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Windows Analysis Report
F3dll.exe.dll

Overview

General Information

Sample name:F3dll.exe.dll
Analysis ID:1523126
MD5:02ae2c79bc656c9ab75f82ef03f49069
SHA1:50a1110631b3a2c86730599edbfe205b01684361
SHA256:d334f7d1af5388ab97f95f947ffe4e19e33b6221dcba5b89a67fb558392942a6
Tags:dlluser-lontze7
Infos:

Detection

Score:72
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
.NET source code contains potential unpacker
AI detected suspicious sample
Machine Learning detection for sample
Yara detected Generic Downloader
Creates a process in suspended mode (likely to inject code)
Program does not show much activity (idle)
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Yara signature match

Classification

  • System is w10x64
  • loaddll32.exe (PID: 1136 cmdline: loaddll32.exe "C:\Users\user\Desktop\F3dll.exe.dll" MD5: 51E6071F9CBA48E79F10C84515AAE618)
    • conhost.exe (PID: 2872 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: 0D698AF330FD17BEE3BF90011D49251D)
    • cmd.exe (PID: 5164 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1 MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B)
      • rundll32.exe (PID: 4008 cmdline: rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1 MD5: 889B99C52A60DD49227C5E485A016679)
  • cleanup
No configs have been found
SourceRuleDescriptionAuthorStrings
F3dll.exe.dllJoeSecurity_GenericDownloader_1Yara detected Generic DownloaderJoe Security
    F3dll.exe.dllMALWARE_Win_DLAgent09Detects known downloader agentditekSHen
    • 0x16fd:$h1: //:ptth
    • 0xfc1:$s1: DownloadString
    • 0xe27:$s2: StrReverse
    • 0xfb0:$s3: FromBase64String
    • 0x1237:$s4: WebClient
    No Sigma rule has matched
    No Suricata rule has matched

    Click to jump to signature section

    Show All Signature Results

    AV Detection

    barindex
    Source: F3dll.exe.dllReversingLabs: Detection: 23%
    Source: F3dll.exe.dllVirustotal: Detection: 34%Perma Link
    Source: Submited SampleIntegrated Neural Analysis Model: Matched 84.1% probability
    Source: F3dll.exe.dllJoe Sandbox ML: detected
    Source: F3dll.exe.dllStatic PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

    Networking

    barindex
    Source: Yara matchFile source: F3dll.exe.dll, type: SAMPLE

    System Summary

    barindex
    Source: F3dll.exe.dll, type: SAMPLEMatched rule: Detects known downloader agent Author: ditekSHen
    Source: F3dll.exe.dllBinary or memory string: OriginalFilenameClassLibrary1.dll< vs F3dll.exe.dll
    Source: F3dll.exe.dll, type: SAMPLEMatched rule: MALWARE_Win_DLAgent09 author = ditekSHen, description = Detects known downloader agent
    Source: classification engineClassification label: mal72.troj.evad.winDLL@6/0@0/0
    Source: C:\Windows\System32\conhost.exeMutant created: \Sessions\1\BaseNamedObjects\Local\SM0:2872:120:WilError_03
    Source: F3dll.exe.dllStatic PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
    Source: F3dll.exe.dllStatic file information: TRID: Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 50.14%
    Source: C:\Windows\System32\loaddll32.exeKey opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiersJump to behavior
    Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1
    Source: F3dll.exe.dllReversingLabs: Detection: 23%
    Source: F3dll.exe.dllVirustotal: Detection: 34%
    Source: unknownProcess created: C:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\F3dll.exe.dll"
    Source: C:\Windows\System32\loaddll32.exeProcess created: C:\Windows\System32\conhost.exe C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
    Source: C:\Windows\System32\loaddll32.exeProcess created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1
    Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1
    Source: C:\Windows\System32\loaddll32.exeProcess created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1Jump to behavior
    Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1Jump to behavior
    Source: C:\Windows\System32\loaddll32.exeSection loaded: apphelp.dllJump to behavior
    Source: C:\Windows\System32\loaddll32.exeSection loaded: kernel.appcore.dllJump to behavior
    Source: C:\Windows\SysWOW64\cmd.exeSection loaded: apphelp.dllJump to behavior
    Source: F3dll.exe.dllStatic PE information: data directory type: IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
    Source: F3dll.exe.dllStatic PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

