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rule win_artra_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.artra." 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.artra" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b442410 5f 5e 83c41c c21000 5f 33c0 } // n = 7, score = 800 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 5f | pop edi // 5e | pop esi // 83c41c | add esp, 0x1c // c21000 | ret 0x10 // 5f | pop edi // 33c0 | xor eax, eax $sequence_1 = { 5f 8a08 40 84c9 75f9 2bc2 880c30 } // n = 7, score = 700 // 5f | pop edi // 8a08 | mov cl, byte ptr [eax] // 40 | inc eax // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // 880c30 | mov byte ptr [eax + esi], cl $sequence_2 = { 75f9 2bc7 3bc8 72e3 8bc6 } // n = 5, score = 700 // 75f9 | jne 0xfffffffb // 2bc7 | sub eax, edi // 3bc8 | cmp ecx, eax // 72e3 | jb 0xffffffe5 // 8bc6 | mov eax, esi $sequence_3 = { 57 33c9 8d7801 8da42400000000 8a10 } // n = 5, score = 700 // 57 | push edi // 33c9 | xor ecx, ecx // 8d7801 | lea edi, [eax + 1] // 8da42400000000 | lea esp, [esp] // 8a10 | mov dl, byte ptr [eax] $sequence_4 = { 800431f3 8bc6 41 8d7801 } // n = 4, score = 700 // 800431f3 | add byte ptr [ecx + esi], 0xf3 // 8bc6 | mov eax, esi // 41 | inc ecx // 8d7801 | lea edi, [eax + 1] $sequence_5 = { 72e3 8bc6 8d5001 5f 8a08 } // n = 5, score = 700 // 72e3 | jb 0xffffffe5 // 8bc6 | mov eax, esi // 8d5001 | lea edx, [eax + 1] // 5f | pop edi // 8a08 | mov cl, byte ptr [eax] $sequence_6 = { 2bc2 03fb 8a4f01 47 } // n = 4, score = 600 // 2bc2 | sub eax, edx // 03fb | add edi, ebx // 8a4f01 | mov cl, byte ptr [edi + 1] // 47 | inc edi $sequence_7 = { 85ff 0f8488000000 6a00 57 ff15???????? } // n = 5, score = 600 // 85ff | test edi, edi // 0f8488000000 | je 0x8e // 6a00 | push 0 // 57 | push edi // ff15???????? | $sequence_8 = { 8b2d???????? 90 8b542410 8d4c2410 51 } // n = 5, score = 600 // 8b2d???????? | // 90 | nop // 8b542410 | mov edx, dword ptr [esp + 0x10] // 8d4c2410 | lea ecx, [esp + 0x10] // 51 | push ecx $sequence_9 = { 40 42 84c9 75f6 e8???????? } // n = 5, score = 600 // 40 | inc eax // 42 | inc edx // 84c9 | test cl, cl // 75f6 | jne 0xfffffff8 // e8???????? | $sequence_10 = { e8???????? 8b3d???????? 6a00 6a00 6a00 8d442414 50 } // n = 7, score = 600 // e8???????? | // 8b3d???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8d442414 | lea eax, [esp + 0x14] // 50 | push eax $sequence_11 = { 57 ff15???????? 6a6d 56 ff15???????? 8bf0 } // n = 6, score = 600 // 57 | push edi // ff15???????? | // 6a6d | push 0x6d // 56 | push esi // ff15???????? | // 8bf0 | mov esi, eax $sequence_12 = { 6a00 8935???????? ff15???????? 8bf8 85ff 0f8488000000 } // n = 6, score = 600 // 6a00 | push 0 // 8935???????? | // ff15???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f8488000000 | je 0x8e $sequence_13 = { 8d442414 50 ffd7 85c0 7445 } // n = 5, score = 600 // 8d442414 | lea eax, [esp + 0x14] // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax // 7445 | je 0x47 $sequence_14 = { 8b1d???????? 55 8b2d???????? 90 } // n = 4, score = 600 // 8b1d???????? | // 55 | push ebp // 8b2d???????? | // 90 | nop $sequence_15 = { 8a15???????? 8817 8d842484020000 8bc8 8bff 8a10 } // n = 6, score = 500 // 8a15???????? | // 8817 | mov byte ptr [edi], dl // 8d842484020000 | lea eax, [esp + 0x284] // 8bc8 | mov ecx, eax // 8bff | mov edi, edi // 8a10 | mov dl, byte ptr [eax] $sequence_16 = { e8???????? 8bce c644241800 e8???????? 8b47fc } // n = 5, score = 500 // e8???????? | // 8bce | mov ecx, esi // c644241800 | mov byte ptr [esp + 0x18], 0 // e8???????? | // 8b47fc | mov eax, dword ptr [edi - 4] $sequence_17 = { c64424204d c644242161 c644242263 c644242368 c64424256e c644242665 c644242747 } // n = 7, score = 500 // c64424204d | mov byte ptr [esp + 0x20], 0x4d // c644242161 | mov byte ptr [esp + 0x21], 0x61 // c644242263 | mov byte ptr [esp + 0x22], 0x63 // c644242368 | mov byte ptr [esp + 0x23], 0x68 // c64424256e | mov byte ptr [esp + 0x25], 0x6e // c644242665 | mov byte ptr [esp + 0x26], 0x65 // c644242747 | mov byte ptr [esp + 0x27], 0x47 $sequence_18 = { 2bcd 8bfe 8d642400 8a1401 fec2 } // n = 5, score = 400 // 2bcd | sub ecx, ebp // 8bfe | mov edi, esi // 8d642400 | lea esp, [esp] // 8a1401 | mov dl, byte ptr [ecx + eax] // fec2 | inc dl $sequence_19 = { 33c0 0fbe0c30 8d519f 83fa05 } // n = 4, score = 400 // 33c0 | xor eax, eax // 0fbe0c30 | movsx ecx, byte ptr [eax + esi] // 8d519f | lea edx, [ecx - 0x61] // 83fa05 | cmp edx, 5 $sequence_20 = { be0c000000 8a1401 feca 8810 } // n = 4, score = 400 // be0c000000 | mov esi, 0xc // 8a1401 | mov dl, byte ptr [ecx + eax] // feca | dec dl // 8810 | mov byte ptr [eax], dl $sequence_21 = { ffd6 85c0 75cc 5d 5b 8b442410 } // n = 6, score = 400 // ffd6 | call esi // 85c0 | test eax, eax // 75cc | jne 0xffffffce // 5d | pop ebp // 5b | pop ebx // 8b442410 | mov eax, dword ptr [esp + 0x10] $sequence_22 = { 83c40c 8b4508 8b7dfc 8be5 5d c3 33c0 } // n = 7, score = 400 // 83c40c | add esp, 0xc // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b7dfc | mov edi, dword ptr [ebp - 4] // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 33c0 | xor eax, eax $sequence_23 = { e8???????? 6a00 8d44242c 50 6a00 683f000f00 6a00 } // n = 7, score = 200 // e8???????? | // 6a00 | push 0 // 8d44242c | lea eax, [esp + 0x2c] // 50 | push eax // 6a00 | push 0 // 683f000f00 | push 0xf003f // 6a00 | push 0 $sequence_24 = { 51 ffd6 85c0 7444 } // n = 4, score = 200 // 51 | push ecx // ffd6 | call esi // 85c0 | test eax, eax // 7444 | je 0x46 condition: 7 of them and filesize < 811008 }
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