Actor(s): ProjectSauron
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rule win_remsec_strider_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 7509 834dfcff e9???????? 834dfcff 833f01 } // n = 5, score = 200 // 7509 | jne 0xb // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // e9???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 833f01 | cmp dword ptr [edi], 1 $sequence_1 = { 59 894808 db442404 83460810 } // n = 4, score = 200 // 59 | pop ecx // 894808 | mov dword ptr [eax + 8], ecx // db442404 | fild dword ptr [esp + 4] // 83460810 | add dword ptr [esi + 8], 0x10 $sequence_2 = { 83f97b 750b 6a06 58 c3 } // n = 5, score = 200 // 83f97b | cmp ecx, 0x7b // 750b | jne 0xd // 6a06 | push 6 // 58 | pop eax // c3 | ret $sequence_3 = { 33f6 46 3bc7 7e02 8bc7 } // n = 5, score = 200 // 33f6 | xor esi, esi // 46 | inc esi // 3bc7 | cmp eax, edi // 7e02 | jle 4 // 8bc7 | mov eax, edi $sequence_4 = { 59 eb02 33c9 f7d8 } // n = 4, score = 200 // 59 | pop ecx // eb02 | jmp 4 // 33c9 | xor ecx, ecx // f7d8 | neg eax $sequence_5 = { e8???????? 85c0 7502 5e c3 8b4e10 83665000 } // n = 7, score = 200 // e8???????? | // 85c0 | test eax, eax // 7502 | jne 4 // 5e | pop esi // c3 | ret // 8b4e10 | mov ecx, dword ptr [esi + 0x10] // 83665000 | and dword ptr [esi + 0x50], 0 $sequence_6 = { 8b4010 eb02 33c0 56 ffd0 59 } // n = 6, score = 200 // 8b4010 | mov eax, dword ptr [eax + 0x10] // eb02 | jmp 4 // 33c0 | xor eax, eax // 56 | push esi // ffd0 | call eax // 59 | pop ecx $sequence_7 = { 8b7008 eb27 837e5000 8b8754020000 894644 7409 } // n = 6, score = 200 // 8b7008 | mov esi, dword ptr [eax + 8] // eb27 | jmp 0x29 // 837e5000 | cmp dword ptr [esi + 0x50], 0 // 8b8754020000 | mov eax, dword ptr [edi + 0x254] // 894644 | mov dword ptr [esi + 0x44], eax // 7409 | je 0xb $sequence_8 = { 6808040000 8d461c 6a00 50 c706???????? e8???????? 83c40c } // n = 7, score = 200 // 6808040000 | push 0x408 // 8d461c | lea eax, dword ptr [esi + 0x1c] // 6a00 | push 0 // 50 | push eax // c706???????? | // e8???????? | // 83c40c | add esp, 0xc $sequence_9 = { 8bc3 c1e008 83c842 50 } // n = 4, score = 200 // 8bc3 | mov eax, ebx // c1e008 | shl eax, 8 // 83c842 | or eax, 0x42 // 50 | push eax condition: 7 of them and filesize < 344064 }
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