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rule win_koobface_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 50 c745fc0b000000 e8???????? 56 8985d4fdffff e8???????? 59 } // n = 7, score = 100 // 50 | push eax // c745fc0b000000 | mov dword ptr [ebp - 4], 0xb // e8???????? | // 56 | push esi // 8985d4fdffff | mov dword ptr [ebp - 0x22c], eax // e8???????? | // 59 | pop ecx $sequence_1 = { 50 56 8d8f8c000000 e8???????? 56 e8???????? } // n = 6, score = 100 // 50 | push eax // 56 | push esi // 8d8f8c000000 | lea ecx, [edi + 0x8c] // e8???????? | // 56 | push esi // e8???????? | $sequence_2 = { 8d4dd4 e8???????? 8b4db0 8d45d4 50 c645fc10 } // n = 6, score = 100 // 8d4dd4 | lea ecx, [ebp - 0x2c] // e8???????? | // 8b4db0 | mov ecx, dword ptr [ebp - 0x50] // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // c645fc10 | mov byte ptr [ebp - 4], 0x10 $sequence_3 = { 68???????? 57 8d8504fcffff 68???????? 50 e8???????? 8d8504fcffff } // n = 7, score = 100 // 68???????? | // 57 | push edi // 8d8504fcffff | lea eax, [ebp - 0x3fc] // 68???????? | // 50 | push eax // e8???????? | // 8d8504fcffff | lea eax, [ebp - 0x3fc] $sequence_4 = { ffd7 68???????? e8???????? 59 53 899d10fcffff ffd7 } // n = 7, score = 100 // ffd7 | call edi // 68???????? | // e8???????? | // 59 | pop ecx // 53 | push ebx // 899d10fcffff | mov dword ptr [ebp - 0x3f0], ebx // ffd7 | call edi $sequence_5 = { 8d4598 68???????? 50 899d68feffff e8???????? 68???????? } // n = 6, score = 100 // 8d4598 | lea eax, [ebp - 0x68] // 68???????? | // 50 | push eax // 899d68feffff | mov dword ptr [ebp - 0x198], ebx // e8???????? | // 68???????? | $sequence_6 = { 8d85fcfbffff 68???????? 50 e8???????? ff8df4f7ffff 59 59 } // n = 7, score = 100 // 8d85fcfbffff | lea eax, [ebp - 0x404] // 68???????? | // 50 | push eax // e8???????? | // ff8df4f7ffff | dec dword ptr [ebp - 0x80c] // 59 | pop ecx // 59 | pop ecx $sequence_7 = { 8b8af0fbffff 33c8 e8???????? 8b4af8 33c8 e8???????? b8???????? } // n = 7, score = 100 // 8b8af0fbffff | mov ecx, dword ptr [edx - 0x410] // 33c8 | xor ecx, eax // e8???????? | // 8b4af8 | mov ecx, dword ptr [edx - 8] // 33c8 | xor ecx, eax // e8???????? | // b8???????? | $sequence_8 = { ffb568a2ffff 8d85fca7ffff 50 83ec1c 8bcc 89a56ca2ffff } // n = 6, score = 100 // ffb568a2ffff | push dword ptr [ebp - 0x5d98] // 8d85fca7ffff | lea eax, [ebp - 0x5804] // 50 | push eax // 83ec1c | sub esp, 0x1c // 8bcc | mov ecx, esp // 89a56ca2ffff | mov dword ptr [ebp - 0x5d94], esp $sequence_9 = { 3bdf 72e7 33c0 eb04 83650800 } // n = 5, score = 100 // 3bdf | cmp ebx, edi // 72e7 | jb 0xffffffe9 // 33c0 | xor eax, eax // eb04 | jmp 6 // 83650800 | and dword ptr [ebp + 8], 0 condition: 7 of them and filesize < 368640 }
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