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Windows Analysis Report Paidcheck.pdf.exe

Overview

General Information

Sample Name:Paidcheck.pdf.exe
Analysis ID:452385
MD5:ce32e8605adb6c9bb2dcee69fe887b46
SHA1:2ace1fb1e3523768003b61a4a79193214ffafed9
SHA256:7e22f7f21e8798805234be7ac26bad65c1edecb55b051343e0933a68041ce073
Tags:exeNanoCoreRAT
Infos:

Most interesting Screenshot:

Detection

Nanocore
Score:100
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Detected Nanocore Rat
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Sigma detected: NanoCore
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Yara detected Nanocore RAT
.NET source code contains potential unpacker
C2 URLs / IPs found in malware configuration
Creates an undocumented autostart registry key
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Sigma detected: Suspicious Process Start Without DLL
Sigma detected: Suspicious Script Execution From Temp Folder
Sigma detected: WScript or CScript Dropper
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses an obfuscated file name to hide its real file extension (double extension)
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Antivirus or Machine Learning detection for unpacked file
Binary contains a suspicious time stamp
Checks if Antivirus/Antispyware/Firewall program is installed (via WMI)
Contains long sleeps (>= 3 min)
Creates a DirectInput object (often for capturing keystrokes)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Drops PE files
Enables debug privileges
Found WSH timer for Javascript or VBS script (likely evasive script)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
Installs a raw input device (often for capturing keystrokes)
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Stores files to the Windows start menu directory
Tries to load missing DLLs
Uses 32bit PE files
Uses code obfuscation techniques (call, push, ret)
Yara signature match

Classification

Process Tree

  • System is w10x64
  • Paidcheck.pdf.exe (PID: 4608 cmdline: 'C:\Users\user\Desktop\Paidcheck.pdf.exe' MD5: CE32E8605ADB6C9BB2DCEE69FE887B46)
    • wscript.exe (PID: 1968 cmdline: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' MD5: 7075DD7B9BE8807FCA93ACD86F724884)
      • powershell.exe (PID: 748 cmdline: 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe' Set-MpPreference -ExclusionPath C:\,'C:\Users\user\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\dwrn\explorerr.exe' MD5: DBA3E6449E97D4E3DF64527EF7012A10)
        • conhost.exe (PID: 6096 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
    • RegAsm.exe (PID: 2308 cmdline: C:\Users\user\AppData\Local\Temp\RegAsm.exe MD5: 6FD7592411112729BF6B1F2F6C34899F)
      • schtasks.exe (PID: 5636 cmdline: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp4FE3.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
        • conhost.exe (PID: 5784 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • schtasks.exe (PID: 5848 cmdline: 'schtasks.exe' /create /f /tn 'DHCP Monitor Task' /xml 'C:\Users\user\AppData\Local\Temp\tmp5C0A.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
        • conhost.exe (PID: 2292 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • RegAsm.exe (PID: 5432 cmdline: C:\Users\user\AppData\Local\Temp\RegAsm.exe 0 MD5: 6FD7592411112729BF6B1F2F6C34899F)
    • conhost.exe (PID: 2992 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • dhcpmon.exe (PID: 496 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' 0 MD5: 6FD7592411112729BF6B1F2F6C34899F)
    • conhost.exe (PID: 484 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • dhcpmon.exe (PID: 4300 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' MD5: 6FD7592411112729BF6B1F2F6C34899F)
    • conhost.exe (PID: 1036 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • cleanup

