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rule win_goldenspy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.goldenspy." 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.goldenspy" 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 = { c745d400000000 0f1100 660fd64010 c740140f000000 8901 } // n = 5, score = 100 // c745d400000000 | mov dword ptr [ebp - 0x2c], 0 // 0f1100 | movups xmmword ptr [eax], xmm0 // 660fd64010 | movq qword ptr [eax + 0x10], xmm0 // c740140f000000 | mov dword ptr [eax + 0x14], 0xf // 8901 | mov dword ptr [ecx], eax $sequence_1 = { 8b04c584ef4500 5d c3 8bff 55 8bec 56 } // n = 7, score = 100 // 8b04c584ef4500 | mov eax, dword ptr [eax*8 + 0x45ef84] // 5d | pop ebp // c3 | ret // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp // 56 | push esi $sequence_2 = { 8d8d40ffffff e8???????? 8bc6 8b4df4 64890d00000000 59 5f } // n = 7, score = 100 // 8d8d40ffffff | lea ecx, [ebp - 0xc0] // e8???????? | // 8bc6 | mov eax, esi // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi $sequence_3 = { 0f11850cffffff 0f1005???????? 0f11851cffffff f30f7e05???????? 660fd6852cffffff 8a02 42 } // n = 7, score = 100 // 0f11850cffffff | movups xmmword ptr [ebp - 0xf4], xmm0 // 0f1005???????? | // 0f11851cffffff | movups xmmword ptr [ebp - 0xe4], xmm0 // f30f7e05???????? | // 660fd6852cffffff | movq qword ptr [ebp - 0xd4], xmm0 // 8a02 | mov al, byte ptr [edx] // 42 | inc edx $sequence_4 = { 81a548ffffff00feffff 89853cffffff c7854cffffff00000000 8d8d50ffffff c745fc01000000 e8???????? } // n = 6, score = 100 // 81a548ffffff00feffff | and dword ptr [ebp - 0xb8], 0xfffffe00 // 89853cffffff | mov dword ptr [ebp - 0xc4], eax // c7854cffffff00000000 | mov dword ptr [ebp - 0xb4], 0 // 8d8d50ffffff | lea ecx, [ebp - 0xb0] // c745fc01000000 | mov dword ptr [ebp - 4], 1 // e8???????? | $sequence_5 = { e8???????? 8d8de8feffff c645fc19 e8???????? 8b36 3bf7 0f8567fcffff } // n = 7, score = 100 // e8???????? | // 8d8de8feffff | lea ecx, [ebp - 0x118] // c645fc19 | mov byte ptr [ebp - 4], 0x19 // e8???????? | // 8b36 | mov esi, dword ptr [esi] // 3bf7 | cmp esi, edi // 0f8567fcffff | jne 0xfffffc6d $sequence_6 = { 52 51 e8???????? 83c408 33f6 8b55ec 83fa10 } // n = 7, score = 100 // 52 | push edx // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 33f6 | xor esi, esi // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 83fa10 | cmp edx, 0x10 $sequence_7 = { c745d444e04600 e8???????? 8b55ec c7464400000000 c6464300 c6464800 83fa10 } // n = 7, score = 100 // c745d444e04600 | mov dword ptr [ebp - 0x2c], 0x46e044 // e8???????? | // 8b55ec | mov edx, dword ptr [ebp - 0x14] // c7464400000000 | mov dword ptr [esi + 0x44], 0 // c6464300 | mov byte ptr [esi + 0x43], 0 // c6464800 | mov byte ptr [esi + 0x48], 0 // 83fa10 | cmp edx, 0x10 $sequence_8 = { 8b09 51 52 50 51 8d8d70ffffff e8???????? } // n = 7, score = 100 // 8b09 | mov ecx, dword ptr [ecx] // 51 | push ecx // 52 | push edx // 50 | push eax // 51 | push ecx // 8d8d70ffffff | lea ecx, [ebp - 0x90] // e8???????? | $sequence_9 = { 0f82d0000000 8b49fc 83c223 2bc1 83c0fc 83f81f 0f87e4000000 } // n = 7, score = 100 // 0f82d0000000 | jb 0xd6 // 8b49fc | mov ecx, dword ptr [ecx - 4] // 83c223 | add edx, 0x23 // 2bc1 | sub eax, ecx // 83c0fc | add eax, -4 // 83f81f | cmp eax, 0x1f // 0f87e4000000 | ja 0xea condition: 7 of them and filesize < 1081344 }
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