Actor(s): Turla
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rule win_turla_rpc_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.turla_rpc." 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.turla_rpc" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 66c7442474303b c644247655 c744246022362636 66c74424643825 c644246655 } // n = 5, score = 200 // 66c7442474303b | mov word ptr [ebp + 0x28], 0x3939 // c644247655 | mov byte ptr [ebp + 0x2a], 0x55 // c744246022362636 | mov dword ptr [ebp + 0x70], 0x3b27303e // 66c74424643825 | mov dword ptr [ebp + 0x74], 0x67663930 // c644246655 | mov word ptr [esp + 0x74], 0x3b30 $sequence_1 = { 66c7458c2630 c6458e55 c744245033273034 66c74424543155 } // n = 4, score = 200 // 66c7458c2630 | dec eax // c6458e55 | lea ecx, [esp + 0x20] // c744245033273034 | inc ecx // 66c74424543155 | mov eax, 1 $sequence_2 = { f30f7f8d98010000 c785b800000027273a27 c685bc00000055 c685d801000055 f30f7f85b0010000 660f6f05???????? } // n = 6, score = 200 // f30f7f8d98010000 | mov byte ptr [esp + 0x76], 0x55 // c785b800000027273a27 | mov dword ptr [esp + 0x60], 0x36263622 // c685bc00000055 | mov word ptr [esp + 0x64], 0x2538 // c685d801000055 | mov byte ptr [esp + 0x66], 0x55 // f30f7f85b0010000 | movdqu xmmword ptr [ebp + 0x198], xmm1 // 660f6f05???????? | $sequence_3 = { 66c7850c0100003a3b c6850e01000055 c745c007303431 c745c4133c3930 c645c855 } // n = 5, score = 200 // 66c7850c0100003a3b | mov word ptr [ebp + 0x10c], 0x3b3a // c6850e01000055 | mov byte ptr [ebp + 0x10e], 0x55 // c745c007303431 | mov dword ptr [ebp - 0x40], 0x31343007 // c745c4133c3930 | mov dword ptr [ebp - 0x3c], 0x30393c13 // c645c855 | mov byte ptr [ebp - 0x38], 0x55 $sequence_4 = { 660f6f05???????? c6858c00000055 c785e000000012302103 c785e40000003027263c c785e80000003a3b102d f30f7f85e0010000 660f6f05???????? } // n = 7, score = 200 // 660f6f05???????? | // c6858c00000055 | mov word ptr [ebp - 0x74], 0x3026 // c785e000000012302103 | mov byte ptr [ebp - 0x72], 0x55 // c785e40000003027263c | mov dword ptr [esp + 0x50], 0x34302733 // c785e80000003a3b102d | mov word ptr [esp + 0x54], 0x5531 // f30f7f85e0010000 | mov byte ptr [ebp + 0x8c], 0x55 // 660f6f05???????? | $sequence_5 = { 66c745283939 c6452a55 c745703e30273b c7457430396667 } // n = 4, score = 200 // 66c745283939 | mov dword ptr [ebp + 0xe0], 0x3213012 // c6452a55 | mov dword ptr [ebp + 0xe4], 0x3c262730 // c745703e30273b | mov dword ptr [ebp + 0xe8], 0x2d103b3a // c7457430396667 | movdqu xmmword ptr [ebp + 0x1e0], xmm0 $sequence_6 = { c745b06970746f c745b472536163 66c745b86c00 ff15???????? } // n = 4, score = 200 // c745b06970746f | mov dword ptr [ebp + 0x84], 0x5253830 // c745b472536163 | mov dword ptr [ebp + 0x88], 0x23d2134 // 66c745b86c00 | movdqu xmmword ptr [ebp + 0x130], xmm0 // ff15???????? | $sequence_7 = { f30f7f85e0010000 660f6f05???????? f30f7f8580010000 660f6f05???????? 66c785ec0000000255 c785a0000000193a3431 c785a4000000193c3727 } // n = 7, score = 200 // f30f7f85e0010000 | mov dword ptr [ebp + 0xb8], 0x273a2727 // 660f6f05???????? | // f30f7f8580010000 | mov byte ptr [ebp + 0xbc], 0x55 // 660f6f05???????? | // 66c785ec0000000255 | mov byte ptr [ebp + 0x1d8], 0x55 // c785a0000000193a3431 | movdqu xmmword ptr [ebp + 0x1b0], xmm0 // c785a4000000193c3727 | movdqu xmmword ptr [ebp + 0x1e0], xmm0 $sequence_8 = { c3 488d053bda0000 488d542458 488d4c2420 41b801000000 } // n = 5, score = 200 // c3 | ret // 488d053bda0000 | dec eax // 488d542458 | lea eax, [0xda3b] // 488d4c2420 | dec eax // 41b801000000 | lea edx, [esp + 0x58] $sequence_9 = { 85ff 7514 8d45ac 50 ff15???????? } // n = 5, score = 100 // 85ff | je 0x85 // 7514 | lea eax, [esp + 0x260] // 8d45ac | push eax // 50 | push esi // ff15???????? | $sequence_10 = { 83c414 8d85b8fdffff 50 8d8574fdffff 50 } // n = 5, score = 100 // 83c414 | test edi, edi // 8d85b8fdffff | jne 0x18 // 50 | lea eax, [ebp - 0x54] // 8d8574fdffff | push eax // 50 | add esp, 0x14 $sequence_11 = { 83feff 741d 6a00 8d45f8 50 } // n = 5, score = 100 // 83feff | push eax // 741d | add esp, 4 // 6a00 | push 2 // 8d45f8 | push 0 // 50 | cmp esi, -1 $sequence_12 = { 8bf0 85f6 747f 8d842460020000 50 56 ff15???????? } // n = 7, score = 100 // 8bf0 | mov dword ptr [edi], eax // 85f6 | add esp, 4 // 747f | push 2 // 8d842460020000 | push 0 // 50 | mov esi, eax // 56 | test esi, esi // ff15???????? | $sequence_13 = { e8???????? 83c404 6a02 ff15???????? 6a00 } // n = 5, score = 100 // e8???????? | // 83c404 | inc eax // 6a02 | push 1 // ff15???????? | // 6a00 | push eax $sequence_14 = { 40 83f80d 72f5 33c0 8d4900 80b40518ffffff55 } // n = 6, score = 100 // 40 | movdqu xmmword ptr [ebp + 0x150], xmm0 // 83f80d | mov dword ptr [ebp - 0x50], 0x6f747069 // 72f5 | mov dword ptr [ebp - 0x4c], 0x63615372 // 33c0 | mov word ptr [ebp - 0x48], 0x6c // 8d4900 | inc eax // 80b40518ffffff55 | cmp eax, 0xd $sequence_15 = { 56 ff15???????? 40 6a01 50 8907 } // n = 6, score = 100 // 56 | jb 0xfffffffa // ff15???????? | // 40 | xor eax, eax // 6a01 | lea ecx, [ecx] // 50 | xor byte ptr [ebp + eax - 0xe8], 0x55 // 8907 | push esi condition: 7 of them and filesize < 311296 }
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