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rule win_data_exfiltrator_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.data_exfiltrator." 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.data_exfiltrator" 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 = { 4889442448 48c744242800000000 48837c247000 7e0c b801000000 6689442420 eb07 } // n = 7, score = 100 // 4889442448 | dec eax // 48c744242800000000 | mov dword ptr [esp + 0x40], eax // 48837c247000 | dec eax // 7e0c | mov eax, dword ptr [esp + 0x40] // b801000000 | cmp dword ptr [eax], 0x4550 // 6689442420 | dec eax // eb07 | mov ecx, dword ptr [esp + 0x100] $sequence_1 = { ffc8 4898 488b4c2430 488d0441 } // n = 4, score = 100 // ffc8 | mov edx, eax // 4898 | dec eax // 488b4c2430 | mov ecx, dword ptr [esp + 0x108] // 488d0441 | test eax, eax $sequence_2 = { 8844242c 0fb644242c 85c0 740d 0fb644242d 85c0 0f8479010000 } // n = 7, score = 100 // 8844242c | mov ecx, dword ptr [esp + 0x88] // 0fb644242c | mov ecx, 0x4038 // 85c0 | dec eax // 740d | mov dword ptr [esp + 0x78], eax // 0fb644242d | mov eax, dword ptr [esp + 0x58] // 85c0 | add eax, 0x100 // 0f8479010000 | mov eax, eax $sequence_3 = { 83b82440000000 762e 66ba0101 488b4c2460 e8???????? } // n = 5, score = 100 // 83b82440000000 | cmp dword ptr [esp + 0x20], 0x7f17 // 762e | dec eax // 66ba0101 | sub esp, 0x38 // 488b4c2460 | dec eax // e8???????? | $sequence_4 = { 4c89442418 4889542410 48894c2408 4883ec58 488b442460 0fb68008400000 85c0 } // n = 7, score = 100 // 4c89442418 | dec eax // 4889542410 | lea eax, [0xffffd955] // 48894c2408 | mov cl, byte ptr [esp + 0x20] // 4883ec58 | dec eax // 488b442460 | mov ecx, dword ptr [esp + 0x40] // 0fb68008400000 | dec eax // 85c0 | mov edx, dword ptr [esp + 0x20] $sequence_5 = { 5e c3 89542410 894c2408 4883ec18 837c242800 7507 } // n = 7, score = 100 // 5e | dec eax // c3 | mov eax, ecx // 89542410 | mov ecx, dword ptr [esp + 0x24] // 894c2408 | dec eax // 4883ec18 | mov edx, dword ptr [esp + 0xa0] // 837c242800 | mov eax, dword ptr [eax + 0x1c] // 7507 | dec eax $sequence_6 = { 488b8424c8000000 4825ffff0000 6689442420 488b442430 8b4010 } // n = 5, score = 100 // 488b8424c8000000 | dec eax // 4825ffff0000 | mov ecx, dword ptr [ecx + 0x4018] // 6689442420 | dec eax // 488b442430 | mov edx, dword ptr [esp + 0x10] // 8b4010 | mov byte ptr [edx + ecx], al $sequence_7 = { c6401000 48c744243000000000 c744242880000000 c744242003000000 4533c9 4533c0 } // n = 6, score = 100 // c6401000 | dec eax // 48c744243000000000 | mov edx, dword ptr [esp + 0x20] // c744242880000000 | mov dword ptr [ecx + edx*4 + 8], eax // c744242003000000 | xor edx, edx // 4533c9 | mov ecx, 0x40000 // 4533c0 | dec eax $sequence_8 = { 0fb68008400000 85c0 7518 488b4c2460 e8???????? 66ba0001 488b4c2460 } // n = 7, score = 100 // 0fb68008400000 | mov ecx, dword ptr [esp + 0x30] // 85c0 | dec eax // 7518 | mov eax, dword ptr [esp + 0x30] // 488b4c2460 | dec eax // e8???????? | // 66ba0001 | add esp, 0xe8 // 488b4c2460 | ret $sequence_9 = { c64424346d c64424354f c644243672 c644243778 c644243878 } // n = 5, score = 100 // c64424346d | jae 0x1b5 // c64424354f | dec eax // c644243672 | mov eax, dword ptr [esp + 0x20] // c644243778 | mov ecx, dword ptr [eax] // c644243878 | test eax, eax condition: 7 of them and filesize < 107520 }
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