Actor(s): SideCopy
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rule win_action_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.action_rat." 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.action_rat" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8d4d0c e8???????? 8b4508 8b4df4 64890d00000000 59 5b } // n = 7, score = 100 // 8d4d0c | lea ecx, [ebp + 0xc] // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5b | pop ebx $sequence_1 = { 8b55f8 52 8b4dfc 83c134 e8???????? 8b00 50 } // n = 7, score = 100 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 52 | push edx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 83c134 | add ecx, 0x34 // e8???????? | // 8b00 | mov eax, dword ptr [eax] // 50 | push eax $sequence_2 = { 83c270 52 8b4dfc 83c170 } // n = 4, score = 100 // 83c270 | add edx, 0x70 // 52 | push edx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 83c170 | add ecx, 0x70 $sequence_3 = { e8???????? c745d400000000 eb09 8b4dd4 83c101 894dd4 8d4d0c } // n = 7, score = 100 // e8???????? | // c745d400000000 | mov dword ptr [ebp - 0x2c], 0 // eb09 | jmp 0xb // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 83c101 | add ecx, 1 // 894dd4 | mov dword ptr [ebp - 0x2c], ecx // 8d4d0c | lea ecx, [ebp + 0xc] $sequence_4 = { 7420 0fb645fb 50 8b4df4 8b4918 e8???????? 0fb6d0 } // n = 7, score = 100 // 7420 | je 0x22 // 0fb645fb | movzx eax, byte ptr [ebp - 5] // 50 | push eax // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8b4918 | mov ecx, dword ptr [ecx + 0x18] // e8???????? | // 0fb6d0 | movzx edx, al $sequence_5 = { 0fb74202 50 ff15???????? 0fb7c8 8b5514 890a } // n = 6, score = 100 // 0fb74202 | movzx eax, word ptr [edx + 2] // 50 | push eax // ff15???????? | // 0fb7c8 | movzx ecx, ax // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 890a | mov dword ptr [edx], ecx $sequence_6 = { 6a00 8b45fc 50 8b4d08 51 e8???????? 83c418 } // n = 7, score = 100 // 6a00 | push 0 // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // e8???????? | // 83c418 | add esp, 0x18 $sequence_7 = { e8???????? 8d8ddcfbffff e8???????? c645fc0e 6a00 68e0930400 6a00 } // n = 7, score = 100 // e8???????? | // 8d8ddcfbffff | lea ecx, [ebp - 0x424] // e8???????? | // c645fc0e | mov byte ptr [ebp - 4], 0xe // 6a00 | push 0 // 68e0930400 | push 0x493e0 // 6a00 | push 0 $sequence_8 = { 0de0000000 b901000000 6bd100 8b4d0c 880411 8b5508 c1fa06 } // n = 7, score = 100 // 0de0000000 | or eax, 0xe0 // b901000000 | mov ecx, 1 // 6bd100 | imul edx, ecx, 0 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 880411 | mov byte ptr [ecx + edx], al // 8b5508 | mov edx, dword ptr [ebp + 8] // c1fa06 | sar edx, 6 $sequence_9 = { 8b4df4 3b4df8 750b 68???????? ff15???????? 8b55ec 833a22 } // n = 7, score = 100 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 3b4df8 | cmp ecx, dword ptr [ebp - 8] // 750b | jne 0xd // 68???????? | // ff15???????? | // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 833a22 | cmp dword ptr [edx], 0x22 condition: 7 of them and filesize < 480256 }
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