Windows Analysis Report
bUrP.exe

Overview

General Information

Sample name: bUrP.exe
Analysis ID: 1415997
MD5: 8cc1d92a748e389e44e4d2757e0c276f
SHA1: 314bf49942c9576ec1e6237985a770a891c91380
SHA256: 1e5a837d5e69be8d6e3eb8143e4d96204b5116b5426df20acd769506ab4b3d6f
Tags: exexworm
Infos:

Detection

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

Signatures

Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Yara detected XWorm
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
C2 URLs / IPs found in malware configuration
Machine Learning detection for sample
Sample uses string decryption to hide its real strings
Sigma detected: Potentially Suspicious Malware Callback Communication
Uses dynamic DNS services
Allocates memory with a write watch (potentially for evading sandboxes)
Detected TCP or UDP traffic on non-standard ports
Enables debug privileges
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample file is different than original file name gathered from version info
Tries to load missing DLLs
Uses 32bit PE files
Yara signature match

Classification

AV Detection
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Antivirus / Scanner detection for submitted sample
Source: bUrP.exe Avira: detected
Antivirus detection for URL or domain
Source: dzn.ddns.net Avira URL Cloud: Label: malware
Found malware configuration
Source: bUrP.exe Malware Configuration Extractor: Xworm {"C2 url": ["dzn.ddns.net"], "Port": "5552", "Aes key": "<123456789>", "Install file": "USB.exe", "Version": "XWorm V3.1"}
Multi AV Scanner detection for submitted file
Source: bUrP.exe ReversingLabs: Detection: 76%
Machine Learning detection for sample
Source: bUrP.exe Joe Sandbox ML: detected
Sample uses string decryption to hide its real strings
Source: bUrP.exe String decryptor: dzn.ddns.net
Source: bUrP.exe String decryptor: 5552
Source: bUrP.exe String decryptor: <123456789>
Source: bUrP.exe String decryptor: <Xwormmm>
Source: bUrP.exe String decryptor: USB.exe
Uses 32bit PE files
Source: bUrP.exe Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE
Source: bUrP.exe Static PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Networking
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C2 URLs / IPs found in malware configuration
Source: Malware configuration extractor URLs: dzn.ddns.net
Uses dynamic DNS services
Source: unknown DNS query: name: dzn.ddns.net
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.4:49729 -> 191.233.27.50:5552
Internet Provider seen in connection with other malware
Source: Joe Sandbox View ASN Name: MICROSOFT-CORP-MSN-AS-BLOCKUS MICROSOFT-CORP-MSN-AS-BLOCKUS
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown DNS traffic detected: queries for: dzn.ddns.net

