Actor(s): APT33
There is no description at this point.
rule win_shapeshift_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.shapeshift." 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.shapeshift" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 6a01 b9???????? e8???????? 68f0f1ffff b9???????? e8???????? c705????????c0f44100 } // n = 7, score = 100 // 6a01 | push 1 // b9???????? | // e8???????? | // 68f0f1ffff | push 0xfffff1f0 // b9???????? | // e8???????? | // c705????????c0f44100 | $sequence_1 = { 25fe030000 f20f592c8550b44100 f20f59148550b44100 660f5834c560bc4100 660f54c5 f20f5ce8 } // n = 6, score = 100 // 25fe030000 | and eax, 0x3fe // f20f592c8550b44100 | mulsd xmm5, qword ptr [eax*4 + 0x41b450] // f20f59148550b44100 | mulsd xmm2, qword ptr [eax*4 + 0x41b450] // 660f5834c560bc4100 | addpd xmm6, xmmword ptr [eax*8 + 0x41bc60] // 660f54c5 | andpd xmm0, xmm5 // f20f5ce8 | subsd xmm5, xmm0 $sequence_2 = { eb24 8b048dc4fc4100 41 50 890d???????? } // n = 5, score = 100 // eb24 | jmp 0x26 // 8b048dc4fc4100 | mov eax, dword ptr [ecx*4 + 0x41fcc4] // 41 | inc ecx // 50 | push eax // 890d???????? | $sequence_3 = { 83c410 8b35???????? 53 57 ffd6 } // n = 5, score = 100 // 83c410 | add esp, 0x10 // 8b35???????? | // 53 | push ebx // 57 | push edi // ffd6 | call esi $sequence_4 = { 68???????? 8bf0 ffd3 03f0 33c9 } // n = 5, score = 100 // 68???????? | // 8bf0 | mov esi, eax // ffd3 | call ebx // 03f0 | add esi, eax // 33c9 | xor ecx, ecx $sequence_5 = { e8???????? 83c404 ff750c ff15???????? 6a02 } // n = 5, score = 100 // e8???????? | // 83c404 | add esp, 4 // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 6a02 | push 2 $sequence_6 = { e9???????? c745e04c804100 e9???????? c745dc02000000 c745e04c804100 8b4508 } // n = 6, score = 100 // e9???????? | // c745e04c804100 | mov dword ptr [ebp - 0x20], 0x41804c // e9???????? | // c745dc02000000 | mov dword ptr [ebp - 0x24], 2 // c745e04c804100 | mov dword ptr [ebp - 0x20], 0x41804c // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_7 = { 884a01 0fbf0d???????? 0fb689589a4100 884a02 } // n = 4, score = 100 // 884a01 | mov byte ptr [edx + 1], cl // 0fbf0d???????? | // 0fb689589a4100 | movzx ecx, byte ptr [ecx + 0x419a58] // 884a02 | mov byte ptr [edx + 2], cl condition: 7 of them and filesize < 303104 }
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