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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_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.dll
      Source: C:\Users\user\Desktop\documentos.exeKey opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers
      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
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_00406E3F push FFFFFFF6h; iretd
      Source: C:\Users\user\Desktop\documentos.exeCode function: 0_2_00406DA7 push FFFFFFF6h; iretd
      Source: C:\Users\user\Desktop\documentos.exeProcess information set: NOOPENFILEERRORBOX

      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.

      windows-stand

      Antivirus, Machine Learning and Genetic Malware Detection

      Initial Sample

      SourceDetectionScannerLabelLink
      documentos.exe32%VirustotalBrowse
      documentos.exe10%ReversingLabsWin32.Backdoor.Remcos

      Dropped Files

      No Antivirus matches

      Unpacked PE Files

      No Antivirus matches

      Domains

      No Antivirus matches

      URLs

      No Antivirus matches

      Domains and IPs

      Contacted Domains

      No contacted domains info

      Contacted IPs

      No contacted IP infos

      General Information

      Joe Sandbox Version:31.0.0 Emerald
      Analysis ID:383467
      Start date:07.04.2021
      Start time:20:37:41
      Joe Sandbox Product:CloudBasic
      Overall analysis duration:0h 8m 33s
      Hypervisor based Inspection enabled:false
      Report type:light
      Sample file name:documentos.exe
      Cookbook file name:default.jbs
      Analysis system description:Windows 10 64 bit v1803 with Office Professional Plus 2016, Chrome 85, IE 11, Adobe Reader DC 19, Java 8 Update 211
      Number of analysed new started processes analysed:15
      Number of new started drivers analysed:0
      Number of existing processes analysed:0
      Number of existing drivers analysed:0
      Number of injected processes analysed:0
      Technologies:
      • HCA enabled
      • EGA enabled
      • HDC enabled
      • AMSI enabled
      Analysis Mode:default
      Analysis stop reason:Timeout
      Detection:MAL
      Classification:mal88.rans.troj.evad.winEXE@1/0@0/0
      EGA Information:
      • Successful, ratio: 100%
      HDC Information:
      • Successful, ratio: 11.1% (good quality ratio 9.8%)
      • Quality average: 52.1%
      • Quality standard deviation: 22.9%
      HCA Information:Failed
      Cookbook Comments:
      • Adjust boot time
      • Enable AMSI
      • Found application associated with file extension: .exe
      • Override analysis time to 240s for sample files taking high CPU consumption
      Warnings:
      Show All
      • Behavior information exceeds normal sizes, reducing to normal. Report will have missing behavior information.
      • Exclude process from analysis (whitelisted): BackgroundTransferHost.exe, backgroundTaskHost.exe, svchost.exe, wuapihost.exe

      Simulations

      Behavior and APIs

      No simulations

      Joe Sandbox View / Context

      IPs

      No context

      Domains

      No context

      ASN

      No context

      JA3 Fingerprints

      No context

      Dropped Files

      No context

      Created / dropped Files

      No created / dropped files found

      Static File Info

      General

      File type:PE32 executable (GUI) Intel 80386, for MS Windows
      Entropy (8bit):5.800179475931607
      TrID:
      • Win32 Executable (generic) a (10002005/4) 99.15%
      • Win32 Executable Microsoft Visual Basic 6 (82127/2) 0.81%
      • Generic Win/DOS Executable (2004/3) 0.02%
      • DOS Executable Generic (2002/1) 0.02%
      • Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
      File name:documentos.exe
      File size:155648
      MD5:71d102249808e46de207ba5d1e1441ee
      SHA1:b0538afec6fe730a0e01b8fd81febf68e03d2f54
      SHA256:1b1622ce9c633a2c53dac43aaea43712544b7385d457b05574d4754cf850293c
      SHA512:27a3229760a9d5a2f8324ea094daa9be596ce8fb576c2f592c2d67df7c8843268fe2edbd571bea5fda30dcfacbdfb4ef0d808cc213c75d31f03a25710180b386
      SSDEEP:1536:/siCE7hAX1SvRtIo02gPS2QY4qNw+6dbg3Oad/HfGRXuNbNnvwD7IoG5QzI6mUQp:UpE7yXetag2xhZzd/HfiYZnvmzLRQpz
      File Content Preview:MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$........#...B...B...B..L^...B...`...B...d...B..Rich.B..........PE..L....hm`.................0...0......d........@....@................

