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rule win_malumpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.malumpos." 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.malumpos" 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 = { 85f6 7907 0d80000000 eb27 } // n = 4, score = 100 // 85f6 | test esi, esi // 7907 | jns 9 // 0d80000000 | or eax, 0x80 // eb27 | jmp 0x29 $sequence_1 = { 53 50 c78500fdffff07000100 895d4c 895dcc e8???????? } // n = 6, score = 100 // 53 | push ebx // 50 | push eax // c78500fdffff07000100 | mov dword ptr [ebp - 0x300], 0x10007 // 895d4c | mov dword ptr [ebp + 0x4c], ebx // 895dcc | mov dword ptr [ebp - 0x34], ebx // e8???????? | $sequence_2 = { 59 8d45cc 50 ff15???????? 6a44 } // n = 5, score = 100 // 59 | pop ecx // 8d45cc | lea eax, [ebp - 0x34] // 50 | push eax // ff15???????? | // 6a44 | push 0x44 $sequence_3 = { 0f1f00 0f1f00 0f1f00 0f1f00 6a72 } // n = 5, score = 100 // 0f1f00 | nop dword ptr [eax] // 0f1f00 | nop dword ptr [eax] // 0f1f00 | nop dword ptr [eax] // 0f1f00 | nop dword ptr [eax] // 6a72 | push 0x72 $sequence_4 = { 3bc8 0f86f1feffff ff770c 50 e8???????? } // n = 5, score = 100 // 3bc8 | cmp ecx, eax // 0f86f1feffff | jbe 0xfffffef7 // ff770c | push dword ptr [edi + 0xc] // 50 | push eax // e8???????? | $sequence_5 = { 7805 0500000000 57 3500000000 } // n = 4, score = 100 // 7805 | js 7 // 0500000000 | add eax, 0 // 57 | push edi // 3500000000 | xor eax, 0 $sequence_6 = { 8a0432 3c3d 7506 8365fc00 eb0d } // n = 5, score = 100 // 8a0432 | mov al, byte ptr [edx + esi] // 3c3d | cmp al, 0x3d // 7506 | jne 8 // 8365fc00 | and dword ptr [ebp - 4], 0 // eb0d | jmp 0xf $sequence_7 = { e8???????? 68???????? a3???????? ffd0 810d????????00200000 be???????? c745f468e50300 } // n = 7, score = 100 // e8???????? | // 68???????? | // a3???????? | // ffd0 | call eax // 810d????????00200000 | // be???????? | // c745f468e50300 | mov dword ptr [ebp - 0xc], 0x3e568 $sequence_8 = { 6683f300 55 51 7204 } // n = 4, score = 100 // 6683f300 | xor bx, 0 // 55 | push ebp // 51 | push ecx // 7204 | jb 6 $sequence_9 = { 8d4520 50 ff15???????? 8d4520 } // n = 4, score = 100 // 8d4520 | lea eax, [ebp + 0x20] // 50 | push eax // ff15???????? | // 8d4520 | lea eax, [ebp + 0x20] condition: 7 of them and filesize < 542720 }
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