Windows Analysis Report
YmAxTGvrQk.dll

Overview

General Information

Sample name: YmAxTGvrQk.dll
(renamed file extension from exe to dll, renamed because original name is a hash value)
Original sample name: b5814ee79455d77e2c48f889493fc3d8.dll.exe
Analysis ID: 1561763
MD5: b5814ee79455d77e2c48f889493fc3d8
SHA1: 03c82c5c3c7f4584f4ddb8001b29b26f1b7d864d
SHA256: cbb4f3d3777de27d21d97ac1e77e202630f4c35e39765d7e82bc10a58d3ee833
Tags: dllexeStrelaStealeruser-abuse_ch
Infos:

Detection

Strela Stealer
Score: 64
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Multi AV Scanner detection for submitted file
Yara detected Strela Stealer
AI detected suspicious sample
Machine Learning detection for sample
Contains functionality to query locales information (e.g. system language)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
PE file does not import any functions
Program does not show much activity (idle)
Registers a DLL
Sample execution stops while process was sleeping (likely an evasion)
Uses code obfuscation techniques (call, push, ret)

Classification

AV Detection
barindex
Multi AV Scanner detection for submitted file
Source: YmAxTGvrQk.dll ReversingLabs: Detection: 52%
AI detected suspicious sample
Source: Submited Sample Integrated Neural Analysis Model: Matched 95.5% probability
Machine Learning detection for sample
Source: YmAxTGvrQk.dll Joe Sandbox ML: detected
Source: YmAxTGvrQk.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT
Detected potential crypto function
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_00007FFE13241160 0_2_00007FFE13241160
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBA1A90 0_2_000001F3AEBA1A90
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBA15A0 0_2_000001F3AEBA15A0
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBA72BC 0_2_000001F3AEBA72BC
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBA1090 0_2_000001F3AEBA1090
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBAF4E8 0_2_000001F3AEBAF4E8
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026C72BC 3_2_026C72BC
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026C1A90 3_2_026C1A90
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CF4E8 3_2_026CF4E8
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026C1090 3_2_026C1090
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026C15A0 3_2_026C15A0
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_0000021509031090 4_2_0000021509031090
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903F4E8 4_2_000002150903F4E8
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_0000021509031A90 4_2_0000021509031A90
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_00000215090372BC 4_2_00000215090372BC
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_00000215090315A0 4_2_00000215090315A0
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA651090 5_2_000001A3CA651090
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65F4E8 5_2_000001A3CA65F4E8
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA6515A0 5_2_000001A3CA6515A0
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA6572BC 5_2_000001A3CA6572BC
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA651A90 5_2_000001A3CA651A90
PE file does not import any functions
Source: YmAxTGvrQk.dll Static PE information: No import functions for PE file found
Source: classification engine Classification label: mal64.troj.winDLL@10/0@0/0
Source: C:\Windows\System32\conhost.exe Mutant created: \Sessions\1\BaseNamedObjects\Local\SM0:7336:120:WilError_03
Source: YmAxTGvrQk.dll Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: C:\Windows\System32\loaddll64.exe Key opened: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: C:\Windows\System32\cmd.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1
Source: YmAxTGvrQk.dll ReversingLabs: Detection: 52%
Source: unknown Process created: C:\Windows\System32\loaddll64.exe loaddll64.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll"
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\conhost.exe C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\regsvr32.exe regsvr32.exe /s C:\Users\user\Desktop\YmAxTGvrQk.dll
Source: C:\Windows\System32\cmd.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\YmAxTGvrQk.dll,DllRegisterServer
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1 Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\regsvr32.exe regsvr32.exe /s C:\Users\user\Desktop\YmAxTGvrQk.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\YmAxTGvrQk.dll,DllRegisterServer Jump to behavior
Source: C:\Windows\System32\cmd.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1 Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: apphelp.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: wininet.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: textshaping.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: uxtheme.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: kernel.appcore.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: textinputframework.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: coreuicomponents.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: coremessaging.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: ntmarta.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: coremessaging.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: apphelp.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: aclayers.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: sfc.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: sfc_os.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: kernel.appcore.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: uxtheme.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: wininet.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: textshaping.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: textinputframework.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: coreuicomponents.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: coremessaging.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: ntmarta.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\regsvr32.exe Section loaded: wintypes.dll Jump to behavior
Source: C:\Windows\System32\loaddll64.exe Automated click: OK
Source: C:\Windows\System32\regsvr32.exe Automated click: OK
Source: Window Recorder Window detected: More than 3 window changes detected
Source: YmAxTGvrQk.dll Static PE information: Image base 0x180000000 > 0x60000000
Source: YmAxTGvrQk.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT
Registers a DLL
Source: C:\Windows\System32\loaddll64.exe Process created: C:\Windows\System32\regsvr32.exe regsvr32.exe /s C:\Users\user\Desktop\YmAxTGvrQk.dll
Uses code obfuscation techniques (call, push, ret)
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBACC35 push cs; retf 0000h 0_2_000001F3AEBACC59
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBACC6C push esi; retf 0000h 0_2_000001F3AEBACC6D
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBABBA2 push esp; ret 0_2_000001F3AEBABBA5
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBACCA8 push 6F0000CBh; retf 0_2_000001F3AEBACCAD
Source: C:\Windows\System32\loaddll64.exe Code function: 0_2_000001F3AEBACC9C push ebx; retf 0_2_000001F3AEBACC9D
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CBBA2 push esp; ret 3_2_026CBBA5
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CCC6C push esi; retf 0000h 3_2_026CCC6D
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CCC35 push cs; retf 0000h 3_2_026CCC59
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CCCA8 push 6F0000CBh; retf 3_2_026CCCAD
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026CCC9C push ebx; retf 3_2_026CCC9D
Source: C:\Windows\System32\regsvr32.exe Code function: 3_2_026D75DE push ecx; retf 003Fh 3_2_026D763E
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903CC9C push ebx; retf 4_2_000002150903CC9D
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903CCA8 push 6F0000CBh; retf 4_2_000002150903CCAD
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903BBA2 push esp; ret 4_2_000002150903BBA5
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903CC35 push cs; retf 0000h 4_2_000002150903CC59
Source: C:\Windows\System32\rundll32.exe Code function: 4_2_000002150903CC6C push esi; retf 0000h 4_2_000002150903CC6D
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65BBA2 push esp; ret 5_2_000001A3CA65BBA5
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65CC35 push cs; retf 0000h 5_2_000001A3CA65CC59
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65CCA8 push 6F0000CBh; retf 5_2_000001A3CA65CCAD
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65CC9C push ebx; retf 5_2_000001A3CA65CC9D
Source: C:\Windows\System32\rundll32.exe Code function: 5_2_000001A3CA65CC6C push esi; retf 0000h 5_2_000001A3CA65CC6D
Source: YmAxTGvrQk.dll Static PE information: section name: .text entropy: 6.80425120895919
Source: C:\Windows\System32\rundll32.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Windows\System32\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
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\System32\cmd.exe Process created: C:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\YmAxTGvrQk.dll",#1 Jump to behavior
Contains functionality to query locales information (e.g. system language)
Source: C:\Windows\System32\loaddll64.exe Code function: GetConsoleWindow,CreateThread,GetLocaleInfoA, 0_2_000001F3AEBA20E0
Source: C:\Windows\System32\regsvr32.exe Code function: CreateThread,GetLocaleInfoA, 3_2_026C20E0
Source: C:\Windows\System32\rundll32.exe Code function: CreateThread,GetLocaleInfoA, 4_2_00000215090320E0
Source: C:\Windows\System32\rundll32.exe Code function: CreateThread,GetLocaleInfoA, 5_2_000001A3CA6520E0

