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rule win_microcin_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" version = "1" description = "Detects win.microcin." 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.microcin" malpedia_rule_date = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { 8b1d???????? 8d85a8feffff 50 ffd3 } // n = 4, score = 400 // 8b1d???????? | // 8d85a8feffff | lea eax, dword ptr [ebp - 0x158] // 50 | push eax // ffd3 | call ebx $sequence_1 = { 8d85f8feffff 6804010000 50 ff15???????? 8d85f8feffff } // n = 5, score = 400 // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] // 6804010000 | push 0x104 // 50 | push eax // ff15???????? | // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] $sequence_2 = { 4863c8 c6840d8002000068 488d8d80020000 ff15???????? 4863c8 c6840d8002000077 } // n = 6, score = 400 // 4863c8 | xor ecx, esp // c6840d8002000068 | dec eax // 488d8d80020000 | mov ebx, dword ptr [esp + 0x2d8] // ff15???????? | // 4863c8 | dec eax // c6840d8002000077 | add esp, 0x2c0 $sequence_3 = { 8d45ac 50 6801000080 ff15???????? 85c0 } // n = 5, score = 400 // 8d45ac | lea eax, dword ptr [ebp - 0x54] // 50 | push eax // 6801000080 | push 0x80000001 // ff15???????? | // 85c0 | test eax, eax $sequence_4 = { ffd3 85c0 7e18 80bc35a8feffff3a } // n = 4, score = 400 // ffd3 | call ebx // 85c0 | test eax, eax // 7e18 | jle 0x1a // 80bc35a8feffff3a | cmp byte ptr [ebp + esi - 0x158], 0x3a $sequence_5 = { 68ffff0000 56 8b35???????? ffd6 } // n = 4, score = 400 // 68ffff0000 | push 0xffff // 56 | push esi // 8b35???????? | // ffd6 | call esi $sequence_6 = { 7422 03d8 3bdf 741c } // n = 4, score = 400 // 7422 | je 0x24 // 03d8 | add ebx, eax // 3bdf | cmp ebx, edi // 741c | je 0x1e $sequence_7 = { 7e18 80bc35a8feffff3a 741f 8d85a8feffff } // n = 4, score = 400 // 7e18 | jle 0x1a // 80bc35a8feffff3a | cmp byte ptr [ebp + esi - 0x158], 0x3a // 741f | je 0x21 // 8d85a8feffff | lea eax, dword ptr [ebp - 0x158] $sequence_8 = { 488903 48894308 488b0d???????? ff15???????? 4885c0 742b 488b4018 } // n = 7, score = 400 // 488903 | mov byte ptr [ebp + ecx + 0x280], 0x77 // 48894308 | dec eax // 488b0d???????? | // ff15???????? | // 4885c0 | add esp, 0x600 // 742b | inc ecx // 488b4018 | pop edi $sequence_9 = { ff15???????? 85c0 7426 8b400c } // n = 4, score = 400 // ff15???????? | // 85c0 | test eax, eax // 7426 | je 0x28 // 8b400c | mov eax, dword ptr [eax + 0xc] $sequence_10 = { ff15???????? 8b3d???????? 8d85e0feffff 50 } // n = 4, score = 400 // ff15???????? | // 8b3d???????? | // 8d85e0feffff | lea eax, dword ptr [ebp - 0x120] // 50 | push eax $sequence_11 = { ff15???????? 85c0 740c 488bd7 488bcb } // n = 5, score = 400 // ff15???????? | // 85c0 | dec eax // 740c | lea ecx, dword ptr [ebp + 0x280] // 488bd7 | dec eax // 488bcb | arpl ax, cx $sequence_12 = { 4833cc e8???????? 488b9c24d8020000 4881c4c0020000 } // n = 4, score = 400 // 4833cc | dec eax // e8???????? | // 488b9c24d8020000 | lea ecx, dword ptr [ebp + 0x280] // 4881c4c0020000 | dec eax $sequence_13 = { 488d8d80020000 ff15???????? 4863c8 c6840d8002000075 488d8d80020000 ff15???????? 