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rule win_cueisfry_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.cueisfry." 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.cueisfry" 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???????? b8???????? c3 8b45ec c745fcffffffff 85c0 7406 } // n = 7, score = 100 // ff15???????? | // b8???????? | // c3 | ret // 8b45ec | mov eax, dword ptr [ebp - 0x14] // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 85c0 | test eax, eax // 7406 | je 8 $sequence_1 = { f3a5 52 e8???????? 8d44241c } // n = 4, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 52 | push edx // e8???????? | // 8d44241c | lea eax, [esp + 0x1c] $sequence_2 = { e8???????? 85c0 750c 55 ff15???????? e9???????? } // n = 6, score = 100 // e8???????? | // 85c0 | test eax, eax // 750c | jne 0xe // 55 | push ebp // ff15???????? | // e9???????? | $sequence_3 = { 8944241c 7c0d 80f95a 7f08 0fbee9 } // n = 5, score = 100 // 8944241c | mov dword ptr [esp + 0x1c], eax // 7c0d | jl 0xf // 80f95a | cmp cl, 0x5a // 7f08 | jg 0xa // 0fbee9 | movsx ebp, cl $sequence_4 = { 8975dc e8???????? 8b45ec 3bc7 750d } // n = 5, score = 100 // 8975dc | mov dword ptr [ebp - 0x24], esi // e8???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 3bc7 | cmp eax, edi // 750d | jne 0xf $sequence_5 = { 8d4c2408 50 e8???????? b91f000000 33c0 8d7c2431 c644243000 } // n = 7, score = 100 // 8d4c2408 | lea ecx, [esp + 8] // 50 | push eax // e8???????? | // b91f000000 | mov ecx, 0x1f // 33c0 | xor eax, eax // 8d7c2431 | lea edi, [esp + 0x31] // c644243000 | mov byte ptr [esp + 0x30], 0 $sequence_6 = { ff15???????? 8bb424a8010000 8d4c240c 51 8bce } // n = 5, score = 100 // ff15???????? | // 8bb424a8010000 | mov esi, dword ptr [esp + 0x1a8] // 8d4c240c | lea ecx, [esp + 0xc] // 51 | push ecx // 8bce | mov ecx, esi $sequence_7 = { 5f 5e 5d 32c0 5b 81c424030000 c3 } // n = 7, score = 100 // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 32c0 | xor al, al // 5b | pop ebx // 81c424030000 | add esp, 0x324 // c3 | ret $sequence_8 = { 8d4c240c c68424a001000001 e8???????? 8d8c24ac010000 889c24a0010000 e8???????? } // n = 6, score = 100 // 8d4c240c | lea ecx, [esp + 0xc] // c68424a001000001 | mov byte ptr [esp + 0x1a0], 1 // e8???????? | // 8d8c24ac010000 | lea ecx, [esp + 0x1ac] // 889c24a0010000 | mov byte ptr [esp + 0x1a0], bl // e8???????? | $sequence_9 = { 6a00 ff15???????? 68d0070000 ff15???????? 8d94249c000000 6a00 } // n = 6, score = 100 // 6a00 | push 0 // ff15???????? | // 68d0070000 | push 0x7d0 // ff15???????? | // 8d94249c000000 | lea edx, [esp + 0x9c] // 6a00 | push 0 condition: 7 of them and filesize < 81920 }
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