Analysis

  • max time kernel
    157s
  • max time network
    168s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:48

General

  • Target

    6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe

  • Size

    170KB

  • MD5

    f5fd4237e550503a8eab51ae35f147b6

  • SHA1

    869d44d58fb734b3692500dae1f42f0d6e3b3434

  • SHA256

    6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd

  • SHA512

    32327ca44e09d46ba8e656124f7480979b3eeb3769a94259d536a5223b2c532bd21654d8b4551d26265903f5c2be87a8da73d4571eee6fd9bfc887ea9e88350f

  • SSDEEP

    1536:Js5KSNeteSXSI4nZ7OyP8p7+C1xIhQ6M3dfUMJn325pDedDT50ZXXKVXRKX:e5ScSHCO1p7hiO4AI1edHK56lR

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

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 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
    "C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jddxtytz\
      2⤵
        PID:696
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ubilaohr.exe" C:\Windows\SysWOW64\jddxtytz\
        2⤵
          PID:2384
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jddxtytz binPath= "C:\Windows\SysWOW64\jddxtytz\ubilaohr.exe /d\"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4996
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jddxtytz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3648
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jddxtytz
          2⤵
          • Launches sc.exe
          PID:3356
        • 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:4524
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3968 -s 1264
          2⤵
          • Program crash
          PID:2284
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3968 -ip 3968
        1⤵
          PID:3236
        • C:\Windows\SysWOW64\jddxtytz\ubilaohr.exe
          C:\Windows\SysWOW64\jddxtytz\ubilaohr.exe /d"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4900
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Deletes itself
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:1516
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4900 -s 508
            2⤵
            • Program crash
            PID:1376
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 4900 -ip 4900
          1⤵
            PID:1136
          • 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=4120 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:4684

            Network

            MITRE ATT&CK Matrix ATT&CK v13

            Persistence

            Create or Modify System Process

            2
            T1543

            Windows Service

            2
            T1543.003

            Boot or Logon Autostart Execution

            1
            T1547

            Registry Run Keys / Startup Folder

            1
            T1547.001

            Privilege Escalation

            Create or Modify System Process

            2
            T1543

            Windows Service

            2
            T1543.003

            Boot or Logon Autostart Execution

            1
            T1547

            Registry Run Keys / Startup Folder

            1
            T1547.001

            Defense Evasion

            Impair Defenses

            1
            T1562

            Disable or Modify System Firewall

            1
            T1562.004

            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\ubilaohr.exe
              Filesize

              12.6MB

              MD5

              642e7ed264d3778138558a98df3f3344

              SHA1

              7dfccf9455b657d930745e2706c63c053b4726bc

              SHA256

              4c4253449d3ec4817ba863311194ba14c033d785787a6562591b0c783b87e756

              SHA512

              c15d3134dacd168ecda34311e9777d789081b2c986744edf5d892bad76ce9ba6e51af7aa42ab98218fd4ff2e4e0829d88752ab4478e173bffd6a26e37fe99ebe

            • memory/1516-34-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-46-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-59-0x00000000039F0000-0x00000000039F7000-memory.dmp
              Filesize

              28KB

            • memory/1516-36-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-58-0x0000000008400000-0x000000000880B000-memory.dmp
              Filesize

              4.0MB

            • memory/1516-37-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-55-0x0000000008400000-0x000000000880B000-memory.dmp
              Filesize

              4.0MB

            • memory/1516-35-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-54-0x00000000039E0000-0x00000000039E5000-memory.dmp
              Filesize

              20KB

            • memory/1516-15-0x0000000000FA0000-0x0000000000FB5000-memory.dmp
              Filesize

              84KB

            • memory/1516-19-0x0000000000FA0000-0x0000000000FB5000-memory.dmp
              Filesize

              84KB

            • memory/1516-18-0x0000000000FA0000-0x0000000000FB5000-memory.dmp
              Filesize

              84KB

            • memory/1516-51-0x00000000039E0000-0x00000000039E5000-memory.dmp
              Filesize

              20KB

            • memory/1516-21-0x0000000000FA0000-0x0000000000FB5000-memory.dmp
              Filesize

              84KB

            • memory/1516-23-0x0000000000FA0000-0x0000000000FB5000-memory.dmp
              Filesize

              84KB

            • memory/1516-24-0x0000000003000000-0x000000000320F000-memory.dmp
              Filesize

              2.1MB

            • memory/1516-27-0x0000000003000000-0x000000000320F000-memory.dmp
              Filesize

              2.1MB

            • memory/1516-28-0x00000000025D0000-0x00000000025D6000-memory.dmp
              Filesize

              24KB

            • memory/1516-31-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-47-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-49-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-48-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-50-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-38-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-39-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-40-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-42-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-41-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-43-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-44-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/1516-45-0x00000000025E0000-0x00000000025F0000-memory.dmp
              Filesize

              64KB

            • memory/3968-3-0x0000000000400000-0x0000000000474000-memory.dmp
              Filesize

              464KB

            • memory/3968-10-0x0000000000400000-0x0000000000474000-memory.dmp
              Filesize

              464KB

            • memory/3968-2-0x00000000005F0000-0x0000000000603000-memory.dmp
              Filesize

              76KB

            • memory/3968-1-0x0000000000680000-0x0000000000780000-memory.dmp
              Filesize

              1024KB

            • memory/3968-11-0x00000000005F0000-0x0000000000603000-memory.dmp
              Filesize

              76KB

            • memory/3968-8-0x0000000000680000-0x0000000000780000-memory.dmp
              Filesize

              1024KB

            • memory/3968-5-0x0000000000400000-0x0000000000474000-memory.dmp
              Filesize

              464KB

            • memory/4900-13-0x0000000000610000-0x0000000000710000-memory.dmp
              Filesize

              1024KB

            • memory/4900-20-0x0000000000400000-0x0000000000474000-memory.dmp
              Filesize

              464KB

            • memory/4900-14-0x0000000000400000-0x0000000000474000-memory.dmp
              Filesize

              464KB