Windows Analysis Report
WebCompanion.dll

Overview

General Information

Sample name: WebCompanion.dll
Analysis ID: 1431812
MD5: 34c69daef314154af848b3c73c60e2cc
SHA1: 95c4eaecb8a6ca0ddd2fa13d83ccd3a64589ccb7
SHA256: 543e02fe9b683f89dcc3f838c1ec17c8822c3da7b69da132ec13f0000c547a80
Infos:

Detection

Score: 56
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Multi AV Scanner detection for submitted file
.NET source code contains potential unpacker
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
Uses 32bit PE files

Classification

AV Detection
barindex
Multi AV Scanner detection for submitted file
Source: WebCompanion.dll ReversingLabs: Detection: 23%
Uses 32bit PE files
Source: WebCompanion.dll Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE, DLL
Source: WebCompanion.dll Static PE information: certificate valid
Source: WebCompanion.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
Source: Binary string: c:\dev\sqlite\dotnet\obj\2008\Release\System.Data.SQLite.pdbX. source: WebCompanion.dll
Source: Binary string: c:\Development\Releases\Json\Working\Newtonsoft.Json\Src\Newtonsoft.Json\obj\Release\Newtonsoft.Json.pdb source: WebCompanion.dll
Source: Binary string: c:\dev\sqlite\dotnet\obj\2008\Release\System.Data.SQLite.pdb source: WebCompanion.dll
Source: Binary string: Z:\Documents\bidmonitor\web-companion\WebCompanion\bin\Release\Dotfuscated\WebCompanion.Merged.pdb source: WebCompanion.dll
Source: Binary string: d:\Projects\lz4net\src\LZ4.net2\obj\Release\LZ4.pdb source: WebCompanion.dll
Source: Binary string: Z:\Documents\bidmonitor\web-companion\WebCompanion\bin\Release\Dotfuscated\WebCompanion.Merged.pdb, source: WebCompanion.dll

