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rule win_zlob_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.zlob." 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.zlob" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 8b09 8344241424 891481 40 3b430c } // n = 5, score = 200 // 8b09 | mov ecx, dword ptr [ecx] // 8344241424 | add dword ptr [esp + 0x14], 0x24 // 891481 | mov dword ptr [ecx + eax*4], edx // 40 | inc eax // 3b430c | cmp eax, dword ptr [ebx + 0xc] $sequence_1 = { 7504 4f 4f 4b 4b 8b45ec 8d4801 } // n = 7, score = 200 // 7504 | jne 6 // 4f | dec edi // 4f | dec edi // 4b | dec ebx // 4b | dec ebx // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8d4801 | lea ecx, dword ptr [eax + 1] $sequence_2 = { ff750c ffd6 33c0 384514 6aff ff750c } // n = 6, score = 200 // ff750c | push dword ptr [ebp + 0xc] // ffd6 | call esi // 33c0 | xor eax, eax // 384514 | cmp byte ptr [ebp + 0x14], al // 6aff | push -1 // ff750c | push dword ptr [ebp + 0xc] $sequence_3 = { c685e8feffff6f c685e9feffff67 c685eafeffff6f c685ebfeffff6e 889decfeffff ff15???????? 3bc3 } // n = 7, score = 200 // c685e8feffff6f | mov byte ptr [ebp - 0x118], 0x6f // c685e9feffff67 | mov byte ptr [ebp - 0x117], 0x67 // c685eafeffff6f | mov byte ptr [ebp - 0x116], 0x6f // c685ebfeffff6e | mov byte ptr [ebp - 0x115], 0x6e // 889decfeffff | mov byte ptr [ebp - 0x114], bl // ff15???????? | // 3bc3 | cmp eax, ebx $sequence_4 = { 6a00 ff742418 ff7500 ff15???????? 8b4510 3b450c 8944241c } // n = 7, score = 200 // 6a00 | push 0 // ff742418 | push dword ptr [esp + 0x18] // ff7500 | push dword ptr [ebp] // ff15???????? | // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 3b450c | cmp eax, dword ptr [ebp + 0xc] // 8944241c | mov dword ptr [esp + 0x1c], eax $sequence_5 = { e8???????? 33d8 83c444 53 ff7508 83c708 } // n = 6, score = 200 // e8???????? | // 33d8 | xor ebx, eax // 83c444 | add esp, 0x44 // 53 | push ebx // ff7508 | push dword ptr [ebp + 8] // 83c708 | add edi, 8 $sequence_6 = { 50 e8???????? 8364242c00 85c0 59 89442430 0f8e60020000 } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8364242c00 | and dword ptr [esp + 0x2c], 0 // 85c0 | test eax, eax // 59 | pop ecx // 89442430 | mov dword ptr [esp + 0x30], eax // 0f8e60020000 | jle 0x266 $sequence_7 = { 8a45ff 5e 5b c9 c3 83ec0c 83242400 } // n = 7, score = 200 // 8a45ff | mov al, byte ptr [ebp - 1] // 5e | pop esi // 5b | pop ebx // c9 | leave // c3 | ret // 83ec0c | sub esp, 0xc // 83242400 | and dword ptr [esp], 0 $sequence_8 = { 6a01 68???????? 8bc8 e8???????? a3???????? } // n = 5, score = 200 // 6a01 | push 1 // 68???????? | // 8bc8 | mov ecx, eax // e8???????? | // a3???????? | $sequence_9 = { ffb42418010000 ff15???????? 50 68???????? } // n = 4, score = 200 // ffb42418010000 | push dword ptr [esp + 0x118] // ff15???????? | // 50 | push eax // 68???????? | condition: 7 of them and filesize < 98304 }
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