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 = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { e8???????? 51 8d85e8fdffff 50 51 } // n = 5, score = 100 // e8???????? | // 51 | push ecx // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // 51 | push ecx $sequence_1 = { f7f1 8915???????? 8bc2 8b4df4 64890d00000000 59 8be5 } // n = 7, score = 100 // f7f1 | div ecx // 8915???????? | // 8bc2 | mov eax, edx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 8be5 | mov esp, ebp $sequence_2 = { ff15???????? 46 83fe05 72ea 8b4df8 } // n = 5, score = 100 // ff15???????? | // 46 | inc esi // 83fe05 | cmp esi, 5 // 72ea | jb 0xffffffec // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_3 = { 0fb689589a4100 8808 0fbf0d???????? 50 6a00 6a00 0fb689589a4100 } // n = 7, score = 100 // 0fb689589a4100 | movzx ecx, byte ptr [ecx + 0x419a58] // 8808 | mov byte ptr [eax], cl // 0fbf0d???????? | // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 0fb689589a4100 | movzx ecx, byte ptr [ecx + 0x419a58] $sequence_4 = { 8b04bd38054200 834c0318ff 33c0 eb16 e8???????? } // n = 5, score = 100 // 8b04bd38054200 | mov eax, dword ptr [edi*4 + 0x420538] // 834c0318ff | or dword ptr [ebx + eax + 0x18], 0xffffffff // 33c0 | xor eax, eax // eb16 | jmp 0x18 // e8???????? | $sequence_5 = { 8d4c2450 8bd3 e8???????? 83f802 750b } // n = 5, score = 100 // 8d4c2450 | lea ecx, [esp + 0x50] // 8bd3 | mov edx, ebx // e8???????? | // 83f802 | cmp eax, 2 // 750b | jne 0xd $sequence_6 = { 660f282d???????? 660f59f5 660f28aa40904100 660f54e5 660f58fe } // n = 5, score = 100 // 660f282d???????? | // 660f59f5 | mulpd xmm6, xmm5 // 660f28aa40904100 | movapd xmm5, xmmword ptr [edx + 0x419040] // 660f54e5 | andpd xmm4, xmm5 // 660f58fe | addpd xmm7, xmm6 $sequence_7 = { e8???????? 6a00 6a02 ff15???????? 8bfb ff15???????? 8944242c } // n = 7, score = 100 // e8???????? | // 6a00 | push 0 // 6a02 | push 2 // ff15???????? | // 8bfb | mov edi, ebx // ff15???????? | // 8944242c | mov dword ptr [esp + 0x2c], eax condition: 7 of them and filesize < 303104 }
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