Analysis

  • max time kernel
    140s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 11:47

General

  • Target

    a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41.exe

  • Size

    266KB

  • MD5

    573b4d1509a8e28f3c823538332f9cd1

  • SHA1

    1cbc4336f626fb0faa85d0309e8338b4ad5b0adb

  • SHA256

    a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41

  • SHA512

    2b69ee51d626bd2ae09f02e29793428648c818549afe5a034e62f06f8d7920f062d4914cc4876b8d89bd36ada7cacf10ea577e42e7d213dbc934ee198385a3b7

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\a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41.exe
    "C:\Users\Admin\AppData\Local\Temp\a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3196
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qbfaljbj\
      2⤵
        PID:808
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xtorbxbm.exe" C:\Windows\SysWOW64\qbfaljbj\
        2⤵
          PID:2692
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qbfaljbj binPath= "C:\Windows\SysWOW64\qbfaljbj\xtorbxbm.exe /d\"C:\Users\Admin\AppData\Local\Temp\a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qbfaljbj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4428
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qbfaljbj
          2⤵
          • Launches sc.exe
          PID:4884
        • 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:864
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3196 -s 1212
          2⤵
          • Program crash
          PID:3632
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3196 -ip 3196
        1⤵
          PID:5016
        • C:\Windows\SysWOW64\qbfaljbj\xtorbxbm.exe
          C:\Windows\SysWOW64\qbfaljbj\xtorbxbm.exe /d"C:\Users\Admin\AppData\Local\Temp\a2ecea288c6585f8c9d92d206781d1db7354db86ba8d5edfee14862d55f76d41.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4836
          • 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:4632
            • 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:4276
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4836 -s 508
            2⤵
            • Program crash
            PID:3304
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 4836 -ip 4836
          1⤵
            PID:3692

          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\xtorbxbm.exe
            Filesize

            10.0MB

            MD5

            b02af8543d50413d195318942502e04d

            SHA1

            ded1efd8aa8f958958bdfae0edb725cb931e0dfb

            SHA256

            bfdd9a0b6777ba597a2c88f050bf46c7f01ca464c45b4d585c7892c6eedbe56a

            SHA512

            e1739f740960e6922f9814c5b73efacfc95e498c54653fd9f02d148d88e9f4d64392ff48f57fcacbf518a978d4a1786776a3d77a2d566bd7d790844b8a7d63ea

          • C:\Windows\SysWOW64\qbfaljbj\xtorbxbm.exe
            Filesize

            10.0MB

            MD5

            b02af8543d50413d195318942502e04d

            SHA1

            ded1efd8aa8f958958bdfae0edb725cb931e0dfb

            SHA256

            bfdd9a0b6777ba597a2c88f050bf46c7f01ca464c45b4d585c7892c6eedbe56a

            SHA512

            e1739f740960e6922f9814c5b73efacfc95e498c54653fd9f02d148d88e9f4d64392ff48f57fcacbf518a978d4a1786776a3d77a2d566bd7d790844b8a7d63ea

          • memory/808-130-0x0000000000000000-mapping.dmp
          • memory/864-139-0x0000000000000000-mapping.dmp
          • memory/1556-136-0x0000000000000000-mapping.dmp
          • memory/2692-134-0x0000000000000000-mapping.dmp
          • memory/3196-133-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/3196-132-0x0000000003040000-0x0000000003053000-memory.dmp
            Filesize

            76KB

          • memory/3196-141-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/3196-131-0x0000000002E82000-0x0000000002E92000-memory.dmp
            Filesize

            64KB

          • memory/4276-168-0x0000000000000000-mapping.dmp
          • memory/4276-174-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4276-169-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4428-137-0x0000000000000000-mapping.dmp
          • memory/4632-142-0x0000000000000000-mapping.dmp
          • memory/4632-147-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4632-149-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4632-150-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4632-153-0x00000000025B0000-0x00000000025B6000-memory.dmp
            Filesize

            24KB

          • memory/4632-156-0x00000000025E0000-0x00000000025F0000-memory.dmp
            Filesize

            64KB

          • memory/4632-159-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/4632-162-0x0000000007F40000-0x000000000834B000-memory.dmp
            Filesize

            4.0MB

          • memory/4632-165-0x00000000033D0000-0x00000000033D7000-memory.dmp
            Filesize

            28KB

          • memory/4632-143-0x0000000001240000-0x0000000001255000-memory.dmp
            Filesize

            84KB

          • memory/4836-148-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4836-146-0x000000000307E000-0x000000000308E000-memory.dmp
            Filesize

            64KB

          • memory/4884-138-0x0000000000000000-mapping.dmp