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rule win_onhat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.onhat." 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.onhat" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 0f859e000000 b907000000 33c0 8dbc2495000000 c684249400000000 f3ab } // n = 7, score = 200 // 85c0 | test eax, eax // 0f859e000000 | jne 0xa4 // b907000000 | mov ecx, 7 // 33c0 | xor eax, eax // 8dbc2495000000 | lea edi, [esp + 0x95] // c684249400000000 | mov byte ptr [esp + 0x94], 0 // f3ab | rep stosd dword ptr es:[edi], eax $sequence_1 = { 50 e8???????? 8bbc244c010000 8bd8 57 895c241c } // n = 6, score = 200 // 50 | push eax // e8???????? | // 8bbc244c010000 | mov edi, dword ptr [esp + 0x14c] // 8bd8 | mov ebx, eax // 57 | push edi // 895c241c | mov dword ptr [esp + 0x1c], ebx $sequence_2 = { 56 ff15???????? 3d02010000 56 7422 ff15???????? 8b4c241c } // n = 7, score = 200 // 56 | push esi // ff15???????? | // 3d02010000 | cmp eax, 0x102 // 56 | push esi // 7422 | je 0x24 // ff15???????? | // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] $sequence_3 = { 83c408 e9???????? ff15???????? e9???????? 8b442414 81e6ffff0000 } // n = 6, score = 200 // 83c408 | add esp, 8 // e9???????? | // ff15???????? | // e9???????? | // 8b442414 | mov eax, dword ptr [esp + 0x14] // 81e6ffff0000 | and esi, 0xffff $sequence_4 = { 6a00 6a00 c644242000 88442427 32db 894c2430 } // n = 6, score = 200 // 6a00 | push 0 // 6a00 | push 0 // c644242000 | mov byte ptr [esp + 0x20], 0 // 88442427 | mov byte ptr [esp + 0x27], al // 32db | xor bl, bl // 894c2430 | mov dword ptr [esp + 0x30], ecx $sequence_5 = { c644242f00 aa ffd6 8b2d???????? 8d842494000000 50 ffd5 } // n = 7, score = 200 // c644242f00 | mov byte ptr [esp + 0x2f], 0 // aa | stosb byte ptr es:[edi], al // ffd6 | call esi // 8b2d???????? | // 8d842494000000 | lea eax, [esp + 0x94] // 50 | push eax // ffd5 | call ebp $sequence_6 = { 83c408 e9???????? ff15???????? e9???????? 68???????? eb05 68???????? } // n = 7, score = 200 // 83c408 | add esp, 8 // e9???????? | // ff15???????? | // e9???????? | // 68???????? | // eb05 | jmp 7 // 68???????? | $sequence_7 = { c3 5f 5e b804000080 5b 81c414110000 } // n = 6, score = 200 // c3 | ret // 5f | pop edi // 5e | pop esi // b804000080 | mov eax, 0x80000004 // 5b | pop ebx // 81c414110000 | add esp, 0x1114 $sequence_8 = { 51 52 885c2420 88442427 89742434 } // n = 5, score = 200 // 51 | push ecx // 52 | push edx // 885c2420 | mov byte ptr [esp + 0x20], bl // 88442427 | mov byte ptr [esp + 0x27], al // 89742434 | mov dword ptr [esp + 0x34], esi $sequence_9 = { ff15???????? 8bf0 3bf3 7526 68???????? e8???????? } // n = 6, score = 200 // ff15???????? | // 8bf0 | mov esi, eax // 3bf3 | cmp esi, ebx // 7526 | jne 0x28 // 68???????? | // e8???????? | condition: 7 of them and filesize < 57344 }
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