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rule win_arik_keylogger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.arik_keylogger." 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.arik_keylogger" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b45fc f7402801000000 755a 8b45fc 8b55fc 8b12 ff927c040000 } // n = 7, score = 100 // 8b45fc | mov eax, dword ptr [ebp - 4] // f7402801000000 | test dword ptr [eax + 0x28], 1 // 755a | jne 0x5c // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b12 | mov edx, dword ptr [edx] // ff927c040000 | call dword ptr [edx + 0x47c] $sequence_1 = { dd5df8 e8???????? ba???????? 8d45c0 e8???????? 58 85c0 } // n = 7, score = 100 // dd5df8 | fstp qword ptr [ebp - 8] // e8???????? | // ba???????? | // 8d45c0 | lea eax, [ebp - 0x40] // e8???????? | // 58 | pop eax // 85c0 | test eax, eax $sequence_2 = { 8b804c010000 e8???????? e8???????? 84c0 7424 8b45f8 8b804c010000 } // n = 7, score = 100 // 8b804c010000 | mov eax, dword ptr [eax + 0x14c] // e8???????? | // e8???????? | // 84c0 | test al, al // 7424 | je 0x26 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b804c010000 | mov eax, dword ptr [eax + 0x14c] $sequence_3 = { b003 e9???????? b004 e9???????? b005 e9???????? b006 } // n = 7, score = 100 // b003 | mov al, 3 // e9???????? | // b004 | mov al, 4 // e9???????? | // b005 | mov al, 5 // e9???????? | // b006 | mov al, 6 $sequence_4 = { e8???????? 8b45ec 8908 8b45f0 8b08 034df4 7105 } // n = 7, score = 100 // e8???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8908 | mov dword ptr [eax], ecx // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b08 | mov ecx, dword ptr [eax] // 034df4 | add ecx, dword ptr [ebp - 0xc] // 7105 | jno 7 $sequence_5 = { e8???????? 50 85c0 0f8528010000 8b45b8 e8???????? c745b400000000 } // n = 7, score = 100 // e8???????? | // 50 | push eax // 85c0 | test eax, eax // 0f8528010000 | jne 0x12e // 8b45b8 | mov eax, dword ptr [ebp - 0x48] // e8???????? | // c745b400000000 | mov dword ptr [ebp - 0x4c], 0 $sequence_6 = { eb16 8b45fc 8b4004 0d00001000 0d00002000 8b55fc 894204 } // n = 7, score = 100 // eb16 | jmp 0x18 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4004 | mov eax, dword ptr [eax + 4] // 0d00001000 | or eax, 0x100000 // 0d00002000 | or eax, 0x200000 // 8b55fc | mov edx, dword ptr [ebp - 4] // 894204 | mov dword ptr [edx + 4], eax $sequence_7 = { f3a5 8b45f4 83b8d002000000 7432 8b45f8 50 8b4518 } // n = 7, score = 100 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83b8d002000000 | cmp dword ptr [eax + 0x2d0], 0 // 7432 | je 0x34 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 50 | push eax // 8b4518 | mov eax, dword ptr [ebp + 0x18] $sequence_8 = { 8b45f4 e8???????? 8b45f4 83c024 8a4d08 8d55ec e8???????? } // n = 7, score = 100 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // e8???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83c024 | add eax, 0x24 // 8a4d08 | mov cl, byte ptr [ebp + 8] // 8d55ec | lea edx, [ebp - 0x14] // e8???????? | $sequence_9 = { 8d45d4 e8???????? c745d400000000 8d45d0 e8???????? c745d000000000 8b4614 } // n = 7, score = 100 // 8d45d4 | lea eax, [ebp - 0x2c] // e8???????? | // c745d400000000 | mov dword ptr [ebp - 0x2c], 0 // 8d45d0 | lea eax, [ebp - 0x30] // e8???????? | // c745d000000000 | mov dword ptr [ebp - 0x30], 0 // 8b4614 | mov eax, dword ptr [esi + 0x14] condition: 7 of them and filesize < 4947968 }
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