Actor(s): UPS
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rule win_w32times_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.w32times." 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.w32times" 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 = { 33d7 25fcfcfcfc 81e2cfcfcfcf 8ad8 8acc c1ca04 8bab58714000 } // n = 7, score = 200 // 33d7 | xor edx, edi // 25fcfcfcfc | and eax, 0xfcfcfcfc // 81e2cfcfcfcf | and edx, 0xcfcfcfcf // 8ad8 | mov bl, al // 8acc | mov cl, ah // c1ca04 | ror edx, 4 // 8bab58714000 | mov ebp, dword ptr [ebx + 0x407158] $sequence_1 = { 50 ffd6 83c40c 85c0 7541 8b7504 83c504 } // n = 7, score = 200 // 50 | push eax // ffd6 | call esi // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7541 | jne 0x43 // 8b7504 | mov esi, dword ptr [ebp + 4] // 83c504 | add ebp, 4 $sequence_2 = { 81c46c010000 c3 8b4c2408 83ec10 8d442400 56 57 } // n = 7, score = 200 // 81c46c010000 | add esp, 0x16c // c3 | ret // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 83ec10 | sub esp, 0x10 // 8d442400 | lea eax, [esp] // 56 | push esi // 57 | push edi $sequence_3 = { c1ee04 c1e210 0bf2 2500ff0000 0bf0 } // n = 5, score = 200 // c1ee04 | shr esi, 4 // c1e210 | shl edx, 0x10 // 0bf2 | or esi, edx // 2500ff0000 | and eax, 0xff00 // 0bf0 | or esi, eax $sequence_4 = { 895c2414 f3ab 55 ff15???????? b909000000 8bf3 } // n = 6, score = 200 // 895c2414 | mov dword ptr [esp + 0x14], ebx // f3ab | rep stosd dword ptr es:[edi], eax // 55 | push ebp // ff15???????? | // b909000000 | mov ecx, 9 // 8bf3 | mov esi, ebx $sequence_5 = { 6a00 8d4c2448 6a02 51 } // n = 4, score = 200 // 6a00 | push 0 // 8d4c2448 | lea ecx, [esp + 0x48] // 6a02 | push 2 // 51 | push ecx $sequence_6 = { 8b9958784000 33f3 8b9858754000 33f3 8b9a58764000 33f3 8b4520 } // n = 7, score = 200 // 8b9958784000 | mov ebx, dword ptr [ecx + 0x407858] // 33f3 | xor esi, ebx // 8b9858754000 | mov ebx, dword ptr [eax + 0x407558] // 33f3 | xor esi, ebx // 8b9a58764000 | mov ebx, dword ptr [edx + 0x407658] // 33f3 | xor esi, ebx // 8b4520 | mov eax, dword ptr [ebp + 0x20] $sequence_7 = { 740a 683f000f00 6a00 56 eb09 683f000f00 6a00 } // n = 7, score = 200 // 740a | je 0xc // 683f000f00 | push 0xf003f // 6a00 | push 0 // 56 | push esi // eb09 | jmp 0xb // 683f000f00 | push 0xf003f // 6a00 | push 0 $sequence_8 = { 8b35???????? 53 ffd6 55 ffd6 68c8000000 ff15???????? } // n = 7, score = 200 // 8b35???????? | // 53 | push ebx // ffd6 | call esi // 55 | push ebp // ffd6 | call esi // 68c8000000 | push 0xc8 // ff15???????? | $sequence_9 = { 48 89442414 75d4 5e } // n = 4, score = 200 // 48 | dec eax // 89442414 | mov dword ptr [esp + 0x14], eax // 75d4 | jne 0xffffffd6 // 5e | pop esi condition: 7 of them and filesize < 122880 }
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