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Analysis

  • max time kernel
    159s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/03/2024, 17:09

General

  • Target

    cbf5e424dc90b592d06e8f30f37c1e6b.exe

  • Size

    13.2MB

  • MD5

    cbf5e424dc90b592d06e8f30f37c1e6b

  • SHA1

    c036166895f21a873d666560bfd7e7fce142f260

  • SHA256

    2e3bb86704384f0a25c46a9b79a7f2ae0168709d3560d94f92acfd51bd6a7637

  • SHA512

    0fec8527110f2c75dc3cb6b61a97fe544596f1b1575a6ac025420fa9fdd651c3dc6c4db5dcc4e1bfb8b29d1bde34c3302f2801430a5140dc626edb4f7d0810d6

  • SSDEEP

    6144:1KTDS3aiZOTXbKdags2FNxWUWF5zoINm/nu:QMaiZOT+dags21Wts9vu

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 2 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 5 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).

  • Program crash 3 IoCs
  • Suspicious use of WriteProcessMemory 38 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\cbf5e424dc90b592d06e8f30f37c1e6b.exe
    "C:\Users\Admin\AppData\Local\Temp\cbf5e424dc90b592d06e8f30f37c1e6b.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:4776
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hehwgsdd\
      2⤵
        PID:1348
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\anenfsuo.exe" C:\Windows\SysWOW64\hehwgsdd\
        2⤵
          PID:4544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hehwgsdd binPath= "C:\Windows\SysWOW64\hehwgsdd\anenfsuo.exe /d\"C:\Users\Admin\AppData\Local\Temp\cbf5e424dc90b592d06e8f30f37c1e6b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hehwgsdd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hehwgsdd
          2⤵
          • Launches sc.exe
          PID:5108
        • 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:4904
        • C:\Users\Admin\eilhtczv.exe
          "C:\Users\Admin\eilhtczv.exe" /d"C:\Users\Admin\AppData\Local\Temp\cbf5e424dc90b592d06e8f30f37c1e6b.exe"
          2⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:4440
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rvcgilbn.exe" C:\Windows\SysWOW64\hehwgsdd\
            3⤵
              PID:4292
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" config hehwgsdd binPath= "C:\Windows\SysWOW64\hehwgsdd\rvcgilbn.exe /d\"C:\Users\Admin\eilhtczv.exe\""
              3⤵
              • Launches sc.exe
              PID:3900
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start hehwgsdd
              3⤵
              • Launches sc.exe
              PID:1348
            • 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
              3⤵
              • Modifies Windows Firewall
              PID:3552
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 4440 -s 1108
              3⤵
              • Program crash
              PID:4936
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4776 -s 1032
            2⤵
            • Program crash
            PID:744
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4776 -ip 4776
          1⤵
            PID:3992
          • C:\Windows\SysWOW64\hehwgsdd\rvcgilbn.exe
            C:\Windows\SysWOW64\hehwgsdd\rvcgilbn.exe /d"C:\Users\Admin\eilhtczv.exe"
            1⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:412
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe
              2⤵
              • Sets service image path in registry
              PID:3744
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 412 -s 520
              2⤵
              • Program crash
              PID:112
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4440 -ip 4440
            1⤵
              PID:2424
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 412 -ip 412
              1⤵
                PID:2304
              • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
                "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4068 --field-trial-handle=2900,i,14549994492153927475,12895178890800740987,262144 --variations-seed-version /prefetch:8
                1⤵
                  PID:368

                Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  2.9MB

                  MD5

                  e80b444a789b894602d55b0579e8c7a2

                  SHA1

                  2a13df9f545b847ba91ac221a826e96c704acea9

                  SHA256

                  ac1e645a85310922650931254613c8bd3c152461f41617bf7a2d7d42e95bdfc4

                  SHA512

                  26a842ee3d3f321b3d887e45f5185a9fda3001b437b4fd59aed8a6da2f2f2df5a30601d4275db88033fabb55a842aa6cd7746038ee4bb9843cd9d9672e84d397

