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rule win_urlzone_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.urlzone." 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.urlzone" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { eb10 80f861 7c11 80f866 7f0c 80e861 80c00a } // n = 7, score = 3000 // eb10 | jmp 0x12 // 80f861 | cmp al, 0x61 // 7c11 | jl 0x13 // 80f866 | cmp al, 0x66 // 7f0c | jg 0xe // 80e861 | sub al, 0x61 // 80c00a | add al, 0xa $sequence_1 = { 80fc39 7f05 80ec30 eb22 } // n = 4, score = 3000 // 80fc39 | cmp ah, 0x39 // 7f05 | jg 7 // 80ec30 | sub ah, 0x30 // eb22 | jmp 0x24 $sequence_2 = { 92 31c0 85d2 7428 31c9 8a0a } // n = 6, score = 3000 // 92 | xchg eax, edx // 31c0 | xor eax, eax // 85d2 | test edx, edx // 7428 | je 0x2a // 31c9 | xor ecx, ecx // 8a0a | mov cl, byte ptr [edx] $sequence_3 = { 80e861 80c00a c0e004 08e0 } // n = 4, score = 3000 // 80e861 | sub al, 0x61 // 80c00a | add al, 0xa // c0e004 | shl al, 4 // 08e0 | or al, ah $sequence_4 = { 92 31c0 85d2 7428 31c9 } // n = 5, score = 3000 // 92 | xchg eax, edx // 31c0 | xor eax, eax // 85d2 | test edx, edx // 7428 | je 0x2a // 31c9 | xor ecx, ecx $sequence_5 = { 9c 7405 80f92b 7503 8a0a } // n = 5, score = 3000 // 9c | pushfd // 7405 | je 7 // 80f92b | cmp cl, 0x2b // 7503 | jne 5 // 8a0a | mov cl, byte ptr [edx] $sequence_6 = { 7f3d 80ec61 80c40a 80f830 7c32 80f839 7f05 } // n = 7, score = 3000 // 7f3d | jg 0x3f // 80ec61 | sub ah, 0x61 // 80c40a | add ah, 0xa // 80f830 | cmp al, 0x30 // 7c32 | jl 0x34 // 80f839 | cmp al, 0x39 // 7f05 | jg 7 $sequence_7 = { 7f08 80ec41 80c40a eb10 80fc61 7c42 80f866 } // n = 7, score = 3000 // 7f08 | jg 0xa // 80ec41 | sub ah, 0x41 // 80c40a | add ah, 0xa // eb10 | jmp 0x12 // 80fc61 | cmp ah, 0x61 // 7c42 | jl 0x44 // 80f866 | cmp al, 0x66 $sequence_8 = { 80fc39 7f05 80ec30 eb22 80fc41 7c54 } // n = 6, score = 3000 // 80fc39 | cmp ah, 0x39 // 7f05 | jg 7 // 80ec30 | sub ah, 0x30 // eb22 | jmp 0x24 // 80fc41 | cmp ah, 0x41 // 7c54 | jl 0x56 $sequence_9 = { 80fc41 7c54 80fc46 7f08 80ec41 80c40a } // n = 6, score = 3000 // 80fc41 | cmp ah, 0x41 // 7c54 | jl 0x56 // 80fc46 | cmp ah, 0x46 // 7f08 | jg 0xa // 80ec41 | sub ah, 0x41 // 80c40a | add ah, 0xa condition: 7 of them and filesize < 704512 }
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