    Data Obfuscation

    barindex
    Source: F3dll.exe.dll, Class1.cs.Net Code: ZxKHG System.AppDomain.Load(byte[])
    Source: C:\Windows\SysWOW64\rundll32.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
    Source: all processesThread injection, dropped files, key value created, disk infection and DNS query: no activity detected
    Source: C:\Windows\System32\conhost.exeLast function: Thread delayed
    Source: C:\Windows\System32\loaddll32.exeThread delayed: delay time: 120000Jump to behavior
    Source: F3dll.exe.dllBinary or memory string: vmtoolsd
    Source: all processesThread injection, dropped files, key value created, disk infection and DNS query: no activity detected
    Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1Jump to behavior
    ReconnaissanceResource DevelopmentInitial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact
    Gather Victim Identity InformationAcquire InfrastructureValid AccountsWindows Management Instrumentation1
    DLL Side-Loading
    11
    Process Injection
    1
    Rundll32
    OS Credential Dumping1
    Security Software Discovery
    Remote ServicesData from Local SystemData ObfuscationExfiltration Over Other Network MediumAbuse Accessibility Features
    CredentialsDomainsDefault AccountsScheduled Task/JobBoot or Logon Initialization Scripts1
    DLL Side-Loading
    1
    Virtualization/Sandbox Evasion
    LSASS Memory1
    Virtualization/Sandbox Evasion
    Remote Desktop ProtocolData from Removable MediaJunk DataExfiltration Over BluetoothNetwork Denial of Service
    Email AddressesDNS ServerDomain AccountsAtLogon Script (Windows)Logon Script (Windows)1
    Software Packing
    Security Account Manager1
    System Information Discovery
    SMB/Windows Admin SharesData from Network Shared DriveSteganographyAutomated ExfiltrationData Encrypted for Impact
    Employee NamesVirtual Private ServerLocal AccountsCronLogin HookLogin Hook11
    Process Injection
    NTDSSystem Network Configuration DiscoveryDistributed Component Object ModelInput CaptureProtocol ImpersonationTraffic DuplicationData Destruction
    Gather Victim Network InformationServerCloud AccountsLaunchdNetwork Logon ScriptNetwork Logon Script1
    DLL Side-Loading
    LSA SecretsInternet Connection DiscoverySSHKeyloggingFallback ChannelsScheduled TransferData Encrypted for Impact
    Hide Legend

    Legend:

    • Process
    • Signature
    • Created File
    • DNS/IP Info
    • Is Dropped
    • Is Windows Process
    • Number of created Registry Values
    • Number of created Files
    • Visual Basic
    • Delphi
    • Java
    • .Net C# or VB.NET
    • C, C++ or other language
    • Is malicious
    • Internet
    behaviorgraph top1 signatures2 2 Behavior Graph ID: 1523126 Sample: F3dll.exe.dll Startdate: 01/10/2024 Architecture: WINDOWS Score: 72 15 Malicious sample detected (through community Yara rule) 2->15 17 Multi AV Scanner detection for submitted file 2->17 19 .NET source code contains potential unpacker 2->19 21 3 other signatures 2->21 7 loaddll32.exe 1 2->7         started        process3 process4 9 cmd.exe 1 7->9         started        11 conhost.exe 7->11         started        process5 13 rundll32.exe 9->13         started       

    This section contains all screenshots as thumbnails, including those not shown in the slideshow.