Malware Configuration

Threatname: NanoCore

{"Version": "1.2.2.0", "Mutex": "bcd083ef-bf90-4541-bf76-579f377e", "Group": "5g", "Domain1": "217.138.212.57", "Domain2": "annapro.linkpc.net", "Port": 2018, "KeyboardLogging": "Enable", "RunOnStartup": "Enable", "RequestElevation": "Disable", "BypassUAC": "Enable", "ClearZoneIdentifier": "Disable", "ClearAccessControl": "Disable", "SetCriticalProcess": "Disable", "PreventSystemSleep": "Disable", "ActivateAwayMode": "Disable", "EnableDebugMode": "Disable", "RunDelay": 0, "ConnectDelay": 4000, "RestartDelay": 5000, "TimeoutInterval": 5000, "KeepAliveTimeout": 30000, "MutexTimeout": 5000, "LanTimeout": 2500, "WanTimeout": 8000, "BufferSize": "ffff0000", "MaxPacketSize": "0000a000", "GCThreshold": "0000a000", "UseCustomDNS": "Enable", "PrimaryDNSServer": "8.8.8.8", "BackupDNSServer": "8.8.4.4", "BypassUserAccountControlData": "<?xml version=\"1.0\" encoding=\"UTF-16\"?>\r\n<Task version=\"1.2\" xmlns=\"http://schemas.microsoft.com/windows/2004/02/mit/task\">\r\n  <RegistrationInfo />\r\n  <Triggers />\r\n  <Principals>\r\n    <Principal id=\"Author\">\r\n      <LogonType>InteractiveToken</LogonType>\r\n      <RunLevel>HighestAvailable</RunLevel>\r\n    </Principal>\r\n  </Principals>\r\n  <Settings>\r\n    <MultipleInstancesPolicy>Parallel</MultipleInstancesPolicy>\r\n    <DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>\r\n    <StopIfGoingOnBatteries>false</StopIfGoingOnBatteries>\r\n    <AllowHardTerminate>true</AllowHardTerminate>\r\n    <StartWhenAvailable>false</StartWhenAvailable>\r\n    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>\r\n    <IdleSettings>\r\n      <StopOnIdleEnd>false</StopOnIdleEnd>\r\n      <RestartOnIdle>false</RestartOnIdle>\r\n    </IdleSettings>\r\n    <AllowStartOnDemand>true</AllowStartOnDemand>\r\n    <Enabled>true</Enabled>\r\n    <Hidden>false</Hidden>\r\n    <RunOnlyIfIdle>false</RunOnlyIfIdle>\r\n    <WakeToRun>false</WakeToRun>\r\n    <ExecutionTimeLimit>PT0S</ExecutionTimeLimit>\r\n    <Priority>4</Priority>\r\n  </Settings>\r\n  <Actions Context=\"Author\">\r\n    <Exec>\r\n      <Command>\"#EXECUTABLEPATH\"</Command>\r\n      <Arguments>$(Arg0)</Arguments>\r\n    </Exec>\r\n  </Actions>\r\n</Task"}

Yara Overview

Memory Dumps

SourceRuleDescriptionAuthorStrings
0000000A.00000002.486028172.0000000003C21000.00000004.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
    0000000A.00000002.489583324.0000000006AE0000.00000004.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
    • 0x59eb:$x1: NanoCore.ClientPluginHost
    • 0x5b48:$x2: IClientNetworkHost
    0000000A.00000002.489583324.0000000006AE0000.00000004.00000001.sdmpNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
    • 0x59eb:$x2: NanoCore.ClientPluginHost
    • 0x6941:$s3: PipeExists
    • 0x5be1:$s4: PipeCreated
    • 0x5a05:$s5: IClientLoggingHost
    0000000A.00000002.480862241.0000000002BD1000.00000004.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
      0000000A.00000002.489612567.0000000006AF0000.00000004.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x39eb:$x1: NanoCore.ClientPluginHost
      • 0x3a24:$x2: IClientNetworkHost
      Click to see the 44 entries

      Unpacked PEs

      SourceRuleDescriptionAuthorStrings
      10.2.RegAsm.exe.6aa0000.26.raw.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x16e3:$x1: NanoCore.ClientPluginHost
      • 0x171c:$x2: IClientNetworkHost
      10.2.RegAsm.exe.6aa0000.26.raw.unpackNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
      • 0x16e3:$x2: NanoCore.ClientPluginHost
      • 0x1800:$s4: PipeCreated
      • 0x16fd:$s5: IClientLoggingHost
      10.2.RegAsm.exe.6af0000.31.raw.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x39eb:$x1: NanoCore.ClientPluginHost
      • 0x3a24:$x2: IClientNetworkHost
      10.2.RegAsm.exe.6af0000.31.raw.unpackNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
      • 0x39eb:$x2: NanoCore.ClientPluginHost
      • 0x3b36:$s4: PipeCreated
      • 0x3a05:$s5: IClientLoggingHost
      10.2.RegAsm.exe.6540000.24.raw.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x4bbb:$x1: NanoCore.ClientPluginHost
      • 0x4be5:$x2: IClientNetworkHost
      Click to see the 148 entries

      Sigma Overview

      AV Detection:

      barindex
      Sigma detected: NanoCoreShow sources
      Source: File createdAuthor: Joe Security: Data: EventID: 11, Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308, TargetFilename: C:\Users\user\AppData\Roaming\D06ED635-68F6-4E9A-955C-4899F5F57B9A\run.dat

      E-Banking Fraud:

      barindex
      Sigma detected: NanoCoreShow sources
      Source: File createdAuthor: Joe Security: Data: EventID: 11, Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308, TargetFilename: C:\Users\user\AppData\Roaming\D06ED635-68F6-4E9A-955C-4899F5F57B9A\run.dat

