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Analysis Report Vivecas4.exe

Overview

General Information

Sample Name:Vivecas4.exe
Analysis ID:288401
MD5:0650533b7199c3d2e9c90382f3e61adf
SHA1:a9180727bfcf407ec4b1dba2d3bd2b3d51404028
SHA256:855165ead03ccea49d05114e33763aa2ff73bdc26062868c1a1eb12f36f07c64
Tags:GuLoader

Most interesting Screenshot:

Detection

GuLoader
Score:72
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Multi AV Scanner detection for submitted file
Potential malicious icon found
Yara detected GuLoader
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Yara detected VB6 Downloader Generic
Abnormal high CPU Usage
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to read the PEB
Detected potential crypto function
Found inlined nop instructions (likely shell or obfuscated code)
PE file contains strange resources
Sample file is different than original file name gathered from version info
Uses code obfuscation techniques (call, push, ret)

Classification

Startup

  • System is w10x64
  • Vivecas4.exe (PID: 6264 cmdline: 'C:\Users\user\Desktop\Vivecas4.exe' MD5: 0650533B7199C3D2E9C90382F3E61ADF)
  • cleanup

Malware Configuration

No configs have been found

Yara Overview

Memory Dumps

SourceRuleDescriptionAuthorStrings
Process Memory Space: Vivecas4.exe PID: 6264JoeSecurity_VB6DownloaderGenericYara detected VB6 Downloader GenericJoe Security
    Process Memory Space: Vivecas4.exe PID: 6264JoeSecurity_GuLoaderYara detected GuLoaderJoe Security

      Sigma Overview

      No Sigma rule has matched

      Signature Overview

      Click to jump to signature section

      Show All Signature Results

      AV Detection:

      barindex
      Multi AV Scanner detection for submitted fileShow sources
      Source: Vivecas4.exeReversingLabs: Detection: 14%
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 4x nop then clc 0_2_00401330
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 4x nop then pop dword ptr [ecx+esi]0_2_00401330
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 4x nop then clc 0_2_0040138C
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 4x nop then pop dword ptr [ecx+esi]0_2_0040138C

      System Summary:

      barindex
      Potential malicious icon foundShow sources
      Source: initial sampleIcon embedded in PE file: bad icon match: 20047c7c70f0e004
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess Stats: CPU usage > 98%
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_004013300_2_00401330
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_0040138C0_2_0040138C
      Source: Vivecas4.exeStatic PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
      Source: Vivecas4.exe, 00000000.00000002.636257900.0000000002090000.00000002.00000001.sdmpBinary or memory string: OriginalFilenameuser32j% vs Vivecas4.exe
      Source: classification engineClassification label: mal72.rans.troj.evad.winEXE@1/0@0/0
      Source: Vivecas4.exeStatic PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
      Source: C:\Users\user\Desktop\Vivecas4.exeSection loaded: C:\Windows\SysWOW64\msvbvm60.dllJump to behavior
      Source: C:\Users\user\Desktop\Vivecas4.exeKey opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiersJump to behavior
      Source: Vivecas4.exeReversingLabs: Detection: 14%

      Data Obfuscation:

      barindex
      Yara detected GuLoaderShow sources
      Source: Yara matchFile source: Process Memory Space: Vivecas4.exe PID: 6264, type: MEMORY
      Yara detected VB6 Downloader GenericShow sources
      Source: Yara matchFile source: Process Memory Space: Vivecas4.exe PID: 6264, type: MEMORY
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_0040C204 push esp; retn 0040h0_2_0040C46D
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_0040C14D push A4006C00h; retn 0040h0_2_0040C19D
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_00408D00 push fs; iretd 0_2_00408D0F
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_00403D14 push eax; iretd 0_2_00403D20
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_0040A11C push esp; iretd 0_2_0040A11D
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_00409DD4 push ebp; iretd 0_2_00409DDB
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_00409DDD push ebp; iretd 0_2_00409DDF
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_004027F8 push 6858553Ah; iretd 0_2_004027FD
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_0040239E push edi; retf 0_2_0040239F
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess information set: NOOPENFILEERRORBOXJump to behavior
      Source: C:\Users\user\Desktop\Vivecas4.exeProcess information set: NOOPENFILEERRORBOXJump to behavior

