Windows Analysis Report
ZlucX8xpYB.dll

Overview

General Information

Sample name: ZlucX8xpYB.dll
renamed because original name is a hash value
Original sample name: f33f55bc2eeb3926459be0ee9dcb024f27e31b752a5dbb753c546ce46684503c.dll
Analysis ID: 1447643
MD5: 36ae45161a9e2b60025b91fae42f1352
SHA1: 8e0faf735dfbed33027803db4fbb99321b3a25fb
SHA256: f33f55bc2eeb3926459be0ee9dcb024f27e31b752a5dbb753c546ce46684503c
Tags: dllvenomrat
Infos:

Detection

AsyncRAT, DarkTortilla
Score: 80
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Yara detected AsyncRAT
Yara detected DarkTortilla Crypter
Machine Learning detection for sample
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Binary contains a suspicious time stamp
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
Yara signature match

Classification

Name Description Attribution Blogpost URLs Link
AsyncRAT AsyncRAT is a Remote Access Tool (RAT) designed to remotely monitor and control other computers through a secure encrypted connection. It is an open source remote administration tool, however, it could also be used maliciously because it provides functionality such as keylogger, remote desktop control, and many other functions that may cause harm to the victims computer. In addition, AsyncRAT can be delivered via various methods such as spear-phishing, malvertising, exploit kit and other techniques. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/win.asyncrat
Name Description Attribution Blogpost URLs Link
DarkTortilla DarkTortilla is a complex and highly configurable .NET-based crypter that has possibly been active since at least August 2015. It typically delivers popular information stealers and remote access trojans (RATs) such as AgentTesla, AsyncRat, NanoCore, and RedLine. While it appears to primarily deliver commodity malware, Secureworks Counter Threat Unit (CTU) researchers identified DarkTortilla samples delivering targeted payloads such as Cobalt Strike and Metasploit. It can also deliver "addon packages" such as additional malicious payloads, benign decoy documents, and executables. It features robust anti-analysis and anti-tamper controls that can make detection, analysis, and eradication challenging.From January 2021 through May 2022, an average of 93 unique DarkTortilla samples per week were uploaded to the VirusTotal analysis service. Code similarities suggest possible links between DarkTortilla and other malware: a crypter operated by the RATs Crew threat group, which was active between 2008 and 2012, and the Gameloader malware that emerged in 2021. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/win.darktortilla

AV Detection
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Multi AV Scanner detection for submitted file
Source: ZlucX8xpYB.dll Virustotal: Detection: 21% Perma Link
Machine Learning detection for sample
Source: ZlucX8xpYB.dll Joe Sandbox ML: detected
Uses 32bit PE files
Source: ZlucX8xpYB.dll Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE, DLL
Source: ZlucX8xpYB.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Key, Mouse, Clipboard, Microphone and Screen Capturing
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Yara detected AsyncRAT
Source: Yara match File source: ZlucX8xpYB.dll, type: SAMPLE

System Summary
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Malicious sample detected (through community Yara rule)
Source: ZlucX8xpYB.dll, type: SAMPLE Matched rule: Detects executables attemping to enumerate video devices using WMI Author: ditekSHen
Sample file is different than original file name gathered from version info
Source: ZlucX8xpYB.dll Binary or memory string: OriginalFilenameClientx64.exe" vs ZlucX8xpYB.dll
Uses 32bit PE files
Source: ZlucX8xpYB.dll Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE, DLL
Yara signature match
Source: ZlucX8xpYB.dll, type: SAMPLE Matched rule: INDICATOR_SUSPICIOUS_EXE_WMI_EnumerateVideoDevice author = ditekSHen, description = Detects executables attemping to enumerate video devices using WMI
Source: classification engine Classification label: mal80.troj.evad.winDLL@6/0@0/0
Source: C:\Windows\System32\conhost.exe Mutant created: \Sessions\1\BaseNamedObjects\Local\SM0:3328:120:WilError_03
Source: ZlucX8xpYB.dll Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: ZlucX8xpYB.dll Static file information: TRID: Win32 Dynamic Link Library (generic) Net Framework (1011504/3) 49.81%
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\ZlucX8xpYB.dll",#1
Source: ZlucX8xpYB.dll Virustotal: Detection: 21%
Source: unknown Process created: C:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\ZlucX8xpYB.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\ZlucX8xpYB.dll",#1
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\ZlucX8xpYB.dll",#1
Source: C:\Windows\System32\loaddll32.exe Process created: C:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\ZlucX8xpYB.dll",#1 Jump to behavior
Source: C:\Windows\SysWOW64\cmd.exe Process created: C:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\ZlucX8xpYB.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: ZlucX8xpYB.dll Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
Source: ZlucX8xpYB.dll Static file information: File size 2513743 > 1048576
Source: ZlucX8xpYB.dll Static PE information: Raw size of .reloc is bigger than: 0x100000 < 0x223b4f
Source: ZlucX8xpYB.dll Static PE information: HIGH_ENTROPY_VA, DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Data Obfuscation
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Yara detected DarkTortilla Crypter
Source: Yara match File source: ZlucX8xpYB.dll, type: SAMPLE
Binary contains a suspicious time stamp
Source: ZlucX8xpYB.dll Static PE information: 0xD3B90B0C [Fri Jul 24 11:52:44 2082 UTC]

Boot Survival
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Yara detected AsyncRAT
Source: Yara match File source: ZlucX8xpYB.dll, type: SAMPLE
Source: C:\Windows\SysWOW64\rundll32.exe Process information set: NOOPENFILEERRORBOX Jump to behavior

Malware Analysis System Evasion
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Yara detected AsyncRAT
Source: Yara match File source: ZlucX8xpYB.dll, type: SAMPLE
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Source: ZlucX8xpYB.dll Binary or memory string: TASKMGR.EXE#PROCESSHACKER.EXE
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\ZlucX8xpYB.dll",#1 Jump to behavior

Lowering of HIPS / PFW / Operating System Security Settings
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Yara detected AsyncRAT
Source: Yara match File source: ZlucX8xpYB.dll, type: SAMPLE
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Legend:

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  • Signature
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  • 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: 1447643 Sample: ZlucX8xpYB.dll Startdate: 26/05/2024 Architecture: WINDOWS Score: 80 15 Malicious sample detected (through community Yara rule) 2->15 17 Multi AV Scanner detection for submitted file 2->17 19 Yara detected DarkTortilla Crypter 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       
⊘No contacted IP infos