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 = "2023-12-06" version = "1" description = "Detects win.vawtrak." 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.vawtrak" 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 = { 6a01 ff35???????? 6a04 6a01 50 ff15???????? 85c0 } // n = 7, score = 2700 // 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 = { 837d1040 752d 8b4d04 e8???????? 85c0 } // n = 5, score = 2400 // 837d1040 | push 1 // 752d | push 4 // 8b4d04 | push 1 // e8???????? | // 85c0 | push eax $sequence_3 = { 8b4d08 e8???????? 85c0 7415 ff15???????? 50 } // n = 6, score = 2400 // 8b4d08 | push 1 // e8???????? | // 85c0 | push 4 // 7415 | push 1 // ff15???????? | // 50 | push 1 $sequence_4 = { ba00ff0000 8bc1 23c2 3bc2 } // n = 4, score = 2400 // ba00ff0000 | push 1 // 8bc1 | push eax // 23c2 | push eax // 3bc2 | push 0 $sequence_5 = { 750f 33c9 e8???????? 85c0 7404 } // n = 5, score = 2200 // 750f | push 0 // 33c9 | push 0 // e8???????? | // 85c0 | push eax // 7404 | push eax $sequence_6 = { b8ff0f0000 6623e8 b800400000 660be8 } // n = 4, score = 2200 // b8ff0f0000 | push 0 // 6623e8 | push 0 // b800400000 | push eax // 660be8 | jmp 3 $sequence_7 = { 6a08 68???????? 56 ffd7 85c0 } // n = 5, score = 2100 // 6a08 | push 8 // 68???????? | // 56 | push esi // ffd7 | call edi // 85c0 | test eax, eax $sequence_8 = { 50 ff15???????? a3???????? 85c0 74e7 } // n = 5, score = 2100 // 50 | push eax // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 74e7 | je 0xffffffe9 $sequence_9 = { 7528 68???????? ff15???????? 85c0 7504 33c0 } // n = 6, score = 2100 // 7528 | jne 0x2a // 68???????? | // ff15???????? | // 85c0 | test eax, eax // 7504 | jne 6 // 33c0 | xor eax, eax $sequence_10 = { 59 57 8bf0 ff15???????? 8bc6 } // n = 5, score = 2000 // 59 | pop ecx // 57 | push edi // 8bf0 | mov esi, eax // ff15???????? | // 8bc6 | mov eax, esi $sequence_11 = { e8???????? 33d2 b9ff3f0000 f7f1 } // n = 4, score = 2000 // e8???????? | // 33d2 | xor edx, edx // b9ff3f0000 | mov ecx, 0x3fff // f7f1 | div ecx $sequence_12 = { 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_13 = { 56 6a04 53 57 } // n = 4, score = 1800 // 56 | push esi // 6a04 | push 4 // 53 | push ebx // 57 | push edi $sequence_14 = { 7705 80ea61 eb0a 8d42bf } // n = 4, score = 1700 // 7705 | push eax // 80ea61 | push 2 // eb0a | pop ecx // 8d42bf | test eax, eax $sequence_15 = { 03c1 8b4d14 8901 33c0 40 } // n = 5, score = 1600 // 03c1 | test eax, eax // 8b4d14 | jne 0xa // 8901 | xor eax, eax // 33c0 | pop ecx // 40 | push edi $sequence_16 = { e9???????? 8ac1 c1e904 c0e004 } // n = 4, score = 1200 // e9???????? | // 8ac1 | mov al, cl // c1e904 | shr ecx, 4 // c0e004 | shl al, 4 $sequence_17 = { 8ac8 240f 80e1f0 80c110 32c8 } // n = 5, score = 900 // 8ac8 | mov cl, al // 240f | and al, 0xf // 80e1f0 | and cl, 0xf0 // 80c110 | add cl, 0x10 // 32c8 | xor cl, al $sequence_18 = { 3c41 7c11 3c46 7f0d } // n = 4, score = 800 // 3c41 | cmp al, 0x41 // 7c11 | jl 0x13 // 3c46 | cmp al, 0x46 // 7f0d | jg 0xf $sequence_19 = { 48397c2430 7505 bb01000000 8bc3 } // n = 4, score = 700 // 48397c2430 | mov ecx, dword ptr [ebx] // 7505 | xor edi, edi // bb01000000 | cmp eax, 0xb7 // 8bc3 | mov edx, 0xf001f $sequence_20 = { 4885c0 7440 ff15???????? 488b0b 33ff 3db7000000 } // n = 6, score = 700 // 4885c0 | dec eax // 7440 | test eax, eax // ff15???????? | // 488b0b | je 0x42 // 33ff | dec eax // 3db7000000 | mov ecx, dword ptr [ebx] $sequence_21 = { 0f84ff000000 3d00010000 7320 488b0b } // n = 4, score = 700 // 0f84ff000000 | inc ecx // 3d00010000 | inc edx // 7320 | mov byte ptr [eax + ecx], dl // 488b0b | test esi, esi $sequence_22 = { 420fb61408 8bc1 ffc1 42881408 } // n = 4, score = 700 // 420fb61408 | dec eax // 8bc1 | cmp dword ptr [esp + 0x30], edi // ffc1 | jne 7 // 42881408 | mov ebx, 1 condition: 7 of them and filesize < 1027072 }
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