Actor(s): SideCopy
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rule win_action_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { eb64 68???????? 8b4d0c 51 e8???????? } // n = 5, score = 100 // eb64 | jmp 0x66 // 68???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 51 | push ecx // e8???????? | $sequence_1 = { 0f8596010000 8d4dc8 e8???????? 0fb6c0 85c0 752d } // n = 6, score = 100 // 0f8596010000 | jne 0x19c // 8d4dc8 | lea ecx, [ebp - 0x38] // e8???????? | // 0fb6c0 | movzx eax, al // 85c0 | test eax, eax // 752d | jne 0x2f $sequence_2 = { 7409 c745e800000000 eb0c 8b4dfc ff15???????? 8945e8 } // n = 6, score = 100 // 7409 | je 0xb // c745e800000000 | mov dword ptr [ebp - 0x18], 0 // eb0c | jmp 0xe // 8b4dfc | mov ecx, dword ptr [ebp - 4] // ff15???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax $sequence_3 = { e8???????? 8945f8 8b4dfc 51 8b4df8 e8???????? 8d4dd0 } // n = 7, score = 100 // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | // 8d4dd0 | lea ecx, [ebp - 0x30] $sequence_4 = { 8d8de4f7ffff e8???????? 50 e8???????? 83c414 8985d4f7ffff 83bdd4f7ffff00 } // n = 7, score = 100 // 8d8de4f7ffff | lea ecx, [ebp - 0x81c] // e8???????? | // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 // 8985d4f7ffff | mov dword ptr [ebp - 0x82c], eax // 83bdd4f7ffff00 | cmp dword ptr [ebp - 0x82c], 0 $sequence_5 = { 7527 c645af00 c645fc00 8d4db8 e8???????? c745fcffffffff 8d4d0c } // n = 7, score = 100 // 7527 | jne 0x29 // c645af00 | mov byte ptr [ebp - 0x51], 0 // c645fc00 | mov byte ptr [ebp - 4], 0 // 8d4db8 | lea ecx, [ebp - 0x48] // e8???????? | // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff // 8d4d0c | lea ecx, [ebp + 0xc] $sequence_6 = { 8bf4 8965f0 8b4d08 51 e8???????? 83c404 50 } // n = 7, score = 100 // 8bf4 | mov esi, esp // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 50 | push eax $sequence_7 = { 8b4d08 8b11 8b4d08 034a04 ff15???????? 83e801 83da00 } // n = 7, score = 100 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b11 | mov edx, dword ptr [ecx] // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 034a04 | add ecx, dword ptr [edx + 4] // ff15???????? | // 83e801 | sub eax, 1 // 83da00 | sbb edx, 0 $sequence_8 = { 7209 c745d803000000 eb0b 8b4df8 83e901 d1e9 894dd8 } // n = 7, score = 100 // 7209 | jb 0xb // c745d803000000 | mov dword ptr [ebp - 0x28], 3 // eb0b | jmp 0xd // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 83e901 | sub ecx, 1 // d1e9 | shr ecx, 1 // 894dd8 | mov dword ptr [ebp - 0x28], ecx $sequence_9 = { 68c8000000 e8???????? 83c404 8945f0 c745fc00000000 837df000 7420 } // n = 7, score = 100 // 68c8000000 | push 0xc8 // e8???????? | // 83c404 | add esp, 4 // 8945f0 | mov dword ptr [ebp - 0x10], eax // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 7420 | je 0x22 condition: 7 of them and filesize < 480256 }
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