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Analysis Report FXlRSXcN37.exe


General Information

Sample Name:FXlRSXcN37.exe
Analysis ID:253848

Most interesting Screenshot:


Range:0 - 100


Detected Nanocore Rat
Found malware configuration
Malicious sample detected (through community Yara rule)
Sigma detected: NanoCore
Sigma detected: Scheduled temp file as task from temp location
Yara detected AntiVM autoit script
Yara detected Nanocore RAT
.NET source code contains potential unpacker
Connects to many ports of the same IP (likely port scanning)
Drops PE files with a suspicious file extension
Hides that the sample has been downloaded from the Internet (zone.identifier)
Protects its processes via BreakOnTermination flag
Uses dynamic DNS services
Uses schtasks.exe or at.exe to add and modify task schedules
Contains capabilities to detect virtual machines
Contains functionality for execution timing, often used to detect debuggers
Contains functionality for read data from the clipboard
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to block mouse and keyboard input (often used to hinder debugging)
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to check if a window is minimized (may be used to check if an application is visible)
Contains functionality to communicate with device drivers
Contains functionality to dynamically determine API calls
Contains functionality to execute programs as a different user
Contains functionality to launch a process as a different user
Contains functionality to launch a program with higher privileges
Contains functionality to open a port and listen for incoming connection (possibly a backdoor)
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to read the clipboard data
Contains functionality to retrieve information about pressed keystrokes
Contains functionality to shutdown / reboot the system
Contains functionality to simulate keystroke presses
Contains functionality to simulate mouse events
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
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
File is packed with WinRar
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found potential string decryption / allocating functions
Installs a raw input device (often for capturing keystrokes)
May sleep (evasive loops) to hinder dynamic analysis
OS version to string mapping found (often used in BOTs)
PE file contains executable resources (Code or Archives)
PE file contains strange resources
Potential key logger detected (key state polling based)
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
Tries to load missing DLLs
Uses code obfuscation techniques (call, push, ret)
Yara signature match



  • System is w10x64
  • FXlRSXcN37.exe (PID: 7012 cmdline: 'C:\Users\user\Desktop\FXlRSXcN37.exe' MD5: D24F7996EC1820AF0CEFA17FA21B961B)
    • vaevkufnfe.pif (PID: 688 cmdline: 'C:\Users\user\AppData\Local\Temp\87305237\vaevkufnfe.pif' xwnnlg.tdc MD5: D3FFBDE7EA1BCB2D0A6E6E12B0306625)
      • RegSvcs.exe (PID: 4584 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe MD5: 2867A3817C9245F7CF518524DFD18F28)
        • schtasks.exe (PID: 6088 cmdline: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp31FB.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
          • conhost.exe (PID: 5044 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • RegSvcs.exe (PID: 6188 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe 0 MD5: 2867A3817C9245F7CF518524DFD18F28)
    • conhost.exe (PID: 6180 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • vaevkufnfe.pif (PID: 6104 cmdline: 'C:\Users\user\AppData\Local\Temp\87305237\VAEVKU~1.PIF' C:\Users\user\AppData\Local\Temp\87305237\xwnnlg.tdc MD5: D3FFBDE7EA1BCB2D0A6E6E12B0306625)
    • RegSvcs.exe (PID: 5756 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe MD5: 2867A3817C9245F7CF518524DFD18F28)
  • vaevkufnfe.pif (PID: 7096 cmdline: 'C:\Users\user\AppData\Local\Temp\87305237\VAEVKU~1.PIF' C:\Users\user\AppData\Local\Temp\87305237\xwnnlg.tdc MD5: D3FFBDE7EA1BCB2D0A6E6E12B0306625)
    • RegSvcs.exe (PID: 6244 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe MD5: 2867A3817C9245F7CF518524DFD18F28)
  • vaevkufnfe.pif (PID: 4552 cmdline: 'C:\Users\user\AppData\Local\Temp\87305237\VAEVKU~1.PIF' C:\Users\user\AppData\Local\Temp\87305237\xwnnlg.tdc MD5: D3FFBDE7EA1BCB2D0A6E6E12B0306625)
    • RegSvcs.exe (PID: 4400 cmdline: C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe MD5: 2867A3817C9245F7CF518524DFD18F28)
  • cleanup

Malware Configuration

Threatname: NanoCore

{"C2: ": ["", ""], "Version: ": "NanoCore Client, Version="}

Yara Overview

Memory Dumps

0000000E.00000003.1402299177.00000000040FE000.00000004.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
  • 0xf7ad:$x1: NanoCore.ClientPluginHost
  • 0xf7ea:$x2: IClientNetworkHost
  • 0x1331d:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
0000000E.00000003.1402299177.00000000040FE000.00000004.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
    0000000E.00000003.1402299177.00000000040FE000.00000004.00000001.sdmpNanoCoreunknown Kevin Breen <kevin@techanarchy.net>
    • 0xf515:$a: NanoCore
    • 0xf525:$a: NanoCore
    • 0xf759:$a: NanoCore
    • 0xf76d:$a: NanoCore
    • 0xf7ad:$a: NanoCore
    • 0xf574:$b: ClientPlugin
    • 0xf776:$b: ClientPlugin
    • 0xf7b6:$b: ClientPlugin
    • 0xf69b:$c: ProjectData
    • 0x100a2:$d: DESCrypto
    • 0x17a6e:$e: KeepAlive
    • 0x15a5c:$g: LogClientMessage
    • 0x11c57:$i: get_Connected
    • 0x103d8:$j: #=q
    • 0x10408:$j: #=q
    • 0x10424:$j: #=q
    • 0x10454:$j: #=q
    • 0x10470:$j: #=q
    • 0x1048c:$j: #=q
    • 0x104bc:$j: #=q
    • 0x104d8:$j: #=q
    00000001.00000003.1313428225.00000000042F6000.00000004.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
    • 0xf405:$x1: NanoCore.ClientPluginHost
    • 0xf442:$x2: IClientNetworkHost
    • 0x12f75:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
    00000001.00000003.1313428225.00000000042F6000.00000004.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
      Click to see the 243 entries

      Unpacked PEs

      3.2.RegSvcs.exe.66c0000.4.raw.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x1646:$x1: NanoCore.ClientPluginHost
      3.2.RegSvcs.exe.66c0000.4.raw.unpackNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
      • 0x1646:$x2: NanoCore.ClientPluginHost
      • 0x1724:$s4: PipeCreated
      • 0x1660:$s5: IClientLoggingHost
      22.2.RegSvcs.exe.f00000.0.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x1018d:$x1: NanoCore.ClientPluginHost
      • 0x101ca:$x2: IClientNetworkHost
      • 0x13cfd:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
      22.2.RegSvcs.exe.f00000.0.unpackNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
      • 0xff05:$x1: NanoCore Client.exe
      • 0x1018d:$x2: NanoCore.ClientPluginHost
      • 0x117c6:$s1: PluginCommand
      • 0x117ba:$s2: FileCommand
      • 0x1266b:$s3: PipeExists
      • 0x18422:$s4: PipeCreated
      • 0x101b7:$s5: IClientLoggingHost
      22.2.RegSvcs.exe.f00000.0.unpackJoeSecurity_NanocoreYara detected Nanocore RATJoe Security