System Summary
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Malicious sample detected (through community Yara rule)
Source: bUrP.exe, type: SAMPLE Matched rule: Detects AsyncRAT Author: ditekSHen
Source: 0.0.bUrP.exe.580000.0.unpack, type: UNPACKEDPE Matched rule: Detects AsyncRAT Author: ditekSHen
Source: 00000000.00000000.1618143277.0000000000582000.00000002.00000001.01000000.00000003.sdmp, type: MEMORY Matched rule: Detects AsyncRAT Author: ditekSHen
Sample file is different than original file name gathered from version info
Source: bUrP.exe, 00000000.00000000.1618157418.000000000058A000.00000002.00000001.01000000.00000003.sdmp Binary or memory string: OriginalFilenameXClient.exe4 vs bUrP.exe
Source: bUrP.exe Binary or memory string: OriginalFilenameXClient.exe4 vs bUrP.exe
Tries to load missing DLLs
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: mscoree.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: apphelp.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: kernel.appcore.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: version.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: vcruntime140_clr0400.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: ucrtbase_clr0400.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: ucrtbase_clr0400.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: uxtheme.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: cryptsp.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: rsaenh.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: cryptbase.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: sspicli.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: windows.storage.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: wldp.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: profapi.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: mswsock.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: dnsapi.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: iphlpapi.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: rasadhlp.dll Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Section loaded: fwpuclnt.dll Jump to behavior
Uses 32bit PE files
Source: bUrP.exe Static PE information: EXECUTABLE_IMAGE, 32BIT_MACHINE
Yara signature match
Source: bUrP.exe, type: SAMPLE Matched rule: MALWARE_Win_AsyncRAT author = ditekSHen, description = Detects AsyncRAT
Source: 0.0.bUrP.exe.580000.0.unpack, type: UNPACKEDPE Matched rule: MALWARE_Win_AsyncRAT author = ditekSHen, description = Detects AsyncRAT
Source: 00000000.00000000.1618143277.0000000000582000.00000002.00000001.01000000.00000003.sdmp, type: MEMORY Matched rule: MALWARE_Win_AsyncRAT author = ditekSHen, description = Detects AsyncRAT
Source: bUrP.exe, Helper.cs Cryptographic APIs: 'TransformFinalBlock'
Source: bUrP.exe, Helper.cs Cryptographic APIs: 'TransformFinalBlock'
Source: bUrP.exe, AlgorithmAES.cs Cryptographic APIs: 'TransformFinalBlock'
Source: classification engine Classification label: mal100.troj.evad.winEXE@1/0@4/1
Source: C:\Users\user\Desktop\bUrP.exe Mutant created: \Sessions\1\BaseNamedObjects\JD7Bbn5DlVw5Yl4J
Source: C:\Users\user\Desktop\bUrP.exe Mutant created: NULL
Source: bUrP.exe Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: bUrP.exe Static file information: TRID: Win32 Executable (generic) Net Framework (10011505/4) 49.80%
Source: C:\Users\user\Desktop\bUrP.exe Key opened: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: bUrP.exe ReversingLabs: Detection: 76%
Source: bUrP.exe Static PE information: data directory type: IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR
Source: bUrP.exe Static PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Data Obfuscation
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.NET source code contains method to dynamically call methods (often used by packers)
Source: bUrP.exe, Messages.cs .Net Code: NewLateBinding.LateCall(obj, (Type)null, "Invoke", new object[2]{null,new object[5]{Settings.Host,Settings.Port,Settings.SPL,Settings.KEY,Helper.ID()}}, (string[])null, (Type[])null, (bool[])null, true)
Source: bUrP.exe, Messages.cs .Net Code: NewLateBinding.LateCall(obj, (Type)null, "Invoke", new object[2]{null,new object[2]{Pack[2],Helper.Decompress(Helper.SB(Pack[3]))}}, (string[])null, (Type[])null, (bool[])null, true)
Source: bUrP.exe, Messages.cs .Net Code: NewLateBinding.LateCall(obj, (Type)null, "Invoke", new object[2]{null,new object[1] { Pack[2] }}, (string[])null, (Type[])null, (bool[])null, true)
.NET source code contains potential unpacker
Source: bUrP.exe, Messages.cs .Net Code: Plugin System.AppDomain.Load(byte[])
Source: bUrP.exe, Messages.cs .Net Code: Memory System.AppDomain.Load(byte[])
Source: bUrP.exe, Messages.cs .Net Code: Memory
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Allocates memory with a write watch (potentially for evading sandboxes)
Source: C:\Users\user\Desktop\bUrP.exe Memory allocated: CB0000 memory reserve | memory write watch Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Memory allocated: 1A8E0000 memory reserve | memory write watch Jump to behavior
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Source: C:\Users\user\Desktop\bUrP.exe Window / User API: threadDelayed 9727 Jump to behavior
May sleep (evasive loops) to hinder dynamic analysis
Source: C:\Users\user\Desktop\bUrP.exe TID: 7640 Thread sleep count: 234 > 30 Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe TID: 7640 Thread sleep time: -234000s >= -30000s Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe TID: 7640 Thread sleep count: 9727 > 30 Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe TID: 7640 Thread sleep time: -9727000s >= -30000s Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe File Volume queried: C:\ FullSizeInformation Jump to behavior
Source: bUrP.exe, 00000000.00000002.4066689460.0000000000B16000.00000004.00000020.00020000.00000000.sdmp Binary or memory string: Hyper-V RAW%SystemRoot%\system32\mswsock.dllz
Enables debug privileges
Source: C:\Users\user\Desktop\bUrP.exe Process token adjusted: Debug Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Memory allocated: page read and write | page guard Jump to behavior
Queries the volume information (name, serial number etc) of a device
Source: C:\Users\user\Desktop\bUrP.exe Queries volume information: C:\Users\user\Desktop\bUrP.exe VolumeInformation Jump to behavior
Source: C:\Users\user\Desktop\bUrP.exe Key value queried: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography MachineGuid Jump to behavior

Stealing of Sensitive Information
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Yara detected XWorm
Source: Yara match File source: bUrP.exe, type: SAMPLE
Source: Yara match File source: 0.0.bUrP.exe.580000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 00000000.00000000.1618143277.0000000000582000.00000002.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: bUrP.exe PID: 7576, type: MEMORYSTR

Remote Access Functionality
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Yara detected XWorm
Source: Yara match File source: bUrP.exe, type: SAMPLE
Source: Yara match File source: 0.0.bUrP.exe.580000.0.unpack, type: UNPACKEDPE
Source: Yara match File source: 00000000.00000000.1618143277.0000000000582000.00000002.00000001.01000000.00000003.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: bUrP.exe PID: 7576, type: MEMORYSTR
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 dnsIp2 2 Behavior Graph ID: 1415997 Sample: bUrP.exe Startdate: 26/03/2024 Architecture: WINDOWS Score: 100 9 dzn.ddns.net 2->9 13 Found malware configuration 2->13 15 Malicious sample detected (through community Yara rule) 2->15 17 Antivirus detection for URL or domain 2->17 21 9 other signatures 2->21 6 bUrP.exe 2 2->6         started        signatures3 19 Uses dynamic DNS services 9->19 process4 dnsIp5 11 dzn.ddns.net 191.233.27.50, 49729, 49730, 49734 MICROSOFT-CORP-MSN-AS-BLOCKUS Brazil 6->11
  • No. of IPs < 25%
  • 25% < No. of IPs < 50%
  • 50% < No. of IPs < 75%
  • 75% < No. of IPs

Contacted Public IPs

IP Domain Country Flag ASN ASN Name Malicious
191.233.27.50
 dzn.ddns.net Brazil
8075 MICROSOFT-CORP-MSN-AS-BLOCKUS true

Contacted Domains

Name IP Active
dzn.ddns.net 191.233.27.50 true

Contacted URLs

Name Malicious Antivirus Detection Reputation
dzn.ddns.net true
  • Avira URL Cloud: malware
 unknown