There is no description at this point.
rule win_classfon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.classfon." 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.classfon" 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 = { 85c0 7462 8b542408 8b8e00020000 8b44240c } // n = 5, score = 200 // 85c0 | test eax, eax // 7462 | je 0x64 // 8b542408 | mov edx, dword ptr [esp + 8] // 8b8e00020000 | mov ecx, dword ptr [esi + 0x200] // 8b44240c | mov eax, dword ptr [esp + 0xc] $sequence_1 = { 8b742418 83f8ff 898600020000 7508 5f 33c0 } // n = 6, score = 200 // 8b742418 | mov esi, dword ptr [esp + 0x18] // 83f8ff | cmp eax, -1 // 898600020000 | mov dword ptr [esi + 0x200], eax // 7508 | jne 0xa // 5f | pop edi // 33c0 | xor eax, eax $sequence_2 = { 50 ffd3 89be04020000 8b8600020000 3bc7 740e } // n = 6, score = 200 // 50 | push eax // ffd3 | call ebx // 89be04020000 | mov dword ptr [esi + 0x204], edi // 8b8600020000 | mov eax, dword ptr [esi + 0x200] // 3bc7 | cmp eax, edi // 740e | je 0x10 $sequence_3 = { 8b1d???????? a1???????? 50 57 ff15???????? } // n = 5, score = 200 // 8b1d???????? | // a1???????? | // 50 | push eax // 57 | push edi // ff15???????? | $sequence_4 = { 8d4c241c 8d542424 51 8b4c2414 8d442424 52 } // n = 6, score = 200 // 8d4c241c | lea ecx, [esp + 0x1c] // 8d542424 | lea edx, [esp + 0x24] // 51 | push ecx // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8d442424 | lea eax, [esp + 0x24] // 52 | push edx $sequence_5 = { 8d842430020000 50 ffd7 8d8c2430010000 51 ffd7 8b542424 } // n = 7, score = 200 // 8d842430020000 | lea eax, [esp + 0x230] // 50 | push eax // ffd7 | call edi // 8d8c2430010000 | lea ecx, [esp + 0x130] // 51 | push ecx // ffd7 | call edi // 8b542424 | mov edx, dword ptr [esp + 0x24] $sequence_6 = { 6a00 6a00 6a00 6802000004 6a00 899610020000 } // n = 6, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6802000004 | push 0x4000002 // 6a00 | push 0 // 899610020000 | mov dword ptr [esi + 0x210], edx $sequence_7 = { 68???????? 51 c744242802000000 c744242c2c010000 ff15???????? } // n = 5, score = 200 // 68???????? | // 51 | push ecx // c744242802000000 | mov dword ptr [esp + 0x28], 2 // c744242c2c010000 | mov dword ptr [esp + 0x2c], 0x12c // ff15???????? | $sequence_8 = { 50 ff15???????? 8bd8 83fbff 0f849c000000 8b470c 8b5708 } // n = 7, score = 200 // 50 | push eax // ff15???????? | // 8bd8 | mov ebx, eax // 83fbff | cmp ebx, -1 // 0f849c000000 | je 0xa2 // 8b470c | mov eax, dword ptr [edi + 0xc] // 8b5708 | mov edx, dword ptr [edi + 8] $sequence_9 = { 0f85c3000000 8b460c 85c0 0f84c0000000 03c5 } // n = 5, score = 200 // 0f85c3000000 | jne 0xc9 // 8b460c | mov eax, dword ptr [esi + 0xc] // 85c0 | test eax, eax // 0f84c0000000 | je 0xc6 // 03c5 | add eax, ebp condition: 7 of them and filesize < 73728 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY