Actor(s): TA410
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rule win_lookback_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.lookback." 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.lookback" 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 = { 53 8944241a 57 66894c2416 89442422 8bfa } // n = 6, score = 200 // 53 | push ebx // 8944241a | mov dword ptr [esp + 0x1a], eax // 57 | push edi // 66894c2416 | mov word ptr [esp + 0x16], cx // 89442422 | mov dword ptr [esp + 0x22], eax // 8bfa | mov edi, edx $sequence_1 = { 8b7c241c 33ed 8b473c 8b443878 03c7 8b5024 } // n = 6, score = 200 // 8b7c241c | mov edi, dword ptr [esp + 0x1c] // 33ed | xor ebp, ebp // 8b473c | mov eax, dword ptr [edi + 0x3c] // 8b443878 | mov eax, dword ptr [eax + edi + 0x78] // 03c7 | add eax, edi // 8b5024 | mov edx, dword ptr [eax + 0x24] $sequence_2 = { 55 8bec 51 53 c745fc00000000 b801000000 } // n = 6, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 53 | push ebx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // b801000000 | mov eax, 1 $sequence_3 = { c3 5e 5d 33c0 5b 81c410070000 c3 } // n = 7, score = 200 // c3 | ret // 5e | pop esi // 5d | pop ebp // 33c0 | xor eax, eax // 5b | pop ebx // 81c410070000 | add esp, 0x710 // c3 | ret $sequence_4 = { 3c01 893d???????? 893d???????? 752e } // n = 4, score = 200 // 3c01 | cmp al, 1 // 893d???????? | // 893d???????? | // 752e | jne 0x30 $sequence_5 = { c644240800 88442415 e8???????? 8d4c240c 89442408 51 } // n = 6, score = 200 // c644240800 | mov byte ptr [esp + 8], 0 // 88442415 | mov byte ptr [esp + 0x15], al // e8???????? | // 8d4c240c | lea ecx, [esp + 0xc] // 89442408 | mov dword ptr [esp + 8], eax // 51 | push ecx $sequence_6 = { 8d5108 d1e8 85c0 7e33 } // n = 4, score = 200 // 8d5108 | lea edx, [ecx + 8] // d1e8 | shr eax, 1 // 85c0 | test eax, eax // 7e33 | jle 0x35 $sequence_7 = { 74a7 8b06 85c0 757b } // n = 4, score = 200 // 74a7 | je 0xffffffa9 // 8b06 | mov eax, dword ptr [esi] // 85c0 | test eax, eax // 757b | jne 0x7d $sequence_8 = { 52 8d442418 57 50 68???????? 57 57 } // n = 7, score = 200 // 52 | push edx // 8d442418 | lea eax, [esp + 0x18] // 57 | push edi // 50 | push eax // 68???????? | // 57 | push edi // 57 | push edi $sequence_9 = { 55 8bec 51 53 c745fc00000000 b801000000 0fa2 } // n = 7, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 53 | push ebx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // b801000000 | mov eax, 1 // 0fa2 | cpuid condition: 7 of them and filesize < 131072 }
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