Actor(s): Lunar Spider
There is no description at this point.
rule win_vawtrak_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.vawtrak" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 6a01 ff35???????? 6a04 6a01 50 ff15???????? 85c0 } // n = 7, score = 2600 // 6a01 | push 1 // ff35???????? | // 6a04 | push 4 // 6a01 | push 1 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax $sequence_1 = { 6a00 6a00 e8???????? 50 ff15???????? } // n = 5, score = 2600 // 6a00 | push 0 // 6a00 | push 0 // e8???????? | // 50 | push eax // ff15???????? | $sequence_2 = { ba00ff0000 8bc1 23c2 3bc2 } // n = 4, score = 2400 // ba00ff0000 | mov edx, 0xff00 // 8bc1 | mov eax, ecx // 23c2 | and eax, edx // 3bc2 | cmp eax, edx $sequence_3 = { 85c0 7421 8b4d08 e8???????? 85c0 7415 } // n = 6, score = 2400 // 85c0 | test eax, eax // 7421 | je 0x23 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // e8???????? | // 85c0 | test eax, eax // 7415 | je 0x17 $sequence_4 = { 870b 5f 8bc6 5e 5b c3 } // n = 6, score = 2400 // 870b | xchg dword ptr [ebx], ecx // 5f | pop edi // 8bc6 | mov eax, esi // 5e | pop esi // 5b | pop ebx // c3 | ret $sequence_5 = { 56 be???????? 33c0 40 8706 } // n = 5, score = 2400 // 56 | push esi // be???????? | // 33c0 | xor eax, eax // 40 | inc eax // 8706 | xchg dword ptr [esi], eax $sequence_6 = { ffd7 33f6 46 eb02 33f6 } // n = 5, score = 2400 // ffd7 | call edi // 33f6 | xor esi, esi // 46 | inc esi // eb02 | jmp 4 // 33f6 | xor esi, esi $sequence_7 = { 0fb68f97010000 0fb68796010000 0fb6b795010000 03c1 03f0 } // n = 5, score = 2400 // 0fb68f97010000 | movzx ecx, byte ptr [edi + 0x197] // 0fb68796010000 | movzx eax, byte ptr [edi + 0x196] // 0fb6b795010000 | movzx esi, byte ptr [edi + 0x195] // 03c1 | add eax, ecx // 03f0 | add esi, eax $sequence_8 = { 7515 2105???????? c705????????04000000 e9???????? } // n = 4, score = 2200 // 7515 | jne 0x17 // 2105???????? | // c705????????04000000 | // e9???????? | $sequence_9 = { 0fb6c9 81c900ff0000 e8???????? 85c0 } // n = 4, score = 2200 // 0fb6c9 | movzx ecx, cl // 81c900ff0000 | or ecx, 0xff00 // e8???????? | // 85c0 | test eax, eax $sequence_10 = { a804 7405 e8???????? 803d????????00 7405 e8???????? } // n = 6, score = 2200 // a804 | test al, 4 // 7405 | je 7 // e8???????? | // 803d????????00 | // 7405 | je 7 // e8???????? | $sequence_11 = { 85c0 7516 c705????????02000000 c705????????01000000 } // n = 4, score = 2200 // 85c0 | test eax, eax // 7516 | jne 0x18 // c705????????02000000 | // c705????????01000000 | $sequence_12 = { 7516 c705????????02000000 c705????????03000000 eb14 } // n = 4, score = 2200 // 7516 | jne 0x18 // c705????????02000000 | // c705????????03000000 | // eb14 | jmp 0x16 $sequence_13 = { 750f 33c9 e8???????? 85c0 7404 } // n = 5, score = 2200 // 750f | jne 0x11 // 33c9 | xor ecx, ecx // e8???????? | // 85c0 | test eax, eax // 7404 | je 6 $sequence_14 = { b8ff0f0000 6623e8 b800400000 660be8 } // n = 4, score = 2200 // b8ff0f0000 | mov eax, 0xfff // 6623e8 | and bp, ax // b800400000 | mov eax, 0x4000 // 660be8 | or bp, ax $sequence_15 = { 7528 68???????? ff15???????? 85c0 7504 } // n = 5, score = 2000 // 7528 | jne 0x2a // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7504 | jne 6 $sequence_16 = { 6a08 68???????? 