Actor(s): Boss Spider
There is no description at this point.
rule win_samsam_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-04-21" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.3.1" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.samsam" malpedia_version = "20200421" 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 = { 082b c883e10f 03c1 1bc9 0bc1 59 e9???????? } // n = 7, score = 200 // 082b | or byte ptr [ebx], ch // c883e10f | enter -0x1e7d, 0xf // 03c1 | add eax, ecx // 1bc9 | sbb ecx, ecx // 0bc1 | or eax, ecx // 59 | pop ecx // e9???????? | $sequence_1 = { ec 8b4508 56 33f6 3bc6 751d e8???????? } // n = 7, score = 200 // ec | in al, dx // 8b4508 | mov eax, dword ptr [ebp + 8] // 56 | push esi // 33f6 | xor esi, esi // 3bc6 | cmp eax, esi // 751d | jne 0x1f // e8???????? | $sequence_2 = { ec 83ec10 53 ff7510 8d4df0 e8???????? } // n = 6, score = 100 // ec | in al, dx // 83ec10 | sub esp, 0x10 // 53 | push ebx // ff7510 | push dword ptr [ebp + 0x10] // 8d4df0 | lea ecx, [ebp - 0x10] // e8???????? | $sequence_3 = { ec 83ec10 53 33db 56 57 } // n = 6, score = 100 // ec | in al, dx // 83ec10 | sub esp, 0x10 // 53 | push ebx // 33db | xor ebx, ebx // 56 | push esi // 57 | push edi $sequence_4 = { ec 6a0a 6a00 ff7508 e8???????? } // n = 5, score = 100 // ec | in al, dx // 6a0a | push 0xa // 6a00 | push 0 // ff7508 | push dword ptr [ebp + 8] // e8???????? | condition: 7 of them and filesize < 483328 }
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