4863c8 } // n = 7, score = 400 // 488d8d80020000 | dec eax // ff15???????? | // 4863c8 | lea ecx, dword ptr [ebp + 0x280] // c6840d8002000075 | dec eax // 488d8d80020000 | arpl ax, cx // ff15???????? | // 4863c8 | mov byte ptr [ebp + ecx + 0x280], 0x75 $sequence_14 = { e8???????? 488905???????? 33c9 488908 } // n = 4, score = 400 // e8???????? | // 488905???????? | // 33c9 | arpl ax, cx // 488908 | dec eax $sequence_15 = { 4881c400060000 415f 415e 415c 5f 5e } // n = 6, score = 400 // 4881c400060000 | xor ecx, ecx // 415f | dec eax // 415e | mov dword ptr [eax], ecx // 415c | dec eax // 5f | arpl ax, cx // 5e | mov byte ptr [ebp + ecx + 0x280], 0x68 $sequence_16 = { 0345f8 8b4df0 890c85003c4100 eb14 } // n = 4, score = 200 // 0345f8 | push esi // 8b4df0 | mov ecx, dword ptr [eax + 0xf0] // 890c85003c4100 | push edi // eb14 | mov dword ptr [ebp - 4], ecx $sequence_17 = { 85c0 751a 488d15f8110100 41b810200100 488bcd e8???????? } // n = 6, score = 200 // 85c0 | mov ebx, ecx // 751a | dec eax // 488d15f8110100 | lea ecx, dword ptr [0x10c95] // 41b810200100 | dec eax // 488bcd | test eax, eax // e8???????? | $sequence_18 = { 8b45e4 c700???????? c745fc6c6c0000 c745f46d737664 } // n = 4, score = 200 // 8b45e4 | mov ecx, dword ptr [eax + 0xec] // c700???????? | // c745fc6c6c0000 | push 0x1c // c745f46d737664 | mov dword ptr [ebp - 0xc], ecx $sequence_19 = { 52 ff15???????? 6a06 ff15???????? } // n = 4, score = 200 // 52 | lea esi, dword ptr [edi + 0x3c] // ff15???????? | // 6a06 | push edi // ff15???????? | $sequence_20 = { 8b4508 8945fc 8b4dfc 030d???????? 894dfc } // n = 5, score = 200 // 8b4508 | cli // 8945fc | cli // 8b4dfc | jae 0x72 // 030d???????? | // 894dfc | imul esp, dword ptr [ebp + 0x72], 0x6e656761 $sequence_21 = { e8???????? 4c8d05b7120100 41b903000000 488d4c45bc } // n = 4, score = 200 // e8???????? | // 4c8d05b7120100 | add eax, dword ptr [ebp - 0x2084] // 41b903000000 | mov ecx, dword ptr [ebp - 0x2088] // 488d4c45bc | imul ecx, ecx, 0x68 $sequence_22 = { 4c8d0502130100 8bd7 498bcd e8???????? 85c0 7415 } // n = 6, score = 200 // 4c8d0502130100 | mov eax, dword ptr [ebp - 0x1c] // 8bd7 | mov dword ptr [ebp - 4], 0x6c6c // 498bcd | mov dword ptr [ebp - 0xc], 0x6476736d // e8???????? | // 85c0 | sar eax, cl // 7415 | and edx, eax $sequence_23 = { 49 53 53 56 43 } // n = 5, score = 200 // 49 | dec ecx // 53 | push ebx // 53 | push ebx // 56 | push esi // 43 | inc ebx $sequence_24 = { d3f8 23d0 0fb6450c 0fb675ff } // n = 4, score = 200 // d3f8 | mov eax, dword ptr [ebp + 8] // 23d0 | mov dword ptr [ebp - 4], eax // 0fb6450c | mov ecx, dword ptr [ebp - 4] // 0fb675ff | mov dword ptr [ebp - 4], ecx $sequence_25 = { 83c101 898d7cdfffff 8b95c4f4ffff 83ea01 39957cdfffff 0f8dbd000000 } // n = 6, score = 200 // 83c101 | je 0x38 // 898d7cdfffff | js 0x72 // 8b95c4f4ffff | push ebx // 83ea01 | push ebx // 39957cdfffff | push esi // 0f8dbd000000 | inc ebx $sequence_26 = { 726f 6e 6d 656e } // n = 4, score = 200 // 726f | jb 0x71 // 6e | outsb dx, byte ptr [esi] // 6d | insd dword ptr es:[edi], dx // 656e | outsb dx, byte ptr gs:[esi] $sequence_27 = { 89849578feffff ebc7 e9???????? 