Actor(s): MONTY SPIDER
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rule win_necurs_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.necurs." 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.necurs" 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 = { 397508 7604 33c0 eb12 } // n = 4, score = 1300 // 397508 | cmp dword ptr [ebp + 8], esi // 7604 | jbe 6 // 33c0 | xor eax, eax // eb12 | jmp 0x14 $sequence_1 = { 13f2 a3???????? 8935???????? 890d???????? } // n = 4, score = 1300 // 13f2 | adc esi, edx // a3???????? | // 8935???????? | // 890d???????? | $sequence_2 = { 890d???????? 8bc1 5e c3 55 8bec } // n = 6, score = 1300 // 890d???????? | // 8bc1 | mov eax, ecx // 5e | pop esi // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_3 = { 0f31 8bc8 a1???????? 56 } // n = 4, score = 1300 // 0f31 | rdtsc // 8bc8 | mov ecx, eax // a1???????? | // 56 | push esi $sequence_4 = { 33c0 eb12 e8???????? 2b7508 } // n = 4, score = 1300 // 33c0 | xor eax, eax // eb12 | jmp 0x14 // e8???????? | // 2b7508 | sub esi, dword ptr [ebp + 8] $sequence_5 = { 33d2 030d???????? a3???????? a1???????? } // n = 4, score = 1300 // 33d2 | xor edx, edx // 030d???????? | // a3???????? | // a1???????? | $sequence_6 = { 56 8bf2 ba06e0a636 f7e2 } // n = 4, score = 1300 // 56 | push esi // 8bf2 | mov esi, edx // ba06e0a636 | mov edx, 0x36a6e006 // f7e2 | mul edx $sequence_7 = { 33d2 46 f7f6 8bc2 034508 5e } // n = 6, score = 1300 // 33d2 | xor edx, edx // 46 | inc esi // f7f6 | div esi // 8bc2 | mov eax, edx // 034508 | add eax, dword ptr [ebp + 8] // 5e | pop esi $sequence_8 = { 8d85ecfbffff 57 50 e8???????? 83c410 } // n = 5, score = 1100 // 8d85ecfbffff | lea eax, [ebp - 0x414] // 57 | push edi // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 $sequence_9 = { 33d7 33c1 52 50 } // n = 4, score = 900 // 33d7 | xor edx, edi // 33c1 | xor eax, ecx // 52 | push edx // 50 | push eax $sequence_10 = { 6a7d 50 ffd6 59 } // n = 4, score = 800 // 6a7d | push 0x7d // 50 | push eax // ffd6 | call esi // 59 | pop ecx $sequence_11 = { 57 57 8d8574ffffff 50 } // n = 4, score = 800 // 57 | push edi // 57 | push edi // 8d8574ffffff | lea eax, [ebp - 0x8c] // 50 | push eax $sequence_12 = { a1???????? 33d2 f7f1 ff05???????? } // n = 4, score = 800 // a1???????? | // 33d2 | xor edx, edx // f7f1 | div ecx // ff05???????? | $sequence_13 = { 50 ffd6 8bf8 59 59 85ff 74df } // n = 7, score = 800 // 50 | push eax // ffd6 | call esi // 8bf8 | mov edi, eax // 59 | pop ecx // 59 | pop ecx // 85ff | test edi, edi // 74df | je 0xffffffe1 $sequence_14 = { 6848640300 68da279b71 33d7 33c1 } // n = 4, score = 800 // 6848640300 | push 0x36448 // 68da279b71 | push 0x719b27da // 33d7 | xor edx, edi // 33c1 | xor eax, ecx $sequence_15 = { 5e 5f c9 c3 8b35???????? } // n = 5, score = 800 // 5e | pop esi // 5f | pop edi // c9 | leave // c3 | ret // 8b35???????? | condition: 7 of them and filesize < 475136 }
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