Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 16:51

General

  • Target

    UUJycuNA6D.exe

  • Size

    423KB

  • MD5

    b2e864c2f8f6e243822a5c133bb41061

  • SHA1

    5571df4cdc5b65cdc315c95ee52344dda7f12b20

  • SHA256

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2

  • SHA512

    32a6087702abe92daab3e2c194b07006f5b9d3cdf48c692d23775f0d75e2941882920767148564ac7fedc417beadb1ae75734f240d07bec30eb262ae4f534e73

  • SSDEEP

    6144:qc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:q1OZDisvwdaxO0PuG1R4CWs

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\UUJycuNA6D.exe
    "C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4552
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uykbevun\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ayijlhkq.exe" C:\Windows\SysWOW64\uykbevun\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1492
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create uykbevun binPath= "C:\Windows\SysWOW64\uykbevun\ayijlhkq.exe /d\"C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3600
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description uykbevun "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1320
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start uykbevun
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2136
    • 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:3556
  • C:\Windows\SysWOW64\uykbevun\ayijlhkq.exe
    C:\Windows\SysWOW64\uykbevun\ayijlhkq.exe /d"C:\Users\Admin\AppData\Local\Temp\UUJycuNA6D.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4664
    • 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:1664

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.7MB

    MD5

    69c09e2cc9d530598ca307c07afc8000

    SHA1

    09865975fbc536e9892777c07cecc9a46386d762

    SHA256

    7b0fad619f577d823c366cf6c04184f6305f48aa4630afb60d2e4dfb29170324

    SHA512

    4f225b665f185a9662bea681b75dbd5c7de0318e406c47af1ef8113425b3d6cbbb3b5f88af10303e8457435c1de60592f4f5b0854b3a23e87d390573961b9a1e

  • memory/1664-47-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-33-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-38-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-48-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1664-25-0x00000000025E0000-0x00000000025E6000-memory.dmp

    Filesize

    24KB

  • memory/1664-31-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-32-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-34-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-35-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-14-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1664-17-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1664-36-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-19-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1664-46-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-28-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-56-0x00000000033E0000-0x00000000033E7000-memory.dmp

    Filesize

    28KB

  • memory/1664-52-0x0000000007E40000-0x000000000824B000-memory.dmp

    Filesize

    4.0MB

  • memory/1664-51-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1664-24-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1664-55-0x0000000007E40000-0x000000000824B000-memory.dmp

    Filesize

    4.0MB

  • memory/1664-22-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1664-45-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-44-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-43-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-42-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-41-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-40-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-39-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1664-37-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/4552-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4552-2-0x00000000007C0000-0x00000000007D3000-memory.dmp

    Filesize

    76KB

  • memory/4552-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4552-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4552-8-0x00000000007C0000-0x00000000007D3000-memory.dmp

    Filesize

    76KB

  • memory/4552-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

    Filesize

    1024KB

  • memory/4664-18-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4664-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4664-13-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4664-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB