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rule win_sobig_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 50 c645fc02 e8???????? 59 c645fc01 59 6a01 } // n = 7, score = 100 // 50 | push eax // c645fc02 | mov byte ptr [ebp - 4], 2 // e8???????? | // 59 | pop ecx // c645fc01 | mov byte ptr [ebp - 4], 1 // 59 | pop ecx // 6a01 | push 1 $sequence_1 = { 50 8d8560fbffff 50 e8???????? 395e78 0f8494000000 } // n = 6, score = 100 // 50 | push eax // 8d8560fbffff | lea eax, [ebp - 0x4a0] // 50 | push eax // e8???????? | // 395e78 | cmp dword ptr [esi + 0x78], ebx // 0f8494000000 | je 0x9a $sequence_2 = { 8a4801 c0e102 884e02 8a5002 } // n = 4, score = 100 // 8a4801 | mov cl, byte ptr [eax + 1] // c0e102 | shl cl, 2 // 884e02 | mov byte ptr [esi + 2], cl // 8a5002 | mov dl, byte ptr [eax + 2] $sequence_3 = { ff7510 53 57 e8???????? 83c40c 85c0 7408 } // n = 7, score = 100 // ff7510 | push dword ptr [ebp + 0x10] // 53 | push ebx // 57 | push edi // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7408 | je 0xa $sequence_4 = { c645fc01 e8???????? ff30 8d45e8 8d4e14 50 e8???????? } // n = 7, score = 100 // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // ff30 | push dword ptr [eax] // 8d45e8 | lea eax, [ebp - 0x18] // 8d4e14 | lea ecx, [esi + 0x14] // 50 | push eax // e8???????? | $sequence_5 = { 50 ff15???????? 8d8560fbffff 50 e8???????? 83c410 8d4dc8 } // n = 7, score = 100 // 50 | push eax // ff15???????? | // 8d8560fbffff | lea eax, [ebp - 0x4a0] // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 // 8d4dc8 | lea ecx, [ebp - 0x38] $sequence_6 = { 8d4de4 e8???????? e9???????? 8b4004 53 57 3bc6 } // n = 7, score = 100 // 8d4de4 | lea ecx, [ebp - 0x1c] // e8???????? | // e9???????? | // 8b4004 | mov eax, dword ptr [eax + 4] // 53 | push ebx // 57 | push edi // 3bc6 | cmp eax, esi $sequence_7 = { 59 753a 8b45ec 3bc6 7505 b8???????? 56 } // n = 7, score = 100 // 59 | pop ecx // 753a | jne 0x3c // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 3bc6 | cmp eax, esi // 7505 | jne 7 // b8???????? | // 56 | push esi $sequence_8 = { 5f 64890d00000000 c9 c20800 8b44240c 56 57 } // n = 7, score = 100 // 5f | pop edi // 64890d00000000 | mov dword ptr fs:[0], ecx // c9 | leave // c20800 | ret 8 // 8b44240c | mov eax, dword ptr [esp + 0xc] // 56 | push esi // 57 | push edi $sequence_9 = { 6a30 68???????? e8???????? 83450840 83c40c ff45fc } // n = 6, score = 100 // 6a30 | push 0x30 // 68???????? | // e8???????? | // 83450840 | add dword ptr [ebp + 8], 0x40 // 83c40c | add esp, 0xc // ff45fc | inc dword ptr [ebp - 4] condition: 7 of them and filesize < 262144 }
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