Windows Analysis Report
Rechung-R1663322504.exe

Overview

General Information

Sample Name: Rechung-R1663322504.exe
Analysis ID: 829392
MD5: 11b5b208de7a85b46104a0597c5da7dc
SHA1: c578bc317e666159cbfc191cb4e50de2de03ab79
SHA256: 0a80ba418f561098477e18cc42ddfc31796b2be3166ff6c99967b98388fe4826
Tags: DEUexegeosignedSnakeKeylogger
Infos:

Detection

GuLoader
Score: 60
Range: 0 - 100
Whitelisted: false
Confidence: 100%

Signatures

Multi AV Scanner detection for submitted file
Yara detected GuLoader
Tries to detect virtualization through RDTSC time measurements
Uses 32bit PE files
Drops PE files
Contains functionality to shutdown / reboot the system
Uses code obfuscation techniques (call, push, ret)
Creates files inside the system directory
Detected potential crypto function
PE / OLE file has an invalid certificate
Contains functionality to dynamically determine API calls
Abnormal high CPU Usage
Contains functionality for read data from the clipboard

Classification

AV Detection
barindex
Multi AV Scanner detection for submitted file
Source: Rechung-R1663322504.exe ReversingLabs: Detection: 30%
Source: Rechung-R1663322504.exe Virustotal: Detection: 37% Perma Link
Uses 32bit PE files
Source: Rechung-R1663322504.exe Static PE information: RELOCS_STRIPPED, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, LOCAL_SYMS_STRIPPED, 32BIT_MACHINE
Source: Rechung-R1663322504.exe Static PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00402862 FindFirstFileW, 0_2_00402862
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_0040596D GetTempPathW,DeleteFileW,lstrcatW,lstrcatW,lstrlenW,FindFirstFileW,FindNextFileW,FindClose, 0_2_0040596D
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_004065A2 FindFirstFileW,FindClose, 0_2_004065A2
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft\Windows\Printer Shortcuts Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft\Windows Jump to behavior
Source: Rechung-R1663322504.exe String found in binary or memory: http://crl.certum.pl/ctnca.crl0k
Source: Rechung-R1663322504.exe String found in binary or memory: http://crl.certum.pl/ctnca2.crl0l
Source: Rechung-R1663322504.exe String found in binary or memory: http://crl.certum.pl/ctsca2021.crl0o
Source: Rechung-R1663322504.exe String found in binary or memory: http://nsis.sf.net/NSIS_ErrorError
Source: Rechung-R1663322504.exe String found in binary or memory: http://repository.certum.pl/ctnca.cer09
Source: Rechung-R1663322504.exe String found in binary or memory: http://repository.certum.pl/ctnca2.cer09
Source: Rechung-R1663322504.exe String found in binary or memory: http://repository.certum.pl/ctsca2021.cer0
Source: Rechung-R1663322504.exe String found in binary or memory: http://subca.ocsp-certum.com01
Source: Rechung-R1663322504.exe String found in binary or memory: http://subca.ocsp-certum.com02
Source: Rechung-R1663322504.exe String found in binary or memory: http://subca.ocsp-certum.com05
Source: Rechung-R1663322504.exe String found in binary or memory: http://www.certum.pl/CPS0
Contains functionality for read data from the clipboard
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00405402 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_00405402
Uses 32bit PE files
Source: Rechung-R1663322504.exe Static PE information: RELOCS_STRIPPED, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, LOCAL_SYMS_STRIPPED, 32BIT_MACHINE
Contains functionality to shutdown / reboot the system
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00403350 EntryPoint,SetErrorMode,GetVersion,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,GetModuleHandleW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,OleUninitialize,ExitProcess,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_00403350
Creates files inside the system directory
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File created: C:\Windows\SysWOW64\Arbejdsglderne Jump to behavior
Detected potential crypto function
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00404C3F 0_2_00404C3F
PE / OLE file has an invalid certificate
Source: Rechung-R1663322504.exe Static PE information: invalid certificate
Abnormal high CPU Usage
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Process Stats: CPU usage > 98%
Source: Rechung-R1663322504.exe ReversingLabs: Detection: 30%
Source: Rechung-R1663322504.exe Virustotal: Detection: 37%
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File read: C:\Users\user\Desktop\Rechung-R1663322504.exe Jump to behavior
Source: Rechung-R1663322504.exe Static PE information: Section: .text IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.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\Rechung-R1663322504.exe Code function: 0_2_00403350 EntryPoint,SetErrorMode,GetVersion,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,GetModuleHandleW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,OleUninitialize,ExitProcess,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_00403350
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File created: C:\Users\user\Socialdirektrer Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File created: C:\Users\user\AppData\Local\Temp\nsv3DAD.tmp Jump to behavior
Source: classification engine Classification label: mal60.troj.evad.winEXE@1/8@0/0
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_004020FE CoCreateInstance, 0_2_004020FE
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File read: C:\Users\desktop.ini Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_004046C3 GetDlgItem,SetWindowTextW,SHBrowseForFolderW,CoTaskMemFree,lstrcmpiW,lstrcatW,SetDlgItemTextW,GetDiskFreeSpaceW,MulDiv,SetDlgItemTextW, 0_2_004046C3
Source: Rechung-R1663322504.exe Static PE information: DYNAMIC_BASE, NX_COMPAT, NO_SEH, TERMINAL_SERVER_AWARE

