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rule win_beepservice_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.beepservice." 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.beepservice" 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 = { 83c404 c3 6a00 6a00 6a00 } // n = 5, score = 1000 // 83c404 | add esp, 4 // c3 | ret // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_1 = { 6a00 6a00 6a00 56 6a00 6a00 57 } // n = 7, score = 1000 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 56 | push esi // 6a00 | push 0 // 6a00 | push 0 // 57 | push edi $sequence_2 = { 85c0 7407 c745d801000000 c745fcffffffff } // n = 4, score = 1000 // 85c0 | test eax, eax // 7407 | je 9 // c745d801000000 | mov dword ptr [ebp - 0x28], 1 // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff $sequence_3 = { 52 ffd7 83c408 85c0 75e2 8b442414 } // n = 6, score = 1000 // 52 | push edx // ffd7 | call edi // 83c408 | add esp, 8 // 85c0 | test eax, eax // 75e2 | jne 0xffffffe4 // 8b442414 | mov eax, dword ptr [esp + 0x14] $sequence_4 = { 75e2 8b442414 5f 5e 5b } // n = 5, score = 1000 // 75e2 | jne 0xffffffe4 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_5 = { ff15???????? 668bf0 68???????? 81f699990000 } // n = 4, score = 1000 // ff15???????? | // 668bf0 | mov si, ax // 68???????? | // 81f699990000 | xor esi, 0x9999 $sequence_6 = { 6a40 6800100000 8b5d10 53 56 57 ff15???????? } // n = 7, score = 1000 // 6a40 | push 0x40 // 6800100000 | push 0x1000 // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 53 | push ebx // 56 | push esi // 57 | push edi // ff15???????? | $sequence_7 = { 85c0 750f 6800800000 6a00 56 57 ff15???????? } // n = 7, score = 1000 // 85c0 | test eax, eax // 750f | jne 0x11 // 6800800000 | push 0x8000 // 6a00 | push 0 // 56 | push esi // 57 | push edi // ff15???????? | $sequence_8 = { 7420 6a00 6a00 6a00 56 6a00 6a00 } // n = 7, score = 1000 // 7420 | je 0x22 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 56 | push esi // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { ff15???????? 85c0 7420 6a00 6a00 6a00 56 } // n = 7, score = 1000 // ff15???????? | // 85c0 | test eax, eax // 7420 | je 0x22 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 56 | push esi condition: 7 of them and filesize < 253952 }
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