Actor(s): ProjectSauron
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rule win_remsec_strider_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 83e903 752a 6a02 58 } // n = 4, score = 200 // 83e903 | sub ecx, 3 // 752a | jne 0x2c // 6a02 | push 2 // 58 | pop eax $sequence_1 = { 33c0 40 8901 894108 } // n = 4, score = 200 // 33c0 | xor eax, eax // 40 | inc eax // 8901 | mov dword ptr [ecx], eax // 894108 | mov dword ptr [ecx + 8], eax $sequence_2 = { c21000 55 8bec 8b5508 83ec1c } // n = 5, score = 200 // c21000 | ret 0x10 // 55 | push ebp // 8bec | mov ebp, esp // 8b5508 | mov edx, dword ptr [ebp + 8] // 83ec1c | sub esp, 0x1c $sequence_3 = { 83460810 33c0 5e 40 5b 8be5 5d } // n = 7, score = 200 // 83460810 | add dword ptr [esi + 8], 0x10 // 33c0 | xor eax, eax // 5e | pop esi // 40 | inc eax // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_4 = { eb0a dec9 eb06 dee9 eb02 dec1 } // n = 6, score = 200 // eb0a | jmp 0xc // dec9 | fmulp st(1) // eb06 | jmp 8 // dee9 | fsubp st(1) // eb02 | jmp 4 // dec1 | faddp st(1) $sequence_5 = { 56 ff5058 59 6a01 } // n = 4, score = 200 // 56 | push esi // ff5058 | call dword ptr [eax + 0x58] // 59 | pop ecx // 6a01 | push 1 $sequence_6 = { 7406 8b01 6a01 ff10 83a68000000000 eb32 } // n = 6, score = 200 // 7406 | je 8 // 8b01 | mov eax, dword ptr [ecx] // 6a01 | push 1 // ff10 | call dword ptr [eax] // 83a68000000000 | and dword ptr [esi + 0x80], 0 // eb32 | jmp 0x34 $sequence_7 = { 85ff 75e1 8b4604 85c0 } // n = 4, score = 200 // 85ff | test edi, edi // 75e1 | jne 0xffffffe3 // 8b4604 | mov eax, dword ptr [esi + 4] // 85c0 | test eax, eax $sequence_8 = { 668908 830602 5e 5b c9 c3 } // n = 6, score = 200 // 668908 | mov word ptr [eax], cx // 830602 | add dword ptr [esi], 2 // 5e | pop esi // 5b | pop ebx // c9 | leave // c3 | ret $sequence_9 = { 897df0 8975f4 e8???????? 5e 5f } // n = 5, score = 200 // 897df0 | mov dword ptr [ebp - 0x10], edi // 8975f4 | mov dword ptr [ebp - 0xc], esi // e8???????? | // 5e | pop esi // 5f | pop edi condition: 7 of them and filesize < 344064 }
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