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rule win_glupteba_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.glupteba." 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.glupteba" 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 = { 895dd0 89bdccfeffff 89b5c8feffff 33c9 8d85ccfeffff 3910 7408 } // n = 7, score = 400 // 895dd0 | mov dword ptr [ebp - 0x30], ebx // 89bdccfeffff | mov dword ptr [ebp - 0x134], edi // 89b5c8feffff | mov dword ptr [ebp - 0x138], esi // 33c9 | xor ecx, ecx // 8d85ccfeffff | lea eax, [ebp - 0x134] // 3910 | cmp dword ptr [eax], edx // 7408 | je 0xa $sequence_1 = { 6a02 ff75f2 ff15???????? ff75f2 ff15???????? 838b????????ff ff0d???????? } // n = 7, score = 400 // 6a02 | push 2 // ff75f2 | push dword ptr [ebp - 0xe] // ff15???????? | // ff75f2 | push dword ptr [ebp - 0xe] // ff15???????? | // 838b????????ff | // ff0d???????? | $sequence_2 = { a0???????? 3ac3 7418 53 } // n = 4, score = 400 // a0???????? | // 3ac3 | cmp al, bl // 7418 | je 0x1a // 53 | push ebx $sequence_3 = { 33770c 8b7dc8 3375e0 ff4de8 894dd4 897dd8 8975dc } // n = 7, score = 400 // 33770c | xor esi, dword ptr [edi + 0xc] // 8b7dc8 | mov edi, dword ptr [ebp - 0x38] // 3375e0 | xor esi, dword ptr [ebp - 0x20] // ff4de8 | dec dword ptr [ebp - 0x18] // 894dd4 | mov dword ptr [ebp - 0x2c], ecx // 897dd8 | mov dword ptr [ebp - 0x28], edi // 8975dc | mov dword ptr [ebp - 0x24], esi $sequence_4 = { 897904 8b7b08 895304 8b5008 33fa 897908 8b7b0c } // n = 7, score = 400 // 897904 | mov dword ptr [ecx + 4], edi // 8b7b08 | mov edi, dword ptr [ebx + 8] // 895304 | mov dword ptr [ebx + 4], edx // 8b5008 | mov edx, dword ptr [eax + 8] // 33fa | xor edi, edx // 897908 | mov dword ptr [ecx + 8], edi // 8b7b0c | mov edi, dword ptr [ebx + 0xc] $sequence_5 = { 83c40c ff750c 66c745f00200 ff15???????? 668945f2 6a10 } // n = 6, score = 400 // 83c40c | add esp, 0xc // ff750c | push dword ptr [ebp + 0xc] // 66c745f00200 | mov word ptr [ebp - 0x10], 2 // ff15???????? | // 668945f2 | mov word ptr [ebp - 0xe], ax // 6a10 | push 0x10 $sequence_6 = { 8b7f0c 33780c 0fb6d2 c1ea04 4a 894510 895dd0 } // n = 7, score = 400 // 8b7f0c | mov edi, dword ptr [edi + 0xc] // 33780c | xor edi, dword ptr [eax + 0xc] // 0fb6d2 | movzx edx, dl // c1ea04 | shr edx, 4 // 4a | dec edx // 894510 | mov dword ptr [ebp + 0x10], eax // 895dd0 | mov dword ptr [ebp - 0x30], ebx $sequence_7 = { 0f8491000000 6a06 8d45d4 50 57 } // n = 5, score = 400 // 0f8491000000 | je 0x97 // 6a06 | push 6 // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // 57 | push edi $sequence_8 = { 00cd 3e46 005e3e 46 } // n = 4, score = 100 // 00cd | add ch, cl // 3e46 | inc esi // 005e3e | add byte ptr [esi + 0x3e], bl // 46 | inc esi $sequence_9 = { 005e3e 46 00ff 3e46 } // n = 4, score = 100 // 005e3e | add byte ptr [esi + 0x3e], bl // 46 | inc esi // 00ff | add bh, bh // 3e46 | inc esi $sequence_10 = { 00f1 3d46005e3e 46 00cd } // n = 4, score = 100 // 00f1 | add cl, dh // 3d46005e3e | cmp eax, 0x3e5e0046 // 46 | inc esi // 00cd | add ch, cl $sequence_11 = { 00ff 3e46 0012 3f } // n = 4, score = 100 // 00ff | add bh, bh // 3e46 | inc esi // 0012 | add byte ptr [edx], dl // 3f | aas $sequence_12 = { 0101 03d3 8b4620 8bcb } // n = 4, score = 100 // 0101 | add dword ptr [ecx], eax // 03d3 | add edx, ebx // 8b4620 | mov eax, dword ptr [esi + 0x20] // 8bcb | mov ecx, ebx $sequence_13 = { 0106 830702 392e 75a0 } // n = 4, score = 100 // 0106 | add dword ptr [esi], eax // 830702 | add dword ptr [edi], 2 // 392e | cmp dword ptr [esi], ebp // 75a0 | jne 0xffffffa2 $sequence_14 = { 0012 3f 46 008bff558bec } // n = 4, score = 100 // 0012 | add byte ptr [edx], dl // 3f | aas // 46 | inc esi // 008bff558bec | add byte ptr [ebx - 0x1374aa01], cl $sequence_15 = { 0107 eb4d 8b02 89442418 } // n = 4, score = 100 // 0107 | add dword ptr [edi], eax // eb4d | jmp 0x4f // 8b02 | mov eax, dword ptr [edx] // 89442418 | mov dword ptr [esp + 0x18], eax condition: 7 of them and filesize < 1417216 }
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