Actor(s): Silent Chollima
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rule win_jupiter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.jupiter." 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.jupiter" 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 = { 8a4147 884104 8a4146 884105 8b4144 c1f808 884106 } // n = 7, score = 400 // 8a4147 | dec eax // 884104 | mov dword ptr [esp + 0x200], 0 // 8a4146 | dec eax // 884105 | mov eax, dword ptr [esp + 0x20] // 8b4144 | dec eax // c1f808 | mov dword ptr [eax + 0x30], 0 // 884106 | dec eax $sequence_1 = { c605????????01 66c705????????0101 c605????????01 c605????????01 66c705????????0101 } // n = 5, score = 400 // c605????????01 | // 66c705????????0101 | // c605????????01 | // c605????????01 | // 66c705????????0101 | $sequence_2 = { 8b4144 c1f808 884106 8a4144 884107 } // n = 5, score = 400 // 8b4144 | lea eax, [ebp + 0x400] // c1f808 | mov edx, 0x8004667e // 884106 | mov dword ptr [ebp + 0x400], eax // 8a4144 | test eax, eax // 884107 | dec esp $sequence_3 = { 884105 8b4144 c1f808 884106 8a4144 } // n = 5, score = 400 // 884105 | dec esp // 8b4144 | add ebx, ecx // c1f808 | dec ecx // 884106 | dec esp // 8a4144 | jne 0x14a8 $sequence_4 = { 50 6802000000 ff35???????? ff35???????? } // n = 4, score = 400 // 50 | dec eax // 6802000000 | mov eax, dword ptr [esp + 0xd0] // ff35???????? | // ff35???????? | $sequence_5 = { 66c705????????0101 c605????????01 c605????????01 c605????????01 } // n = 4, score = 400 // 66c705????????0101 | // c605????????01 | // c605????????01 | // c605????????01 | $sequence_6 = { 884105 8b4144 c1f808 884106 8a4144 884107 } // n = 6, score = 400 // 884105 | dec eax // 8b4144 | lea edx, [0xf293] // c1f808 | dec eax // 884106 | mov ecx, ebx // 8a4144 | dec eax // 884107 | lea edx, [0xf293] $sequence_7 = { c1f808 884106 8a4144 884107 } // n = 4, score = 400 // c1f808 | test eax, eax // 884106 | jne 0x1a70 // 8a4144 | inc esp // 884107 | mov edi, dword ptr [ebp + 0x58] $sequence_8 = { c605????????01 66c705????????0101 c605????????01 c605????????01 } // n = 4, score = 400 // c605????????01 | // 66c705????????0101 | // c605????????01 | // c605????????01 | $sequence_9 = { 884104 8a4146 884105 8b4144 } // n = 4, score = 400 // 884104 | jg 0x291 // 8a4146 | mov esi, eax // 884105 | push edi // 8b4144 | test ebp, ebp condition: 7 of them and filesize < 224112 }
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