      File Icon

      Icon Hash:20047c7c70f0e004

      Static PE Info

      General

      Entrypoint:0x401564
      Entrypoint Section:.text
      Digitally signed:false
      Imagebase:0x400000
      Subsystem:windows gui
      Image File Characteristics:LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
      DLL Characteristics:
      Time Stamp:0x606D688C [Wed Apr 7 08:08:44 2021 UTC]
      TLS Callbacks:
      CLR (.Net) Version:
      OS Version Major:4
      OS Version Minor:0
      File Version Major:4
      File Version Minor:0
      Subsystem Version Major:4
      Subsystem Version Minor:0
      Import Hash:545536ea1fbc91386e1294093d2f717e

      Entrypoint Preview

      Instruction
      push 00401740h
      call 00007FB684A89825h
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      xor byte ptr [eax], al
      add byte ptr [eax], al
      inc eax
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add bh, dh
      popad
      pushfd
      jns 00007FB684A8986Bh
      fistp word ptr [eax+4Dh]
      movsb
      or eax, dword ptr [eax+3Ch]
      pushad
      fbstp [esi+000000BCh]
      add byte ptr [eax], al
      add byte ptr [ecx], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax+64h], ah
      adc dword ptr [ebx], eax
      jnc 00007FB684A898A6h
      jc 00007FB684A89893h
      outsb
      jnc 00007FB684A8989Eh
      popad
      add byte ptr fs:[eax], ah
      or byte ptr [ecx+00h], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      dec esp
      xor dword ptr [eax], eax
      add eax, 59164BAAh
      mov bh, byte ptr [edx+edx*2-4AC754B9h]
      mov word ptr [ebp+35h], cs
      push ds
      rcr dword ptr [eax-17h], 7Dh
      and bh, byte ptr [ebx-7DB36973h]
      jne 00007FB684A8984Fh
      fadd dword ptr [eax+3A978C9Fh]
      dec edi
      lodsd
      xor ebx, dword ptr [ecx-48EE309Ah]
      or al, 00h
      stosb
      add byte ptr [eax-2Dh], ah
      xchg eax, ebx
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      add byte ptr [eax], al
      sub eax, dword ptr [ecx]
      add byte ptr [eax], al
      push eax
      add byte ptr [eax], al
      add byte ptr [eax], al
      push cs
      add byte ptr [ebx+6Fh], cl
      outsb
      jbe 00007FB684A89897h
      outsb
      je 00007FB684A8989Bh
      outsd
      outsb
      insb
      insb
      add byte ptr [53000A01h], cl

      Data Directories

      NameVirtual AddressVirtual Size Is in Section
      IMAGE_DIRECTORY_ENTRY_EXPORT0x00x0
      IMAGE_DIRECTORY_ENTRY_IMPORT0x238340x28.text
      IMAGE_DIRECTORY_ENTRY_RESOURCE0x260000x9d8.rsrc
      IMAGE_DIRECTORY_ENTRY_EXCEPTION0x00x0
      IMAGE_DIRECTORY_ENTRY_SECURITY0x00x0
      IMAGE_DIRECTORY_ENTRY_BASERELOC0x00x0
      IMAGE_DIRECTORY_ENTRY_DEBUG0x00x0
      IMAGE_DIRECTORY_ENTRY_COPYRIGHT0x00x0
      IMAGE_DIRECTORY_ENTRY_GLOBALPTR0x00x0
      IMAGE_DIRECTORY_ENTRY_TLS0x00x0
      IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG0x00x0
      IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT0x2280x20
      IMAGE_DIRECTORY_ENTRY_IAT0x10000x17c.text
      IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT0x00x0
      IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR0x00x0
      IMAGE_DIRECTORY_ENTRY_RESERVED0x00x0

