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rule win_xpertrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.xpertrat." 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.xpertrat" 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 = { ff0468 ff0a 250004003c 6c } // n = 4, score = 200 // ff0468 | inc dword ptr [eax + ebp*2] // ff0a | dec dword ptr [edx] // 250004003c | and eax, 0x3c000400 // 6c | insb byte ptr es:[edi], dx $sequence_1 = { 0d80000700 0474 ff0478 ff05???????? 000d???????? 0878ff 0d98000700 } // n = 7, score = 200 // 0d80000700 | or eax, 0x70080 // 0474 | add al, 0x74 // ff0478 | inc dword ptr [eax + edi*2] // ff05???????? | // 000d???????? | // 0878ff | or byte ptr [eax - 1], bh // 0d98000700 | or eax, 0x70098 $sequence_2 = { 0000 ae 045c ff4d40 ff08 40 0430 } // n = 7, score = 200 // 0000 | add byte ptr [eax], al // ae | scasb al, byte ptr es:[edi] // 045c | add al, 0x5c // ff4d40 | dec dword ptr [ebp + 0x40] // ff08 | dec dword ptr [eax] // 40 | inc eax // 0430 | add al, 0x30 $sequence_3 = { 008a3800cc1c 5e 006c70ff 0808 008f38001b26 001b } // n = 6, score = 200 // 008a3800cc1c | add byte ptr [edx + 0x1ccc0038], cl // 5e | pop esi // 006c70ff | add byte ptr [eax + esi*2 - 1], ch // 0808 | or byte ptr [eax], cl // 008f38001b26 | add byte ptr [edi + 0x261b0038], cl // 001b | add byte ptr [ebx], bl $sequence_4 = { 0000 00a1cc004400 0bc0 7402 } // n = 4, score = 200 // 0000 | add byte ptr [eax], al // 00a1cc004400 | add byte ptr [ecx + 0x4400cc], ah // 0bc0 | or eax, eax // 7402 | je 4 $sequence_5 = { 40 0430 ff0a 4c 000c00 } // n = 5, score = 200 // 40 | inc eax // 0430 | add al, 0x30 // ff0a | dec dword ptr [edx] // 4c | dec esp // 000c00 | add byte ptr [eax + eax], cl $sequence_6 = { 250004003c 6c 70ff 0808 } // n = 4, score = 200 // 250004003c | and eax, 0x3c000400 // 6c | insb byte ptr es:[edi], dx // 70ff | jo 1 // 0808 | or byte ptr [eax], cl $sequence_7 = { 70ff 0808 008a3800cc1c 5e } // n = 4, score = 200 // 70ff | jo 1 // 0808 | or byte ptr [eax], cl // 008a3800cc1c | add byte ptr [edx + 0x1ccc0038], cl // 5e | pop esi $sequence_8 = { f6c401 7407 b901000000 eb02 } // n = 4, score = 100 // f6c401 | test ah, 1 // 7407 | je 9 // b901000000 | mov ecx, 1 // eb02 | jmp 4 $sequence_9 = { f6c401 740a c78534ffffff00000000 db45c0 } // n = 4, score = 100 // f6c401 | test ah, 1 // 740a | je 0xc // c78534ffffff00000000 | mov dword ptr [ebp - 0xcc], 0 // db45c0 | fild dword ptr [ebp - 0x40] $sequence_10 = { f6c401 7407 bf01000000 eb02 } // n = 4, score = 100 // f6c401 | test ah, 1 // 7407 | je 9 // bf01000000 | mov edi, 1 // eb02 | jmp 4 $sequence_11 = { f6c401 7403 897d98 d945cc } // n = 4, score = 100 // f6c401 | test ah, 1 // 7403 | je 5 // 897d98 | mov dword ptr [ebp - 0x68], edi // d945cc | fld dword ptr [ebp - 0x34] $sequence_12 = { f6c401 7407 b801000000 eb02 33c0 33d2 } // n = 6, score = 100 // f6c401 | test ah, 1 // 7407 | je 9 // b801000000 | mov eax, 1 // eb02 | jmp 4 // 33c0 | xor eax, eax // 33d2 | xor edx, edx $sequence_13 = { f6c401 740c c7850cfeffff01000000 eb0a } // n = 4, score = 100 // f6c401 | test ah, 1 // 740c | je 0xe // c7850cfeffff01000000 | mov dword ptr [ebp - 0x1f4], 1 // eb0a | jmp 0xc $sequence_14 = { f6c401 740c c78514ffffff01000000 eb0a } // n = 4, score = 100 // f6c401 | test ah, 1 // 740c | je 0xe // c78514ffffff01000000 | mov dword ptr [ebp - 0xec], 1 // eb0a | jmp 0xc $sequence_15 = { f6c401 7403 895dc0 d901 d85dd8 dfe0 f6c401 } // n = 7, score = 100 // f6c401 | test ah, 1 // 7403 | je 5 // 895dc0 | mov dword ptr [ebp - 0x40], ebx // d901 | fld dword ptr [ecx] // d85dd8 | fcomp dword ptr [ebp - 0x28] // dfe0 | fnstsw ax // f6c401 | test ah, 1 condition: 7 of them and filesize < 8560640 }
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