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rule win_jaff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.jaff." 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.jaff" 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 = { ff15???????? 8906 33c0 394608 7619 8d9b00000000 8b55dc } // n = 7, score = 600 // ff15???????? | // 8906 | mov dword ptr [esi], eax // 33c0 | xor eax, eax // 394608 | cmp dword ptr [esi + 8], eax // 7619 | jbe 0x1b // 8d9b00000000 | lea ebx, [ebx] // 8b55dc | mov edx, dword ptr [ebp - 0x24] $sequence_1 = { 3b7a04 72e8 897dec 8945fc } // n = 4, score = 600 // 3b7a04 | cmp edi, dword ptr [edx + 4] // 72e8 | jb 0xffffffea // 897dec | mov dword ptr [ebp - 0x14], edi // 8945fc | mov dword ptr [ebp - 4], eax $sequence_2 = { 8b4d08 80790c00 740d 8b5510 807a0c00 7504 c645e800 } // n = 7, score = 600 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 80790c00 | cmp byte ptr [ecx + 0xc], 0 // 740d | je 0xf // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 807a0c00 | cmp byte ptr [edx + 0xc], 0 // 7504 | jne 6 // c645e800 | mov byte ptr [ebp - 0x18], 0 $sequence_3 = { 8b45dc 66891448 41 3b4df8 76a8 } // n = 5, score = 600 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 66891448 | mov word ptr [eax + ecx*2], dx // 41 | inc ecx // 3b4df8 | cmp ecx, dword ptr [ebp - 8] // 76a8 | jbe 0xffffffaa $sequence_4 = { 8b5708 8b1e 668b1c4b 66891c48 41 3bca 72f1 } // n = 7, score = 600 // 8b5708 | mov edx, dword ptr [edi + 8] // 8b1e | mov ebx, dword ptr [esi] // 668b1c4b | mov bx, word ptr [ebx + ecx*2] // 66891c48 | mov word ptr [eax + ecx*2], bx // 41 | inc ecx // 3bca | cmp ecx, edx // 72f1 | jb 0xfffffff3 $sequence_5 = { 56 57 8b3d???????? 6a14 6a08 c745ec0a000000 } // n = 6, score = 600 // 56 | push esi // 57 | push edi // 8b3d???????? | // 6a14 | push 0x14 // 6a08 | push 8 // c745ec0a000000 | mov dword ptr [ebp - 0x14], 0xa $sequence_6 = { 5e 33c0 5b 8be5 5d c20800 8bd1 } // n = 7, score = 600 // 5e | pop esi // 33c0 | xor eax, eax // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 8bd1 | mov edx, ecx $sequence_7 = { ff15???????? 50 ff15???????? 33c9 394e04 7610 8b16 } // n = 7, score = 600 // ff15???????? | // 50 | push eax // ff15???????? | // 33c9 | xor ecx, ecx // 394e04 | cmp dword ptr [esi + 4], ecx // 7610 | jbe 0x12 // 8b16 | mov edx, dword ptr [esi] $sequence_8 = { 8b4ddc 8b3d???????? 51 6a00 ffd7 50 ffd3 } // n = 7, score = 600 // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 8b3d???????? | // 51 | push ecx // 6a00 | push 0 // ffd7 | call edi // 50 | push eax // ffd3 | call ebx $sequence_9 = { 57 8bf0 6a14 6a08 c7460400000000 c746080a000000 c6460c01 } // n = 7, score = 600 // 57 | push edi // 8bf0 | mov esi, eax // 6a14 | push 0x14 // 6a08 | push 8 // c7460400000000 | mov dword ptr [esi + 4], 0 // c746080a000000 | mov dword ptr [esi + 8], 0xa // c6460c01 | mov byte ptr [esi + 0xc], 1 condition: 7 of them and filesize < 106496 }
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