      Sections

      NameVirtual AddressVirtual SizeRaw SizeXored PEZLIB ComplexityFile TypeEntropyCharacteristics
      .text0x10000x22e040x23000False0.348597935268data6.03854398613IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
      .data0x240000x11940x1000False0.00634765625data0.0IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_MEM_READ
      .rsrc0x260000x9d80x1000False0.179443359375data2.13350863125IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ

      Resources

      NameRVASizeTypeLanguageCountry
      RT_ICON0x268a80x130data
      RT_ICON0x265c00x2e8data
      RT_ICON0x264980x128GLS_BINARY_LSB_FIRST
      RT_GROUP_ICON0x264680x30data
      RT_VERSION0x261500x318dataChineseTaiwan

      Imports

      DLLImport
      MSVBVM60.DLL_CIcos, _adj_fptan, __vbaVarMove, __vbaFreeVar, __vbaStrVarMove, __vbaFreeVarList, _adj_fdiv_m64, __vbaFreeObjList, _adj_fprem1, __vbaHresultCheckObj, _adj_fdiv_m32, __vbaAryDestruct, __vbaObjSet, __vbaOnError, _adj_fdiv_m16i, __vbaObjSetAddref, _adj_fdivr_m16i, __vbaFpR8, __vbaVarTstLt, _CIsin, __vbaChkstk, EVENT_SINK_AddRef, __vbaGenerateBoundsError, __vbaStrCmp, __vbaAryConstruct2, __vbaI2I4, __vbaObjVar, _adj_fpatan, __vbaLateIdCallLd, __vbaRedim, EVENT_SINK_Release, __vbaUI1I2, _CIsqrt, EVENT_SINK_QueryInterface, __vbaExceptHandler, _adj_fprem, _adj_fdivr_m64, __vbaI2Str, __vbaVarErrI4, __vbaFPException, __vbaInStrVar, __vbaStrVarVal, _CIlog, __vbaErrorOverflow, __vbaNew2, _adj_fdiv_m32i, _adj_fdivr_m32i, __vbaStrCopy, __vbaFreeStrList, __vbaDerefAry1, _adj_fdivr_m32, _adj_fdiv_r, __vbaI4Var, __vbaVarAdd, __vbaLateMemCall, __vbaVarDup, __vbaFpI4, _CIatan, __vbaUI1Str, __vbaStrMove, _allmul, _CItan, _CIexp, __vbaFreeObj, __vbaFreeStr

      Version Infos

      DescriptionData
      Translation0x0404 0x04b0
      LegalCopyrightCollutions
      InternalNameOutpiped
      FileVersion1.00
      CompanyNameCollutions
      LegalTrademarksCollutions
      CommentsCollutions
      ProductNameCollutions
      ProductVersion1.00
      FileDescriptionCreepy Collutions
      OriginalFilenameOutpiped.exe

      Possible Origin

      Language of compilation systemCountry where language is spokenMap
      ChineseTaiwan

      Network Behavior

      No network behavior found

      Code Manipulations

      Statistics

      System Behavior

      General

      Start time:20:38:26
      Start date:07/04/2021
      Path:C:\Users\user\Desktop\documentos.exe
      Wow64 process (32bit):true
      Commandline:'C:\Users\user\Desktop\documentos.exe'
      Imagebase:0x400000
      File size:155648 bytes
      MD5 hash:71D102249808E46DE207BA5D1E1441EE
      Has elevated privileges:true
      Has administrator privileges:true
      Programmed in:Visual Basic
      Reputation:low

      Disassembly

      Code Analysis

      Reset < >