      Malware Analysis System Evasion:

      barindex
      Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)Show sources
      Source: Vivecas4.exe, 00000000.00000002.636384564.00000000020E0000.00000040.00000001.sdmpBinary or memory string: C:\PROGRAM FILES\QEMU-GA\QEMU-GA.EXE8
      Source: Vivecas4.exeBinary or memory string: C:\PROGRAM FILES\QEMU-GA\QEMU-GA.EXE
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E72FE rdtsc 0_2_020E72FE
      Source: Vivecas4.exe, 00000000.00000002.636384564.00000000020E0000.00000040.00000001.sdmpBinary or memory string: C:\Program Files\Qemu-ga\qemu-ga.exe8
      Source: Vivecas4.exeBinary or memory string: C:\Program Files\Qemu-ga\qemu-ga.exe
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E72FE rdtsc 0_2_020E72FE
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E7C28 mov eax, dword ptr fs:[00000030h]0_2_020E7C28
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E6874 mov eax, dword ptr fs:[00000030h]0_2_020E6874
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E1EA4 mov eax, dword ptr fs:[00000030h]0_2_020E1EA4
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E391E mov eax, dword ptr fs:[00000030h]0_2_020E391E
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E6F4C mov eax, dword ptr fs:[00000030h]0_2_020E6F4C
      Source: C:\Users\user\Desktop\Vivecas4.exeCode function: 0_2_020E2968 mov eax, dword ptr fs:[00000030h]0_2_020E2968
      Source: Vivecas4.exe, 00000000.00000002.635848512.0000000000C20000.00000002.00000001.sdmpBinary or memory string: Shell_TrayWnd
      Source: Vivecas4.exe, 00000000.00000002.635848512.0000000000C20000.00000002.00000001.sdmpBinary or memory string: NProgram Manager
      Source: Vivecas4.exe, 00000000.00000002.635848512.0000000000C20000.00000002.00000001.sdmpBinary or memory string: Progman
      Source: Vivecas4.exe, 00000000.00000002.635848512.0000000000C20000.00000002.00000001.sdmpBinary or memory string: Progmanlock

      Mitre Att&ck Matrix

      Initial AccessExecutionPersistencePrivilege EscalationDefense EvasionCredential AccessDiscoveryLateral MovementCollectionExfiltrationCommand and ControlNetwork EffectsRemote Service EffectsImpact
      Valid AccountsWindows Management InstrumentationPath InterceptionProcess Injection1Process Injection1OS Credential DumpingSecurity Software Discovery111Remote ServicesArchive Collected Data1Exfiltration Over Other Network MediumEncrypted Channel1Eavesdrop on Insecure Network CommunicationRemotely Track Device Without AuthorizationModify System Partition
      Default AccountsScheduled Task/JobBoot or Logon Initialization ScriptsBoot or Logon Initialization ScriptsObfuscated Files or Information2LSASS MemoryProcess Discovery1Remote Desktop ProtocolData from Removable MediaExfiltration Over BluetoothJunk DataExploit SS7 to Redirect Phone Calls/SMSRemotely Wipe Data Without AuthorizationDevice Lockout
      Domain AccountsAt (Linux)Logon Script (Windows)Logon Script (Windows)Obfuscated Files or InformationSecurity Account ManagerSystem Information Discovery1SMB/Windows Admin SharesData from Network Shared DriveAutomated ExfiltrationSteganographyExploit SS7 to Track Device LocationObtain Device Cloud BackupsDelete Device Data

      Behavior Graph

      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

      Screenshots

      Thumbnails

      This section contains all screenshots as thumbnails, including those not shown in the slideshow.