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rule win_ranbyus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.ranbyus." 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.ranbyus" 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 = { ff7608 e8???????? 89460c 8b06 59 894604 } // n = 6, score = 1100 // ff7608 | push dword ptr [esi + 8] // e8???????? | // 89460c | mov dword ptr [esi + 0xc], eax // 8b06 | mov eax, dword ptr [esi] // 59 | pop ecx // 894604 | mov dword ptr [esi + 4], eax $sequence_1 = { a1???????? 85c0 751c 6a04 e8???????? } // n = 5, score = 1100 // a1???????? | // 85c0 | test eax, eax // 751c | jne 0x1e // 6a04 | push 4 // e8???????? | $sequence_2 = { 59 ff7608 e8???????? 897e08 } // n = 4, score = 1100 // 59 | pop ecx // ff7608 | push dword ptr [esi + 8] // e8???????? | // 897e08 | mov dword ptr [esi + 8], edi $sequence_3 = { e8???????? 59 8b4e05 89410b 8b4605 39780b 7407 } // n = 7, score = 1100 // e8???????? | // 59 | pop ecx // 8b4e05 | mov ecx, dword ptr [esi + 5] // 89410b | mov dword ptr [ecx + 0xb], eax // 8b4605 | mov eax, dword ptr [esi + 5] // 39780b | cmp dword ptr [eax + 0xb], edi // 7407 | je 9 $sequence_4 = { a3???????? 8a4576 a2???????? 8b45e8 a3???????? } // n = 5, score = 1100 // a3???????? | // 8a4576 | mov al, byte ptr [ebp + 0x76] // a2???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // a3???????? | $sequence_5 = { a3???????? 8a4576 a2???????? 8b45e8 a3???????? e8???????? } // n = 6, score = 1100 // a3???????? | // 8a4576 | mov al, byte ptr [ebp + 0x76] // a2???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // a3???????? | // e8???????? | $sequence_6 = { 0f84c5000000 3c5c 75f1 84c0 0f84b9000000 46 } // n = 6, score = 1100 // 0f84c5000000 | je 0xcb // 3c5c | cmp al, 0x5c // 75f1 | jne 0xfffffff3 // 84c0 | test al, al // 0f84b9000000 | je 0xbf // 46 | inc esi $sequence_7 = { 751b 46 8a06 84c0 740c } // n = 5, score = 1100 // 751b | jne 0x1d // 46 | inc esi // 8a06 | mov al, byte ptr [esi] // 84c0 | test al, al // 740c | je 0xe $sequence_8 = { 7405 48 75f7 eb01 } // n = 4, score = 1100 // 7405 | je 7 // 48 | dec eax // 75f7 | jne 0xfffffff9 // eb01 | jmp 3 $sequence_9 = { 5f eb03 83c8ff 5e 5b c3 e8???????? } // n = 7, score = 1100 // 5f | pop edi // eb03 | jmp 5 // 83c8ff | or eax, 0xffffffff // 5e | pop esi // 5b | pop ebx // c3 | ret // e8???????? | condition: 7 of them and filesize < 638976 }
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