Stealing of Sensitive Information
barindex
Yara detected Strela Stealer
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 00000005.00000002.1751948158.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000005.00000002.1751603344.000001A3CA651000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000004.00000002.1751884781.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000000.00000002.1778400098.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000004.00000002.1751707509.0000021509031000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000003.00000002.1750393412.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000003.00000002.1749542743.00000000026C1000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000000.00000002.1777872156.000001F3AEBA1000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: loaddll64.exe PID: 7328, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: regsvr32.exe PID: 7388, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: rundll32.exe PID: 7404, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: rundll32.exe PID: 7412, type: MEMORYSTR

Remote Access Functionality
barindex
Yara detected Strela Stealer
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 0.2.loaddll64.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 4.2.rundll32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13246404.1.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13246404.1.raw.unpack, type: UNPACKEDPE
Source: Yara match File source: 5.2.rundll32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 3.2.regsvr32.exe.7ffe13240000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 00000005.00000002.1751948158.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000005.00000002.1751603344.000001A3CA651000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000004.00000002.1751884781.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000000.00000002.1778400098.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000004.00000002.1751707509.0000021509031000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000003.00000002.1750393412.00007FFE13246000.00000004.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: 00000003.00000002.1749542743.00000000026C1000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: 00000000.00000002.1777872156.000001F3AEBA1000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: loaddll64.exe PID: 7328, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: regsvr32.exe PID: 7388, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: rundll32.exe PID: 7404, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: rundll32.exe PID: 7412, type: MEMORYSTR
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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: 1561763 Sample: YmAxTGvrQk.exe Startdate: 24/11/2024 Architecture: WINDOWS Score: 64 19 Multi AV Scanner detection for submitted file 2->19 21 Yara detected Strela Stealer 2->21 23 Machine Learning detection for sample 2->23 25 AI detected suspicious sample 2->25 7 loaddll64.exe 1 2->7         started        process3 process4 9 cmd.exe 1 7->9         started        11 regsvr32.exe 7->11         started        13 rundll32.exe 7->13         started        15 conhost.exe 7->15         started        process5 17 rundll32.exe 9->17         started       
⊘No contacted IP infos