Networking
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Yara detected Generic Downloader
Source: Yara match File source: WebCompanion.dll, type: SAMPLE
Source: WebCompanion.dll String found in binary or memory: http://aia.entrust.net/evcs1-chain256.cer01
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertAssuredIDRootCA.crt0
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertAssuredIDRootCA.crt0E
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertSHA2AssuredIDTimestampingCA.crt0
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertTrustedG4CodeSigningRSA4096SHA3842021CA1.crt0
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertTrustedG4RSA4096SHA256TimeStampingCA.crt0
Source: WebCompanion.dll String found in binary or memory: http://cacerts.digicert.com/DigiCertTrustedRootG4.crt0C
Source: WebCompanion.dll String found in binary or memory: http://crl.entrust.net/evcs1.crl0
Source: WebCompanion.dll String found in binary or memory: http://crl.entrust.net/g2ca.crl0;
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/DigiCertAssuredIDRootCA.crl0
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/DigiCertAssuredIDRootCA.crl0P
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/DigiCertTrustedG4CodeSigningRSA4096SHA3842021CA1.crl0S
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/DigiCertTrustedG4RSA4096SHA256TimeStampingCA.crl0
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/DigiCertTrustedRootG4.crl0
Source: WebCompanion.dll String found in binary or memory: http://crl3.digicert.com/sha2-assured-ts.crl02
Source: WebCompanion.dll String found in binary or memory: http://crl4.digicert.com/DigiCertAssuredIDRootCA.crl0:
Source: WebCompanion.dll String found in binary or memory: http://crl4.digicert.com/DigiCertTrustedG4CodeSigningRSA4096SHA3842021CA1.crl0=
Source: WebCompanion.dll String found in binary or memory: http://crl4.digicert.com/sha2-assured-ts.crl0
Source: WebCompanion.dll String found in binary or memory: http://dkf201.com%http://wzp9182.comIhttp://d2vtta4ibs40qt.cloudfront.netI1f667d94-35d0-4958-aa21-54
Source: WebCompanion.dll String found in binary or memory: http://james.newtonking.com/projects/json
Source: WebCompanion.dll String found in binary or memory: http://ocsp.digicert.com0
Source: WebCompanion.dll String found in binary or memory: http://ocsp.digicert.com0A
Source: WebCompanion.dll String found in binary or memory: http://ocsp.digicert.com0C
Source: WebCompanion.dll String found in binary or memory: http://ocsp.digicert.com0O
Source: WebCompanion.dll String found in binary or memory: http://ocsp.digicert.com0X
Source: WebCompanion.dll String found in binary or memory: http://ocsp.entrust.net00
Source: WebCompanion.dll String found in binary or memory: http://ocsp.entrust.net05
Source: WebCompanion.dll String found in binary or memory: http://rt.webcompanion.com/notifications/download/rt/searchenginetemplate.xml
Source: WebCompanion.dll String found in binary or memory: http://system.data.sqlite.org/
Source: WebCompanion.dll String found in binary or memory: http://system.data.sqlite.org/X
Source: WebCompanion.dll String found in binary or memory: http://www.digicert.com/CPS0
Source: WebCompanion.dll String found in binary or memory: http://www.entrust.net/rpa0
Source: WebCompanion.dll String found in binary or memory: http://www.mozilla.org/2006/browser/search/=//msbld:Url
Source: WebCompanion.dll String found in binary or memory: https://search-get.com/wc/search?q=
Source: WebCompanion.dll String found in binary or memory: https://www.digicert.com/CPS0
Source: WebCompanion.dll String found in binary or memory: https://www.entrust.net/rpa0
Source: WebCompanion.dll String found in binary or memory: https://www.search-get.com/favicon.ico
Sample file is different than original file name gathered from version info
Source: WebCompanion.dll Binary or memory string: OriginalFilenameICSharpCode.SharpZipLib.dll8 vs WebCompanion.dll
Source: WebCompanion.dll Binary or memory string: OriginalFilenameLZ4.dll( vs WebCompanion.dll
Source: WebCompanion.dll Binary or memory string: OriginalFilenameNewtonsoft.Json.dll4 vs WebCompanion.dll
Source: WebCompanion.dll Binary or memory string: OriginalFilenameSystem.Data.SQLite.dllH vs WebCompanion.dll
Uses 32bit PE files
Source: WebCompanion.dll Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE, DLL
Source: WebCompanion.dll, ac.cs Cryptographic APIs: 'TransformBlock'
Source: WebCompanion.dll, InflaterInputBuffer.cs Cryptographic APIs: 'TransformBlock'
Source: WebCompanion.dll, DeflaterOutputStream.cs Cryptographic APIs: 'TransformBlock'
Source: WebCompanion.dll, Scheduler.cs Task registration methods: 'CreateLogonScheduledTask'
Source: WebCompanion.dll, Scheduler.cs Security API names: System.Security.Principal.WindowsIdentity.GetCurrent()
Source: WebCompanion.dll, FileHelper.cs Security API names: System.IO.FileInfo.SetAccessControl(System.Security.AccessControl.FileSecurity)
Source: WebCompanion.dll, FileHelper.cs Security API names: System.IO.FileInfo.GetAccessControl()
Source: WebCompanion.dll, FileHelper.cs Security API names: System.Security.AccessControl.FileSystemSecurity.AddAccessRule(System.Security.AccessControl.FileSystemAccessRule)
Source: classification engine Classification label: mal56.troj.evad.winDLL@6/0@0/0
Source: C:\Windows\System32\conhost.exe Mutant created: \Sessions\1\BaseNamedObjects\Local\SM0:7348:120:WilError_03
Source: WebCompanion.dll Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: WebCompanion.dll Static file information: TRID: Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 44.58%
Source: C:\Windows\System32\loaddll32.exe Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1
Source: WebCompanion.dll ReversingLabs: Detection: 23%
Source: unknown Process created: C:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\WebCompanion.dll"
Source: C:\Windows\System32\loaddll32.exe Process created: C:\Windows\System32\conhost.exe C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
Source: C:\Windows\System32\loaddll32.exe Process created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1
Source: C:\Windows\System32\loaddll32.exe Process created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1 Jump to behavior
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1 Jump to behavior
Source: C:\Windows\System32\loaddll32.exe Section loaded: apphelp.dll Jump to behavior
Source: C:\Windows\System32\loaddll32.exe Section loaded: kernel.appcore.dll Jump to behavior
Source: C:\Windows\SysWOW64\cmd.exe Section loaded: apphelp.dll Jump to behavior
Source: WebCompanion.dll Static PE information: certificate valid
Source: WebCompanion.dll Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
Source: WebCompanion.dll Static PE information: Virtual size of .text is bigger than: 0x100000
Source: WebCompanion.dll Static file information: File size 3857728 > 1048576
Source: WebCompanion.dll Static PE information: Raw size of .text is bigger than: 0x100000 < 0x3aa600
Source: WebCompanion.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
Source: WebCompanion.dll Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_DEBUG
Source: Binary string: c:\dev\sqlite\dotnet\obj\2008\Release\System.Data.SQLite.pdbX. source: WebCompanion.dll
Source: Binary string: c:\Development\Releases\Json\Working\Newtonsoft.Json\Src\Newtonsoft.Json\obj\Release\Newtonsoft.Json.pdb source: WebCompanion.dll
Source: Binary string: c:\dev\sqlite\dotnet\obj\2008\Release\System.Data.SQLite.pdb source: WebCompanion.dll
Source: Binary string: Z:\Documents\bidmonitor\web-companion\WebCompanion\bin\Release\Dotfuscated\WebCompanion.Merged.pdb source: WebCompanion.dll
Source: Binary string: d:\Projects\lz4net\src\LZ4.net2\obj\Release\LZ4.pdb source: WebCompanion.dll
Source: Binary string: Z:\Documents\bidmonitor\web-companion\WebCompanion\bin\Release\Dotfuscated\WebCompanion.Merged.pdb, source: WebCompanion.dll

Data Obfuscation
barindex
.NET source code contains potential unpacker
Source: WebCompanion.dll, d1.cs .Net Code: dz
Source: WebCompanion.dll, dq.cs .Net Code: a
Source: WebCompanion.dll, Scheduler.cs .Net Code: CreateLogonScheduledTask
Source: C:\Windows\SysWOW64\rundll32.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Program does not show much activity (idle)
Source: all processes Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected
Sample execution stops while process was sleeping (likely an evasion)
Source: C:\Windows\System32\conhost.exe Last function: Thread delayed
Source: C:\Windows\System32\loaddll32.exe Thread delayed: delay time: 120000 Jump to behavior
Program does not show much activity (idle)
Source: all processes Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected
Creates a process in suspended mode (likely to inject code)
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\WebCompanion.dll",#1 Jump to behavior
windows-stand
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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: 1431812 Sample: WebCompanion.dll Startdate: 25/04/2024 Architecture: WINDOWS Score: 56 15 Multi AV Scanner detection for submitted file 2->15 17 .NET source code contains potential unpacker 2->17 19 Yara detected Generic Downloader 2->19 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       
⊘No contacted IP infos