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rule win_snifula_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.snifula." 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.snifula" 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 = { 05ff0f0000 2500f0ffff 3bc3 7702 8bc3 f7c100000002 7402 } // n = 7, score = 200 // 05ff0f0000 | add eax, 0xfff // 2500f0ffff | and eax, 0xfffff000 // 3bc3 | cmp eax, ebx // 7702 | ja 4 // 8bc3 | mov eax, ebx // f7c100000002 | test ecx, 0x2000000 // 7402 | je 4 $sequence_1 = { 85c0 0f84a2000000 57 50 ff7508 e8???????? 8b7d0c } // n = 7, score = 200 // 85c0 | test eax, eax // 0f84a2000000 | je 0xa8 // 57 | push edi // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 8b7d0c | mov edi, dword ptr [ebp + 0xc] $sequence_2 = { ff35???????? ffd7 ff742420 8944242c } // n = 4, score = 200 // ff35???????? | // ffd7 | call edi // ff742420 | push dword ptr [esp + 0x20] // 8944242c | mov dword ptr [esp + 0x2c], eax $sequence_3 = { 8b83e8180000 99 2bc2 8bf0 d1fe eb09 } // n = 6, score = 200 // 8b83e8180000 | mov eax, dword ptr [ebx + 0x18e8] // 99 | cdq // 2bc2 | sub eax, edx // 8bf0 | mov esi, eax // d1fe | sar esi, 1 // eb09 | jmp 0xb $sequence_4 = { 8d45f8 50 c745f498000000 e8???????? 85c0 7569 57 } // n = 7, score = 200 // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // c745f498000000 | mov dword ptr [ebp - 0xc], 0x98 // e8???????? | // 85c0 | test eax, eax // 7569 | jne 0x6b // 57 | push edi $sequence_5 = { ffd3 56 ffd7 5f 5b c3 } // n = 6, score = 200 // ffd3 | call ebx // 56 | push esi // ffd7 | call edi // 5f | pop edi // 5b | pop ebx // c3 | ret $sequence_6 = { 8bf0 3bf7 7505 6a02 5b eb40 6a5c } // n = 7, score = 200 // 8bf0 | mov esi, eax // 3bf7 | cmp esi, edi // 7505 | jne 7 // 6a02 | push 2 // 5b | pop ebx // eb40 | jmp 0x42 // 6a5c | push 0x5c $sequence_7 = { 8d4608 50 6a01 6a00 ffd7 85c0 7519 } // n = 7, score = 200 // 8d4608 | lea eax, [esi + 8] // 50 | push eax // 6a01 | push 1 // 6a00 | push 0 // ffd7 | call edi // 85c0 | test eax, eax // 7519 | jne 0x1b $sequence_8 = { 8b03 e8???????? 8945fc 85c0 750f 394508 750a } // n = 7, score = 200 // 8b03 | mov eax, dword ptr [ebx] // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax // 750f | jne 0x11 // 394508 | cmp dword ptr [ebp + 8], eax // 750a | jne 0xc $sequence_9 = { 33c9 6a00 2bf8 51 8bc6 e8???????? 8b06 } // n = 7, score = 200 // 33c9 | xor ecx, ecx // 6a00 | push 0 // 2bf8 | sub edi, eax // 51 | push ecx // 8bc6 | mov eax, esi // e8???????? | // 8b06 | mov eax, dword ptr [esi] condition: 7 of them and filesize < 188416 }
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