Custom RAT developed by the BlackTech actor, based on the Gh0st RAT.
rule win_gh0sttimes_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.gh0sttimes." 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.gh0sttimes" 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 = { 8b5508 83c009 50 8bcf e8???????? 57 8bf0 } // n = 7, score = 800 // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c009 | add eax, 9 // 50 | push eax // 8bcf | mov ecx, edi // e8???????? | // 57 | push edi // 8bf0 | mov esi, eax $sequence_1 = { 6a01 51 ff15???????? 8b7604 e8???????? } // n = 5, score = 800 // 6a01 | push 1 // 51 | push ecx // ff15???????? | // 8b7604 | mov esi, dword ptr [esi + 4] // e8???????? | $sequence_2 = { 8b1b 85db 0f8415020000 53 ffd7 } // n = 5, score = 800 // 8b1b | mov ebx, dword ptr [ebx] // 85db | test ebx, ebx // 0f8415020000 | je 0x21b // 53 | push ebx // ffd7 | call edi $sequence_3 = { 85c0 7527 8d55b8 52 8b55bc 8d45c0 50 } // n = 7, score = 800 // 85c0 | test eax, eax // 7527 | jne 0x29 // 8d55b8 | lea edx, [ebp - 0x48] // 52 | push edx // 8b55bc | mov edx, dword ptr [ebp - 0x44] // 8d45c0 | lea eax, [ebp - 0x40] // 50 | push eax $sequence_4 = { 52 e8???????? 83c420 32d2 } // n = 4, score = 800 // 52 | push edx // e8???????? | // 83c420 | add esp, 0x20 // 32d2 | xor dl, dl $sequence_5 = { c645ecdb c645ed50 c645ef62 8b55ec 8910 c645f07b } // n = 6, score = 800 // c645ecdb | mov byte ptr [ebp - 0x14], 0xdb // c645ed50 | mov byte ptr [ebp - 0x13], 0x50 // c645ef62 | mov byte ptr [ebp - 0x11], 0x62 // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 8910 | mov dword ptr [eax], edx // c645f07b | mov byte ptr [ebp - 0x10], 0x7b $sequence_6 = { 8985d8fdffff e8???????? 8bf0 83c404 89b5ccfdffff } // n = 5, score = 800 // 8985d8fdffff | mov dword ptr [ebp - 0x228], eax // e8???????? | // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 89b5ccfdffff | mov dword ptr [ebp - 0x234], esi $sequence_7 = { 50 0fb745ba 51 0fb74db8 52 } // n = 5, score = 800 // 50 | push eax // 0fb745ba | movzx eax, word ptr [ebp - 0x46] // 51 | push ecx // 0fb74db8 | movzx ecx, word ptr [ebp - 0x48] // 52 | push edx $sequence_8 = { 488b542440 488b5228 488b5210 488b4c2440 } // n = 4, score = 600 // 488b542440 | dec eax // 488b5228 | mov eax, dword ptr [esp + 0x20] // 488b5210 | mov ecx, dword ptr [eax + 0x38] // 488b4c2440 | dec eax $sequence_9 = { 488b542420 488b5210 488b8424a0000000 8b484c } // n = 4, score = 600 // 488b542420 | dec ecx // 488b5210 | mov dword ptr [ebx - 0x2f], eax // 488b8424a0000000 | dec ecx // 8b484c | mov dword ptr [ebx - 0x27], eax $sequence_10 = { 498943b9 498943c1 498943c9 498943d1 498943d9 4d8d43a0 } // n = 6, score = 600 // 498943b9 | dec ecx // 498943c1 | mov dword ptr [ebx - 0x47], eax // 498943c9 | dec ecx // 498943d1 | mov dword ptr [ebx - 0x3f], eax // 498943d9 | dec ecx // 4d8d43a0 | mov dword ptr [ebx - 0x37], eax $sequence_11 = { 488b542420 488b5230 488b442420 8b4838 } // n = 4, score = 600 // 488b542420 | mov ecx, dword ptr [eax + 0x4c] // 488b5230 | dec eax // 488b442420 | mov edx, dword ptr [esp + 0x20] // 8b4838 | dec eax $sequence_12 = { 488b542430 8b4260 4123c0 83c802 } // n = 4, score = 600 // 488b542430 | mov edx, dword ptr [edx + 0x30] // 8b4260 | dec eax // 4123c0 | mov eax, dword ptr [esp + 0x20] // 83c802 | mov ecx, dword ptr [eax + 0x38] $sequence_13 = { 488b542440 488b5228 488b5268 488b4c2440 } // n = 4, score = 600 // 488b542440 | mov ecx, dword ptr [esp + 0x40] // 488b5228 | dec eax // 488b5268 | mov edx, dword ptr [esp + 0x40] // 488b4c2440 | dec eax $sequence_14 = { 488b542440 488b5228 488b5260 488b4c2440 } // n = 4, score = 600 // 488b542440 | or eax, 2 // 488b5228 | mov dword ptr [edx + 0x60], eax // 488b5260 | dec eax // 488b4c2440 | mov eax, dword ptr [esp + 0x30] $sequence_15 = { 488b542440 488b5228 488b5250 488b4c2440 } // n = 4, score = 600 // 488b542440 | dec eax // 488b5228 | mov eax, dword ptr [edx + 0x30] // 488b5250 | movzx eax, byte ptr [eax + ecx] // 488b4c2440 | mov dword ptr [esp + 0x44], eax condition: 7 of them and filesize < 548864 }
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