Analysis

  • max time kernel
    59s
  • max time network
    60s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    29-03-2021 07:05

Errors

Reason
Machine shutdown

General

  • Target

    874bcf36482b83f3df470655e985e29b.exe

  • Size

    162KB

  • MD5

    874bcf36482b83f3df470655e985e29b

  • SHA1

    bbcfeea3e3b437680cbf14c8016b3954cac1398a

  • SHA256

    1c259208bdea5d896335c7a22d7a3048e4cfe0c7578a466f8faad880446f4e02

  • SHA512

    688cd7b19786c7c41079a1867a394ade9ed1201f10f38c408d52bae8da9edcd42b433ae979de6b68ed4bbf628201228c45ec4d9a03987851782265c19b0da8c6

Malware Config

Extracted

Family

smokeloader

Version

2020

C2

http://xsss99.icu/upload/

http://bingooodsg.icu/upload/

http://junntd.xyz/upload/

http://ginessa11.xyz/upload/

http://overplayninsx.xyz/upload/

http://bananinze.com/upload/

http://daunimlas.com/upload/

rc4.i32
rc4.i32

Signatures

  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 9 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Sets service image path in registry 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in System32 directory 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 17 IoCs
  • Suspicious use of WriteProcessMemory 56 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\874bcf36482b83f3df470655e985e29b.exe
    "C:\Users\Admin\AppData\Local\Temp\874bcf36482b83f3df470655e985e29b.exe"
    1⤵
    • Loads dropped DLL
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:496
  • C:\Users\Admin\AppData\Local\Temp\E47A.exe
    C:\Users\Admin\AppData\Local\Temp\E47A.exe
    1⤵
    • Executes dropped EXE
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:3308
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\88f60da4-d0da-4e37-89b8-c779aa247322" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:2600
    • C:\Users\Admin\AppData\Local\Temp\E47A.exe
      "C:\Users\Admin\AppData\Local\Temp\E47A.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:1312
      • C:\Users\Admin\AppData\Local\e048c6e3-baae-4250-a06b-05b803d58de9\updatewin.exe
        "C:\Users\Admin\AppData\Local\e048c6e3-baae-4250-a06b-05b803d58de9\updatewin.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:720
        • C:\Windows\SysWOW64\cmd.exe
          /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\e048c6e3-baae-4250-a06b-05b803d58de9\updatewin.exe
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3400
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 3
            5⤵
            • Delays execution with timeout.exe
            PID:200
      • C:\Users\Admin\AppData\Local\e048c6e3-baae-4250-a06b-05b803d58de9\5.exe
        "C:\Users\Admin\AppData\Local\e048c6e3-baae-4250-a06b-05b803d58de9\5.exe"
        3⤵
        • Executes dropped EXE
        PID:2504
  • C:\Users\Admin\AppData\Local\Temp\ED83.exe
    C:\Users\Admin\AppData\Local\Temp\ED83.exe
    1⤵
    • Executes dropped EXE
    PID:3644
  • C:\Users\Admin\AppData\Local\Temp\FB5F.exe
    C:\Users\Admin\AppData\Local\Temp\FB5F.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:2816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wzkwstev\
      2⤵
        PID:3456
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wwxideck.exe" C:\Windows\SysWOW64\wzkwstev\
        2⤵
          PID:1180
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wzkwstev binPath= "C:\Windows\SysWOW64\wzkwstev\wwxideck.exe /d\"C:\Users\Admin\AppData\Local\Temp\FB5F.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:2160
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description wzkwstev "wifi internet conection"
            2⤵
              PID:2268
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start wzkwstev
              2⤵
                PID:2340
              • C:\Windows\SysWOW64\netsh.exe
                "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
                2⤵
                  PID:356
              • C:\Windows\SysWOW64\wzkwstev\wwxideck.exe
                C:\Windows\SysWOW64\wzkwstev\wwxideck.exe /d"C:\Users\Admin\AppData\Local\Temp\FB5F.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2756
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Drops file in System32 directory
                  • Modifies data under HKEY_USERS
                  PID:3808
              • C:\Users\Admin\AppData\Local\Temp\161C.exe
                C:\Users\Admin\AppData\Local\Temp\161C.exe
                1⤵
                • Executes dropped EXE
                • Checks BIOS information in registry
                • Checks whether UAC is enabled
                • Suspicious use of NtSetInformationThreadHideFromDebugger
                PID:2084
              • C:\Users\Admin\AppData\Local\Temp\1CB4.exe
                C:\Users\Admin\AppData\Local\Temp\1CB4.exe
                1⤵
                • Executes dropped EXE
                • Writes to the Master Boot Record (MBR)
                • Suspicious use of AdjustPrivilegeToken
                PID:3288

