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rule win_jaff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 894704 8b4608 8d1400 52 6a08 894708 } // n = 6, score = 600 // 894704 | mov dword ptr [edi + 4], eax // 8b4608 | mov eax, dword ptr [esi + 8] // 8d1400 | lea edx, [eax + eax] // 52 | push edx // 6a08 | push 8 // 894708 | mov dword ptr [edi + 8], eax $sequence_1 = { 6a08 c745c800000000 897dcc c645d001 8945e4 ffd3 50 } // n = 7, score = 600 // 6a08 | push 8 // c745c800000000 | mov dword ptr [ebp - 0x38], 0 // 897dcc | mov dword ptr [ebp - 0x34], edi // c645d001 | mov byte ptr [ebp - 0x30], 1 // 8945e4 | mov dword ptr [ebp - 0x1c], eax // ffd3 | call ebx // 50 | push eax $sequence_2 = { 8a4d08 80e101 884dfc 8b55fc 52 8d45f0 50 } // n = 7, score = 600 // 8a4d08 | mov cl, byte ptr [ebp + 8] // 80e101 | and cl, 1 // 884dfc | mov byte ptr [ebp - 4], cl // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax $sequence_3 = { 7506 c6460c00 eb3f 3c30 7424 3c31 7420 } // n = 7, score = 600 // 7506 | jne 8 // c6460c00 | mov byte ptr [esi + 0xc], 0 // eb3f | jmp 0x41 // 3c30 | cmp al, 0x30 // 7424 | je 0x26 // 3c31 | cmp al, 0x31 // 7420 | je 0x22 $sequence_4 = { 8b550c 52 6a00 ffd3 50 ffd6 } // n = 6, score = 600 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 52 | push edx // 6a00 | push 0 // ffd3 | call ebx // 50 | push eax // ffd6 | call esi $sequence_5 = { 8b5590 52 6a00 ffd7 50 ffd6 53 } // n = 7, score = 600 // 8b5590 | mov edx, dword ptr [ebp - 0x70] // 52 | push edx // 6a00 | push 0 // ffd7 | call edi // 50 | push eax // ffd6 | call esi // 53 | push ebx $sequence_6 = { c6450b01 782a 8b55f8 8a0416 3c01 } // n = 5, score = 600 // c6450b01 | mov byte ptr [ebp + 0xb], 1 // 782a | js 0x2c // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8a0416 | mov al, byte ptr [esi + edx] // 3c01 | cmp al, 1 $sequence_7 = { 8945ec 895df8 3bf3 0f86da000000 8b45f0 } // n = 5, score = 600 // 8945ec | mov dword ptr [ebp - 0x14], eax // 895df8 | mov dword ptr [ebp - 8], ebx // 3bf3 | cmp esi, ebx // 0f86da000000 | jbe 0xe0 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_8 = { 8b7df8 8bc7 5f 895604 } // n = 4, score = 600 // 8b7df8 | mov edi, dword ptr [ebp - 8] // 8bc7 | mov eax, edi // 5f | pop edi // 895604 | mov dword ptr [esi + 4], edx $sequence_9 = { 75f9 2bc1 7444 8d642400 83fe0a 7438 8a8c3570fbffff } // n = 7, score = 600 // 75f9 | jne 0xfffffffb // 2bc1 | sub eax, ecx // 7444 | je 0x46 // 8d642400 | lea esp, [esp] // 83fe0a | cmp esi, 0xa // 7438 | je 0x3a // 8a8c3570fbffff | mov cl, byte ptr [ebp + esi - 0x490] condition: 7 of them and filesize < 106496 }
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