Windows Analysis Report
EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe

Overview

General Information

Sample Name: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe
Analysis ID: 632597
MD5: f51029776cf59c102ed0e1c757484e8b
SHA1: 2331eaecdd1da03fc229c8639cddc03ccc34e18f
SHA256: aac13b3f25b043fcc1baaa1481ab241a4845ff0d978fe86a455deaf28cedd352
Tags: exeGuLoader
Infos:

Detection

GuLoader
Score: 80
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Found malware configuration
Multi AV Scanner detection for submitted file
Yara detected GuLoader
Initial sample is a PE file and has a suspicious name
Tries to detect virtualization through RDTSC time measurements
C2 URLs / IPs found in malware configuration
Uses an obfuscated file name to hide its real file extension (double extension)
Uses 32bit PE files
PE file does not import any functions
PE file contains strange resources
Drops PE files
Contains functionality to shutdown / reboot the system
Uses code obfuscation techniques (call, push, ret)
Binary contains a suspicious time stamp
Detected potential crypto function
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Contains functionality to dynamically determine API calls
Found dropped PE file which has not been started or loaded
Abnormal high CPU Usage
Contains functionality for read data from the clipboard

Classification

AV Detection
barindex
Found malware configuration
Source: 00000000.00000002.771015114.0000000002CF0000.00000040.00001000.00020000.00000000.sdmp Malware Configuration Extractor: GuLoader {"Payload URL": "http://graphicdes.com/bin_MpLvP21.bin"}
Multi AV Scanner detection for submitted file
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Virustotal: Detection: 25% Perma Link
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe ReversingLabs: Detection: 21%
Uses 32bit PE files
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Registry value created: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Bay Jump to behavior
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: NO_SEH, TERMINAL_SERVER_AWARE, DYNAMIC_BASE, NX_COMPAT
Source: Binary string: System.Net.Quic.ni.pdb source: System.Net.Quic.dll.0.dr
Source: Binary string: D:\a\_work\1\s\artifacts\obj\System.Net.Quic\net6.0-windows-Release\System.Net.Quic.pdbRSDS source: System.Net.Quic.dll.0.dr
Source: Binary string: D:\a\_work\1\s\artifacts\obj\System.Net.Quic\net6.0-windows-Release\System.Net.Quic.pdb source: System.Net.Quic.dll.0.dr
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_00406850 FindFirstFileW,FindClose, 0_2_00406850
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_0040290B FindFirstFileW, 0_2_0040290B
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_00405C26 GetTempPathW,DeleteFileW,lstrcatW,lstrcatW,lstrlenW,FindFirstFileW,FindNextFileW,FindClose, 0_2_00405C26

Networking
barindex
C2 URLs / IPs found in malware configuration
Source: Malware configuration extractor URLs: http://graphicdes.com/bin_MpLvP21.bin
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe String found in binary or memory: http://nsis.sf.net/NSIS_ErrorError
Source: System.Net.Quic.dll.0.dr String found in binary or memory: https://aka.ms/dotnetquic
Source: System.Net.Quic.dll.0.dr String found in binary or memory: https://github.com/dotnet/runtime
Contains functionality for read data from the clipboard
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_004056BB GetDlgItem,GetDlgItem,GetDlgItem,GetDlgItem,GetClientRect,GetSystemMetrics,SendMessageW,SendMessageW,SendMessageW,SendMessageW,SendMessageW,SendMessageW,ShowWindow,ShowWindow,GetDlgItem,SendMessageW,SendMessageW,SendMessageW,GetDlgItem,CreateThread,FindCloseChangeNotification,ShowWindow,ShowWindow,ShowWindow,ShowWindow,SendMessageW,CreatePopupMenu,AppendMenuW,GetWindowRect,TrackPopupMenu,SendMessageW,OpenClipboard,EmptyClipboard,GlobalAlloc,GlobalLock,SendMessageW,GlobalUnlock,SetClipboardData,CloseClipboard, 0_2_004056BB

System Summary
barindex
Initial sample is a PE file and has a suspicious name
Source: initial sample Static PE information: Filename: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe
Uses 32bit PE files
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
PE file does not import any functions
Source: System.Net.Quic.dll.0.dr Static PE information: No import functions for PE file found
PE file contains strange resources
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
Contains functionality to shutdown / reboot the system
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_0040350A EntryPoint,SetErrorMode,GetVersionExW,GetVersionExW,GetVersionExW,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,OleUninitialize,ExitProcess,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_0040350A
Detected potential crypto function
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_732A1BFF 0_2_732A1BFF
Abnormal high CPU Usage
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Process Stats: CPU usage > 98%
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Virustotal: Detection: 25%
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe ReversingLabs: Detection: 21%
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File read: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Jump to behavior
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Key value queried: HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f486a52-3cb1-48fd-8f50-b8dc300d9f9d}\InProcServer32 Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_0040350A EntryPoint,SetErrorMode,GetVersionExW,GetVersionExW,GetVersionExW,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,OleUninitialize,ExitProcess,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_0040350A
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File created: C:\Users\user\AppData\Local\Temp\nsd5E2B.tmp Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File written: C:\Users\user\AppData\Local\Temp\Undergaaedes.ini Jump to behavior
Source: classification engine Classification label: mal80.troj.evad.winEXE@1/8@0/0
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_004021AA CoCreateInstance, 0_2_004021AA
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File read: C:\Users\desktop.ini Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_00404967 GetDlgItem,SetWindowTextW,SHBrowseForFolderW,CoTaskMemFree,lstrcmpiW,lstrcatW,SetDlgItemTextW,GetDiskFreeSpaceW,MulDiv,SetDlgItemTextW, 0_2_00404967
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Registry value created: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\Bay Jump to behavior
Source: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Static PE information: NO_SEH, TERMINAL_SERVER_AWARE, DYNAMIC_BASE, NX_COMPAT
Source: Binary string: System.Net.Quic.ni.pdb source: System.Net.Quic.dll.0.dr
Source: Binary string: D:\a\_work\1\s\artifacts\obj\System.Net.Quic\net6.0-windows-Release\System.Net.Quic.pdbRSDS source: System.Net.Quic.dll.0.dr
Source: Binary string: D:\a\_work\1\s\artifacts\obj\System.Net.Quic\net6.0-windows-Release\System.Net.Quic.pdb source: System.Net.Quic.dll.0.dr

