Actor(s): UPS
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rule win_keylogger_apt3_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 0f8fc0000000 68ec000000 e8???????? a3???????? 896840 8b0d???????? } // n = 6, score = 300 // 0f8fc0000000 | jg 0xc6 // 68ec000000 | push 0xec // e8???????? | // a3???????? | // 896840 | mov dword ptr [eax + 0x40], ebp // 8b0d???????? | $sequence_1 = { 8d44246c 50 51 e8???????? a1???????? 8d542434 52 } // n = 7, score = 300 // 8d44246c | lea eax, [esp + 0x6c] // 50 | push eax // 51 | push ecx // e8???????? | // a1???????? | // 8d542434 | lea edx, [esp + 0x34] // 52 | push edx $sequence_2 = { 52 a3???????? ff15???????? 8b0d???????? 8d44240c 50 } // n = 6, score = 300 // 52 | push edx // a3???????? | // ff15???????? | // 8b0d???????? | // 8d44240c | lea eax, [esp + 0xc] // 50 | push eax $sequence_3 = { 8944241c 758d 33c0 b9???????? 8d9b00000000 833900 7410 } // n = 7, score = 300 // 8944241c | mov dword ptr [esp + 0x1c], eax // 758d | jne 0xffffff8f // 33c0 | xor eax, eax // b9???????? | // 8d9b00000000 | lea ebx, [ebx] // 833900 | cmp dword ptr [ecx], 0 // 7410 | je 0x12 $sequence_4 = { 740b 380e 7416 50 ffd7 85c0 } // n = 6, score = 300 // 740b | je 0xd // 380e | cmp byte ptr [esi], cl // 7416 | je 0x18 // 50 | push eax // ffd7 | call edi // 85c0 | test eax, eax $sequence_5 = { 41 0fb65c0c18 885c041b 83c004 } // n = 4, score = 300 // 41 | inc ecx // 0fb65c0c18 | movzx ebx, byte ptr [esp + ecx + 0x18] // 885c041b | mov byte ptr [esp + eax + 0x1b], bl // 83c004 | add eax, 4 $sequence_6 = { 51 ffd7 a1???????? 8d54243c } // n = 4, score = 300 // 51 | push ecx // ffd7 | call edi // a1???????? | // 8d54243c | lea edx, [esp + 0x3c] $sequence_7 = { 6a00 56 ff15???????? 56 ff15???????? 8b4c2438 5e } // n = 7, score = 300 // 6a00 | push 0 // 56 | push esi // ff15???????? | // 56 | push esi // ff15???????? | // 8b4c2438 | mov ecx, dword ptr [esp + 0x38] // 5e | pop esi $sequence_8 = { ffd7 a1???????? 8d96b0010000 52 83c048 50 ffd7 } // n = 7, score = 300 // ffd7 | call edi // a1???????? | // 8d96b0010000 | lea edx, [esi + 0x1b0] // 52 | push edx // 83c048 | add eax, 0x48 // 50 | push eax // ffd7 | call edi $sequence_9 = { ffd3 89442420 83f8ff 7551 8b35???????? } // n = 5, score = 300 // ffd3 | call ebx // 89442420 | mov dword ptr [esp + 0x20], eax // 83f8ff | cmp eax, -1 // 7551 | jne 0x53 // 8b35???????? | condition: 7 of them and filesize < 761856 }
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