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rule win_ddkeylogger_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.ddkeylogger." 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.ddkeylogger" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8bc2 c1e802 8a0430 83e203 8801 c1e204 8bc7 } // n = 7, score = 200 // 8bc2 | mov eax, edx // c1e802 | shr eax, 2 // 8a0430 | mov al, byte ptr [eax + esi] // 83e203 | and edx, 3 // 8801 | mov byte ptr [ecx], al // c1e204 | shl edx, 4 // 8bc7 | mov eax, edi $sequence_1 = { 8810 40 49 75f7 8b45fc 8b4df8 } // n = 6, score = 200 // 8810 | mov byte ptr [eax], dl // 40 | inc eax // 49 | dec ecx // 75f7 | jne 0xfffffff9 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_2 = { 6a00 ff15???????? 85c0 0f8832010000 56 8d45fc } // n = 6, score = 200 // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 0f8832010000 | js 0x138 // 56 | push esi // 8d45fc | lea eax, [ebp - 4] $sequence_3 = { e8???????? 83c410 8b4704 0307 0fb65708 0fb60b 894510 } // n = 7, score = 200 // e8???????? | // 83c410 | add esp, 0x10 // 8b4704 | mov eax, dword ptr [edi + 4] // 0307 | add eax, dword ptr [edi] // 0fb65708 | movzx edx, byte ptr [edi + 8] // 0fb60b | movzx ecx, byte ptr [ebx] // 894510 | mov dword ptr [ebp + 0x10], eax $sequence_4 = { ff15???????? 8d9554fcffff 52 8d8564fcffff 50 6a00 6a00 } // n = 7, score = 200 // ff15???????? | // 8d9554fcffff | lea edx, [ebp - 0x3ac] // 52 | push edx // 8d8564fcffff | lea eax, [ebp - 0x39c] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 $sequence_5 = { 8d9560fbffff 6a00 52 e8???????? 83c444 c705????????00000000 } // n = 6, score = 200 // 8d9560fbffff | lea edx, [ebp - 0x4a0] // 6a00 | push 0 // 52 | push edx // e8???????? | // 83c444 | add esp, 0x44 // c705????????00000000 | $sequence_6 = { 83e61f 8d3c8580ee4500 8b07 c1e606 8a4c3004 f6c101 7514 } // n = 7, score = 200 // 83e61f | and esi, 0x1f // 8d3c8580ee4500 | lea edi, [eax*4 + 0x45ee80] // 8b07 | mov eax, dword ptr [edi] // c1e606 | shl esi, 6 // 8a4c3004 | mov cl, byte ptr [eax + esi + 4] // f6c101 | test cl, 1 // 7514 | jne 0x16 $sequence_7 = { 83c102 48 75eb 8b4db8 5f 5e } // n = 6, score = 200 // 83c102 | add ecx, 2 // 48 | dec eax // 75eb | jne 0xffffffed // 8b4db8 | mov ecx, dword ptr [ebp - 0x48] // 5f | pop edi // 5e | pop esi $sequence_8 = { 3d00002003 7312 6a00 6a00 } // n = 4, score = 200 // 3d00002003 | cmp eax, 0x3200000 // 7312 | jae 0x14 // 6a00 | push 0 // 6a00 | push 0 $sequence_9 = { 56 ff15???????? 56 8bf8 ff15???????? 3b3d???????? } // n = 6, score = 200 // 56 | push esi // ff15???????? | // 56 | push esi // 8bf8 | mov edi, eax // ff15???????? | // 3b3d???????? | condition: 7 of them and filesize < 808960 }
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