Data Obfuscation
barindex
Yara detected GuLoader
Source: Yara match File source: 00000000.00000002.771015114.0000000002CF0000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Uses code obfuscation techniques (call, push, ret)
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_732A30C0 push eax; ret 0_2_732A30EE
Binary contains a suspicious time stamp
Source: System.Net.Quic.dll.0.dr Static PE information: 0xF53C092F [Tue May 18 19:40:31 2100 UTC]
Contains functionality to dynamically determine API calls
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_732A1BFF GlobalAlloc,lstrcpyW,lstrcpyW,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,lstrcpyW,GetModuleHandleW,LoadLibraryW,GetProcAddress,lstrlenW, 0_2_732A1BFF
Drops PE files
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File created: C:\Users\user\AppData\Local\Temp\System.Net.Quic.dll Jump to dropped file
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe File created: C:\Users\user\AppData\Local\Temp\nso6177.tmp\System.dll Jump to dropped file

Hooking and other Techniques for Hiding and Protection
barindex
Uses an obfuscated file name to hide its real file extension (double extension)
Source: Possible double extension: pdf.scr Static PE information: EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Registry key monitored for changes: HKEY_CURRENT_USER_Classes Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Process information set: NOOPENFILEERRORBOX Jump to behavior

Malware Analysis System Evasion
barindex
Tries to detect virtualization through RDTSC time measurements
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe RDTSC instruction interceptor: First address: 0000000002CF0B2A second address: 0000000002CF0B2A instructions: 0x00000000 rdtsc 0x00000002 cmp ebx, ecx 0x00000004 jc 00007FE390E70568h 0x00000006 inc ebp 0x00000007 inc ebx 0x00000008 jmp 00007FE390E705CAh 0x0000000a push bx 0x0000000c mov bx, 1215h 0x00000010 pop bx 0x00000012 rdtsc
Found dropped PE file which has not been started or loaded
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Dropped PE file which has not been started: C:\Users\user\AppData\Local\Temp\System.Net.Quic.dll Jump to dropped file
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_00406850 FindFirstFileW,FindClose, 0_2_00406850
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_0040290B FindFirstFileW, 0_2_0040290B
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_00405C26 GetTempPathW,DeleteFileW,lstrcatW,lstrcatW,lstrlenW,FindFirstFileW,FindNextFileW,FindClose, 0_2_00405C26
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe API call chain: ExitProcess graph end node
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe API call chain: ExitProcess graph end node
Contains functionality to dynamically determine API calls
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_732A1BFF GlobalAlloc,lstrcpyW,lstrcpyW,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,lstrcpyW,GetModuleHandleW,LoadLibraryW,GetProcAddress,lstrlenW, 0_2_732A1BFF
Source: C:\Users\user\Desktop\EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe Code function: 0_2_0040350A EntryPoint,SetErrorMode,GetVersionExW,GetVersionExW,GetVersionExW,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,OleUninitialize,ExitProcess,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_0040350A
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  • Signature
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  • Is Windows Process
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  • Visual Basic
  • Delphi
  • Java
  • .Net C# or VB.NET
  • C, C++ or other language
  • Is malicious
  • Internet
behaviorgraph top1 signatures2 2 Behavior Graph ID: 632597 Sample: EUR_Cert_3883774784847_CMR8... Startdate: 23/05/2022 Architecture: WINDOWS Score: 80 13 Found malware configuration 2->13 15 Multi AV Scanner detection for submitted file 2->15 17 Yara detected GuLoader 2->17 19 3 other signatures 2->19 5 EUR_Cert_3883774784847_CMR8494849.pdf.scr.exe 9 29 2->5         started        process3 file4 9 C:\Users\user\AppData\Local\...\System.dll, PE32 5->9 dropped 11 C:\Users\user\AppData\...\System.Net.Quic.dll, PE32+ 5->11 dropped 21 Tries to detect virtualization through RDTSC time measurements 5->21 signatures5
⊘No contacted IP infos

Contacted URLs

Name Malicious Antivirus Detection Reputation
http://graphicdes.com/bin_MpLvP21.bin true
  • Avira URL Cloud: safe
 unknown