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Windows Analysis Report
file.dll

Overview

General Information

Sample name:file.dll
Analysis ID:1563908
MD5:3d76ef15ab712b93eabd4b68ea0111d5
SHA1:0f309663fae17c4ccae983e1fabb16a1e5f77d9b
SHA256:1802e16379d96021fee05f583633c8091bb669350b7d32064179a8944d45a5a6
Tags:NETdllMSILuser-jstrosch
Infos:

Detection

Score:68
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
.NET source code contains potential unpacker
AI detected suspicious sample
Machine Learning detection for sample
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

Classification

  • System is w10x64
  • loaddll32.exe (PID: 5924 cmdline: loaddll32.exe "C:\Users\user\Desktop\file.dll" MD5: 51E6071F9CBA48E79F10C84515AAE618)
    • conhost.exe (PID: 5460 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: 0D698AF330FD17BEE3BF90011D49251D)
    • cmd.exe (PID: 5500 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\file.dll",#1 MD5: D0FCE3AFA6AA1D58CE9FA336CC2B675B)
      • rundll32.exe (PID: 6752 cmdline: rundll32.exe "C:\Users\user\Desktop\file.dll",#1 MD5: 889B99C52A60DD49227C5E485A016679)
  • cleanup
No configs have been found
No yara matches
No Sigma rule has matched
No Suricata rule has matched

Click to jump to signature section

Show All Signature Results

AV Detection

barindex
Source: file.dllAvira: detected
Source: file.dllReversingLabs: Detection: 55%
Source: Submited SampleIntegrated Neural Analysis Model: Matched 99.4% probability
Source: file.dllJoe Sandbox ML: detected
Source: file.dllStatic PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
Source: file.dllBinary or memory string: OriginalFilenameStartupManager.dll> vs file.dll
Source: file.dll, Helper.csCryptographic APIs: 'TransformFinalBlock'
Source: file.dll, Helper.csCryptographic APIs: 'TransformFinalBlock'
Source: file.dll, ITaskFolder.csTask registration methods: 'RegisterTaskDefinition', 'RegisterTask'
Source: file.dll, TaskFolder.csTask registration methods: 'RegisterTaskDefinition', 'RegisterTask', 'CreateFolder'
Source: file.dll, Task.csTask registration methods: 'RegisterChanges'
Source: classification engineClassification label: mal68.evad.winDLL@6/0@0/0
Source: C:\Windows\System32\conhost.exeMutant created: \Sessions\1\BaseNamedObjects\Local\SM0:5460:120:WilError_03
Source: file.dllStatic PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: file.dllStatic file information: TRID: Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 49.76%
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\file.dll",#1
Source: file.dllReversingLabs: Detection: 55%
Source: unknownProcess created: C:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\file.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\file.dll",#1
Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\file.dll",#1
Source: C:\Windows\System32\loaddll32.exeProcess created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\file.dll",#1Jump to behavior
Source: C:\Windows\SysWOW64\cmd.exeProcess created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\file.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: file.dllStatic PE information: data directory type: IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
Source: file.dllStatic PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Data Obfuscation

