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rule win_coviper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.coviper" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 8b55e4 58 e8???????? 0f8465010000 53 e8???????? } // n = 6, score = 100 // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 58 | pop eax // e8???????? | // 0f8465010000 | je 0x16b // 53 | push ebx // e8???????? | $sequence_1 = { 5f 40 003a 60 40 00494e } // n = 6, score = 100 // 5f | pop edi // 40 | inc eax // 003a | add byte ptr [edx], bh // 60 | pushal // 40 | inc eax // 00494e | add byte ptr [ecx + 0x4e], cl $sequence_2 = { 6a02 68???????? e8???????? 83f801 1bc0 40 880424 } // n = 7, score = 100 // 6a02 | push 2 // 68???????? | // e8???????? | // 83f801 | cmp eax, 1 // 1bc0 | sbb eax, eax // 40 | inc eax // 880424 | mov byte ptr [esp], al $sequence_3 = { 240f 25ff000000 40 ba???????? 8a4402ff 5a } // n = 6, score = 100 // 240f | and al, 0xf // 25ff000000 | and eax, 0xff // 40 | inc eax // ba???????? | // 8a4402ff | mov al, byte ptr [edx + eax - 1] // 5a | pop edx $sequence_4 = { 003a 60 40 00494e 46 4e 41 } // n = 7, score = 100 // 003a | add byte ptr [edx], bh // 60 | pushal // 40 | inc eax // 00494e | add byte ptr [ecx + 0x4e], cl // 46 | inc esi // 4e | dec esi // 41 | inc ecx $sequence_5 = { 83e21f 8d1492 dbac53372a4000 def9 c1e805 7434 } // n = 6, score = 100 // 83e21f | and edx, 0x1f // 8d1492 | lea edx, [edx + edx*4] // dbac53372a4000 | fld xword ptr [ebx + edx*2 + 0x402a37] // def9 | fdivp st(1) // c1e805 | shr eax, 5 // 7434 | je 0x36 $sequence_6 = { 731a 89c1 e8???????? 8db449245f4000 0375ec b903000000 f3a4 } // n = 7, score = 100 // 731a | jae 0x1c // 89c1 | mov ecx, eax // e8???????? | // 8db449245f4000 | lea esi, [ecx + ecx*2 + 0x405f24] // 0375ec | add esi, dword ptr [ebp - 0x14] // b903000000 | mov ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] $sequence_7 = { 80fb58 0f843cfaffff b90a000000 80fb55 0f842efaffff e9???????? } // n = 6, score = 100 // 80fb58 | cmp bl, 0x58 // 0f843cfaffff | je 0xfffffa42 // b90a000000 | mov ecx, 0xa // 80fb55 | cmp bl, 0x55 // 0f842efaffff | je 0xfffffa34 // e9???????? | $sequence_8 = { 84c0 7504 c6042400 8b442404 50 } // n = 5, score = 100 // 84c0 | test al, al // 7504 | jne 6 // c6042400 | mov byte ptr [esp], 0 // 8b442404 | mov eax, dword ptr [esp + 4] // 50 | push eax $sequence_9 = { 6800040000 53 e8???????? 6a00 68???????? 68000c0000 } // n = 6, score = 100 // 6800040000 | push 0x400 // 53 | push ebx // e8???????? | // 6a00 | push 0 // 68???????? | // 68000c0000 | push 0xc00 condition: 7 of them and filesize < 146432 }
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