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Analysis Report BL Draft DOC-20200731-PL#INV203948.exe

Overview

General Information

Sample Name:BL Draft DOC-20200731-PL#INV203948.exe
Analysis ID:255352
MD5:ce61e73565f2880b720b3997174e3258
SHA1:05b2ac8e4f2e43b818e1c499ff2e3dba13b1f63d
SHA256:7f0bd5d4fdb77f5c7944ba26cf6028a8f7f3f92e674611385f6cdd1e5258708d

Most interesting Screenshot:

Detection

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

Signatures

Detected Nanocore Rat
Detected unpacking (changes PE section rights)
Detected unpacking (creates a PE file in dynamic memory)
Detected unpacking (overwrites its own PE header)
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 Nanocore RAT
.NET source code contains potential unpacker
Contains functionality to detect sleep reduction / modifications
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for dropped file
Machine Learning detection for sample
Maps a DLL or memory area into another process
Uses schtasks.exe or at.exe to add and modify task schedules
Checks if the current process is being debugged
Contains functionality to call native functions
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 detect sandboxes (mouse cursor move detection)
Contains functionality to dynamically determine API calls
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 record screenshots
Contains functionality to retrieve information about pressed keystrokes
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
Extensive use of GetProcAddress (often used to hide API calls)
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
PE file contains strange resources
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Uses code obfuscation techniques (call, push, ret)
Yara signature match

Classification

Startup

  • System is w10x64
  • BL Draft DOC-20200731-PL#INV203948.exe (PID: 6860 cmdline: 'C:\Users\user\Desktop\BL Draft DOC-20200731-PL#INV203948.exe' MD5: CE61E73565F2880B720B3997174E3258)
    • BL Draft DOC-20200731-PL#INV203948.exe (PID: 6876 cmdline: 'C:\Users\user\Desktop\BL Draft DOC-20200731-PL#INV203948.exe' MD5: CE61E73565F2880B720B3997174E3258)
      • schtasks.exe (PID: 7004 cmdline: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp819A.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
        • conhost.exe (PID: 7012 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • schtasks.exe (PID: 7056 cmdline: 'schtasks.exe' /create /f /tn 'DHCP Monitor Task' /xml 'C:\Users\user\AppData\Local\Temp\tmp84F6.tmp' MD5: 15FF7D8324231381BAD48A052F85DF04)
        • conhost.exe (PID: 7064 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • dhcpmon.exe (PID: 7136 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' 0 MD5: CE61E73565F2880B720B3997174E3258)
    • dhcpmon.exe (PID: 6204 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' 0 MD5: CE61E73565F2880B720B3997174E3258)
  • dhcpmon.exe (PID: 5656 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' MD5: CE61E73565F2880B720B3997174E3258)
    • dhcpmon.exe (PID: 6436 cmdline: 'C:\Program Files (x86)\DHCP Monitor\dhcpmon.exe' MD5: CE61E73565F2880B720B3997174E3258)
  • cleanup

Malware Configuration

Threatname: NanoCore

{"C2: ": ["185.244.29.130"], "Version: ": "NanoCore Client, Version=1.2.2.0"}

Yara Overview

Memory Dumps

SourceRuleDescriptionAuthorStrings
00000002.00000002.482728448.0000000000447000.00000040.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
  • 0x101e5:$x1: NanoCore.ClientPluginHost
  • 0x10222:$x2: IClientNetworkHost
  • 0x13d55:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
00000002.00000002.482728448.0000000000447000.00000040.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
    00000002.00000002.482728448.0000000000447000.00000040.00000001.sdmpNanoCoreunknown Kevin Breen <kevin@techanarchy.net>
    • 0xff4d:$a: NanoCore
    • 0xff5d:$a: NanoCore
    • 0x10191:$a: NanoCore
    • 0x101a5:$a: NanoCore
    • 0x101e5:$a: NanoCore
    • 0xffac:$b: ClientPlugin
    • 0x101ae:$b: ClientPlugin
    • 0x101ee:$b: ClientPlugin
    • 0x100d3:$c: ProjectData
    • 0x10ada:$d: DESCrypto
    • 0x184a6:$e: KeepAlive
    • 0x16494:$g: LogClientMessage
    • 0x1268f:$i: get_Connected
    • 0x10e10:$j: #=q
    • 0x10e40:$j: #=q
    • 0x10e5c:$j: #=q
    • 0x10e8c:$j: #=q
    • 0x10ea8:$j: #=q
    • 0x10ec4:$j: #=q
    • 0x10ef4:$j: #=q
    • 0x10f10:$j: #=q
    0000000A.00000002.245595981.0000000000402000.00000040.00000001.sdmpNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
    • 0xff8d:$x1: NanoCore.ClientPluginHost
    • 0xffca:$x2: IClientNetworkHost
    • 0x13afd:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
    0000000A.00000002.245595981.0000000000402000.00000040.00000001.sdmpJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
      Click to see the 129 entries

