Analysis

  • max time kernel
    141s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    01-10-2024 11:29

General

  • Target

    102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe

  • Size

    10.2MB

  • MD5

    eb701a894f2e3202f26d9e0199a6d440

  • SHA1

    4f635af1c4e7669ad5522c999bc632d9d4d53a9a

  • SHA256

    102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4

  • SHA512

    d87d3b460fd9948da454df80ecde3b49700760bc15c3f3dc0391875fccec8911b29c7e1c88a31c031d2ed40295adcbee0cbcdde612b1225e3d8f1ccf7f7b6df7

  • SSDEEP

    6144:UDVCynACXFFpI0zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzj:k8vmFFp

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe
    "C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2960
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zstcacxy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2100
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oiiadnrd.exe" C:\Windows\SysWOW64\zstcacxy\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1688
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create zstcacxy binPath= "C:\Windows\SysWOW64\zstcacxy\oiiadnrd.exe /d\"C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1060
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description zstcacxy "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1920
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start zstcacxy
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2796
    • 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:2720
  • C:\Windows\SysWOW64\zstcacxy\oiiadnrd.exe
    C:\Windows\SysWOW64\zstcacxy\oiiadnrd.exe /d"C:\Users\Admin\AppData\Local\Temp\102e9252691dc8857840ffae6582731c2077bff8ac04d054407ba804a058e9c4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2984
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:2772

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    14.6MB

    MD5

    fb9b9d67e1329de4ee4492370eae229e

    SHA1

    f09b4316dc469117d2ff789f106fa722e238e026

    SHA256

    d4e88afb6503819bf749620211d933e49f85fff5fe0765c9dc768b90a9441575

    SHA512

    84046f70e9a0309b52ac505aa722aee45146a08c10e536bc21dd0e15d6157a390ffaf18560807b03847af8c8514e6e6966af75736043a29920a7cfde46a00552

  • memory/2772-3-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2772-6-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2772-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2772-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2772-9-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2772-14-0x00000000019C0000-0x0000000001BCF000-memory.dmp

    Filesize

    2.1MB

  • memory/2772-15-0x0000000000110000-0x0000000000116000-memory.dmp

    Filesize

    24KB

  • memory/2772-18-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-11-0x00000000019C0000-0x0000000001BCF000-memory.dmp

    Filesize

    2.1MB

  • memory/2772-28-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-41-0x0000000000170000-0x0000000000175000-memory.dmp

    Filesize

    20KB

  • memory/2772-38-0x0000000000170000-0x0000000000175000-memory.dmp

    Filesize

    20KB

  • memory/2772-37-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-36-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-35-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-34-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-33-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-32-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-31-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-30-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-29-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-27-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-26-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-25-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-24-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-23-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-22-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-21-0x0000000000120000-0x0000000000130000-memory.dmp

    Filesize

    64KB

  • memory/2772-45-0x0000000005610000-0x0000000005A1B000-memory.dmp

    Filesize

    4.0MB

  • memory/2772-42-0x0000000005610000-0x0000000005A1B000-memory.dmp

    Filesize

    4.0MB

  • memory/2772-46-0x00000000001B0000-0x00000000001B7000-memory.dmp

    Filesize

    28KB