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rule win_sobig_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.sobig." 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.sobig" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { e8???????? 6a01 8d4db8 e8???????? 83c8ff e9???????? 6a30 } // n = 7, score = 100 // e8???????? | // 6a01 | push 1 // 8d4db8 | lea ecx, [ebp - 0x48] // e8???????? | // 83c8ff | or eax, 0xffffffff // e9???????? | // 6a30 | push 0x30 $sequence_1 = { ff750c 8d4dbc e8???????? 6a01 8d7e20 5b } // n = 6, score = 100 // ff750c | push dword ptr [ebp + 0xc] // 8d4dbc | lea ecx, [ebp - 0x44] // e8???????? | // 6a01 | push 1 // 8d7e20 | lea edi, [esi + 0x20] // 5b | pop ebx $sequence_2 = { 83650800 c7451008000000 0fb6450f 32d2 } // n = 4, score = 100 // 83650800 | and dword ptr [ebp + 8], 0 // c7451008000000 | mov dword ptr [ebp + 0x10], 8 // 0fb6450f | movzx eax, byte ptr [ebp + 0xf] // 32d2 | xor dl, dl $sequence_3 = { e8???????? 8bf8 ff7614 8d4d90 c645fc04 e8???????? } // n = 6, score = 100 // e8???????? | // 8bf8 | mov edi, eax // ff7614 | push dword ptr [esi + 0x14] // 8d4d90 | lea ecx, [ebp - 0x70] // c645fc04 | mov byte ptr [ebp - 4], 4 // e8???????? | $sequence_4 = { 5e 8a1408 80faff 8811 7401 47 } // n = 6, score = 100 // 5e | pop esi // 8a1408 | mov dl, byte ptr [eax + ecx] // 80faff | cmp dl, 0xff // 8811 | mov byte ptr [ecx], dl // 7401 | je 3 // 47 | inc edi $sequence_5 = { 8b4630 6a01 8985e4feffff 58 53 8d8de0feffff 53 } // n = 7, score = 100 // 8b4630 | mov eax, dword ptr [esi + 0x30] // 6a01 | push 1 // 8985e4feffff | mov dword ptr [ebp - 0x11c], eax // 58 | pop eax // 53 | push ebx // 8d8de0feffff | lea ecx, [ebp - 0x120] // 53 | push ebx $sequence_6 = { 8d45bc 50 8bcf 895dfc e8???????? 83780800 0f94c0 } // n = 7, score = 100 // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // 8bcf | mov ecx, edi // 895dfc | mov dword ptr [ebp - 4], ebx // e8???????? | // 83780800 | cmp dword ptr [eax + 8], 0 // 0f94c0 | sete al $sequence_7 = { 3bc8 0f8496000000 8bd9 8d4de8 } // n = 4, score = 100 // 3bc8 | cmp ecx, eax // 0f8496000000 | je 0x9c // 8bd9 | mov ebx, ecx // 8d4de8 | lea ecx, [ebp - 0x18] $sequence_8 = { 68???????? 6801000080 8d4d08 e8???????? 8b45ec c7451094624100 } // n = 6, score = 100 // 68???????? | // 6801000080 | push 0x80000001 // 8d4d08 | lea ecx, [ebp + 8] // e8???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // c7451094624100 | mov dword ptr [ebp + 0x10], 0x416294 $sequence_9 = { 8a1f 47 83f80b 0f8777020000 ff2485563b4100 } // n = 5, score = 100 // 8a1f | mov bl, byte ptr [edi] // 47 | inc edi // 83f80b | cmp eax, 0xb // 0f8777020000 | ja 0x27d // ff2485563b4100 | jmp dword ptr [eax*4 + 0x413b56] condition: 7 of them and filesize < 262144 }
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