Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2023 18:02

General

  • Target

    13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610.exe

  • Size

    351KB

  • MD5

    4a18a94055dba3c5ad2fa1a10582eec3

  • SHA1

    fc0c32941f69383c2ab6ae53af514331fe68af84

  • SHA256

    13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610

  • SHA512

    5bf4346b3fce12a314f6327f840d88e2ea1d7f00c5fecb7f2b14d2eb69a447008bccc52508728791a7a8eaecccfa0b99fe51c032875e18adc64a212434e5fbf4

  • SSDEEP

    6144:aVvvhSKsCU9XmGm0kn0MM7FOmSafuzq+7XUBybbCt:aVvkKsFMGm0k0MM7lSqutDUub

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • 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). 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\13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610.exe
    "C:\Users\Admin\AppData\Local\Temp\13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3812
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uhegvvlm\
      2⤵
        PID:4620
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\udjushz.exe" C:\Windows\SysWOW64\uhegvvlm\
        2⤵
          PID:4044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uhegvvlm binPath= "C:\Windows\SysWOW64\uhegvvlm\udjushz.exe /d\"C:\Users\Admin\AppData\Local\Temp\13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:264
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uhegvvlm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3880
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uhegvvlm
          2⤵
          • Launches sc.exe
          PID:2828
        • 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:412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3812 -s 1040
          2⤵
          • Program crash
          PID:4460
      • C:\Windows\SysWOW64\uhegvvlm\udjushz.exe
        C:\Windows\SysWOW64\uhegvvlm\udjushz.exe /d"C:\Users\Admin\AppData\Local\Temp\13b61045b92866c3ab14e075ea80fa6c4e63ef3e22eb582bf542cbfb2ae6f610.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4128
        • 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:2600
          • 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:3512
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4128 -s 524
          2⤵
          • Program crash
          PID:3600
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3812 -ip 3812
        1⤵
          PID:4960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4128 -ip 4128
          1⤵
            PID:3668

          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\udjushz.exe
            Filesize

            13.4MB

            MD5

            9f7a441417da948f5c97a8cd824e3855

            SHA1

            8cf34574a61b5e60073d7f1174dc8451600bc0c8

            SHA256

            8526361d84b959196c88cf0035a005a7f36b44eeb0e5c508d1eb7b1fb4609301

            SHA512

            bb8ac32ebae6153546c612a092e9adb815d105a967b594daa8b2fd20f42140ca4531d3366c6b35ad2c8e814794061e8cfdd39a92be3197a89653136d68509518

          • C:\Windows\SysWOW64\uhegvvlm\udjushz.exe
            Filesize

            13.4MB

            MD5

            9f7a441417da948f5c97a8cd824e3855

            SHA1

            8cf34574a61b5e60073d7f1174dc8451600bc0c8

            SHA256

            8526361d84b959196c88cf0035a005a7f36b44eeb0e5c508d1eb7b1fb4609301

            SHA512

            bb8ac32ebae6153546c612a092e9adb815d105a967b594daa8b2fd20f42140ca4531d3366c6b35ad2c8e814794061e8cfdd39a92be3197a89653136d68509518

          • memory/2600-167-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-148-0x00000000008A0000-0x00000000008B5000-memory.dmp
            Filesize

            84KB

          • memory/2600-170-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-143-0x00000000008A0000-0x00000000008B5000-memory.dmp
            Filesize

            84KB

          • memory/2600-184-0x00000000029E0000-0x00000000029E7000-memory.dmp
            Filesize

            28KB

          • memory/2600-145-0x00000000008A0000-0x00000000008B5000-memory.dmp
            Filesize

            84KB

          • memory/2600-146-0x00000000008A0000-0x00000000008B5000-memory.dmp
            Filesize

            84KB

          • memory/2600-169-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-149-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/2600-152-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/2600-153-0x0000000001BE0000-0x0000000001BE6000-memory.dmp
            Filesize

            24KB

          • memory/2600-156-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-183-0x0000000007440000-0x000000000784B000-memory.dmp
            Filesize

            4.0MB

          • memory/2600-161-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-159-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-162-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-163-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-164-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-165-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-166-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-160-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-180-0x0000000007440000-0x000000000784B000-memory.dmp
            Filesize

            4.0MB

          • memory/2600-140-0x00000000008A0000-0x00000000008B5000-memory.dmp
            Filesize

            84KB

          • memory/2600-168-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-171-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-172-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-173-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-174-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-175-0x0000000001BF0000-0x0000000001C00000-memory.dmp
            Filesize

            64KB

          • memory/2600-176-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/2600-179-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/3512-188-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-193-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-194-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-195-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-197-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-196-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-198-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3512-199-0x0000000000A50000-0x0000000000B41000-memory.dmp
            Filesize

            964KB

          • memory/3812-138-0x0000000000400000-0x00000000007FC000-memory.dmp
            Filesize

            4.0MB

          • memory/3812-135-0x00000000008C0000-0x00000000008D3000-memory.dmp
            Filesize

            76KB

          • memory/4128-144-0x0000000000400000-0x00000000007FC000-memory.dmp
            Filesize

            4.0MB