56 ffd7 85c0 } // n = 5, score = 2000 // 6a08 | push 8 // 68???????? | // 56 | push esi // ffd7 | call edi // 85c0 | test eax, eax $sequence_17 = { 50 ff15???????? a3???????? 85c0 74e7 } // n = 5, score = 2000 // 50 | push eax // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 74e7 | je 0xffffffe9 $sequence_18 = { 8bc6 8703 3bc6 74f8 } // n = 4, score = 1900 // 8bc6 | mov eax, esi // 8703 | xchg dword ptr [ebx], eax // 3bc6 | cmp eax, esi // 74f8 | je 0xfffffffa $sequence_19 = { 59 57 8bf0 ff15???????? 8bc6 } // n = 5, score = 1900 // 59 | pop ecx // 57 | push edi // 8bf0 | mov esi, eax // ff15???????? | // 8bc6 | mov eax, esi $sequence_20 = { e8???????? 33d2 b9ff3f0000 f7f1 } // n = 4, score = 1900 // e8???????? | // 33d2 | xor edx, edx // b9ff3f0000 | mov ecx, 0x3fff // f7f1 | div ecx $sequence_21 = { 7705 80ea61 eb0a 8d42bf 3c0f } // n = 5, score = 1700 // 7705 | ja 7 // 80ea61 | sub dl, 0x61 // eb0a | jmp 0xc // 8d42bf | lea eax, [edx - 0x41] // 3c0f | cmp al, 0xf $sequence_22 = { 56 6a04 53 57 } // n = 4, score = 1700 // 56 | push esi // 6a04 | push 4 // 53 | push ebx // 57 | push edi $sequence_23 = { eb04 8b01 8907 e8???????? } // n = 4, score = 1700 // eb04 | jmp 6 // 8b01 | mov eax, dword ptr [ecx] // 8907 | mov dword ptr [edi], eax // e8???????? | $sequence_24 = { 8d429f 3c0f 7705 80ea61 } // n = 4, score = 1700 // 8d429f | lea eax, [edx - 0x61] // 3c0f | cmp al, 0xf // 7705 | ja 7 // 80ea61 | sub dl, 0x61 $sequence_25 = { 85c0 7504 33c0 eb52 e8???????? } // n = 5, score = 1200 // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax // eb52 | jmp 0x54 // e8???????? | $sequence_26 = { c1e910 e9???????? 8ac1 c1e904 c0e004 } // n = 5, score = 1200 // c1e910 | shr ecx, 0x10 // e9???????? | // 8ac1 | mov al, cl // c1e904 | shr ecx, 4 // c0e004 | shl al, 4 $sequence_27 = { ff15???????? 85c0 7904 33c0 eb1e } // n = 5, score = 1200 // ff15???????? | // 85c0 | test eax, eax // 7904 | jns 6 // 33c0 | xor eax, eax // eb1e | jmp 0x20 $sequence_28 = { 8ac8 240f 80e1f0 80c110 } // n = 4, score = 900 // 8ac8 | mov cl, al // 240f | and al, 0xf // 80e1f0 | and cl, 0xf0 // 80c110 | add cl, 0x10 $sequence_29 = { 3c41 7c11 3c46 7f0d } // n = 4, score = 800 // 3c41 | cmp al, 0x41 // 7c11 | jl 0x13 // 3c46 | cmp al, 0x46 // 7f0d | jg 0xf $sequence_30 = { 488bc8 ba28000000 ff15???????? 85c0 7456 4c8d442434 } // n = 6, score = 700 // 488bc8 | jmp 0x10 // ba28000000 | dec eax // ff15???????? | // 85c0 | mov ecx, eax // 7456 | mov edx, 0x28 // 4c8d442434 | test eax, eax $sequence_31 = { 33db 458bc9 498943d8 49895be8 ff15???????? } // n = 5, score = 700 // 33db | dec eax // 458bc9 | mov ecx, eax // 498943d8 | dec eax // 49895be8 | mov ebx, dword ptr [esp + 0x50] // ff15???????? | $sequence_32 = { 488bc8 e8???????? 488b5c2450 4883c440 } // n = 4, score = 700 // 488bc8 | je 0x5a // e8???????? | // 488b5c2450 | dec esp // 4883c440 | lea eax, [esp + 0x34] $sequence_33 = { ff15???????? 4883f8ff 7504 33c0 eb0e } // n = 5, score = 700 // ff15???????? | // 4883f8ff | dec eax // 7504 | cmp eax, -1 // 33c0 | jne 6 // eb0e | xor eax, eax condition: 7 of them and filesize < 1027072 }
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