8b4d08 8b9104010000 52 ff15???????? } // n = 7, score = 200 // 89849578feffff | push 0x128 // ebc7 | lea eax, dword ptr [ebp - 0x134] // e9???????? | // 8b4d08 | push 0 // 8b9104010000 | push eax // 52 | mov edi, dword ptr [ebp + 8] // ff15???????? | $sequence_28 = { 4c8d0574130100 488bcd 418bd4 e8???????? 33c9 85c0 } // n = 6, score = 200 // 4c8d0574130100 | mov edx, edi // 488bcd | dec ecx // 418bd4 | mov ecx, ebp // e8???????? | // 33c9 | dec eax // 85c0 | sub esp, 0x20 $sequence_29 = { 636373 7673 6873742e65 7865 } // n = 4, score = 200 // 636373 | arpl word ptr [ebx + 0x73], sp // 7673 | jbe 0x75 // 6873742e65 | push 0x652e7473 // 7865 | js 0x67 $sequence_30 = { e8???????? cc 4c8d056c120100 498bd4 488bcd } // n = 5, score = 200 // e8???????? | // cc | test eax, eax // 4c8d056c120100 | jne 0x2e // 498bd4 | dec esp // 488bcd | lea eax, dword ptr [0x11302] $sequence_31 = { 6828010000 8d85ccfeffff 6a00 50 } // n = 4, score = 200 // 6828010000 | pop edi // 8d85ccfeffff | pop esi // 6a00 | test eax, eax // 50 | je 0xe $sequence_32 = { 6e 7669 726f 6e } // n = 4, score = 200 // 6e | outsb dx, byte ptr [esi] // 7669 | jbe 0x6b // 726f | jb 0x71 // 6e | outsb dx, byte ptr [esi] $sequence_33 = { fa fa fa fa fa fa } // n = 6, score = 200 // fa | cli // fa | cli // fa | cli // fa | cli // fa | cli // fa | cli $sequence_34 = { 4c8bc3 498bd4 488bcd e8???????? 85c0 751a 488d15f8110100 } // n = 7, score = 200 // 4c8bc3 | push edx // 498bd4 | push 6 // 488bcd | add eax, dword ptr [ebp - 8] // e8???????? | // 85c0 | mov ecx, dword ptr [ebp - 0x10] // 751a | mov dword ptr [eax*4 + 0x413c00], ecx // 488d15f8110100 | jmp 0x1d $sequence_35 = { 0f8dbd000000 8b8578dfffff 03857cdfffff 8b8d78dfffff 6bc968 } // n = 5, score = 200 // 0f8dbd000000 | add ecx, 1 // 8b8578dfffff | mov dword ptr [ebp - 0x2084], ecx // 03857cdfffff | mov edx, dword ptr [ebp - 0xb3c] // 8b8d78dfffff | sub edx, 1 // 6bc968 | cmp dword ptr [ebp - 0x2084], edx $sequence_36 = { 85c0 752a 4c8d0502130100 8bd7 498bcd } // n = 5, score = 200 // 85c0 | mov ecx, ebp // 752a | test eax, eax // 4c8d0502130100 | jne 0x21 // 8bd7 | dec eax // 498bcd | lea edx, dword ptr [0x111f8] $sequence_37 = { 7370 696465726167656e 742e 657865 } // n = 4, score = 200 // 7370 | jae 0x72 // 696465726167656e | imul esp, dword ptr [ebp + 0x72], 0x6e656761 // 742e | je 0x30 // 657865 | js 0x68 $sequence_38 = { 4883ec20 8bd9 488d0d950c0100 ff15???????? 4885c0 7419 488d15730c0100 } // n = 7, score = 200 // 4883ec20 | lea eax, dword ptr [eax*2 + 0x413e64] // 8bd9 | dec esp // 488d0d950c0100 | mov eax, ebx // ff15???????? | // 4885c0 | dec ecx // 7419 | mov edx, esp // 488d15730c0100 | dec eax $sequence_39 = { 8d85f0feffff 50 ffb59cfcffff ff15???????? } // n = 4, score = 100 // 8d85f0feffff | test eax, eax // 50 | je 0x34 // ffb59cfcffff | dec eax // ff15???????? | $sequence_40 = { 50 660f7f45d0 660fd645e0 c745e800000000 } // n = 4, score = 100 // 50 | push eax // 660f7f45d0 | push eax // 660fd645e0 | add esp, 0xc // c745e800000000 | lea eax, dword ptr [ebp - 0x134] $sequence_41 = { 50 e8???????? 