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rule win_microcin_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" 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 = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 488b8db0010000 4833cc e8???????? 488b9c24d8020000 } // n = 4, score = 400 // 488b8db0010000 | movdqa xmmword ptr [ebp - 0x50], xmm1 // 4833cc | dec eax // e8???????? | // 488b9c24d8020000 | arpl ax, cx $sequence_1 = { 488d8d80020000 ff15???????? 4863c8 c6840d8002000068 488d8d80020000 ff15???????? 4863c8 } // n = 7, score = 400 // 488d8d80020000 | dec eax // ff15???????? | // 4863c8 | lea ecx, dword ptr [ebp + 0x280] // c6840d8002000068 | dec eax // 488d8d80020000 | arpl ax, cx // ff15???????? | // 4863c8 | mov byte ptr [ebp + ecx + 0x280], 0x68 $sequence_2 = { ffd3 85c0 7e18 80bc35a8feffff3a 741f } // n = 5, score = 400 // ffd3 | call ebx // 85c0 | test eax, eax // 7e18 | jle 0x1a // 80bc35a8feffff3a | cmp byte ptr [ebp + esi - 0x158], 0x3a // 741f | je 0x21 $sequence_3 = { e8???????? ff75d4 e8???????? 83c40c 8bc7 } // n = 5, score = 400 // e8???????? | // ff75d4 | push dword ptr [ebp - 0x2c] // e8???????? | // 83c40c | add esp, 0xc // 8bc7 | mov eax, edi $sequence_4 = { 488bf8 488bc8 ff15???????? 85c0 740c 488bd7 } // n = 6, score = 400 // 488bf8 | dec eax // 488bc8 | lea ecx, dword ptr [ebp + 0x280] // ff15???????? | // 85c0 | dec eax // 740c | arpl ax, cx // 488bd7 | dec eax $sequence_5 = { 7515 c74424484c773373 c744244c31674d5a e9???????? c744244849734541 } // n = 5, score = 400 // 7515 | mov byte ptr [ebp + ecx + 0x280], 0x33 // c74424484c773373 | dec eax // c744244c31674d5a | lea ecx, dword ptr [ebp + 0x280] // e9???????? | // c744244849734541 | inc esp $sequence_6 = { ff15???????? 4863c8 c6840d8002000033 488d8d80020000 ff15???????? } // n = 5, score = 400 // ff15???????? | // 4863c8 | lea ecx, dword ptr [ebp + 0x280] // c6840d8002000033 | dec eax // 488d8d80020000 | arpl ax, cx // ff15???????? | $sequence_7 = { 8d45ac 50 6801000080 ff15???????? } // n = 4, score = 400 // 8d45ac | lea eax, dword ptr [ebp - 0x54] // 50 | push eax // 6801000080 | push 0x80000001 // ff15???????? | $sequence_8 = { 56 ff15???????? 85c0 0f45f7 } // n = 4, score = 400 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 0f45f7 | cmovne esi, edi $sequence_9 = { ff15???????? 8b3d???????? 8d85e0feffff 50 ffd7 } // n = 5, score = 400 // ff15???????? | // 8b3d???????? | // 8d85e0feffff | lea eax, dword ptr [ebp - 0x120] // 50 | push eax // ffd7 | call edi $sequence_10 = { 50 6805100000 68ffff0000 56 8b35???????? } // n = 5, score = 400 // 50 | push eax // 6805100000 | push 0x1005 // 68ffff0000 | push 0xffff // 56 | push esi // 8b35???????? | $sequence_11 = { 8b1d???????? 8d85a8feffff 50 ffd3 } // n = 4, score = 400 // 8b1d???????? | // 8d85a8feffff | lea eax, dword ptr [ebp - 0x158] // 50 | push eax // ffd3 | call ebx $sequence_12 = { ff15???????? 4863c8 c6840d8002000075 488d8d80020000 ff15???????? 