      Unpacked PEs

      SourceRuleDescriptionAuthorStrings
      10.2.dhcpmon.exe.2140000.3.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
      • 0x1018d:$x1: NanoCore.ClientPluginHost
      • 0x101ca:$x2: IClientNetworkHost
      • 0x13cfd:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
      10.2.dhcpmon.exe.2140000.3.unpackNanocore_RAT_Feb18_1Detects Nanocore RATFlorian Roth
      • 0xff05:$x1: NanoCore Client.exe
      • 0x1018d:$x2: NanoCore.ClientPluginHost
      • 0x117c6:$s1: PluginCommand
      • 0x117ba:$s2: FileCommand
      • 0x1266b:$s3: PipeExists
      • 0x18422:$s4: PipeCreated
      • 0x101b7:$s5: IClientLoggingHost
      10.2.dhcpmon.exe.2140000.3.unpackJoeSecurity_NanocoreYara detected Nanocore RATJoe Security
        10.2.dhcpmon.exe.2140000.3.unpackNanoCoreunknown Kevin Breen <kevin@techanarchy.net>
        • 0xfef5:$a: NanoCore
        • 0xff05:$a: NanoCore
        • 0x10139:$a: NanoCore
        • 0x1014d:$a: NanoCore
        • 0x1018d:$a: NanoCore
        • 0xff54:$b: ClientPlugin
        • 0x10156:$b: ClientPlugin
        • 0x10196:$b: ClientPlugin
        • 0x1007b:$c: ProjectData
        • 0x10a82:$d: DESCrypto
        • 0x1844e:$e: KeepAlive
        • 0x1643c:$g: LogClientMessage
        • 0x12637:$i: get_Connected
        • 0x10db8:$j: #=q
        • 0x10de8:$j: #=q
        • 0x10e04:$j: #=q
        • 0x10e34:$j: #=q
        • 0x10e50:$j: #=q
        • 0x10e6c:$j: #=q
        • 0x10e9c:$j: #=q
        • 0x10eb8:$j: #=q
        11.2.dhcpmon.exe.2560000.2.unpackNanocore_RAT_Gen_2Detetcs the Nanocore RATFlorian Roth
        • 0x61f8d:$x1: NanoCore.ClientPluginHost
        • 0x61fca:$x2: IClientNetworkHost
        • 0x65afd:$x3: #=qjgz7ljmpp0J7FvL9dmi8ctJILdgtcbw8JYUc6GC8MeJ9B11Crfg2Djxcf0p8PZGe
        Click to see the 103 entries

        Sigma Overview

        System Summary:

        barindex
        Sigma detected: NanoCoreShow sources
        Source: File createdAuthor: Joe Security: Data: EventID: 11, Image: C:\Users\user\Desktop\BL Draft DOC-20200731-PL#INV203948.exe, ProcessId: 6876, TargetFilename: C:\Users\user\AppData\Roaming\D06ED635-68F6-4E9A-955C-4899F5F57B9A\run.dat
        Sigma detected: Scheduled temp file as task from temp locationShow sources
        Source: Process startedAuthor: Joe Security: Data: Command: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp819A.tmp', CommandLine: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp819A.tmp', CommandLine|base64offset|contains: j, Image: C:\Windows\SysWOW64\schtasks.exe, NewProcessName: C:\Windows\SysWOW64\schtasks.exe, OriginalFileName: C:\Windows\SysWOW64\schtasks.exe, ParentCommandLine: 'C:\Users\user\Desktop\BL Draft DOC-20200731-PL#INV203948.exe' , ParentImage: C:\Users\user\Desktop\BL Draft DOC-20200731-PL#INV203948.exe, ParentProcessId: 6876, ProcessCommandLine: 'schtasks.exe' /create /f /tn 'DHCP Monitor' /xml 'C:\Users\user\AppData\Local\Temp\tmp819A.tmp', ProcessId: 7004

        Signature Overview

        Click to jump to signature section

        Show All Signature Results

        AV Detection:

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