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rule win_apocalypse_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.apocalypse_ransom." 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.apocalypse_ransom" 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 = { ff15???????? 68???????? 8d84240c040000 50 ff15???????? 85c0 742f } // n = 7, score = 200 // ff15???????? | // 68???????? | // 8d84240c040000 | lea eax, [esp + 0x40c] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 742f | je 0x31 $sequence_1 = { 83f8ff 755f 6a01 8d44240c 50 8d8c2410040000 } // n = 6, score = 200 // 83f8ff | cmp eax, -1 // 755f | jne 0x61 // 6a01 | push 1 // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax // 8d8c2410040000 | lea ecx, [esp + 0x410] $sequence_2 = { 0bfb ff15???????? 33d2 83f802 } // n = 4, score = 200 // 0bfb | or edi, ebx // ff15???????? | // 33d2 | xor edx, edx // 83f802 | cmp eax, 2 $sequence_3 = { 8d4c2410 68???????? 51 ff15???????? 83c410 6a00 6a00 } // n = 7, score = 200 // 8d4c2410 | lea ecx, [esp + 0x10] // 68???????? | // 51 | push ecx // ff15???????? | // 83c410 | add esp, 0x10 // 6a00 | push 0 // 6a00 | push 0 $sequence_4 = { ffd6 b801000000 5e 83c418 c3 33c0 } // n = 6, score = 200 // ffd6 | call esi // b801000000 | mov eax, 1 // 5e | pop esi // 83c418 | add esp, 0x18 // c3 | ret // 33c0 | xor eax, eax $sequence_5 = { 68???????? 6a00 ffd7 8bf0 85f6 7504 5f } // n = 7, score = 200 // 68???????? | // 6a00 | push 0 // ffd7 | call edi // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7504 | jne 6 // 5f | pop edi $sequence_6 = { 83f8ff 7411 50 ff15???????? 8d0424 50 ff15???????? } // n = 7, score = 200 // 83f8ff | cmp eax, -1 // 7411 | je 0x13 // 50 | push eax // ff15???????? | // 8d0424 | lea eax, [esp] // 50 | push eax // ff15???????? | $sequence_7 = { 83c40c 57 53 ff15???????? 6800800000 } // n = 5, score = 200 // 83c40c | add esp, 0xc // 57 | push edi // 53 | push ebx // ff15???????? | // 6800800000 | push 0x8000 $sequence_8 = { ffd7 85c0 7440 8b1d???????? 8b2d???????? 8b542410 8d4c2410 } // n = 7, score = 200 // ffd7 | call edi // 85c0 | test eax, eax // 7440 | je 0x42 // 8b1d???????? | // 8b2d???????? | // 8b542410 | mov edx, dword ptr [esp + 0x10] // 8d4c2410 | lea ecx, [esp + 0x10] $sequence_9 = { 6a03 6800000040 52 ffd6 } // n = 4, score = 200 // 6a03 | push 3 // 6800000040 | push 0x40000000 // 52 | push edx // ffd6 | call esi condition: 7 of them and filesize < 40960 }
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