4863c8 c6840d8002000076 } // n = 7, score = 400 // ff15???????? | // 4863c8 | sub eax, ebx // c6840d8002000075 | dec eax // 488d8d80020000 | add edx, esi // ff15???????? | // 4863c8 | inc ebp // c6840d8002000076 | xor ecx, ecx $sequence_13 = { 83c40c 8d85f8feffff 6804010000 50 ff15???????? 8d85f8feffff } // n = 6, score = 400 // 83c40c | add esp, 0xc // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] // 6804010000 | push 0x104 // 50 | push eax // ff15???????? | // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] $sequence_14 = { 442bc3 4803d6 4533c9 ff15???????? 85c0 75d9 488b742438 } // n = 7, score = 400 // 442bc3 | mov byte ptr [ebp + ecx + 0x280], 0x75 // 4803d6 | dec eax // 4533c9 | lea ecx, dword ptr [ebp + 0x280] // ff15???????? | // 85c0 | movdqa xmmword ptr [ebp - 0x60], xmm0 // 75d9 | movdqa xmmword ptr [ebp - 0x70], xmm1 // 488b742438 | movdqa xmmword ptr [ebp - 0x40], xmm0 $sequence_15 = { 660f7f45a0 660f6f05???????? 660f7f4d90 660f6f0d???????? 660f7f45c0 660f7f4db0 } // n = 6, score = 400 // 660f7f45a0 | je 0x10 // 660f6f05???????? | // 660f7f4d90 | dec eax // 660f6f0d???????? | // 660f7f45c0 | mov edx, edi // 660f7f4db0 | dec eax $sequence_16 = { 41bc14030000 4c8d0574130100 488bcd 418bd4 e8???????? 33c9 } // n = 6, score = 200 // 41bc14030000 | dec eax // 4c8d0574130100 | sub esp, 0x20 // 488bcd | mov ebx, ecx // 418bd4 | je 0x1b // e8???????? | // 33c9 | dec eax $sequence_17 = { 53 53 56 43 } // n = 4, score = 200 // 53 | push ebx // 53 | push ebx // 56 | push esi // 43 | inc ebx $sequence_18 = { 4c8d05b7120100 41b903000000 488d4c45bc 488bc1 492bc5 } // n = 5, score = 200 // 4c8d05b7120100 | jmp 0x13 // 41b903000000 | mov eax, dword ptr [ebp - 0xc] // 488d4c45bc | add eax, 1 // 488bc1 | mov dword ptr [ebp - 0xc], eax // 492bc5 | test eax, eax $sequence_19 = { 4c8d056c120100 498bd4 488bcd e8???????? 85c0 7541 4c8bc3 } // n = 7, score = 200 // 4c8d056c120100 | inc ebp // 498bd4 | xor eax, eax // 488bcd | inc ecx // e8???????? | // 85c0 | lea edx, dword ptr [eax + 1] // 7541 | inc eax // 4c8bc3 | push ebx $sequence_20 = { 4c8d0535120100 33c0 498bd0 3b0a 740e ffc0 } // n = 6, score = 200 // 4c8d0535120100 | dec eax // 33c0 | mov ecx, ebp // 498bd0 | test eax, eax // 3b0a | jne 0x1c // 740e | dec eax // ffc0 | lea edx, dword ptr [0x111f8] $sequence_21 = { 8b4df0 890c85003c4100 eb14 8b5514 52 } // n = 5, score = 200 // 8b4df0 | add edx, 0x4b000 // 890c85003c4100 | cmp ecx, edx // eb14 | jl 0xfffffff6 // 8b5514 | mov edx, dword ptr [ebp - 0x10] // 52 | mov eax, dword ptr [edx + 0x20] $sequence_22 = { ffd2 83c414 8945f0 8b45f4 83c008 50 } // n = 6, score = 200 // ffd2 | pop ecx // 83c414 | and dword ptr [ebp - 4], 0 // 8945f0 | push dword ptr [esi + 0x68] // 8b45f4 | add edx, 8 // 83c008 | push edx // 50 | push 6 $sequence_23 = { 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_24 = { 7419 488d15730c0100 488bc8 ff15???????? 