Data Obfuscation
barindex
Yara detected GuLoader
Source: Yara match File source: 00000000.00000002.774741365.00000000064AB000.00000040.00001000.00020000.00000000.sdmp, type: MEMORY
Uses code obfuscation techniques (call, push, ret)
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_10002DE0 push eax; ret 0_2_10002E0E
Contains functionality to dynamically determine API calls
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_10001B18 GlobalAlloc,lstrcpyW,lstrcpyW,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,lstrcpyW,GetModuleHandleW,LoadLibraryW,GetProcAddress,lstrlenW, 0_2_10001B18
Drops PE files
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File created: C:\Users\user\AppData\Local\Temp\nsw3E4B.tmp\System.dll Jump to dropped file
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File created: C:\Users\user\AppData\Local\Temp\nsw3E4B.tmp\AdvSplash.dll Jump to dropped file
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Process information set: NOOPENFILEERRORBOX Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.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\Rechung-R1663322504.exe RDTSC instruction interceptor: First address: 00000000066FD201 second address: 00000000066FD201 instructions: 0x00000000 rdtsc 0x00000002 cmp ebx, ecx 0x00000004 jc 00007FB1345B668Ah 0x00000006 inc ebp 0x00000007 inc ebx 0x00000008 rdtsc
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00402862 FindFirstFileW, 0_2_00402862
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_0040596D GetTempPathW,DeleteFileW,lstrcatW,lstrcatW,lstrlenW,FindFirstFileW,FindNextFileW,FindClose, 0_2_0040596D
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_004065A2 FindFirstFileW,FindClose, 0_2_004065A2
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe API call chain: ExitProcess graph end node
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe API call chain: ExitProcess graph end node
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft\Windows\Printer Shortcuts Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming Jump to behavior
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe File opened: C:\Users\user\AppData\Roaming\Microsoft\Windows Jump to behavior
Contains functionality to dynamically determine API calls
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_10001B18 GlobalAlloc,lstrcpyW,lstrcpyW,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,GlobalFree,lstrcpyW,GetModuleHandleW,LoadLibraryW,GetProcAddress,lstrlenW, 0_2_10001B18
Source: C:\Users\user\Desktop\Rechung-R1663322504.exe Code function: 0_2_00403350 EntryPoint,SetErrorMode,GetVersion,lstrlenA,#17,OleInitialize,SHGetFileInfoW,GetCommandLineW,GetModuleHandleW,CharNextW,GetTempPathW,GetTempPathW,GetWindowsDirectoryW,lstrcatW,GetTempPathW,lstrcatW,SetEnvironmentVariableW,SetEnvironmentVariableW,SetEnvironmentVariableW,DeleteFileW,OleUninitialize,ExitProcess,lstrcatW,lstrcatW,lstrcatW,lstrcmpiW,SetCurrentDirectoryW,DeleteFileW,CopyFileW,CloseHandle,GetCurrentProcess,OpenProcessToken,LookupPrivilegeValueW,AdjustTokenPrivileges,ExitWindowsEx,ExitProcess, 0_2_00403350
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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 signatures2 2 Behavior Graph ID: 829392 Sample: Rechung-R1663322504.exe Startdate: 18/03/2023 Architecture: WINDOWS Score: 60 13 Multi AV Scanner detection for submitted file 2->13 15 Yara detected GuLoader 2->15 5 Rechung-R1663322504.exe 2 35 2->5         started        process3 file4 9 C:\Users\user\AppData\Local\...\System.dll, PE32 5->9 dropped 11 C:\Users\user\AppData\Local\...\AdvSplash.dll, PE32 5->11 dropped 17 Tries to detect virtualization through RDTSC time measurements 5->17 signatures5
⊘No contacted IP infos