Analysis

  • max time kernel
    118s
  • max time network
    121s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-10-2024 20:17

General

  • Target

    8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe

  • Size

    71KB

  • MD5

    ea08cac77aa15c1742504a58c8f00180

  • SHA1

    f7b023d2a29ca6c19ed669e0f73c8f5f84dc4379

  • SHA256

    8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ec

  • SHA512

    303bc40c4e06c4479260b42c9ea9b8f38502a0dd3f98de06767762690978d49bdefa12c370151a9338996109f7dea8a2140ae28837b884ed65287f42b0ebefa3

  • SSDEEP

    1536:Dkes21VCy1nTxSYg3CXTjFWL9o5dpIHUc:DDVCyFxSYACXFppI0

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe
    "C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:740
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jchepegd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3756
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ugsxuazn.exe" C:\Windows\SysWOW64\jchepegd\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4628
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create jchepegd binPath= "C:\Windows\SysWOW64\jchepegd\ugsxuazn.exe /d\"C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3916
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description jchepegd "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4624
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start jchepegd
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2792
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:2972
  • C:\Windows\SysWOW64\jchepegd\ugsxuazn.exe
    C:\Windows\SysWOW64\jchepegd\ugsxuazn.exe /d"C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1712
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3464
  • 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 --field-trial-handle=3804,i,3387628439405076340,17957358341235678872,262144 --variations-seed-version --mojo-platform-channel-handle=4220 /prefetch:8
    1⤵
      PID:1652

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      11.2MB

      MD5

      d5df41d1b7970055d059a2f665fa19c3

      SHA1

      a2d60fb07bc0e631a78e890c655d96e4a1505e99

      SHA256

      579eb9807ce96a51a437886d64a9f8a45f1f372ba95c1b01ea1136df3eecf934

      SHA512

      c03d678b67f2b3daf4cd1932185d38da313a4de5983dbf18f92759c66fccaea4940b75878b8d472444d52e7f5800fed3ac08b31936d7d6d9ccbc7ca485dad1db

    • memory/3464-3-0x00000000012D0000-0x00000000012E5000-memory.dmp

      Filesize

      84KB

    • memory/3464-6-0x00000000012D0000-0x00000000012E5000-memory.dmp

      Filesize

      84KB

    • memory/3464-7-0x00000000012D0000-0x00000000012E5000-memory.dmp

      Filesize

      84KB

    • memory/3464-8-0x00000000012D0000-0x00000000012E5000-memory.dmp

      Filesize

      84KB

    • memory/3464-10-0x00000000012D0000-0x00000000012E5000-memory.dmp

      Filesize

      84KB

    • memory/3464-12-0x0000000003000000-0x000000000320F000-memory.dmp

      Filesize

      2.1MB

    • memory/3464-41-0x00000000027E0000-0x00000000027E5000-memory.dmp

      Filesize

      20KB

    • memory/3464-38-0x00000000027E0000-0x00000000027E5000-memory.dmp

      Filesize

      20KB

    • memory/3464-46-0x00000000027F0000-0x00000000027F7000-memory.dmp

      Filesize

      28KB

    • memory/3464-45-0x0000000007F00000-0x000000000830B000-memory.dmp

      Filesize

      4.0MB

    • memory/3464-42-0x0000000007F00000-0x000000000830B000-memory.dmp

      Filesize

      4.0MB

    • memory/3464-37-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-36-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-35-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-34-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-33-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-32-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-31-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-30-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-29-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-28-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-27-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-26-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-25-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-24-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-23-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-22-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-21-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-14-0x0000000003000000-0x000000000320F000-memory.dmp

      Filesize

      2.1MB

    • memory/3464-18-0x0000000002790000-0x00000000027A0000-memory.dmp

      Filesize

      64KB

    • memory/3464-15-0x0000000002780000-0x0000000002786000-memory.dmp

      Filesize

      24KB