barindex
Source: file.dll, Trigger.cs.Net Code: GetBestTimeSpanString
Source: file.dll, Task.cs.Net Code: ShowEditor
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: 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\file.dll",#1Jump to behavior
ReconnaissanceResource DevelopmentInitial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionCommand and ControlExfiltrationImpact
Gather Victim Identity InformationAcquire InfrastructureValid Accounts1
Scheduled Task/Job
1
Scheduled Task/Job
11
Process Injection
1
Rundll32
OS Credential Dumping1
Virtualization/Sandbox Evasion
Remote Services1
Archive Collected Data
Data ObfuscationExfiltration Over Other Network MediumAbuse Accessibility Features
CredentialsDomainsDefault AccountsScheduled Task/Job1
DLL Side-Loading
1
Scheduled Task/Job
1
Virtualization/Sandbox Evasion
LSASS Memory1
System Information Discovery
Remote Desktop ProtocolData from Removable MediaJunk DataExfiltration Over BluetoothNetwork Denial of Service
Email AddressesDNS ServerDomain AccountsAtLogon Script (Windows)1
DLL Side-Loading
1
Software Packing
Security Account ManagerQuery RegistrySMB/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
Deobfuscate/Decode Files or Information
LSA SecretsInternet Connection DiscoverySSHKeyloggingFallback ChannelsScheduled TransferData Encrypted for Impact
Domain PropertiesBotnetReplication Through Removable MediaScheduled TaskRC ScriptsRC Scripts1
DLL Side-Loading
Cached Domain CredentialsWi-Fi DiscoveryVNCGUI Input CaptureMultiband CommunicationData Transfer Size LimitsService Stop
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: 1563908 Sample: file.dll Startdate: 27/11/2024 Architecture: WINDOWS Score: 68 15 Antivirus / Scanner detection for submitted sample 2->15 17 Multi AV Scanner detection for submitted file 2->17 19 .NET source code contains potential unpacker 2->19 21 2 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
file.dll55%ReversingLabsWin32.Trojan.Generic
file.dll100%AviraTR/AVI.Agent.xacmi
file.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:1563908
Start date and time:2024-11-27 16:19:58 +01:00
Joe Sandbox product:CloudBasic
Overall analysis duration:0h 2m 2s
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
Number of analysed new started processes analysed:4
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:file.dll
Detection:MAL
Classification:mal68.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
  • Stop behavior analysis, all processes terminated
  • Not all processes where analyzed, report is missing behavior information
  • VT rate limit hit for: file.dll
TimeTypeDescription
10:20:56API Interceptor1x Sleep call for process: loaddll32.exe modified
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):5.890887827701329
TrID:
  • Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 49.76%
  • Win32 Dynamic Link Library (generic) (1002004/3) 49.29%
  • Windows Screen Saver (13104/52) 0.64%
  • Win16/32 Executable Delphi generic (2074/23) 0.10%
  • Generic Win/DOS Executable (2004/3) 0.10%
File name:file.dll
File size:193'024 bytes
MD5:3d76ef15ab712b93eabd4b68ea0111d5
SHA1:0f309663fae17c4ccae983e1fabb16a1e5f77d9b
SHA256:1802e16379d96021fee05f583633c8091bb669350b7d32064179a8944d45a5a6
SHA512:6c0d0291abb696bee33b6e42392b07028c82bcffc8fb7934ba234f178f011ab14fde38cdccb322c8dba058ae66fc023349de5db1c587d3417709bf263cfd28f3
SSDEEP:3072:7ITmgSRcBHAt+yM1KlUKEHBAnpK37nXnF8KBOQv174Syoh2sKdm/vl7bQcX1Okta:7MmgSRcBHAt+yM1KlU18g1xNYVc
TLSH:75143A5067E4C92BEB7F13B8E47216146774F44BA622EB8A38CC15FA5B2334059163BF
File Content Preview:MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$.......PE..L......e........... ..................... ... ....@.. .......................`............@................................
Icon Hash:7ae282899bbab082
Entrypoint:0x4309ca
Entrypoint Section:.text
Digitally signed:false
Imagebase:0x400000
Subsystem:windows cui
Image File Characteristics:EXECUTABLE_IMAGE, DLL
DLL Characteristics:DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
Time Stamp:0x65E8DF9F [Wed Mar 6 21:26:55 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
jmp dword ptr [004309D8h]
add byte ptr [eax], al
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lodsb
or dword ptr [ebx], eax
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NameVirtual AddressVirtual Size Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT0x00x0
IMAGE_DIRECTORY_ENTRY_IMPORT0x3097c0x4c.text
IMAGE_DIRECTORY_ENTRY_RESOURCE0x320000x3a4.rsrc
IMAGE_DIRECTORY_ENTRY_EXCEPTION0x00x0
IMAGE_DIRECTORY_ENTRY_SECURITY0x00x0
IMAGE_DIRECTORY_ENTRY_BASERELOC0x340000xc.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_IAT0x309d80x8.text
IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT0x00x0
IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR0x20000x48.text
IMAGE_DIRECTORY_ENTRY_RESERVED0x00x0
NameVirtual AddressVirtual SizeRaw SizeMD5Xored PEZLIB ComplexityFile TypeEntropyCharacteristics
.text0x20000x2e9e00x2ea0046a9200fb6612289df6713541e11b5a6False0.3847918063002681data5.918607977336782IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
.rsrc0x320000x3a40x40008285c04e4aa277fb2c69f6153013f7eFalse0.3671875data2.9149204303738223IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ
.reloc0x340000xc0x200f5f90f06f1d9e059ae8bc181b492f701False0.044921875data0.08153941234324169IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ
NameRVASizeTypeLanguageCountryZLIB Complexity
RT_VERSION0x320580x34cdata0.41113744075829384
DLLImport
mscoree.dll_CorDllMain
No network behavior found

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Target ID:0
Start time:10:20:56
Start date:27/11/2024
Path:C:\Windows\System32\loaddll32.exe
Wow64 process (32bit):true
Commandline:loaddll32.exe "C:\Users\user\Desktop\file.dll"
Imagebase:0xcd0000
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:10:20:56
Start date:27/11/2024
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:10:20:56
Start date:27/11/2024
Path:C:\Windows\SysWOW64\cmd.exe
Wow64 process (32bit):true
Commandline:cmd.exe /C rundll32.exe "C:\Users\user\Desktop\file.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:10:20:56
Start date:27/11/2024
Path:C:\Windows\SysWOW64\rundll32.exe
Wow64 process (32bit):true
Commandline:rundll32.exe "C:\Users\user\Desktop\file.dll",#1
Imagebase:0xae0000
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