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

                  Filesize

                  631KB

                  MD5

                  6cef15a4194e454834d0872f2cee44b3

                  SHA1

                  5e06bc9e68d819c57eaf69c1bf6e72bac819f4c7

                  SHA256

                  d74656d24ac3205b894efa14b5c592efe50f84269e13b1b26e9ef8379c713792

                  SHA512

                  23e259a4e7e60b1dad0adf37e5d003b2b16c9260b60b3b82836bf1bf6ae75e144afb9be7fed2021ee7a50614054331b7f3de81e097005daaab54b19fb0befca9

                • C:\Users\Admin\eilhtczv.exe

                  Filesize

                  2.4MB

                  MD5

                  52182d0f6f719df3fa5d4264f162b8ec

                  SHA1

                  14626c6a0c885e2e3831dde39458257897b49327

                  SHA256

                  889605bc04f4023b99f9894d22bf0fb075869ef5cc9803c9a3deb7756f848d88

                  SHA512

                  67be1260219675f720a22c7434db75cc46f5d787c90d7a4c94e00825e469d968e0d56886b2094302fdd1d829ca060b8f284233c849ca19ec0d9ae1e8f2158381

                • C:\Users\Admin\eilhtczv.exe

                  Filesize

                  3.6MB

                  MD5

                  5e527a4c1eecf84e4006e74ee48a2d75

                  SHA1

                  9362352dbc2159882cd26276e6fed50f21b9d273

                  SHA256

                  f96a362a61b4515c7d3d9fade1caf4ab5ac87cdff1e0fa6005b57b3c7a2dd4b5

                  SHA512

                  5e3e2eb122526940b721ab6bd105e6ce763c3a0774cd9f3629b7b53972fea225458a03c1f0a24d51e8891fc8143b091712c2800cf6db43b11176d4941255930c

                • C:\Windows\SysWOW64\hehwgsdd\rvcgilbn.exe

                  Filesize

                  1.1MB

                  MD5

                  a0f11dacb563af3253a55c1d29998cbe

                  SHA1

                  ae8f674c3cf05aff1f9bd384b2f8301883d0e033

                  SHA256

                  681e1760e67f195ce0757358b2a3ba7de506f10b8cfa46ba273e1d5e616ade48

                  SHA512

                  9b2572a8346bcc3490fdd89544e780ab8778a079e77644771e3454d17589072b4f5a65d10241f02a38961c88cb11c7f51e942790c6fcb232a4753d29641bf767

                • memory/412-27-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/412-28-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/412-22-0x00000000035A0000-0x00000000036A0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3744-23-0x0000000000540000-0x0000000000555000-memory.dmp

                  Filesize

                  84KB

                • memory/3744-26-0x0000000000540000-0x0000000000555000-memory.dmp

                  Filesize

                  84KB

                • memory/3744-31-0x0000000000540000-0x0000000000555000-memory.dmp

                  Filesize

                  84KB

                • memory/3744-30-0x0000000000540000-0x0000000000555000-memory.dmp

                  Filesize

                  84KB

                • memory/3744-29-0x0000000000540000-0x0000000000555000-memory.dmp

                  Filesize

                  84KB

                • memory/4440-14-0x0000000003390000-0x00000000033A3000-memory.dmp

                  Filesize

                  76KB

                • memory/4440-20-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/4440-13-0x0000000003250000-0x0000000003350000-memory.dmp

                  Filesize

                  1024KB

                • memory/4440-17-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/4776-15-0x00000000032E0000-0x00000000033E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4776-6-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/4776-18-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/4776-4-0x0000000000400000-0x000000000324F000-memory.dmp

                  Filesize

                  46.3MB

                • memory/4776-1-0x00000000032E0000-0x00000000033E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4776-2-0x00000000033E0000-0x00000000033F3000-memory.dmp

                  Filesize

                  76KB