 = { 56 57 ff15???????? 85c0 7514 8d442414 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // ff15???????? | // 85c0 | test eax, eax // 7514 | jne 0x16 // 8d442414 | lea eax, [esp + 0x14] $sequence_8 = { c7442400ffffffff 50 c7442408ffffffff e8???????? 83c404 8d4c2400 } // n = 6, score = 100 // c7442400ffffffff | mov dword ptr [esp], 0xffffffff // 50 | push eax // c7442408ffffffff | mov dword ptr [esp + 8], 0xffffffff // e8???????? | // 83c404 | add esp, 4 // 8d4c2400 | lea ecx, [esp] $sequence_9 = { 8b3d???????? 83c408 8d442408 50 ffd7 } // n = 5, score = 100 // 8b3d???????? | // 83c408 | add esp, 8 // 8d442408 | lea eax, [esp + 8] // 50 | push eax // ffd7 | call edi condition: 7 of them and filesize < 1143808 }
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