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rule win_zeus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.zeus." 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" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { eb58 833f00 7651 8b5f08 } // n = 4, score = 700 // eb58 | jmp 0x5a // 833f00 | cmp dword ptr [edi], 0 // 7651 | jbe 0x53 // 8b5f08 | mov ebx, dword ptr [edi + 8] $sequence_1 = { 8b35???????? 8d5610 57 8b3a 3b7d08 } // n = 5, score = 600 // 8b35???????? | // 8d5610 | lea edx, [esi + 0x10] // 57 | push edi // 8b3a | mov edi, dword ptr [edx] // 3b7d08 | cmp edi, dword ptr [ebp + 8] $sequence_2 = { 8b33 393e 770f e8???????? 84c0 7406 8b03 } // n = 7, score = 600 // 8b33 | mov esi, dword ptr [ebx] // 393e | cmp dword ptr [esi], edi // 770f | ja 0x11 // e8???????? | // 84c0 | test al, al // 7406 | je 8 // 8b03 | mov eax, dword ptr [ebx] $sequence_3 = { 8b16 8b02 03c2 897808 85ff 760d 57 } // n = 7, score = 600 // 8b16 | mov edx, dword ptr [esi] // 8b02 | mov eax, dword ptr [edx] // 03c2 | add eax, edx // 897808 | mov dword ptr [eax + 8], edi // 85ff | test edi, edi // 760d | jbe 0xf // 57 | push edi $sequence_4 = { 8b32 8d4c3110 81f90000a000 7715 8918 c7400400000200 89780c } // n = 7, score = 600 // 8b32 | mov esi, dword ptr [edx] // 8d4c3110 | lea ecx, [ecx + esi + 0x10] // 81f90000a000 | cmp ecx, 0xa00000 // 7715 | ja 0x17 // 8918 | mov dword ptr [eax], ebx // c7400400000200 | mov dword ptr [eax + 4], 0x20000 // 89780c | mov dword ptr [eax + 0xc], edi $sequence_5 = { 8b3e 741b 6802010000 ff7510 8d85f8feffff 50 e8???????? } // n = 7, score = 600 // 8b3e | mov edi, dword ptr [esi] // 741b | je 0x1d // 6802010000 | push 0x102 // ff7510 | push dword ptr [ebp + 0x10] // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // e8???????? | $sequence_6 = { 8b3d???????? 3bfe 744f 56 56 56 ff74241c } // n = 7, score = 600 // 8b3d???????? | // 3bfe | cmp edi, esi // 744f | je 0x51 // 56 | push esi // 56 | push esi // 56 | push esi // ff74241c | push dword ptr [esp + 0x1c] $sequence_7 = { 8b3a 3b7d08 740a 40 } // n = 4, score = 600 // 8b3a | mov edi, dword ptr [edx] // 3b7d08 | cmp edi, dword ptr [ebp + 8] // 740a | je 0xc // 40 | inc eax $sequence_8 = { 891d???????? 891d???????? ffd6 68???????? } // n = 4, score = 500 // 891d???????? | // 891d???????? | // ffd6 | call esi // 68???????? | $sequence_9 = { 8bf3 6810270000 ff35???????? ff15???????? } // n = 4, score = 500 // 8bf3 | mov esi, ebx // 6810270000 | push 0x2710 // ff35???????? | // ff15???????? | $sequence_10 = { e8???????? 84c0 7442 6a10 } // n = 4, score = 500 // e8???????? | // 84c0 | test al, al // 7442 | je 0x44 // 6a10 | push 0x10 $sequence_11 = { 8d8db0fdffff e8???????? 8ad8 84db } // n = 4, score = 400 // 8d8db0fdffff | lea ecx, [ebp - 0x250] // e8???????? | // 8ad8 | mov bl, al // 84db | test bl, bl $sequence_12 = { c20400 55 8bec f6451802 } // n = 4, score = 300 // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // f6451802 | test byte ptr [ebp + 0x18], 2 $sequence_13 = { 5e 8ac3 5b c20800 55 8bec 83e4f8 } // n = 7, score = 300 // 5e | pop esi // 8ac3 | mov al, bl // 5b | pop ebx // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 $sequence_14 = { 0f84c5000000 57 8d75f4 e8???????? 84c0 0f84ac000000 b809080002 } // n = 7, score = 200 // 0f84c5000000 | je 0xcb // 57 | push edi // 8d75f4 | lea esi, [ebp - 0xc] // e8???????? | // 84c0 | test al, al // 0f84ac000000 | je 0xb2 // b809080002 | mov eax, 0x2000809 $sequence_15 = { 6813270000 6a04 5b 8bc6 c745f809080002 } // n = 5, score = 200 // 6813270000 | push 0x2713 // 6a04 | push 4 // 5b | pop ebx // 8bc6 | mov eax, esi // c745f809080002 | mov dword ptr [ebp - 8], 0x2000809 $sequence_16 = { 6809080002 8bc6 50 8d45fc 50 e8???????? } // n = 6, score = 200 // 6809080002 | push 0x2000809 // 8bc6 | mov eax, esi // 50 | push eax // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // e8???????? | $sequence_17 = { e8???????? 68e6010000 68???????? 6809080002 } // n = 4, score = 200 // e8???????? | // 68e6010000 | push 0x1e6 // 68???????? | // 6809080002 | push 0x2000809 $sequence_18 = { 2501000080 7905 48 83c8fe 40 ff75f4 f7d8 } // n = 7, score = 200 // 2501000080 | and eax, 0x80000001 // 7905 | jns 7 // 48 | dec eax // 83c8fe | or eax, 0xfffffffe // 40 | inc eax // ff75f4 | push dword ptr [ebp - 0xc] // f7d8 | neg eax $sequence_19 = { b364 6a14 eb18 81fb5a5c4156 } // n = 4, score = 200 // b364 | mov bl, 0x64 // 6a14 | push 0x14 // eb18 | jmp 0x1a // 81fb5a5c4156 | cmp ebx, 0x56415c5a $sequence_20 = { 740c 81fb45415356 0f85b2000000 b365 6a15 } // n = 5, score = 200 // 740c | je 0xe // 81fb45415356 | cmp ebx, 0x56534145 // 0f85b2000000 | jne 0xb8 // b365 | mov bl, 0x65 // 6a15 | push 0x15 $sequence_21 = { 8d470c 50 c707000e0000 c7470809080002 e8???????? } // n = 5, score = 200 // 8d470c | lea eax, [edi + 0xc] // 50 | push eax // c707000e0000 | mov dword ptr [edi], 0xe00 // c7470809080002 | mov dword ptr [edi + 8], 0x2000809 // e8???????? | $sequence_22 = { 3d59495351 0f85ca000000 807b0420 0f85c0000000 33c0 83c6fb } // n = 6, score = 200 // 3d59495351 | cmp eax, 0x51534959 // 0f85ca000000 | jne 0xd0 // 807b0420 | cmp byte ptr [ebx + 4], 0x20 // 0f85c0000000 | jne 0xc6 // 33c0 | xor eax, eax // 83c6fb | add esi, -5 condition: 7 of them and filesize < 319488 }
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