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rule win_fonix_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.fonix." 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.fonix" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 83611000 83611400 e8???????? 32d2 c645fc01 8bce e8???????? } // n = 7, score = 100 // 83611000 | and dword ptr [ecx + 0x10], 0 // 83611400 | and dword ptr [ecx + 0x14], 0 // e8???????? | // 32d2 | xor dl, dl // c645fc01 | mov byte ptr [ebp - 4], 1 // 8bce | mov ecx, esi // e8???????? | $sequence_1 = { 8bc7 83781410 7202 8b00 ff7710 8d4dd8 50 } // n = 7, score = 100 // 8bc7 | mov eax, edi // 83781410 | cmp dword ptr [eax + 0x14], 0x10 // 7202 | jb 4 // 8b00 | mov eax, dword ptr [eax] // ff7710 | push dword ptr [edi + 0x10] // 8d4dd8 | lea ecx, [ebp - 0x28] // 50 | push eax $sequence_2 = { 85ff 0f8586000000 6a3a 56 e8???????? 8bf8 59 } // n = 7, score = 100 // 85ff | test edi, edi // 0f8586000000 | jne 0x8c // 6a3a | push 0x3a // 56 | push esi // e8???????? | // 8bf8 | mov edi, eax // 59 | pop ecx $sequence_3 = { 56 8bcf c705????????38624900 e8???????? 68???????? e8???????? 59 } // n = 7, score = 100 // 56 | push esi // 8bcf | mov ecx, edi // c705????????38624900 | // e8???????? | // 68???????? | // e8???????? | // 59 | pop ecx $sequence_4 = { d1e8 394540 7710 6a01 8d4d38 e8???????? } // n = 6, score = 100 // d1e8 | shr eax, 1 // 394540 | cmp dword ptr [ebp + 0x40], eax // 7710 | ja 0x12 // 6a01 | push 1 // 8d4d38 | lea ecx, [ebp + 0x38] // e8???????? | $sequence_5 = { 75f8 85ff 0f8eac000000 c745e044ae4900 8955e4 8955e8 8d04bd04000000 } // n = 7, score = 100 // 75f8 | jne 0xfffffffa // 85ff | test edi, edi // 0f8eac000000 | jle 0xb2 // c745e044ae4900 | mov dword ptr [ebp - 0x20], 0x49ae44 // 8955e4 | mov dword ptr [ebp - 0x1c], edx // 8955e8 | mov dword ptr [ebp - 0x18], edx // 8d04bd04000000 | lea eax, [edi*4 + 4] $sequence_6 = { 7411 c74608???????? c7463c283c4900 894df0 8b4608 c74604???????? 8b4004 } // n = 7, score = 100 // 7411 | je 0x13 // c74608???????? | // c7463c283c4900 | mov dword ptr [esi + 0x3c], 0x493c28 // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b4608 | mov eax, dword ptr [esi + 8] // c74604???????? | // 8b4004 | mov eax, dword ptr [eax + 4] $sequence_7 = { e8???????? 50 8bcd e8???????? b301 84ff } // n = 6, score = 100 // e8???????? | // 50 | push eax // 8bcd | mov ecx, ebp // e8???????? | // b301 | mov bl, 1 // 84ff | test bh, bh $sequence_8 = { 8d8d20010000 e8???????? c78514010000d0554900 c78518010000fc554900 c7851c01000020564900 } // n = 5, score = 100 // 8d8d20010000 | lea ecx, [ebp + 0x120] // e8???????? | // c78514010000d0554900 | mov dword ptr [ebp + 0x114], 0x4955d0 // c78518010000fc554900 | mov dword ptr [ebp + 0x118], 0x4955fc // c7851c01000020564900 | mov dword ptr [ebp + 0x11c], 0x495620 $sequence_9 = { c645fc1b f3ab 85d2 7407 e8???????? eb05 e8???????? } // n = 7, score = 100 // c645fc1b | mov byte ptr [ebp - 4], 0x1b // f3ab | rep stosd dword ptr es:[edi], eax // 85d2 | test edx, edx // 7407 | je 9 // e8???????? | // eb05 | jmp 7 // e8???????? | condition: 7 of them and filesize < 2226176 }
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