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rule win_newposthings_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.newposthings." 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.newposthings" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8a4601 3c30 7c04 3c39 7e0a 3c3d 7406 } // n = 7, score = 100 // 8a4601 | mov al, byte ptr [esi + 1] // 3c30 | cmp al, 0x30 // 7c04 | jl 6 // 3c39 | cmp al, 0x39 // 7e0a | jle 0xc // 3c3d | cmp al, 0x3d // 7406 | je 8 $sequence_1 = { 7423 3d00000400 7550 80c980 884c3704 8b0c9d481d0210 8a443124 } // n = 7, score = 100 // 7423 | je 0x25 // 3d00000400 | cmp eax, 0x40000 // 7550 | jne 0x52 // 80c980 | or cl, 0x80 // 884c3704 | mov byte ptr [edi + esi + 4], cl // 8b0c9d481d0210 | mov ecx, dword ptr [ebx*4 + 0x10021d48] // 8a443124 | mov al, byte ptr [ecx + esi + 0x24] $sequence_2 = { 83e61f 8b0485481d0210 c1e606 80643004fd 8b45f8 8b55fc 5f } // n = 7, score = 100 // 83e61f | and esi, 0x1f // 8b0485481d0210 | mov eax, dword ptr [eax*4 + 0x10021d48] // c1e606 | shl esi, 6 // 80643004fd | and byte ptr [eax + esi + 4], 0xfd // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b55fc | mov edx, dword ptr [ebp - 4] // 5f | pop edi $sequence_3 = { ff7510 ff750c 56 6843120110 e8???????? 83c418 85c0 } // n = 7, score = 100 // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] // 56 | push esi // 6843120110 | push 0x10011243 // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax $sequence_4 = { 83c602 663906 74f8 6a03 56 68548e0110 e8???????? } // n = 7, score = 100 // 83c602 | add esi, 2 // 663906 | cmp word ptr [esi], ax // 74f8 | je 0xfffffffa // 6a03 | push 3 // 56 | push esi // 68548e0110 | push 0x10018e54 // e8???????? | $sequence_5 = { 50 c644245c00 8bce e8???????? 8bf0 eb02 33f6 } // n = 7, score = 100 // 50 | push eax // c644245c00 | mov byte ptr [esp + 0x5c], 0 // 8bce | mov ecx, esi // e8???????? | // 8bf0 | mov esi, eax // eb02 | jmp 4 // 33f6 | xor esi, esi $sequence_6 = { e8???????? 50 8bcb e8???????? c745fc00000000 c745f001000000 8bc3 } // n = 7, score = 100 // e8???????? | // 50 | push eax // 8bcb | mov ecx, ebx // e8???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745f001000000 | mov dword ptr [ebp - 0x10], 1 // 8bc3 | mov eax, ebx $sequence_7 = { 8b049538f34500 47 ff3418 ff15???????? 85c0 750a ff15???????? } // n = 7, score = 100 // 8b049538f34500 | mov eax, dword ptr [edx*4 + 0x45f338] // 47 | inc edi // ff3418 | push dword ptr [eax + ebx] // ff15???????? | // 85c0 | test eax, eax // 750a | jne 0xc // ff15???????? | $sequence_8 = { 83c204 8955e0 eb86 890cb538f34500 } // n = 4, score = 100 // 83c204 | add edx, 4 // 8955e0 | mov dword ptr [ebp - 0x20], edx // eb86 | jmp 0xffffff88 // 890cb538f34500 | mov dword ptr [esi*4 + 0x45f338], ecx $sequence_9 = { e8???????? c745fc00000000 83ec18 8bcc 896588 6aff } // n = 6, score = 100 // e8???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 83ec18 | sub esp, 0x18 // 8bcc | mov ecx, esp // 896588 | mov dword ptr [ebp - 0x78], esp // 6aff | push -1 condition: 7 of them and filesize < 827392 }
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