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rule win_artra_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { 5b 8b442410 5f 5e 83c41c c21000 5f } // n = 7, score = 800 // 5b | pop ebx // 8b442410 | mov eax, dword ptr [esp + 0x10] // 5f | pop edi // 5e | pop esi // 83c41c | add esp, 0x1c // c21000 | ret 0x10 // 5f | pop edi $sequence_1 = { 8bc6 57 33c9 8d7801 8da42400000000 8a10 } // n = 6, score = 700 // 8bc6 | mov eax, esi // 57 | push edi // 33c9 | xor ecx, ecx // 8d7801 | lea edi, [eax + 1] // 8da42400000000 | lea esp, [esp] // 8a10 | mov dl, byte ptr [eax] $sequence_2 = { 84d2 75f9 2bc7 3bc8 72e3 8bc6 8d5001 } // n = 7, score = 700 // 84d2 | test dl, dl // 75f9 | jne 0xfffffffb // 2bc7 | sub eax, edi // 3bc8 | cmp ecx, eax // 72e3 | jb 0xffffffe5 // 8bc6 | mov eax, esi // 8d5001 | lea edx, [eax + 1] $sequence_3 = { 800431f3 8bc6 41 8d7801 8d9b00000000 8a10 } // n = 6, score = 700 // 800431f3 | add byte ptr [ecx + esi], 0xf3 // 8bc6 | mov eax, esi // 41 | inc ecx // 8d7801 | lea edi, [eax + 1] // 8d9b00000000 | lea ebx, [ebx] // 8a10 | mov dl, byte ptr [eax] $sequence_4 = { 72e3 8bc6 8d5001 5f 8a08 40 84c9 } // n = 7, score = 700 // 72e3 | jb 0xffffffe5 // 8bc6 | mov eax, esi // 8d5001 | lea edx, [eax + 1] // 5f | pop edi // 8a08 | mov cl, byte ptr [eax] // 40 | inc eax // 84c9 | test cl, cl $sequence_5 = { 2bc2 03fb 8a4f01 47 84c9 } // n = 5, score = 600 // 2bc2 | sub eax, edx // 03fb | add edi, ebx // 8a4f01 | mov cl, byte ptr [edi + 1] // 47 | inc edi // 84c9 | test cl, cl $sequence_6 = { 50 ffd7 85c0 7445 53 8b1d???????? 55 } // n = 7, score = 600 // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax // 7445 | je 0x47 // 53 | push ebx // 8b1d???????? | // 55 | push ebp $sequence_7 = { 8bf8 85ff 0f8488000000 6a00 57 ff15???????? } // n = 6, score = 600 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f8488000000 | je 0x8e // 6a00 | push 0 // 57 | push edi // ff15???????? | $sequence_8 = { 8935???????? ff15???????? 8bf8 85ff 0f8488000000 } // n = 5, score = 600 // 8935???????? | // ff15???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f8488000000 | je 0x8e $sequence_9 = { 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_10 = { 8b1d???????? 55 8b2d???????? 90 } // n = 4, score = 600 // 8b1d???????? | // 55 | push ebp // 8b2d???????? | // 90 | nop $sequence_11 = { 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_12 = { 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_13 = { ff15???????? 57 ff15???????? 6a6d 56 ff15???????? 8bf0 } // n = 7, score = 600 // ff15???????? | // 57 | push edi // ff15???????? | // 6a6d | push 0x6d // 56 | push esi // ff15???????? | // 8bf0 | mov esi, eax $sequence_14 = { 83f910 7304 8d542418 8b5c2428 03d3 } // n = 5, score = 500 // 83f910 | cmp ecx, 0x10 // 7304 | jae 6 // 8d542418 | lea edx, [esp + 0x18] // 8b5c2428 | mov ebx, dword ptr [esp + 0x28] // 03d3 | add edx, ebx $sequence_15 = { 8d45dc 50 c745fcffffffff e8???????? 8b4df4 } // n = 5, score = 500 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_16 = { c644242664 c644242877 c644242a20 c644242b4e c644242c54 c644242d5c } // n = 6, score = 500 // c644242664 | mov byte ptr [esp + 0x26], 0x64 // c644242877 | mov byte ptr [esp + 0x28], 0x77 // c644242a20 | mov byte ptr [esp + 0x2a], 0x20 // c644242b4e | mov byte ptr [esp + 0x2b], 0x4e // c644242c54 | mov byte ptr [esp + 0x2c], 0x54 // c644242d5c | mov byte ptr [esp + 0x2d], 0x5c $sequence_17 = { 0f84e7000000 55 33c9 8d742434 e8???????? 8b4c245c 6aff } // n = 7, score = 500 // 0f84e7000000 | je 0xed // 55 | push ebp // 33c9 | xor ecx, ecx // 8d742434 | lea esi, [esp + 0x34] // e8???????? | // 8b4c245c | mov ecx, dword ptr [esp + 0x5c] // 6aff | push -1 $sequence_18 = { c1f905 8b0c8de03b4100 83e01f c1e006 } // n = 4, score = 400 // c1f905 | sar ecx, 5 // 8b0c8de03b4100 | mov ecx, dword ptr [ecx*4 + 0x413be0] // 83e01f | and eax, 0x1f // c1e006 | shl eax, 6 $sequence_19 = { e8???????? 8b4c241c 51 6a01 8d542428 6a01 52 } // n = 7, score = 400 // e8???????? | // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 51 | push ecx // 6a01 | push 1 // 8d542428 | lea edx, [esp + 0x28] // 6a01 | push 1 // 52 | push edx $sequence_20 = { ffd6 85c0 75cc 5d 5b } // n = 5, score = 400 // ffd6 | call esi // 85c0 | test eax, eax // 75cc | jne 0xffffffce // 5d | pop ebp // 5b | pop ebx $sequence_21 = { 0fb60d???????? fec9 8808 0fb615???????? } // n = 4, score = 400 // 0fb60d???????? | // fec9 | dec cl // 8808 | mov byte ptr [eax], cl // 0fb615???????? | $sequence_22 = { 751e a1???????? 50 ff15???????? 8b761c } // n = 5, score = 400 // 751e | jne 0x20 // a1???????? | // 50 | push eax // ff15???????? | // 8b761c | mov esi, dword ptr [esi + 0x1c] $sequence_23 = { 52 57 50 ffd3 85c0 7512 } // n = 6, score = 200 // 52 | push edx // 57 | push edi // 50 | push eax // ffd3 | call ebx // 85c0 | test eax, eax // 7512 | jne 0x14 $sequence_24 = { 6a6c 50 c744242c06000000 c74424306d000000 c744243478364000 } // n = 5, score = 200 // 6a6c | push 0x6c // 50 | push eax // c744242c06000000 | mov dword ptr [esp + 0x2c], 6 // c74424306d000000 | mov dword ptr [esp + 0x30], 0x6d // c744243478364000 | mov dword ptr [esp + 0x34], 0x403678 $sequence_25 = { 84c9 75f9 2bc2 880c30 59 c3 3b0d???????? } // n = 7, score = 200 // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // 880c30 | mov byte ptr [eax + esi], cl // 59 | pop ecx // c3 | ret // 3b0d???????? | condition: 7 of them and filesize < 811008 }
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