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rule win_artra_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" 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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { 5e 83c41c c21000 5f } // n = 4, score = 800 // 5e | pop esi // 83c41c | add esp, 0x1c // c21000 | ret 0x10 // 5f | pop edi $sequence_1 = { 8b442410 5f 5e 83c41c } // n = 4, score = 800 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 5f | pop edi // 5e | pop esi // 83c41c | add esp, 0x1c $sequence_2 = { 2bc7 3bc8 72e3 8bc6 8d5001 5f } // n = 6, score = 700 // 2bc7 | sub eax, edi // 3bc8 | cmp ecx, eax // 72e3 | jb 0xffffffe5 // 8bc6 | mov eax, esi // 8d5001 | lea edx, dword ptr [eax + 1] // 5f | pop edi $sequence_3 = { 8a10 40 84d2 75f9 2bc7 3bc8 72e3 } // n = 7, score = 700 // 8a10 | mov dl, byte ptr [eax] // 40 | inc eax // 84d2 | test dl, dl // 75f9 | jne 0xfffffffb // 2bc7 | sub eax, edi // 3bc8 | cmp ecx, eax // 72e3 | jb 0xffffffe5 $sequence_4 = { 8bc6 41 8d7801 8d9b00000000 } // n = 4, score = 700 // 8bc6 | mov eax, esi // 41 | inc ecx // 8d7801 | lea edi, dword ptr [eax + 1] // 8d9b00000000 | lea ebx, dword ptr [ebx] $sequence_5 = { 51 8bc6 57 33c9 8d7801 8da42400000000 } // n = 6, score = 700 // 51 | push ecx // 8bc6 | mov eax, esi // 57 | push edi // 33c9 | xor ecx, ecx // 8d7801 | lea edi, dword ptr [eax + 1] // 8da42400000000 | lea esp, dword ptr [esp] $sequence_6 = { 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_7 = { 6a00 8d442414 50 ffd7 85c0 7445 53 } // n = 7, score = 600 // 6a00 | push 0 // 8d442414 | lea eax, dword ptr [esp + 0x14] // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax // 7445 | je 0x47 // 53 | push ebx $sequence_8 = { 6a00 8d54241c 52 ffd7 85c0 75cc 5d } // n = 7, score = 600 // 6a00 | push 0 // 8d54241c | lea edx, dword ptr [esp + 0x1c] // 52 | push edx // ffd7 | call edi // 85c0 | test eax, eax // 75cc | jne 0xffffffce // 5d | pop ebp $sequence_9 = { 8a08 880a 40 42 84c9 75f6 e8???????? } // n = 7, score = 600 // 8a08 | mov cl, byte ptr [eax] // 880a | mov byte ptr [edx], cl // 40 | inc eax // 42 | inc edx // 84c9 | test cl, cl // 75f6 | jne 0xfffffff8 // e8???????? | $sequence_10 = { 55 8b2d???????? 90 8b542410 8d4c2410 51 } // n = 6, score = 600 // 55 | push ebp // 8b2d???????? | // 90 | nop // 8b542410 | mov edx, dword ptr [esp + 0x10] // 8d4c2410 | lea ecx, dword ptr [esp + 0x10] // 51 | push ecx $sequence_11 = { 8935???????? ff15???????? 8bf8 85ff 0f8488000000 } // n = 5, score = 600 // 8935???????? | // ff15???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f8488000000 | je 0x8e $sequence_12 = { 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, dword ptr [esp + 0x14] // 50 | push eax $sequence_13 = { 2bc2 03fb 8a4f01 47 84c9 75f8 8bc8 } // n = 7, score = 600 // 2bc2 | sub eax, edx // 03fb | add edi, ebx // 8a4f01 | mov cl, byte ptr [edi + 1] // 47 | inc edi // 84c9 | test cl, cl // 75f8 | jne 0xfffffffa // 8bc8 | mov ecx, eax $sequence_14 = { 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_15 = { 8bf8 83c404 897c2410 899c24ac000000 3bfb 743b } // n = 6, score = 500 // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 897c2410 | mov dword ptr [esp + 0x10], edi // 899c24ac000000 | mov dword ptr [esp + 0xac], ebx // 3bfb | cmp edi, ebx // 743b | je 0x3d $sequence_16 = { a0???????? 8807 8b4c2414 51 ff15???????? 8d842488030000 8bc8 } // n = 7, score = 500 // a0???????? | // 8807 | mov byte ptr [edi], al // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 51 | push ecx // ff15???????? | // 8d842488030000 | lea eax, dword ptr [esp + 0x388] // 8bc8 | mov ecx, eax $sequence_17 = { 8b08 8d5101 8910 8819 8bc3 8b4c2444 64890d00000000 } // n = 7, score = 500 // 8b08 | mov ecx, dword ptr [eax] // 8d5101 | lea edx, dword ptr [ecx + 1] // 8910 | mov dword ptr [eax], edx // 8819 | mov byte ptr [ecx], bl // 8bc3 | mov eax, ebx // 8b4c2444 | mov ecx, dword ptr [esp + 0x44] // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_18 = { c1f805 8b0485e03b4100 83e61f c1e606 8d443004 8020fd 8b45f8 } // n = 7, score = 400 // c1f805 | sar eax, 5 // 8b0485e03b4100 | mov eax, dword ptr [eax*4 + 0x413be0] // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 // 8d443004 | lea eax, dword ptr [eax + esi + 4] // 8020fd | and byte ptr [eax], 0xfd // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_19 = { ffd6 85c0 75cc 5d 5b 8b442410 5f } // n = 7, 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] // 5f | pop edi $sequence_20 = { 68???????? 8d942474020000 e8???????? 8d842474020000 } // n = 4, score = 400 // 68???????? | // 8d942474020000 | lea edx, dword ptr [esp + 0x274] // e8???????? | // 8d842474020000 | lea eax, dword ptr [esp + 0x274] $sequence_21 = { 8b5618 51 52 50 ffd3 } // n = 5, score = 400 // 8b5618 | mov edx, dword ptr [esi + 0x18] // 51 | push ecx // 52 | push edx // 50 | push eax // ffd3 | call ebx $sequence_22 = { 53 8b1d???????? 55 8b2d???????? 8b442410 8d542410 52 } // n = 7, score = 200 // 53 | push ebx // 8b1d???????? | // 55 | push ebp // 8b2d???????? | // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8d542410 | lea edx, dword ptr [esp + 0x10] // 52 | push edx $sequence_23 = { 85ff 0f84bc000000 6a00 57 ff15???????? } // n = 5, score = 200 // 85ff | test edi, edi // 0f84bc000000 | je 0xc2 // 6a00 | push 0 // 57 | push edi // ff15???????? | condition: 7 of them and filesize < 811008 }
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