Actor(s): TA410
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rule win_lookback_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { c644241b00 895c2430 895c242c 895c241c } // n = 4, score = 200 // c644241b00 | mov byte ptr [esp + 0x1b], 0 // 895c2430 | mov dword ptr [esp + 0x30], ebx // 895c242c | mov dword ptr [esp + 0x2c], ebx // 895c241c | mov dword ptr [esp + 0x1c], ebx $sequence_1 = { 25ffffff0f eb09 8b16 8bc7 } // n = 4, score = 200 // 25ffffff0f | and eax, 0xfffffff // eb09 | jmp 0xb // 8b16 | mov edx, dword ptr [esi] // 8bc7 | mov eax, edi $sequence_2 = { 50 ff15???????? 893d???????? 8b0d???????? } // n = 4, score = 200 // 50 | push eax // ff15???????? | // 893d???????? | // 8b0d???????? | $sequence_3 = { 02d3 8854240c 8b74240c 81e6ff000000 } // n = 4, score = 200 // 02d3 | add dl, bl // 8854240c | mov byte ptr [esp + 0xc], dl // 8b74240c | mov esi, dword ptr [esp + 0xc] // 81e6ff000000 | and esi, 0xff $sequence_4 = { c705????????00000000 5f b801000000 5b 83c420 c3 } // n = 6, score = 200 // c705????????00000000 | // 5f | pop edi // b801000000 | mov eax, 1 // 5b | pop ebx // 83c420 | add esp, 0x20 // c3 | ret $sequence_5 = { 5d 5b 59 c3 0594010000 8b08 894d00 } // n = 7, score = 200 // 5d | pop ebp // 5b | pop ebx // 59 | pop ecx // c3 | ret // 0594010000 | add eax, 0x194 // 8b08 | mov ecx, dword ptr [eax] // 894d00 | mov dword ptr [ebp], ecx $sequence_6 = { 8b1d???????? 8b35???????? a1???????? 3bc7 740d 50 } // n = 6, score = 200 // 8b1d???????? | // 8b35???????? | // a1???????? | // 3bc7 | cmp eax, edi // 740d | je 0xf // 50 | push eax $sequence_7 = { 52 ffd6 8b442414 3bc7 0f8472010000 } // n = 5, score = 200 // 52 | push edx // ffd6 | call esi // 8b442414 | mov eax, dword ptr [esp + 0x14] // 3bc7 | cmp eax, edi // 0f8472010000 | je 0x178 $sequence_8 = { 8b02 8b742420 03c7 8a18 } // n = 4, score = 200 // 8b02 | mov eax, dword ptr [edx] // 8b742420 | mov esi, dword ptr [esp + 0x20] // 03c7 | add eax, edi // 8a18 | mov bl, byte ptr [eax] $sequence_9 = { 8945f8 60 648b1d18000000 64a130000000 } // n = 4, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 60 | pushal // 648b1d18000000 | mov ebx, dword ptr fs:[0x18] // 64a130000000 | mov eax, dword ptr fs:[0x30] condition: 7 of them and filesize < 131072 }
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