Actor(s): Lazarus Group
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rule win_rifdoor_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.rifdoor" 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 = { 8d89244b4100 5a 668b31 41 } // n = 4, score = 200 // 8d89244b4100 | lea ecx, [ecx + 0x414b24] // 5a | pop edx // 668b31 | mov si, word ptr [ecx] // 41 | inc ecx $sequence_1 = { 75b4 8b37 8b4704 8b4f08 } // n = 4, score = 200 // 75b4 | jne 0xffffffb6 // 8b37 | mov esi, dword ptr [edi] // 8b4704 | mov eax, dword ptr [edi + 4] // 8b4f08 | mov ecx, dword ptr [edi + 8] $sequence_2 = { bf???????? 833cf55440410001 751e 8d04f550404100 } // n = 4, score = 200 // bf???????? | // 833cf55440410001 | cmp dword ptr [esi*8 + 0x414054], 1 // 751e | jne 0x20 // 8d04f550404100 | lea eax, [esi*8 + 0x414050] $sequence_3 = { b9???????? e8???????? 8b4c2414 8be8 } // n = 4, score = 200 // b9???????? | // e8???????? | // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8be8 | mov ebp, eax $sequence_4 = { ffd7 53 8be8 ffd7 8b5c2410 } // n = 5, score = 200 // ffd7 | call edi // 53 | push ebx // 8be8 | mov ebp, eax // ffd7 | call edi // 8b5c2410 | mov ebx, dword ptr [esp + 0x10] $sequence_5 = { 881e 8ad8 32d9 22da 8ad0 } // n = 5, score = 200 // 881e | mov byte ptr [esi], bl // 8ad8 | mov bl, al // 32d9 | xor bl, cl // 22da | and bl, dl // 8ad0 | mov dl, al $sequence_6 = { 56 89742414 ff15???????? 33c0 a3???????? } // n = 5, score = 200 // 56 | push esi // 89742414 | mov dword ptr [esp + 0x14], esi // ff15???????? | // 33c0 | xor eax, eax // a3???????? | $sequence_7 = { 8bf8 52 57 e8???????? 83c40c 57 ff15???????? } // n = 7, score = 200 // 8bf8 | mov edi, eax // 52 | push edx // 57 | push edi // e8???????? | // 83c40c | add esp, 0xc // 57 | push edi // ff15???????? | $sequence_8 = { 897c2474 897c2478 e8???????? 83c404 397c2474 7513 } // n = 6, score = 200 // 897c2474 | mov dword ptr [esp + 0x74], edi // 897c2478 | mov dword ptr [esp + 0x78], edi // e8???????? | // 83c404 | add esp, 4 // 397c2474 | cmp dword ptr [esp + 0x74], edi // 7513 | jne 0x15 $sequence_9 = { 8d442438 b932000000 33d2 50 } // n = 4, score = 200 // 8d442438 | lea eax, [esp + 0x38] // b932000000 | mov ecx, 0x32 // 33d2 | xor edx, edx // 50 | push eax condition: 7 of them and filesize < 212992 }
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