There is no description at this point.
rule win_polyglot_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.polyglot_ransom." 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.polyglot_ransom" 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 = { ff74244c e8???????? 8944241c 894c2448 6a07 895c2450 } // n = 6, score = 100 // ff74244c | push dword ptr [esp + 0x4c] // e8???????? | // 8944241c | mov dword ptr [esp + 0x1c], eax // 894c2448 | mov dword ptr [esp + 0x48], ecx // 6a07 | push 7 // 895c2450 | mov dword ptr [esp + 0x50], ebx $sequence_1 = { 6a30 e8???????? 59 59 8d4d80 51 6801010000 } // n = 7, score = 100 // 6a30 | push 0x30 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8d4d80 | lea ecx, [ebp - 0x80] // 51 | push ecx // 6801010000 | push 0x101 $sequence_2 = { ff5004 83c328 ff4d10 75ad ff75f0 ff15???????? } // n = 6, score = 100 // ff5004 | call dword ptr [eax + 4] // 83c328 | add ebx, 0x28 // ff4d10 | dec dword ptr [ebp + 0x10] // 75ad | jne 0xffffffaf // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | $sequence_3 = { be???????? 66f7c30040 6a04 5a 747a 6681fb0b40 756c } // n = 7, score = 100 // be???????? | // 66f7c30040 | test bx, 0x4000 // 6a04 | push 4 // 5a | pop edx // 747a | je 0x7c // 6681fb0b40 | cmp bx, 0x400b // 756c | jne 0x6e $sequence_4 = { 50 68???????? e8???????? 8b85f0fdffff 59 59 8b08 } // n = 7, score = 100 // 50 | push eax // 68???????? | // e8???????? | // 8b85f0fdffff | mov eax, dword ptr [ebp - 0x210] // 59 | pop ecx // 59 | pop ecx // 8b08 | mov ecx, dword ptr [eax] $sequence_5 = { 627265 206f20 656c 696d696e617220 61 7263 6869766f73 } // n = 7, score = 100 // 627265 | bound esi, qword ptr [edx + 0x65] // 206f20 | and byte ptr [edi + 0x20], ch // 656c | insb byte ptr es:[edi], dx // 696d696e617220 | imul ebp, dword ptr [ebp + 0x69], 0x2072616e // 61 | popal // 7263 | jb 0x65 // 6869766f73 | push 0x736f7669 $sequence_6 = { eb4f 8bf3 8bf9 a5 a5 a5 a5 } // n = 7, score = 100 // eb4f | jmp 0x51 // 8bf3 | mov esi, ebx // 8bf9 | mov edi, ecx // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_7 = { 59 59 751c 8b45fc 8b4020 85c0 } // n = 6, score = 100 // 59 | pop ecx // 59 | pop ecx // 751c | jne 0x1e // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4020 | mov eax, dword ptr [eax + 0x20] // 85c0 | test eax, eax $sequence_8 = { 5e c20400 68???????? 6a20 33c0 } // n = 5, score = 100 // 5e | pop esi // c20400 | ret 4 // 68???????? | // 6a20 | push 0x20 // 33c0 | xor eax, eax $sequence_9 = { 40 5e eb02 32c0 8b4d74 33cd } // n = 6, score = 100 // 40 | inc eax // 5e | pop esi // eb02 | jmp 4 // 32c0 | xor al, al // 8b4d74 | mov ecx, dword ptr [ebp + 0x74] // 33cd | xor ecx, ebp condition: 7 of them and filesize < 1392640 }
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