Actor(s): ProjectSauron
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rule win_remsec_strider_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.remsec_strider." 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.remsec_strider" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d85e8fdffff 50 ff15???????? 894628 } // n = 4, score = 200 // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // ff15???????? | // 894628 | mov dword ptr [esi + 0x28], eax $sequence_1 = { e8???????? ff761c ff15???????? 83c410 83661c00 83661400 8bce } // n = 7, score = 200 // e8???????? | // ff761c | push dword ptr [esi + 0x1c] // ff15???????? | // 83c410 | add esp, 0x10 // 83661c00 | and dword ptr [esi + 0x1c], 0 // 83661400 | and dword ptr [esi + 0x14], 0 // 8bce | mov ecx, esi $sequence_2 = { 85c0 7444 8b4818 85c9 7405 } // n = 5, score = 200 // 85c0 | test eax, eax // 7444 | je 0x46 // 8b4818 | mov ecx, dword ptr [eax + 0x18] // 85c9 | test ecx, ecx // 7405 | je 7 $sequence_3 = { c20800 55 8bec 8b5508 83ec1c } // n = 5, score = 200 // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 8b5508 | mov edx, dword ptr [ebp + 8] // 83ec1c | sub esp, 0x1c $sequence_4 = { 85c9 740f 39481c 720a 68???????? e9???????? 8b4814 } // n = 7, score = 200 // 85c9 | test ecx, ecx // 740f | je 0x11 // 39481c | cmp dword ptr [eax + 0x1c], ecx // 720a | jb 0xc // 68???????? | // e9???????? | // 8b4814 | mov ecx, dword ptr [eax + 0x14] $sequence_5 = { c20800 33c0 ebf5 8b432c ff30 68???????? } // n = 6, score = 200 // c20800 | ret 8 // 33c0 | xor eax, eax // ebf5 | jmp 0xfffffff7 // 8b432c | mov eax, dword ptr [ebx + 0x2c] // ff30 | push dword ptr [eax] // 68???????? | $sequence_6 = { 33c0 c701???????? 394118 7509 894104 894108 89410c } // n = 7, score = 200 // 33c0 | xor eax, eax // c701???????? | // 394118 | cmp dword ptr [ecx + 0x18], eax // 7509 | jne 0xb // 894104 | mov dword ptr [ecx + 4], eax // 894108 | mov dword ptr [ecx + 8], eax // 89410c | mov dword ptr [ecx + 0xc], eax $sequence_7 = { 6800040000 50 ff15???????? 83c410 33c0 5f 5e } // n = 7, score = 200 // 6800040000 | push 0x400 // 50 | push eax // ff15???????? | // 83c410 | add esp, 0x10 // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi $sequence_8 = { 83661c00 83661400 8bce 5e e9???????? } // n = 5, score = 200 // 83661c00 | and dword ptr [esi + 0x1c], 0 // 83661400 | and dword ptr [esi + 0x14], 0 // 8bce | mov ecx, esi // 5e | pop esi // e9???????? | $sequence_9 = { ff772c ff15???????? 85c0 7512 } // n = 4, score = 200 // ff772c | push dword ptr [edi + 0x2c] // ff15???????? | // 85c0 | test eax, eax // 7512 | jne 0x14 condition: 7 of them and filesize < 344064 }
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