4885c0 7404 8bcb } // n = 7, score = 200 // 7419 | jmp 0x1f // 488d15730c0100 | mov eax, dword ptr [ebp - 0x84] // 488bc8 | add eax, 1 // ff15???????? | // 4885c0 | push esi // 7404 | push edi // 8bcb | mov dword ptr [ebp - 0xc], 0 $sequence_25 = { 6828010000 8d85ccfeffff 6a00 50 } // n = 4, score = 200 // 6828010000 | mov esi, dword ptr [esp + 0x38] // 8d85ccfeffff | dec eax // 6a00 | mov ecx, dword ptr [ebp + 0x1b0] // 50 | dec eax $sequence_26 = { fa fa fa fa fa } // n = 5, score = 200 // fa | cli // fa | cli // fa | cli // fa | cli // fa | cli $sequence_27 = { 83ec08 8b4508 0fb608 81e107000080 7905 49 83c9f8 } // n = 7, score = 200 // 83ec08 | mov dword ptr [ebp - 0xc], eax // 8b4508 | test eax, eax // 0fb608 | jne 0xd // 81e107000080 | mov eax, dword ptr [esi + 0xc] // 7905 | mov dword ptr [esi + 0x10], eax // 49 | mov edx, dword ptr [esi + 0x34] // 83c9f8 | inc ecx $sequence_28 = { 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_29 = { 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_30 = { 83e902 8b957cffffff 894c9584 c7857cffffff00000000 eb0f 8b857cffffff 83c001 } // n = 7, score = 200 // 83e902 | sub esp, 8 // 8b957cffffff | mov eax, dword ptr [ebp + 8] // 894c9584 | movzx ecx, byte ptr [eax] // c7857cffffff00000000 | and ecx, 0x80000007 // eb0f | jns 0x10 // 8b857cffffff | dec ecx // 83c001 | or ecx, 0xfffffff8 $sequence_31 = { 4889742420 e8???????? cc 4c8d056c120100 498bd4 488bcd } // n = 6, score = 200 // 4889742420 | jne 0x1e // e8???????? | // cc | dec eax // 4c8d056c120100 | lea edx, dword ptr [0x111f8] // 498bd4 | inc ecx // 488bcd | mov eax, 0x12010 $sequence_32 = { e8???????? 85c0 751a 488d15f8110100 41b810200100 488bcd e8???????? } // n = 7, score = 200 // e8???????? | // 85c0 | lea ecx, dword ptr [ebp - 0xb60] // 751a | mov eax, dword ptr [ebp - 0x208c] // 488d15f8110100 | pop esi // 41b810200100 | call edx // 488bcd | add esp, 0x14 // e8???????? | $sequence_33 = { 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_34 = { 83c208 52 ff15???????? 6a06 ff15???????? } // n = 5, score = 200 // 83c208 | push 0 // 52 | push eax // ff15???????? | // 6a06 | pop ecx // ff15???????? | $sequence_35 = { 83c410 c78574dfffff00000000 8d8da0f4ffff e8???????? 8b8574dfffff 5e } // n = 6, score = 200 // 83c410 | mov dword ptr [ebp - 0xc], eax // c78574dfffff00000000 | mov ecx, dword ptr [ebp - 0x10] // 8d8da0f4ffff | mov byte ptr [esi + 0x14b], 0x43 // e8???????? | // 8b8574dfffff | mov dword ptr [esi + 0x68], 0x4135f8 // 5e | push 0xd $sequence_36 = { ff15???????? 8b55f0 8b4220 8945f4 8b4df0 } // n = 5, score = 200 // ff15???????? | // 8b55f0 | cli // 8b4220 | cli // 8945f4 | jbe 0x6b // 8b4df0 | jb 0x71 $sequence_37 = { 4533c0 418d5001 e9???????? 4053 4883ec20 8bd9 } // n = 6, score = 200 // 4533c0 | push eax // 418d5001 | sub ecx, 2 // e9???????? | // 4053 | mov edx, dword ptr [ebp - 0x84] // 4883ec20 | mov dword ptr [ebp + edx*4 - 0x7c], ecx // 8bd9 | mov dword ptr [ebp - 0x84], 0 $sequence_38 = { c6864b01000043 c74668f8354100 6a0d e8???????? 