Actor(s): OilRig
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rule win_rdat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.rdat." 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.rdat" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 488b09 483bfb 4c8bc3 4c0f42c7 } // n = 4, score = 300 // 488b09 | dec eax // 483bfb | mov ecx, dword ptr [ecx] // 4c8bc3 | dec eax // 4c0f42c7 | cmp edi, ebx $sequence_1 = { 4c8bc3 4c0f42c7 4d85c0 7504 } // n = 4, score = 300 // 4c8bc3 | dec eax // 4c0f42c7 | inc ebx // 4d85c0 | inc eax // 7504 | cmp byte ptr [edx + ebx], dh $sequence_2 = { 037750 48837b0800 757a 33c0 f04c0fb16b08 7570 } // n = 6, score = 300 // 037750 | jb 0x10 // 48837b0800 | dec eax // 757a | mov ecx, dword ptr [ecx] // 33c0 | dec eax // f04c0fb16b08 | cmp edi, ebx // 7570 | jne 0xfffffff9 $sequence_3 = { 0f8584000000 488b4f30 ff15???????? 90 } // n = 4, score = 300 // 0f8584000000 | dec eax // 488b4f30 | cmp edi, ebx // ff15???????? | // 90 | jae 0x1a $sequence_4 = { 0f8795000000 4584c9 0f849a000000 f6431440 } // n = 4, score = 300 // 0f8795000000 | dec eax // 4584c9 | cmp dword ptr [ecx + 0x18], 0x10 // 0f849a000000 | dec eax // f6431440 | mov edi, dword ptr [ecx + 0x10] $sequence_5 = { 4883ec20 33db 408aea 488bf9 408af3 448d7301 } // n = 6, score = 300 // 4883ec20 | dec esp // 33db | mov eax, ebx // 408aea | dec esp // 488bf9 | cmovb eax, edi // 408af3 | dec eax // 448d7301 | cmp edi, ebx $sequence_6 = { e8???????? 4898 4885c0 751e 483bfb 7313 83c8ff } // n = 7, score = 300 // e8???????? | // 4898 | mov edi, dword ptr [ecx + 0x10] // 4885c0 | jb 5 // 751e | dec eax // 483bfb | mov ecx, dword ptr [ecx] // 7313 | dec eax // 83c8ff | cwde $sequence_7 = { 85c0 740b b9e8030000 ff15???????? } // n = 4, score = 300 // 85c0 | dec esp // 740b | cmovb eax, edi // b9e8030000 | dec ebp // ff15???????? | $sequence_8 = { 4038341a 75f7 4883791810 488b7910 7203 488b09 } // n = 6, score = 300 // 4038341a | inc eax // 75f7 | cmp byte ptr [edx + ebx], dh // 4883791810 | jne 0xfffffff9 // 488b7910 | dec eax // 7203 | cmp dword ptr [ecx + 0x18], 0x10 // 488b09 | dec eax $sequence_9 = { 4803d6 412bc4 413bc5 764a } // n = 4, score = 300 // 4803d6 | cmovb eax, edi // 412bc4 | dec ebp // 413bc5 | test eax, eax // 764a | jne 0x13 $sequence_10 = { 2405 4c0f44f2 eb03 4533c0 ffc7 4983c704 3b7c2470 } // n = 7, score = 300 // 2405 | inc eax // 4c0f44f2 | cmp byte ptr [edx + ebx], dh // eb03 | jne 0xfffffff9 // 4533c0 | dec eax // ffc7 | cmp dword ptr [ecx + 0x18], 0x10 // 4983c704 | dec eax // 3b7c2470 | mov edi, dword ptr [ecx + 0x10] $sequence_11 = { 4803d9 f20f5ed8 395314 7412 } // n = 4, score = 300 // 4803d9 | dec eax // f20f5ed8 | cwde // 395314 | dec eax // 7412 | test eax, eax $sequence_12 = { 4803d1 48634308 4803c2 4885ed } // n = 4, score = 300 // 4803d1 | dec eax // 48634308 | mov edi, dword ptr [ecx + 0x10] // 4803c2 | jb 5 // 4885ed | dec eax $sequence_13 = { 488b4c2468 ff15???????? 85c0 0f8474060000 8b44245c 85c0 } // n = 6, score = 100 // 488b4c2468 | mov ebx, dword ptr [esp + 0x30] // ff15???????? | // 85c0 | dec eax // 0f8474060000 | mov edi, dword ptr [ecx + 0x10] // 8b44245c | jb 5 // 85c0 | dec eax $sequence_14 = { ff15???????? 488d15571a0100 483305???????? 488bcb 488905???????? ff15???????? 488d15511a0100 } // n = 7, score = 100 // ff15???????? | // 488d15571a0100 | je 0xd // 483305???????? | // 488bcb | mov ecx, 0x3e8 // 488905???????? | // ff15???????? | // 488d15511a0100 | dec eax $sequence_15 = { 4883ec20 4883610800 488d05123c0100 c6411000 488901 488b12 488bd9 } // n = 7, score = 100 // 4883ec20 | test eax, eax // 4883610800 | jne 0x20 // 488d05123c0100 | dec eax // c6411000 | cmp edi, ebx // 488901 | jae 0x1a // 488b12 | or eax, 0xffffffff // 488bd9 | dec eax condition: 7 of them and filesize < 1573888 }
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