Actor(s): DragonOK, Samurai Panda
There is no description at this point.
rule win_isspace_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.isspace." 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.isspace" 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 = { 57 50 8d45f0 64a300000000 8965e8 c745fc00000000 c785505cffff00a20000 } // n = 7, score = 200 // 57 | push edi // 50 | push eax // 8d45f0 | lea eax, [ebp - 0x10] // 64a300000000 | mov dword ptr fs:[0], eax // 8965e8 | mov dword ptr [ebp - 0x18], esp // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c785505cffff00a20000 | mov dword ptr [ebp - 0xa3b0], 0xa200 $sequence_1 = { 46 8bc6 c1e004 03c6 } // n = 4, score = 200 // 46 | inc esi // 8bc6 | mov eax, esi // c1e004 | shl eax, 4 // 03c6 | add eax, esi $sequence_2 = { ff15???????? 50 eb05 68???????? 68???????? ff15???????? } // n = 6, score = 200 // ff15???????? | // 50 | push eax // eb05 | jmp 7 // 68???????? | // 68???????? | // ff15???????? | $sequence_3 = { 6800010000 8d8600010000 6a00 50 e8???????? 83c418 8bc6 } // n = 7, score = 200 // 6800010000 | push 0x100 // 8d8600010000 | lea eax, [esi + 0x100] // 6a00 | push 0 // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 8bc6 | mov eax, esi $sequence_4 = { e8???????? 83c418 83c60a 56 } // n = 4, score = 200 // e8???????? | // 83c418 | add esp, 0x18 // 83c60a | add esi, 0xa // 56 | push esi $sequence_5 = { 85c0 7507 68???????? eb04 83c007 } // n = 5, score = 200 // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | // eb04 | jmp 6 // 83c007 | add eax, 7 $sequence_6 = { c78548ffffff9c000000 e8???????? 8ad8 c745fc00000000 } // n = 4, score = 200 // c78548ffffff9c000000 | mov dword ptr [ebp - 0xb8], 0x9c // e8???????? | // 8ad8 | mov bl, al // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_7 = { eb0a 6a00 6a23 eb04 6a00 } // n = 5, score = 200 // eb0a | jmp 0xc // 6a00 | push 0 // 6a23 | push 0x23 // eb04 | jmp 6 // 6a00 | push 0 condition: 7 of them and filesize < 434176 }
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