      System Summary:

      barindex
      Sigma detected: Suspicious Process Start Without DLLShow sources
      Source: Process startedAuthor: Florian Roth: Data: Command: C:\Users\user\AppData\Local\Temp\RegAsm.exe, CommandLine: C:\Users\user\AppData\Local\Temp\RegAsm.exe, CommandLine|base64offset|contains: , Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, NewProcessName: C:\Users\user\AppData\Local\Temp\RegAsm.exe, OriginalFileName: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ParentCommandLine: 'C:\Users\user\Desktop\Paidcheck.pdf.exe' , ParentImage: C:\Users\user\Desktop\Paidcheck.pdf.exe, ParentProcessId: 4608, ProcessCommandLine: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308
      Sigma detected: Suspicious Script Execution From Temp FolderShow sources
      Source: Process startedAuthor: Florian Roth, Max Altgelt: Data: Command: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , CommandLine: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , CommandLine|base64offset|contains: , Image: C:\Windows\SysWOW64\wscript.exe, NewProcessName: C:\Windows\SysWOW64\wscript.exe, OriginalFileName: C:\Windows\SysWOW64\wscript.exe, ParentCommandLine: 'C:\Users\user\Desktop\Paidcheck.pdf.exe' , ParentImage: C:\Users\user\Desktop\Paidcheck.pdf.exe, ParentProcessId: 4608, ProcessCommandLine: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , ProcessId: 1968
      Sigma detected: WScript or CScript DropperShow sources
      Source: Process startedAuthor: Margaritis Dimitrios (idea), Florian Roth (rule), oscd.community: Data: Command: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , CommandLine: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , CommandLine|base64offset|contains: , Image: C:\Windows\SysWOW64\wscript.exe, NewProcessName: C:\Windows\SysWOW64\wscript.exe, OriginalFileName: C:\Windows\SysWOW64\wscript.exe, ParentCommandLine: 'C:\Users\user\Desktop\Paidcheck.pdf.exe' , ParentImage: C:\Users\user\Desktop\Paidcheck.pdf.exe, ParentProcessId: 4608, ProcessCommandLine: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , ProcessId: 1968
      Sigma detected: Non Interactive PowerShellShow sources
      Source: Process startedAuthor: Roberto Rodriguez @Cyb3rWard0g (rule), oscd.community (improvements): Data: Command: 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe' Set-MpPreference -ExclusionPath C:\,'C:\Users\user\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\dwrn\explorerr.exe', CommandLine: 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe' Set-MpPreference -ExclusionPath C:\,'C:\Users\user\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\dwrn\explorerr.exe', CommandLine|base64offset|contains: I~2yzw, Image: C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe, NewProcessName: C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe, OriginalFileName: C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe, ParentCommandLine: 'C:\Windows\System32\WScript.exe' 'C:\Users\user\AppData\Local\Temp\_Fimmlfqfvyftboxhdsnydr.vbs' , ParentImage: C:\Windows\SysWOW64\wscript.exe, ParentProcessId: 1968, ProcessCommandLine: 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe' Set-MpPreference -ExclusionPath C:\,'C:\Users\user\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\dwrn\explorerr.exe', ProcessId: 748
      Sigma detected: Possible Applocker BypassShow sources
      Source: Process startedAuthor: juju4: Data: Command: C:\Users\user\AppData\Local\Temp\RegAsm.exe, CommandLine: C:\Users\user\AppData\Local\Temp\RegAsm.exe, CommandLine|base64offset|contains: , Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, NewProcessName: C:\Users\user\AppData\Local\Temp\RegAsm.exe, OriginalFileName: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ParentCommandLine: 'C:\Users\user\Desktop\Paidcheck.pdf.exe' , ParentImage: C:\Users\user\Desktop\Paidcheck.pdf.exe, ParentProcessId: 4608, ProcessCommandLine: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308

      Stealing of Sensitive Information:

      barindex
      Sigma detected: NanoCoreShow sources
      Source: File createdAuthor: Joe Security: Data: EventID: 11, Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308, TargetFilename: C:\Users\user\AppData\Roaming\D06ED635-68F6-4E9A-955C-4899F5F57B9A\run.dat

      Remote Access Functionality:

      barindex
      Sigma detected: NanoCoreShow sources
      Source: File createdAuthor: Joe Security: Data: EventID: 11, Image: C:\Users\user\AppData\Local\Temp\RegAsm.exe, ProcessId: 2308, TargetFilename: C:\Users\user\AppData\Roaming\D06ED635-68F6-4E9A-955C-4899F5F57B9A\run.dat

      Jbx Signature Overview

      Click to jump to signature section

      Show All Signature Results

      AV Detection: