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rule win_koobface_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.koobface." 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.koobface" 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 = { 8d850cffffff 50 c745fc26000000 e8???????? 834dfcff 53 } // n = 6, score = 100 // 8d850cffffff | lea eax, [ebp - 0xf4] // 50 | push eax // c745fc26000000 | mov dword ptr [ebp - 4], 0x26 // e8???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 53 | push ebx $sequence_1 = { e8???????? 33db 59 889dfaf7ffff 889dfbf7ffff 899decf7ffff 899de0f7ffff } // n = 7, score = 100 // e8???????? | // 33db | xor ebx, ebx // 59 | pop ecx // 889dfaf7ffff | mov byte ptr [ebp - 0x806], bl // 889dfbf7ffff | mov byte ptr [ebp - 0x805], bl // 899decf7ffff | mov dword ptr [ebp - 0x814], ebx // 899de0f7ffff | mov dword ptr [ebp - 0x820], ebx $sequence_2 = { 83bd34c1ffff0a 754c 8d8540c1ffff 6a41 50 } // n = 5, score = 100 // 83bd34c1ffff0a | cmp dword ptr [ebp - 0x3ecc], 0xa // 754c | jne 0x4e // 8d8540c1ffff | lea eax, [ebp - 0x3ec0] // 6a41 | push 0x41 // 50 | push eax $sequence_3 = { 50 c745cc5cd74100 e8???????? 8b7508 bf63736de0 393e 0f85a5010000 } // n = 7, score = 100 // 50 | push eax // c745cc5cd74100 | mov dword ptr [ebp - 0x34], 0x41d75c // e8???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // bf63736de0 | mov edi, 0xe06d7363 // 393e | cmp dword ptr [esi], edi // 0f85a5010000 | jne 0x1ab $sequence_4 = { e8???????? 50 8d8538f4ffff 50 e8???????? 8b8520f4ffff 59 } // n = 7, score = 100 // e8???????? | // 50 | push eax // 8d8538f4ffff | lea eax, [ebp - 0xbc8] // 50 | push eax // e8???????? | // 8b8520f4ffff | mov eax, dword ptr [ebp - 0xbe0] // 59 | pop ecx $sequence_5 = { e8???????? 8b8598faffff c1e803 50 8d85a4faffff 57 50 } // n = 7, score = 100 // e8???????? | // 8b8598faffff | mov eax, dword ptr [ebp - 0x568] // c1e803 | shr eax, 3 // 50 | push eax // 8d85a4faffff | lea eax, [ebp - 0x55c] // 57 | push edi // 50 | push eax $sequence_6 = { 8d8528ffffff 68???????? 50 e8???????? 83c40c 8d8528ffffff 50 } // n = 7, score = 100 // 8d8528ffffff | lea eax, [ebp - 0xd8] // 68???????? | // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8d8528ffffff | lea eax, [ebp - 0xd8] // 50 | push eax $sequence_7 = { 8d8528ffffff 50 e8???????? 68???????? 8d850857ffff } // n = 5, score = 100 // 8d8528ffffff | lea eax, [ebp - 0xd8] // 50 | push eax // e8???????? | // 68???????? | // 8d850857ffff | lea eax, [ebp - 0xa8f8] $sequence_8 = { 8d4de4 51 53 ff90e0000000 837de404 7407 } // n = 6, score = 100 // 8d4de4 | lea ecx, [ebp - 0x1c] // 51 | push ecx // 53 | push ebx // ff90e0000000 | call dword ptr [eax + 0xe0] // 837de404 | cmp dword ptr [ebp - 0x1c], 4 // 7407 | je 9 $sequence_9 = { 68???????? e8???????? 59 57 e8???????? 59 8b4dfc } // n = 7, score = 100 // 68???????? | // e8???????? | // 59 | pop ecx // 57 | push edi // e8???????? | // 59 | pop ecx // 8b4dfc | mov ecx, dword ptr [ebp - 4] condition: 7 of them and filesize < 368640 }
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