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rule win_newposthings_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { c20400 68f0110210 6a4c e8???????? 8bf0 } // n = 5, score = 100 // c20400 | ret 4 // 68f0110210 | push 0x100211f0 // 6a4c | push 0x4c // e8???????? | // 8bf0 | mov esi, eax $sequence_1 = { c78528ffffff00000000 c68518ffffff00 c645fc10 837d9010 720e ffb57cffffff } // n = 6, score = 100 // c78528ffffff00000000 | mov dword ptr [ebp - 0xd8], 0 // c68518ffffff00 | mov byte ptr [ebp - 0xe8], 0 // c645fc10 | mov byte ptr [ebp - 4], 0x10 // 837d9010 | cmp dword ptr [ebp - 0x70], 0x10 // 720e | jb 0x10 // ffb57cffffff | push dword ptr [ebp - 0x84] $sequence_2 = { 8b7de4 c3 6a04 b8bb4d0110 e8???????? e8???????? 83b89400000000 } // n = 7, score = 100 // 8b7de4 | mov edi, dword ptr [ebp - 0x1c] // c3 | ret // 6a04 | push 4 // b8bb4d0110 | mov eax, 0x10014dbb // e8???????? | // e8???????? | // 83b89400000000 | cmp dword ptr [eax + 0x94], 0 $sequence_3 = { 53 ff15???????? 85c0 750d 68e8030000 ffd7 46 } // n = 7, score = 100 // 53 | push ebx // ff15???????? | // 85c0 | test eax, eax // 750d | jne 0xf // 68e8030000 | push 0x3e8 // ffd7 | call edi // 46 | inc esi $sequence_4 = { eb13 80c980 884c3704 8b049d481d0210 8064302480 837d0800 5f } // n = 7, score = 100 // eb13 | jmp 0x15 // 80c980 | or cl, 0x80 // 884c3704 | mov byte ptr [edi + esi + 4], cl // 8b049d481d0210 | mov eax, dword ptr [ebx*4 + 0x10021d48] // 8064302480 | and byte ptr [eax + esi + 0x24], 0x80 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 5f | pop edi $sequence_5 = { 8886a0050210 46 ebe5 ff35???????? ff15???????? 85c0 7513 } // n = 7, score = 100 // 8886a0050210 | mov byte ptr [esi + 0x100205a0], al // 46 | inc esi // ebe5 | jmp 0xffffffe7 // ff35???????? | // ff15???????? | // 85c0 | test eax, eax // 7513 | jne 0x15 $sequence_6 = { c645fc03 68e8c40110 8d9568ffffff 8d8de4feffff e8???????? 83c404 c645fc04 } // n = 7, score = 100 // c645fc03 | mov byte ptr [ebp - 4], 3 // 68e8c40110 | push 0x1001c4e8 // 8d9568ffffff | lea edx, [ebp - 0x98] // 8d8de4feffff | lea ecx, [ebp - 0x11c] // e8???????? | // 83c404 | add esp, 4 // c645fc04 | mov byte ptr [ebp - 4], 4 $sequence_7 = { ff24859f564000 33c0 838de8fbffffff 8bd8 8985a0fbffff } // n = 5, score = 100 // ff24859f564000 | jmp dword ptr [eax*4 + 0x40569f] // 33c0 | xor eax, eax // 838de8fbffffff | or dword ptr [ebp - 0x418], 0xffffffff // 8bd8 | mov ebx, eax // 8985a0fbffff | mov dword ptr [ebp - 0x460], eax $sequence_8 = { 83c404 c645fc07 8d4d08 51 8bd0 8d4dc0 } // n = 6, score = 100 // 83c404 | add esp, 4 // c645fc07 | mov byte ptr [ebp - 4], 7 // 8d4d08 | lea ecx, [ebp + 8] // 51 | push ecx // 8bd0 | mov edx, eax // 8d4dc0 | lea ecx, [ebp - 0x40] $sequence_9 = { 50 8d8d40feffff e8???????? c745fc01000000 83bd50feffff00 752b 6a00 } // n = 7, score = 100 // 50 | push eax // 8d8d40feffff | lea ecx, [ebp - 0x1c0] // e8???????? | // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 83bd50feffff00 | cmp dword ptr [ebp - 0x1b0], 0 // 752b | jne 0x2d // 6a00 | push 0 condition: 7 of them and filesize < 827392 }
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