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rule win_hamweq_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.hamweq" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { ff501c 8b06 ff7508 ff5020 8b4e08 8b06 ffb180010000 } // n = 7, score = 200 // ff501c | call dword ptr [eax + 0x1c] // 8b06 | mov eax, dword ptr [esi] // ff7508 | push dword ptr [ebp + 8] // ff5020 | call dword ptr [eax + 0x20] // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8b06 | mov eax, dword ptr [esi] // ffb180010000 | push dword ptr [ecx + 0x180] $sequence_1 = { 8945f4 0f8460070000 833d????????00 7475 c745fc10504000 } // n = 5, score = 200 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 0f8460070000 | je 0x766 // 833d????????00 | // 7475 | je 0x77 // c745fc10504000 | mov dword ptr [ebp - 4], 0x405010 $sequence_2 = { ff5044 3bd8 7cb4 8b4608 c644070401 } // n = 5, score = 200 // ff5044 | call dword ptr [eax + 0x44] // 3bd8 | cmp ebx, eax // 7cb4 | jl 0xffffffb6 // 8b4608 | mov eax, dword ptr [esi + 8] // c644070401 | mov byte ptr [edi + eax + 4], 1 $sequence_3 = { 8bf8 85ff 897df8 0f84a7070000 ff35???????? } // n = 5, score = 200 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 897df8 | mov dword ptr [ebp - 8], edi // 0f84a7070000 | je 0x7ad // ff35???????? | $sequence_4 = { 0f8579040000 8b45f0 6a40 89850cffffff b8ad304000 2d00104000 } // n = 6, score = 200 // 0f8579040000 | jne 0x47f // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 6a40 | push 0x40 // 89850cffffff | mov dword ptr [ebp - 0xf4], eax // b8ad304000 | mov eax, 0x4030ad // 2d00104000 | sub eax, 0x401000 $sequence_5 = { 53 53 8d8dfcfeffff 53 51 6802000080 } // n = 6, score = 200 // 53 | push ebx // 53 | push ebx // 8d8dfcfeffff | lea ecx, [ebp - 0x104] // 53 | push ebx // 51 | push ecx // 6802000080 | push 0x80000002 $sequence_6 = { 56 57 8b7c2414 33f6 8b4110 } // n = 5, score = 200 // 56 | push esi // 57 | push edi // 8b7c2414 | mov edi, dword ptr [esp + 0x14] // 33f6 | xor esi, esi // 8b4110 | mov eax, dword ptr [ecx + 0x10] $sequence_7 = { 0fb74dd8 0fb745d6 03c8 0fb745d4 03c8 } // n = 5, score = 200 // 0fb74dd8 | movzx ecx, word ptr [ebp - 0x28] // 0fb745d6 | movzx eax, word ptr [ebp - 0x2a] // 03c8 | add ecx, eax // 0fb745d4 | movzx eax, word ptr [ebp - 0x2c] // 03c8 | add ecx, eax $sequence_8 = { bf00100000 8b45fc 8b00 85c0 7448 6a40 57 } // n = 7, score = 200 // bf00100000 | mov edi, 0x1000 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 7448 | je 0x4a // 6a40 | push 0x40 // 57 | push edi $sequence_9 = { c3 8b442408 8a08 84c9 7408 } // n = 5, score = 200 // c3 | ret // 8b442408 | mov eax, dword ptr [esp + 8] // 8a08 | mov cl, byte ptr [eax] // 84c9 | test cl, cl // 7408 | je 0xa condition: 7 of them and filesize < 24576 }
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