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rule win_zeus_action_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.zeus_action." 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.zeus_action" 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 = { 8bcf 8b048a 3b048e 750b 41 83f903 } // n = 6, score = 300 // 8bcf | mov ecx, edi // 8b048a | mov eax, dword ptr [edx + ecx*4] // 3b048e | cmp eax, dword ptr [esi + ecx*4] // 750b | jne 0xd // 41 | inc ecx // 83f903 | cmp ecx, 3 $sequence_1 = { 57 8bfb ab ab ab ab 894dfc } // n = 7, score = 300 // 57 | push edi // 8bfb | mov edi, ebx // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 894dfc | mov dword ptr [ebp - 4], ecx $sequence_2 = { 68???????? 8d85d4fdffff 50 ff15???????? 85c0 7451 68???????? } // n = 7, score = 300 // 68???????? | // 8d85d4fdffff | lea eax, [ebp - 0x22c] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7451 | je 0x53 // 68???????? | $sequence_3 = { 8d45e8 50 8d45fc 68???????? 50 e8???????? 83c410 } // n = 7, score = 300 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // 8d45fc | lea eax, [ebp - 4] // 68???????? | // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 $sequence_4 = { 50 e8???????? 59 59 8944240c 85c0 745b } // n = 7, score = 300 // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8944240c | mov dword ptr [esp + 0xc], eax // 85c0 | test eax, eax // 745b | je 0x5d $sequence_5 = { 53 e8???????? 8bf8 59 85ff 0f843e010000 } // n = 6, score = 300 // 53 | push ebx // e8???????? | // 8bf8 | mov edi, eax // 59 | pop ecx // 85ff | test edi, edi // 0f843e010000 | je 0x144 $sequence_6 = { 81ecf0010000 53 33db 395d08 7441 803d????????01 7638 } // n = 7, score = 300 // 81ecf0010000 | sub esp, 0x1f0 // 53 | push ebx // 33db | xor ebx, ebx // 395d08 | cmp dword ptr [ebp + 8], ebx // 7441 | je 0x43 // 803d????????01 | // 7638 | jbe 0x3a $sequence_7 = { 7e06 899374010000 ff7510 52 53 e8???????? 83c40c } // n = 7, score = 300 // 7e06 | jle 8 // 899374010000 | mov dword ptr [ebx + 0x174], edx // ff7510 | push dword ptr [ebp + 0x10] // 52 | push edx // 53 | push ebx // e8???????? | // 83c40c | add esp, 0xc $sequence_8 = { 8b45f0 8b4ddc 03c2 2bf3 8b5dd4 8945cc 3bd0 } // n = 7, score = 300 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] // 03c2 | add eax, edx // 2bf3 | sub esi, ebx // 8b5dd4 | mov ebx, dword ptr [ebp - 0x2c] // 8945cc | mov dword ptr [ebp - 0x34], eax // 3bd0 | cmp edx, eax $sequence_9 = { 42 3bd3 72f0 8b4d24 8b7d20 8b4514 03f0 } // n = 7, score = 300 // 42 | inc edx // 3bd3 | cmp edx, ebx // 72f0 | jb 0xfffffff2 // 8b4d24 | mov ecx, dword ptr [ebp + 0x24] // 8b7d20 | mov edi, dword ptr [ebp + 0x20] // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 03f0 | add esi, eax condition: 7 of them and filesize < 827392 }
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