    windows-stand
    SourceDetectionScannerLabelLink
    F3dll.exe.dll24%ReversingLabsWin32.Dropper.Generic
    F3dll.exe.dll34%VirustotalBrowse
    F3dll.exe.dll100%Joe Sandbox ML
    No Antivirus matches
    No Antivirus matches
    No Antivirus matches
    No Antivirus matches
    No contacted domains info
    No contacted IP infos
    Joe Sandbox version:41.0.0 Charoite
    Analysis ID:1523126
    Start date and time:2024-10-01 06:42:07 +02:00
    Joe Sandbox product:CloudBasic
    Overall analysis duration:0h 4m 21s
    Hypervisor based Inspection enabled:false
    Report type:full
    Cookbook file name:default.jbs
    Analysis system description:Windows 10 x64 22H2 with Office Professional Plus 2019, Chrome 117, Firefox 118, Adobe Reader DC 23, Java 8 Update 381, 7zip 23.01
    Run name:Run with higher sleep bypass
    Number of analysed new started processes analysed:8
    Number of new started drivers analysed:0
    Number of existing processes analysed:0
    Number of existing drivers analysed:0
    Number of injected processes analysed:0
    Technologies:
    • HCA enabled
    • EGA enabled
    • AMSI enabled
    Analysis Mode:default
    Analysis stop reason:Timeout
    Sample name:F3dll.exe.dll
    Detection:MAL
    Classification:mal72.troj.evad.winDLL@6/0@0/0
    EGA Information:Failed
    HCA Information:
    • Successful, ratio: 100%
    • Number of executed functions: 0
    • Number of non-executed functions: 0
    Cookbook Comments:
    • Found application associated with file extension: .dll
    • Sleeps bigger than 100000000ms are automatically reduced to 1000ms
    • Stop behavior analysis, all processes terminated
    • Exclude process from analysis (whitelisted): MpCmdRun.exe, WMIADAP.exe, SIHClient.exe, conhost.exe
    • Excluded domains from analysis (whitelisted): ocsp.digicert.com, slscr.update.microsoft.com, ctldl.windowsupdate.com, fe3cr.delivery.mp.microsoft.com
    • Not all processes where analyzed, report is missing behavior information
    No simulations
    No context
    No context
    No context
    No context
    No context
    No created / dropped files found
    File type:PE32 executable (DLL) (console) Intel 80386 Mono/.Net assembly, for MS Windows
    Entropy (8bit):4.631563176468829
    TrID:
    • Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 50.14%
    • Win32 Dynamic Link Library (generic) (1002004/3) 49.67%
    • Generic Win/DOS Executable (2004/3) 0.10%
    • DOS Executable Generic (2002/1) 0.10%
    • Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
    File name:F3dll.exe.dll
    File size:8'704 bytes
    MD5:02ae2c79bc656c9ab75f82ef03f49069
    SHA1:50a1110631b3a2c86730599edbfe205b01684361
    SHA256:d334f7d1af5388ab97f95f947ffe4e19e33b6221dcba5b89a67fb558392942a6
    SHA512:097cd45e4533d58cbe0a2c7704a56d19354d3e65da286c7c95a53ae2a2e33d5d79e1c39c740c6a070d49171dd2721fda2e4db0f8d027b087318e1b69b67cbb3e
    SSDEEP:192:lASL0ohRcy45Z5DRXi6gEdFF6BKFIs0H/:1DhRcy45TDRX/Rysa/
    TLSH:C302B60897E84631E9BE5F356C32A24142B6B653DF73DBAC08C0646D5C322158E71F71
    File Content Preview:MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$.......PE..L....I.f.........." ..P.............^8... ........... ....................................`................................
    Icon Hash:7ae282899bbab082
    Entrypoint:0x1000385e
    Entrypoint Section:.text
    Digitally signed:false
    Imagebase:0x10000000
    Subsystem:windows cui
    Image File Characteristics:EXECUTABLE_IMAGE, LARGE_ADDRESS_AWARE, DLL
    DLL Characteristics:HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
    Time Stamp:0x66FB49C0 [Tue Oct 1 01:00:48 2024 UTC]
    TLS Callbacks:
    CLR (.Net) Version:
    OS Version Major:4
    OS Version Minor:0
    File Version Major:4
    File Version Minor:0
    Subsystem Version Major:4
    Subsystem Version Minor:0
    Import Hash:dae02f32a21e03ce65412f6e56942daa
    Instruction
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    NameVirtual AddressVirtual Size Is in Section
    IMAGE_DIRECTORY_ENTRY_EXPORT0x00x0
    IMAGE_DIRECTORY_ENTRY_IMPORT0x380c0x4f.text
    IMAGE_DIRECTORY_ENTRY_RESOURCE0x40000x400.rsrc
    IMAGE_DIRECTORY_ENTRY_EXCEPTION0x00x0
    IMAGE_DIRECTORY_ENTRY_SECURITY0x00x0
    IMAGE_DIRECTORY_ENTRY_BASERELOC0x60000xc.reloc
    IMAGE_DIRECTORY_ENTRY_DEBUG0x00x0
    IMAGE_DIRECTORY_ENTRY_COPYRIGHT0x00x0
    IMAGE_DIRECTORY_ENTRY_GLOBALPTR0x00x0
    IMAGE_DIRECTORY_ENTRY_TLS0x00x0
    IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG0x00x0
    IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT0x00x0
    IMAGE_DIRECTORY_ENTRY_IAT0x20000x8.text
    IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT0x00x0
    IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR0x20080x48.text
    IMAGE_DIRECTORY_ENTRY_RESERVED0x00x0
    NameVirtual AddressVirtual SizeRaw SizeMD5Xored PEZLIB ComplexityFile TypeEntropyCharacteristics
    .text0x20000x18640x1a000672838573d44bf6b7a998f6fa415839False0.5216346153846154data5.180392942147002IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
    .rsrc0x40000x4000x400de5b8904977b3ef7e471e2d6bcb11c92False0.365234375data2.889412813597046IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
    .reloc0x60000xc0x2006aa1977e459ba6ab8df303f0ffedcb6cFalse0.044921875data0.08153941234324169IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ
    NameRVASizeTypeLanguageCountryZLIB Complexity
    RT_VERSION0x40580x33cdata0.41545893719806765
    DLLImport
    mscoree.dll_CorDllMain
    No network behavior found