59 8365fc00 ff7668 } // n = 7, score = 200 // c6864b01000043 | outsb dx, byte ptr [esi] // c74668f8354100 | insd dword ptr es:[edi], dx // 6a0d | outsb dx, byte ptr gs:[esi] // e8???????? | // 59 | je 8 // 8365fc00 | push 0x128 // ff7668 | lea eax, dword ptr [ebp - 0x134] $sequence_39 = { c3 8b04c54c8b4000 5d c3 55 8bec } // n = 6, score = 100 // c3 | push esi // 8b04c54c8b4000 | cmp eax, 0x89 // 5d | ja 0x1bd // c3 | movzx eax, byte ptr [eax + 0x401830] // 55 | jmp dword ptr [eax*4 + 0x4017d8] // 8bec | lea eax, dword ptr [ebp - 0x24] $sequence_40 = { 50 ff15???????? 8d85c8feffff 50 ff15???????? 85c0 7518 } // n = 7, score = 100 // 50 | push 0x128 // ff15???????? | // 8d85c8feffff | lea eax, dword ptr [ebp - 0x134] // 50 | push 0 // ff15???????? | // 85c0 | push eax // 7518 | push eax $sequence_41 = { c7442418d0114000 c744241c00000000 c744242000000000 89742424 } // n = 4, score = 100 // c7442418d0114000 | mov dword ptr [esp + 0x4c], 0x5a4d6731 // c744241c00000000 | mov dword ptr [esp + 0x48], 0x41457349 // c744242000000000 | dec eax // 89742424 | arpl ax, cx $sequence_42 = { 50 6a08 ffd7 8b1d???????? 8bf0 83feff } // n = 6, score = 100 // 50 | xor ecx, esp // 6a08 | dec eax // ffd7 | mov ebx, dword ptr [esp + 0x2d8] // 8b1d???????? | // 8bf0 | jne 0x17 // 83feff | mov dword ptr [esp + 0x48], 0x7333774c $sequence_43 = { 8d85b8feffff 50 ff15???????? 0fb785c4feffff 50 0fb785c2feffff 50 } // n = 7, score = 100 // 8d85b8feffff | push 8 // 50 | call edi // ff15???????? | // 0fb785c4feffff | mov esi, eax // 50 | cmp esi, -1 // 0fb785c2feffff | mov dword ptr [esp + 0x18], 0x4011d0 // 50 | mov dword ptr [esp + 0x1c], 0 $sequence_44 = { e8???????? 59 8945f4 85c0 7506 8b460c 894610 } // n = 7, score = 100 // e8???????? | // 59 | insd dword ptr es:[edi], dx // 8945f4 | jbe 0x6b // 85c0 | jb 0x71 // 7506 | outsb dx, byte ptr [esi] // 8b460c | insd dword ptr es:[edi], dx // 894610 | outsb dx, byte ptr gs:[esi] $sequence_45 = { e8???????? 49 8b4e08 44 2bf8 } // n = 5, score = 100 // e8???????? | // 49 | dec ecx // 8b4e08 | mov ecx, dword ptr [esi + 8] // 44 | inc esp // 2bf8 | sub edi, eax $sequence_46 = { 895c2500 47 89542504 ebb6 } // n = 4, score = 100 // 895c2500 | mov dword ptr [ebp], ebx // 47 | inc edi // 89542504 | mov dword ptr [ebp + 4], edx // ebb6 | jmp 0xffffffb8 $sequence_47 = { 83c428 8d85e8f4ffff 50 ff15???????? 8bf0 33c9 85f6 } // n = 7, score = 100 // 83c428 | mov dword ptr [esp + 0x20], 0 // 8d85e8f4ffff | mov dword ptr [esp + 0x24], esi // 50 | add esp, 0xc // ff15???????? | // 8bf0 | lea eax, dword ptr [ebp - 0x318] // 33c9 | push 0x104 // 85f6 | push eax $sequence_48 = { 3d89000000 0f87b2010000 0fb68030184000 ff2485d8174000 68???????? 8d45dc } // n = 6, score = 100 // 3d89000000 | mov byte ptr [ebp + ecx + 0x280], 0x76 // 0f87b2010000 | cmp byte ptr [esp + ecx + 0x5f], 0x5c // 0fb68030184000 | je 0x1a // ff2485d8174000 | dec eax // 68???????? | // 8d45dc | lea ecx, dword ptr [esp + 0x60] 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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