Actor(s): TA410
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rule win_lookback_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 0f8407020000 8b35???????? 57 57 57 } // n = 5, score = 200 // 0f8407020000 | je 0x20d // 8b35???????? | // 57 | push edi // 57 | push edi // 57 | push edi $sequence_1 = { 56 57 8b7c2418 8b473c 8b8c38a0000000 } // n = 5, score = 200 // 56 | push esi // 57 | push edi // 8b7c2418 | mov edi, dword ptr [esp + 0x18] // 8b473c | mov eax, dword ptr [edi + 0x3c] // 8b8c38a0000000 | mov ecx, dword ptr [eax + edi + 0xa0] $sequence_2 = { 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_3 = { 8bc3 7446 83b89001000006 7514 } // n = 4, score = 200 // 8bc3 | mov eax, ebx // 7446 | je 0x48 // 83b89001000006 | cmp dword ptr [eax + 0x190], 6 // 7514 | jne 0x16 $sequence_4 = { 57 8945fc 8945f8 60 648b1d18000000 64a130000000 8b98a8000000 } // n = 7, score = 200 // 57 | push edi // 8945fc | mov dword ptr [ebp - 4], eax // 8945f8 | mov dword ptr [ebp - 8], eax // 60 | pushal // 648b1d18000000 | mov ebx, dword ptr fs:[0x18] // 64a130000000 | mov eax, dword ptr fs:[0x30] // 8b98a8000000 | mov ebx, dword ptr [eax + 0xa8] $sequence_5 = { 0f8407020000 8b35???????? 57 57 57 57 ffd6 } // n = 7, score = 200 // 0f8407020000 | je 0x20d // 8b35???????? | // 57 | push edi // 57 | push edi // 57 | push edi // 57 | push edi // ffd6 | call esi $sequence_6 = { 72e4 53 55 33c0 56 } // n = 5, score = 200 // 72e4 | jb 0xffffffe6 // 53 | push ebx // 55 | push ebp // 33c0 | xor eax, eax // 56 | push esi $sequence_7 = { 83ec08 53 33c0 56 57 8945fc 8945f8 } // n = 7, score = 200 // 83ec08 | sub esp, 8 // 53 | push ebx // 33c0 | xor eax, eax // 56 | push esi // 57 | push edi // 8945fc | mov dword ptr [ebp - 4], eax // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_8 = { 8b1d???????? 8b35???????? a1???????? 3bc7 740d 50 } // n = 6, score = 200 // 8b1d???????? | // 8b35???????? | // a1???????? | // 3bc7 | cmp eax, edi // 740d | je 0xf // 50 | push eax $sequence_9 = { e8???????? 83c40c 89442412 be???????? } // n = 4, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 89442412 | mov dword ptr [esp + 0x12], eax // be???????? | condition: 7 of them and filesize < 131072 }
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