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Analysis Report documentos.exe

Overview

General Information

Sample Name:documentos.exe
Analysis ID:383467
MD5:71d102249808e46de207ba5d1e1441ee
SHA1:b0538afec6fe730a0e01b8fd81febf68e03d2f54
SHA256:1b1622ce9c633a2c53dac43aaea43712544b7385d457b05574d4754cf850293c
Infos:

Most interesting Screenshot:

Detection

GuLoader
Score:88
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Multi AV Scanner detection for submitted file
Potential malicious icon found
Yara detected GuLoader
Executable has a suspicious name (potential lure to open the executable)
Found potential dummy code loops (likely to delay analysis)
Initial sample is a PE file and has a suspicious name
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Yara detected VB6 Downloader Generic
Abnormal high CPU Usage
Detected potential crypto function
Found large amount of non-executed APIs
PE file contains strange resources
Program does not show much activity (idle)
Sample file is different than original file name gathered from version info
Uses 32bit PE files
Uses code obfuscation techniques (call, push, ret)

Classification

Startup

  • System is w10x64
  • documentos.exe (PID: 7124 cmdline: 'C:\Users\user\Desktop\documentos.exe' MD5: 71D102249808E46DE207BA5D1E1441EE)
  • cleanup

Malware Configuration

No configs have been found

Yara Overview

Memory Dumps

SourceRuleDescriptionAuthorStrings
Process Memory Space: documentos.exe PID: 7124JoeSecurity_VB6DownloaderGenericYara detected VB6 Downloader GenericJoe Security
    Process Memory Space: documentos.exe PID: 7124JoeSecurity_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: documentos.exeVirustotal: Detection: 31%Perma Link
      Source: documentos.exeReversingLabs: Detection: 10%
      Source: documentos.exeStatic PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED

      System Summary:

      barindex
      Potential malicious icon foundShow sources
      Source: initial sampleIcon embedded in PE file: bad icon match: 20047c7c70f0e004
      Executable has a suspicious name (potential lure to open the executable)Show sources
      Source: documentos.exeStatic file information: Suspicious name
      Initial sample is a PE file and has a suspicious nameShow sources
      Source: initial sampleStatic PE information: Filename: documentos.exe
      Source: C:\Users\user\Desktop\documentos.exeProcess Stats: CPU usage > 98%
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_004015640_2_00401564
      Source: documentos.exeStatic PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
      Source: documentos.exe, 00000000.00000002.1170338790.00000000020A0000.00000002.00000001.sdmpBinary or memory string: OriginalFilenameuser32j% vs documentos.exe
      Source: documentos.exe, 00000000.00000000.644285775.0000000000426000.00000002.00020000.sdmpBinary or memory string: OriginalFilenameOutpiped.exe vs documentos.exe
      Source: documentos.exeBinary or memory string: OriginalFilenameOutpiped.exe vs documentos.exe
      Source: documentos.exeStatic PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
      Source: classification engineClassification label: mal88.rans.troj.evad.winEXE@1/0@0/0
      Source: documentos.exeStatic PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
      Source: C:\Users\user\Desktop\documentos.exeSection loaded: C:\Windows\SysWOW64\msvbvm60.dllJump to behavior
      Source: C:\Users\user\Desktop\documentos.exeKey opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiersJump to behavior
      Source: documentos.exeVirustotal: Detection: 31%
      Source: documentos.exeReversingLabs: Detection: 10%

      Data Obfuscation:

