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rule win_rustock_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.rustock." 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.rustock" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { ffd6 688d020000 53 a3???????? ffd6 } // n = 5, score = 100 // ffd6 | call esi // 688d020000 | push 0x28d // 53 | push ebx // a3???????? | // ffd6 | call esi $sequence_1 = { 1e 4e 16 da81e53a558c b9157556b8 af 44 } // n = 7, score = 100 // 1e | push ds // 4e | dec esi // 16 | push ss // da81e53a558c | fiadd dword ptr [ecx - 0x73aac51b] // b9157556b8 | mov ecx, 0xb8567515 // af | scasd eax, dword ptr es:[edi] // 44 | inc esp $sequence_2 = { 22a999155d2e ad 282cf4 d7 846be6 5d } // n = 6, score = 100 // 22a999155d2e | and ch, byte ptr [ecx + 0x2e5d1599] // ad | lodsd eax, dword ptr [esi] // 282cf4 | sub byte ptr [esp + esi*8], ch // d7 | xlatb // 846be6 | test byte ptr [ebx - 0x1a], ch // 5d | pop ebp $sequence_3 = { 8b3424 83c404 e9???????? 83ec04 892c24 83ec04 893424 } // n = 7, score = 100 // 8b3424 | mov esi, dword ptr [esp] // 83c404 | add esp, 4 // e9???????? | // 83ec04 | sub esp, 4 // 892c24 | mov dword ptr [esp], ebp // 83ec04 | sub esp, 4 // 893424 | mov dword ptr [esp], esi $sequence_4 = { 5b c9 c20800 56 57 683f000f00 } // n = 6, score = 100 // 5b | pop ebx // c9 | leave // c20800 | ret 8 // 56 | push esi // 57 | push edi // 683f000f00 | push 0xf003f $sequence_5 = { 83c404 ff7424fc c3 53 83ec04 890424 } // n = 6, score = 100 // 83c404 | add esp, 4 // ff7424fc | push dword ptr [esp - 4] // c3 | ret // 53 | push ebx // 83ec04 | sub esp, 4 // 890424 | mov dword ptr [esp], eax $sequence_6 = { 31d9 21d3 b889650100 030d???????? 59 8b1424 83c404 } // n = 7, score = 100 // 31d9 | xor ecx, ebx // 21d3 | and ebx, edx // b889650100 | mov eax, 0x16589 // 030d???????? | // 59 | pop ecx // 8b1424 | mov edx, dword ptr [esp] // 83c404 | add esp, 4 $sequence_7 = { 83c418 8945cc 3bc7 74d4 57 57 ff7514 } // n = 7, score = 100 // 83c418 | add esp, 0x18 // 8945cc | mov dword ptr [ebp - 0x34], eax // 3bc7 | cmp eax, edi // 74d4 | je 0xffffffd6 // 57 | push edi // 57 | push edi // ff7514 | push dword ptr [ebp + 0x14] $sequence_8 = { 750d 833d????????01 0f8441010000 81fafc000000 0f8460010000 8065f800 6804010000 } // n = 7, score = 100 // 750d | jne 0xf // 833d????????01 | // 0f8441010000 | je 0x147 // 81fafc000000 | cmp edx, 0xfc // 0f8460010000 | je 0x166 // 8065f800 | and byte ptr [ebp - 8], 0 // 6804010000 | push 0x104 $sequence_9 = { be948b0100 68d44f0100 59 0315???????? } // n = 4, score = 100 // be948b0100 | mov esi, 0x18b94 // 68d44f0100 | push 0x14fd4 // 59 | pop ecx // 0315???????? | condition: 7 of them and filesize < 565248 }
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