83c40c 8d85ccfeffff 50 56 } // n = 6, score = 100 // 50 | dec eax // e8???????? | // 83c40c | mov edx, edi // 8d85ccfeffff | dec eax // 50 | mov ecx, ebx // 56 | dec eax $sequence_42 = { 8b7d08 8d773c 57 56 } // n = 4, score = 100 // 8b7d08 | outsb dx, byte ptr [esi] // 8d773c | insd dword ptr es:[edi], dx // 57 | jbe 0x6b // 56 | jb 0x71 $sequence_43 = { c3 6a08 68???????? e8???????? 8b7508 c7465cf8814000 } // n = 6, score = 100 // c3 | mov dword ptr [ebx], eax // 6a08 | dec eax // 68???????? | // e8???????? | // 8b7508 | mov dword ptr [ebx + 8], eax // c7465cf8814000 | dec eax $sequence_44 = { 0fb785bafeffff 50 0f57c0 8d45d0 68???????? 50 660f7f45d0 } // n = 7, score = 100 // 0fb785bafeffff | push eax // 50 | push esi // 0f57c0 | ret // 8d45d0 | push 8 // 68???????? | // 50 | mov esi, dword ptr [ebp + 8] // 660f7f45d0 | mov dword ptr [esi + 0x5c], 0x4081f8 $sequence_45 = { ebe8 8975e0 81fe00010000 7d10 8a841e19010000 8886a8d54000 46 } // n = 7, score = 100 // ebe8 | mov eax, dword ptr [eax + 0x18] // 8975e0 | dec eax // 81fe00010000 | xor eax, esp // 7d10 | dec eax // 8a841e19010000 | mov dword ptr [ebp + 0x4f0], eax // 8886a8d54000 | inc ebp // 46 | xor eax, eax $sequence_46 = { 8d9548030000 41 ffd4 48 89f2 48 8d8d4c040000 } // n = 7, score = 100 // 8d9548030000 | lea edx, dword ptr [ebp + 0x348] // 41 | inc ecx // ffd4 | call esp // 48 | dec eax // 89f2 | mov edx, esi // 48 | dec eax // 8d8d4c040000 | lea ecx, dword ptr [ebp + 0x44c] $sequence_47 = { b888000000 48 034528 8b00 894504 b88c000000 48 } // n = 7, score = 100 // b888000000 | mov eax, 0x88 // 48 | dec eax // 034528 | add eax, dword ptr [ebp + 0x28] // 8b00 | mov eax, dword ptr [eax] // 894504 | mov dword ptr [ebp + 4], eax // b88c000000 | mov eax, 0x8c // 48 | dec eax $sequence_48 = { e8???????? 83c40c 8d85c8feffff 68???????? 50 ff15???????? 8d85c8feffff } // n = 7, score = 100 // e8???????? | // 83c40c | mov edi, edx // 8d85c8feffff | push 0x128 // 68???????? | // 50 | lea eax, dword ptr [ebp - 0x134] // ff15???????? | // 8d85c8feffff | push 0 condition: 7 of them and filesize < 417792 }
import "pe" rule win_microcin_w0 { meta: description = "Malware sample mentioned in Microcin technical report by Kaspersky" author = "Florian Roth" reference = "https://securelist.com/files/2017/09/Microcin_Technical-PDF_eng_final.pdf" date = "2017-09-26" hash = "49816eefcd341d7a9c1715e1f89143862d4775ba4f9730397a1e8529f5f5e200" hash = "a73f8f76a30ad5ab03dd503cc63de3a150e6ab75440c1060d75addceb4270f46" hash = "9dd9bb13c2698159eb78a0ecb4e8692fd96ca4ecb50eef194fa7479cb65efb7c" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.microcin" malpedia_version = "20170413" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "e Class Descriptor at (" fullword ascii $s2 = ".?AVCAntiAntiAppleFrameRealClass@@" fullword ascii $s3 = ".?AVCAntiAntiAppleFrameBaseClass@@" fullword ascii $s4 = ".?AVCAppleBinRealClass@@" fullword ascii $s5 = ".?AVCAppleBinBaseClass@@" fullword ascii condition: uint16(0) == 0x5a4d and filesize < 300KB and (4 of them or pe.imphash() == "897077ca318eaf629cfe74569f10e023") }
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