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rule win_suppobox_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.suppobox." 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.suppobox" 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 = { 3bc8 7d10 a1???????? 2b05???????? } // n = 4, score = 200 // 3bc8 | cmp ecx, eax // 7d10 | jge 0x12 // a1???????? | // 2b05???????? | $sequence_1 = { 890d???????? e8???????? 8bf0 e8???????? 03f0 } // n = 5, score = 200 // 890d???????? | // e8???????? | // 8bf0 | mov esi, eax // e8???????? | // 03f0 | add esi, eax $sequence_2 = { 7f12 a1???????? 2b05???????? a3???????? } // n = 4, score = 200 // 7f12 | jg 0x14 // a1???????? | // 2b05???????? | // a3???????? | $sequence_3 = { 8945f0 a1???????? 83e801 a3???????? } // n = 4, score = 200 // 8945f0 | mov dword ptr [ebp - 0x10], eax // a1???????? | // 83e801 | sub eax, 1 // a3???????? | $sequence_4 = { 7412 8b0d???????? 030d???????? 890d???????? } // n = 4, score = 200 // 7412 | je 0x14 // 8b0d???????? | // 030d???????? | // 890d???????? | $sequence_5 = { 7d10 a1???????? 0b05???????? a3???????? } // n = 4, score = 200 // 7d10 | jge 0x12 // a1???????? | // 0b05???????? | // a3???????? | $sequence_6 = { 7f10 a1???????? 2305???????? a3???????? } // n = 4, score = 200 // 7f10 | jg 0x12 // a1???????? | // 2305???????? | // a3???????? | $sequence_7 = { 01bdacf7ffff 83c40c 83bdc8f7ffff00 8b95c8f7ffff } // n = 4, score = 100 // 01bdacf7ffff | add dword ptr [ebp - 0x854], edi // 83c40c | add esp, 0xc // 83bdc8f7ffff00 | cmp dword ptr [ebp - 0x838], 0 // 8b95c8f7ffff | mov edx, dword ptr [ebp - 0x838] $sequence_8 = { 01c6 ebdb ff7510 57 } // n = 4, score = 100 // 01c6 | add esi, eax // ebdb | jmp 0xffffffdd // ff7510 | push dword ptr [ebp + 0x10] // 57 | push edi $sequence_9 = { 019dacf7ffff 83c40c 299dc4f7ffff e9???????? } // n = 4, score = 100 // 019dacf7ffff | add dword ptr [ebp - 0x854], ebx // 83c40c | add esp, 0xc // 299dc4f7ffff | sub dword ptr [ebp - 0x83c], ebx // e9???????? | $sequence_10 = { 8b942484000000 89442440 0fb644244c e8???????? 8bbc2480000000 } // n = 5, score = 100 // 8b942484000000 | mov edx, dword ptr [esp + 0x84] // 89442440 | mov dword ptr [esp + 0x40], eax // 0fb644244c | movzx eax, byte ptr [esp + 0x4c] // e8???????? | // 8bbc2480000000 | mov edi, dword ptr [esp + 0x80] $sequence_11 = { 01c6 39fe 0f8d7e010000 80bc2ef4f7ffff0a } // n = 4, score = 100 // 01c6 | add esi, eax // 39fe | cmp esi, edi // 0f8d7e010000 | jge 0x184 // 80bc2ef4f7ffff0a | cmp byte ptr [esi + ebp - 0x80c], 0xa $sequence_12 = { 8b9424ac000000 8b4c2430 8b0c0a 8908 } // n = 4, score = 100 // 8b9424ac000000 | mov edx, dword ptr [esp + 0xac] // 8b4c2430 | mov ecx, dword ptr [esp + 0x30] // 8b0c0a | mov ecx, dword ptr [edx + ecx] // 8908 | mov dword ptr [eax], ecx $sequence_13 = { 01d8 3b85b0f7ffff 7e2f 8b95c8f7ffff } // n = 4, score = 100 // 01d8 | add eax, ebx // 3b85b0f7ffff | cmp eax, dword ptr [ebp - 0x850] // 7e2f | jle 0x31 // 8b95c8f7ffff | mov edx, dword ptr [ebp - 0x838] $sequence_14 = { 8b942494000000 85d2 0f8ecf040000 83bc24940000000e } // n = 4, score = 100 // 8b942494000000 | mov edx, dword ptr [esp + 0x94] // 85d2 | test edx, edx // 0f8ecf040000 | jle 0x4d5 // 83bc24940000000e | cmp dword ptr [esp + 0x94], 0xe $sequence_15 = { 01c9 4a 79f2 833b54 } // n = 4, score = 100 // 01c9 | add ecx, ecx // 4a | dec edx // 79f2 | jns 0xfffffff4 // 833b54 | cmp dword ptr [ebx], 0x54 $sequence_16 = { 01d7 68???????? 57 e8???????? } // n = 4, score = 100 // 01d7 | add edi, edx // 68???????? | // 57 | push edi // e8???????? | $sequence_17 = { 8b9500ffffff 83ea01 29d0 899500ffffff } // n = 4, score = 100 // 8b9500ffffff | mov edx, dword ptr [ebp - 0x100] // 83ea01 | sub edx, 1 // 29d0 | sub eax, edx // 899500ffffff | mov dword ptr [ebp - 0x100], edx $sequence_18 = { 8b9500ffffff 8d42ff 898500ffffff 0fb79d10feffff } // n = 4, score = 100 // 8b9500ffffff | mov edx, dword ptr [ebp - 0x100] // 8d42ff | lea eax, [edx - 1] // 898500ffffff | mov dword ptr [ebp - 0x100], eax // 0fb79d10feffff | movzx ebx, word ptr [ebp - 0x1f0] $sequence_19 = { 8b9504f9ffff 01c8 01d0 898504f9ffff } // n = 4, score = 100 // 8b9504f9ffff | mov edx, dword ptr [ebp - 0x6fc] // 01c8 | add eax, ecx // 01d0 | add eax, edx // 898504f9ffff | mov dword ptr [ebp - 0x6fc], eax $sequence_20 = { 8b9424ac000000 0f843cfeffff 31c9 e9???????? } // n = 4, score = 100 // 8b9424ac000000 | mov edx, dword ptr [esp + 0xac] // 0f843cfeffff | je 0xfffffe42 // 31c9 | xor ecx, ecx // e9???????? | $sequence_21 = { 01c6 39fe 0f8d2f020000 80bc2ef4f7ffff0a } // n = 4, score = 100 // 01c6 | add esi, eax // 39fe | cmp esi, edi // 0f8d2f020000 | jge 0x235 // 80bc2ef4f7ffff0a | cmp byte ptr [esi + ebp - 0x80c], 0xa condition: 7 of them and filesize < 1875968 }
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