      barindex
      Yara detected GuLoaderShow sources
      Source: Yara matchFile source: Process Memory Space: documentos.exe PID: 7124, type: MEMORY
      Yara detected VB6 Downloader GenericShow sources
      Source: Yara matchFile source: Process Memory Space: documentos.exe PID: 7124, type: MEMORY
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_00403E6C push ss; retf 0_2_00403E6D
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_00406E3F push FFFFFFF6h; iretd 0_2_00406E41
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_00406DA7 push FFFFFFF6h; iretd 0_2_00406DA9
      Source: C:\Users\user\Desktop\documentos.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: documentos.exe, 00000000.00000002.1170152810.0000000000500000.00000040.00000001.sdmpBinary or memory string: C:\PROGRAM FILES\QEMU-GA\QEMU-GA.EXE
      Tries to detect virtualization through RDTSC time measurementsShow sources
      Source: C:\Users\user\Desktop\documentos.exeRDTSC instruction interceptor: First address: 0000000000502BB1 second address: 0000000000502BB1 instructions: 0x00000000 rdtsc 0x00000002 popad 0x00000003 add eax, ecx 0x00000005 inc esi 0x00000006 cmp byte ptr [esi], 00000000h 0x00000009 jne 00007FB6847551BBh 0x0000000b cmp al, bl 0x0000000d cmp byte ptr [esi], FFFFFFA4h 0x00000010 jnc 00007FB684755207h 0x00000012 fnop 0x00000014 mov ebx, eax 0x00000016 test ax, ax 0x00000019 shl eax, 05h 0x0000001c add eax, ebx 0x0000001e movzx ecx, byte ptr [esi] 0x00000021 pushad 0x00000022 mov eax, 0000007Ah 0x00000027 rdtsc
      Source: C:\Users\user\Desktop\documentos.exeRDTSC instruction interceptor: First address: 0000000000502D46 second address: 0000000000502D83 instructions: 0x00000000 rdtsc 0x00000002 popad 0x00000003 add esi, 00001000h 0x00000009 test dl, bl 0x0000000b cmp esi, 0000F000h 0x00000011 je 00007FB684B851D4h 0x00000017 cmp edx, C6B28C40h 0x0000001d cmp esi, 7FFFF000h 0x00000023 je 00007FB684B851C2h 0x00000029 push 00000000h 0x0000002b push 0000001Ch 0x0000002d cmp al, bl 0x0000002f fnop 0x00000031 push edi 0x00000032 test ax, ax 0x00000035 push 00000000h 0x00000037 pushad 0x00000038 mov eax, 0000004Fh 0x0000003d rdtsc
      Source: C:\Users\user\Desktop\documentos.exeAPI coverage: 2.6 %
      Source: all processesThread injection, dropped files, key value created, disk infection and DNS query: no activity detected
      Source: documentos.exe, 00000000.00000002.1170152810.0000000000500000.00000040.00000001.sdmpBinary or memory string: C:\Program Files\Qemu-ga\qemu-ga.exe

      Anti Debugging:

      barindex
      Found potential dummy code loops (likely to delay analysis)Show sources
      Source: C:\Users\user\Desktop\documentos.exeProcess Stats: CPU usage > 90% for more than 60s
      Source: all processesThread injection, dropped files, key value created, disk infection and DNS query: no activity detected
      Source: documentos.exe, 00000000.00000002.1170281468.0000000000C80000.00000002.00000001.sdmpBinary or memory string: Program Manager
      Source: documentos.exe, 00000000.00000002.1170281468.0000000000C80000.00000002.00000001.sdmpBinary or memory string: Shell_TrayWnd
      Source: documentos.exe, 00000000.00000002.1170281468.0000000000C80000.00000002.00000001.sdmpBinary or memory string: Progman
      Source: documentos.exe, 00000000.00000002.1170281468.0000000000C80000.00000002.00000001.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 Injection1Virtualization/Sandbox Evasion11OS Credential DumpingSecurity Software Discovery31Remote 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 ScriptsProcess Injection1LSASS MemoryVirtualization/Sandbox Evasion11Remote 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 Information1Security Account ManagerProcess Discovery1SMB/Windows Admin SharesData from Network Shared DriveAutomated ExfiltrationSteganographyExploit SS7 to Track Device LocationObtain Device Cloud BackupsDelete Device Data
      Local AccountsAt (Windows)Logon Script (Mac)Logon Script (Mac)Binary PaddingNTDSSystem Information Discovery11Distributed Component Object ModelInput CaptureScheduled TransferProtocol ImpersonationSIM Card SwapCarrier Billing Fraud

      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.