Actor(s): UPS
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rule win_keylogger_apt3_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.keylogger_apt3." 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.keylogger_apt3" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { be???????? 90 837e04ff 750e 8b0e 394c2414 } // n = 6, score = 300 // be???????? | // 90 | nop // 837e04ff | cmp dword ptr [esi + 4], -1 // 750e | jne 0x10 // 8b0e | mov ecx, dword ptr [esi] // 394c2414 | cmp dword ptr [esp + 0x14], ecx $sequence_1 = { 52 83c048 50 ffd7 8b15???????? 8d8ec0010000 51 } // n = 7, score = 300 // 52 | push edx // 83c048 | add eax, 0x48 // 50 | push eax // ffd7 | call edi // 8b15???????? | // 8d8ec0010000 | lea ecx, [esi + 0x1c0] // 51 | push ecx $sequence_2 = { 51 ffd7 a1???????? 8d96b0010000 } // n = 4, score = 300 // 51 | push ecx // ffd7 | call edi // a1???????? | // 8d96b0010000 | lea edx, [esi + 0x1b0] $sequence_3 = { 85c0 7416 8d3c28 8b442430 50 57 } // n = 6, score = 300 // 85c0 | test eax, eax // 7416 | je 0x18 // 8d3c28 | lea edi, [eax + ebp] // 8b442430 | mov eax, dword ptr [esp + 0x30] // 50 | push eax // 57 | push edi $sequence_4 = { 6a0c 51 66894c240c 8d4c240c ba02000000 } // n = 5, score = 300 // 6a0c | push 0xc // 51 | push ecx // 66894c240c | mov word ptr [esp + 0xc], cx // 8d4c240c | lea ecx, [esp + 0xc] // ba02000000 | mov edx, 2 $sequence_5 = { 81c114010000 03c7 81f9???????? 7ceb 8d7c00ff } // n = 5, score = 300 // 81c114010000 | add ecx, 0x114 // 03c7 | add eax, edi // 81f9???????? | // 7ceb | jl 0xffffffed // 8d7c00ff | lea edi, [eax + eax - 1] $sequence_6 = { ff15???????? 8bf0 85f6 752e ff15???????? 3d31040000 } // n = 6, score = 300 // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 752e | jne 0x30 // ff15???????? | // 3d31040000 | cmp eax, 0x431 $sequence_7 = { 50 0fb68694010000 51 52 50 8d4c245c 68???????? } // n = 7, score = 300 // 50 | push eax // 0fb68694010000 | movzx eax, byte ptr [esi + 0x194] // 51 | push ecx // 52 | push edx // 50 | push eax // 8d4c245c | lea ecx, [esp + 0x5c] // 68???????? | $sequence_8 = { 8d4c2434 6a04 51 e8???????? 6a00 6a08 56 } // n = 7, score = 300 // 8d4c2434 | lea ecx, [esp + 0x34] // 6a04 | push 4 // 51 | push ecx // e8???????? | // 6a00 | push 0 // 6a08 | push 8 // 56 | push esi $sequence_9 = { e8???????? 8d4d0c 51 50 8d5508 52 } // n = 6, score = 300 // e8???????? | // 8d4d0c | lea ecx, [ebp + 0xc] // 51 | push ecx // 50 | push eax // 8d5508 | lea edx, [ebp + 8] // 52 | push edx condition: 7 of them and filesize < 761856 }
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