Unnamed ransomware that camouflages as a program performing system cleanup called "System Analyzer Pro".
rule win_unidentified_030_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2018-11-23" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator 0.1a" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.unidentified_030" malpedia_version = "20180607" 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 / approach will be published in the near future 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 = { 76ff d7 c3 76ff } // n = 4, score = 1000 // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503e $sequence_1 = { c3 76ff d7 c3 } // n = 4, score = 1000 // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret $sequence_2 = { d7 c3 76ff d7 } // n = 4, score = 1000 // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb $sequence_3 = { e7ff d7 c3 76ff } // n = 4, score = 1000 // e7ff | out -1, eax // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a $sequence_4 = { c3 76ff d7 c3 76ff } // n = 5, score = 1000 // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503e $sequence_5 = { d7 c3 76ff d7 c3 } // n = 5, score = 1000 // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret $sequence_6 = { e7ff d7 c3 76ff d7 } // n = 5, score = 1000 // e7ff | out -1, eax // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb $sequence_7 = { 76ff d7 c3 76ff d7 } // n = 5, score = 1000 // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503e // d7 | xlatb $sequence_8 = { e7ff d7 c3 76ff d7 c3 } // n = 6, score = 1000 // e7ff | out -1, eax // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret $sequence_9 = { d7 c3 76ff d7 c3 76ff } // n = 6, score = 1000 // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503a // d7 | xlatb // c3 | ret // 76ff | jbe 0x43503e condition: 7 of them and filesize < 800000 }
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