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • memory/496-3-0x0000000000950000-0x0000000000959000-memory.dmp

                Filesize

                36KB

              • memory/496-2-0x0000000002600000-0x0000000002601000-memory.dmp

                Filesize

                4KB

              • memory/496-4-0x0000000000400000-0x0000000000409000-memory.dmp

                Filesize

                36KB

              • memory/720-43-0x00000000024D0000-0x00000000024D1000-memory.dmp

                Filesize

                4KB

              • memory/720-57-0x0000000000400000-0x0000000000437000-memory.dmp

                Filesize

                220KB

              • memory/720-55-0x0000000002430000-0x0000000002466000-memory.dmp

                Filesize

                216KB

              • memory/1312-20-0x0000000001C80000-0x0000000001C81000-memory.dmp

                Filesize

                4KB

              • memory/2084-71-0x0000000000400000-0x0000000000BDD000-memory.dmp

                Filesize

                7.9MB

              • memory/2084-92-0x0000000003310000-0x000000000333B000-memory.dmp

                Filesize

                172KB

              • memory/2084-88-0x0000000005580000-0x0000000005581000-memory.dmp

                Filesize

                4KB

              • memory/2084-87-0x0000000002F10000-0x0000000002F3D000-memory.dmp

                Filesize

                180KB

              • memory/2084-89-0x0000000005570000-0x0000000005571000-memory.dmp

                Filesize

                4KB

              • memory/2084-90-0x0000000005572000-0x0000000005573000-memory.dmp

                Filesize

                4KB

              • memory/2084-73-0x0000000077354000-0x0000000077355000-memory.dmp

                Filesize

                4KB

              • memory/2084-74-0x0000000003000000-0x0000000003001000-memory.dmp

                Filesize

                4KB

              • memory/2084-91-0x0000000005573000-0x0000000005574000-memory.dmp

                Filesize

                4KB

              • memory/2084-94-0x0000000005574000-0x0000000005576000-memory.dmp

                Filesize

                8KB

              • memory/2084-83-0x0000000070DD0000-0x00000000714BE000-memory.dmp

                Filesize

                6.9MB

              • memory/2084-93-0x0000000003340000-0x0000000003341000-memory.dmp

                Filesize

                4KB

              • memory/2504-44-0x0000000002500000-0x0000000002501000-memory.dmp

                Filesize

                4KB

              • memory/2504-59-0x0000000000400000-0x0000000000498000-memory.dmp

                Filesize

                608KB

              • memory/2504-58-0x0000000002500000-0x0000000002595000-memory.dmp

                Filesize

                596KB

              • memory/2504-47-0x0000000002900000-0x0000000002901000-memory.dmp

                Filesize

                4KB

              • memory/2756-78-0x0000000001260000-0x0000000001261000-memory.dmp

                Filesize

                4KB

              • memory/2756-85-0x0000000000400000-0x0000000000415000-memory.dmp

                Filesize

                84KB

              • memory/2816-49-0x0000000002580000-0x0000000002581000-memory.dmp

                Filesize

                4KB

              • memory/2816-61-0x0000000000400000-0x0000000000415000-memory.dmp

                Filesize

                84KB

              • memory/2816-51-0x0000000002580000-0x0000000002581000-memory.dmp

                Filesize

                4KB

              • memory/2816-60-0x0000000000840000-0x0000000000853000-memory.dmp

                Filesize

                76KB

              • memory/3016-6-0x0000000000E30000-0x0000000000E46000-memory.dmp

                Filesize

                88KB

              • memory/3288-95-0x0000000002680000-0x0000000002681000-memory.dmp

                Filesize

                4KB

              • memory/3288-96-0x00000000008F0000-0x000000000095B000-memory.dmp

                Filesize

                428KB

              • memory/3288-97-0x0000000000400000-0x000000000046F000-memory.dmp

                Filesize

                444KB

              • memory/3308-12-0x0000000000400000-0x0000000000537000-memory.dmp

                Filesize

                1.2MB

              • memory/3308-10-0x0000000001C90000-0x0000000001C91000-memory.dmp

                Filesize

                4KB

              • memory/3308-11-0x0000000001AA0000-0x0000000001BBA000-memory.dmp

                Filesize

                1.1MB

              • memory/3644-38-0x00000000024C0000-0x0000000002555000-memory.dmp

                Filesize

                596KB

              • memory/3644-39-0x0000000000400000-0x0000000000498000-memory.dmp

                Filesize

                608KB

              • memory/3644-28-0x0000000002620000-0x0000000002621000-memory.dmp

                Filesize

                4KB

              • memory/3808-81-0x0000000002B50000-0x0000000002B65000-memory.dmp

                Filesize

                84KB