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    Target ID:0
    Start time:00:42:57
    Start date:01/10/2024
    Path:C:\Windows\System32\loaddll32.exe
    Wow64 process (32bit):true
    Commandline:loaddll32.exe "C:\Users\user\Desktop\F3dll.exe.dll"
    Imagebase:0x5a0000
    File size:126'464 bytes
    MD5 hash:51E6071F9CBA48E79F10C84515AAE618
    Has elevated privileges:true
    Has administrator privileges:true
    Programmed in:C, C++ or other language
    Reputation:high
    Has exited:true

    Target ID:1
    Start time:00:42:57
    Start date:01/10/2024
    Path:C:\Windows\System32\conhost.exe
    Wow64 process (32bit):false
    Commandline:C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
    Imagebase:0x7ff7699e0000
    File size:862'208 bytes
    MD5 hash:0D698AF330FD17BEE3BF90011D49251D
    Has elevated privileges:true
    Has administrator privileges:true
    Programmed in:C, C++ or other language
    Reputation:high
    Has exited:true

    Target ID:2
    Start time:00:42:57
    Start date:01/10/2024
    Path:C:\Windows\SysWOW64\cmd.exe
    Wow64 process (32bit):true
    Commandline:cmd.exe /C rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1
    Imagebase:0x240000
    File size:236'544 bytes
    MD5 hash:D0FCE3AFA6AA1D58CE9FA336CC2B675B
    Has elevated privileges:true
    Has administrator privileges:true
    Programmed in:C, C++ or other language
    Reputation:high
    Has exited:true

    Target ID:3
    Start time:00:42:57
    Start date:01/10/2024
    Path:C:\Windows\SysWOW64\rundll32.exe
    Wow64 process (32bit):true
    Commandline:rundll32.exe "C:\Users\user\Desktop\F3dll.exe.dll",#1
    Imagebase:0x370000
    File size:61'440 bytes
    MD5 hash:889B99C52A60DD49227C5E485A016679
    Has elevated privileges:true
    Has administrator privileges:true
    Programmed in:C, C++ or other language
    Reputation:high
    Has exited:true

    No disassembly