Actor(s): APT 30
There is no description at this point.
rule win_rctrl_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.rctrl." 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.rctrl" 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 = { 8bf0 85f6 0f845ffdffff 83a57cfeffff00 8b0d???????? 85c9 7412 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 0f845ffdffff | je 0xfffffd65 // 83a57cfeffff00 | and dword ptr [ebp - 0x184], 0 // 8b0d???????? | // 85c9 | test ecx, ecx // 7412 | je 0x14 $sequence_1 = { 85c0 7506 8b5ddc 43 eb02 33db 6a00 } // n = 7, score = 100 // 85c0 | test eax, eax // 7506 | jne 8 // 8b5ddc | mov ebx, dword ptr [ebp - 0x24] // 43 | inc ebx // eb02 | jmp 4 // 33db | xor ebx, ebx // 6a00 | push 0 $sequence_2 = { 8b8758010000 8b80c0000000 89837c0d0000 8b33 8b45f0 51 83c830 } // n = 7, score = 100 // 8b8758010000 | mov eax, dword ptr [edi + 0x158] // 8b80c0000000 | mov eax, dword ptr [eax + 0xc0] // 89837c0d0000 | mov dword ptr [ebx + 0xd7c], eax // 8b33 | mov esi, dword ptr [ebx] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 51 | push ecx // 83c830 | or eax, 0x30 $sequence_3 = { 8b4020 eb02 33c0 89415c 8b8bb0000000 85c9 } // n = 6, score = 100 // 8b4020 | mov eax, dword ptr [eax + 0x20] // eb02 | jmp 4 // 33c0 | xor eax, eax // 89415c | mov dword ptr [ecx + 0x5c], eax // 8b8bb0000000 | mov ecx, dword ptr [ebx + 0xb0] // 85c9 | test ecx, ecx $sequence_4 = { 50 e8???????? 8b7b78 8b07 8b7060 8bce e8???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8b7b78 | mov edi, dword ptr [ebx + 0x78] // 8b07 | mov eax, dword ptr [edi] // 8b7060 | mov esi, dword ptr [eax + 0x60] // 8bce | mov ecx, esi // e8???????? | $sequence_5 = { 8bb048030000 8bce e8???????? 8bcb ffd6 8bb574ffffff e9???????? } // n = 7, score = 100 // 8bb048030000 | mov esi, dword ptr [eax + 0x348] // 8bce | mov ecx, esi // e8???????? | // 8bcb | mov ecx, ebx // ffd6 | call esi // 8bb574ffffff | mov esi, dword ptr [ebp - 0x8c] // e9???????? | $sequence_6 = { 8985c8f6ffff 0f852cfcffff 8b95b4f6ffff 85d2 0f843d010000 8b0495b4155a00 8985ccf6ffff } // n = 7, score = 100 // 8985c8f6ffff | mov dword ptr [ebp - 0x938], eax // 0f852cfcffff | jne 0xfffffc32 // 8b95b4f6ffff | mov edx, dword ptr [ebp - 0x94c] // 85d2 | test edx, edx // 0f843d010000 | je 0x143 // 8b0495b4155a00 | mov eax, dword ptr [edx*4 + 0x5a15b4] // 8985ccf6ffff | mov dword ptr [ebp - 0x934], eax $sequence_7 = { 8bf8 8b838c000000 897df8 59 59 85c0 } // n = 6, score = 100 // 8bf8 | mov edi, eax // 8b838c000000 | mov eax, dword ptr [ebx + 0x8c] // 897df8 | mov dword ptr [ebp - 8], edi // 59 | pop ecx // 59 | pop ecx // 85c0 | test eax, eax $sequence_8 = { 8b7074 eb06 8bb084000000 8d4de0 c745e0fc525700 e8???????? 8bc6 } // n = 7, score = 100 // 8b7074 | mov esi, dword ptr [eax + 0x74] // eb06 | jmp 8 // 8bb084000000 | mov esi, dword ptr [eax + 0x84] // 8d4de0 | lea ecx, [ebp - 0x20] // c745e0fc525700 | mov dword ptr [ebp - 0x20], 0x5752fc // e8???????? | // 8bc6 | mov eax, esi $sequence_9 = { 8d4610 8907 8bc7 5b 5f 5e 5d } // n = 7, score = 100 // 8d4610 | lea eax, [esi + 0x10] // 8907 | mov dword ptr [edi], eax // 8bc7 | mov eax, edi // 5b | pop ebx // 5f | pop edi // 5e | pop esi // 5d | pop ebp condition: 7 of them and filesize < 4315136 }
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