Analysis

  • max time kernel
    149s
  • max time network
    158s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    03-09-2024 16:57

General

  • Target

    ybyrikeu.exe

  • Size

    14.6MB

  • MD5

    ca17b0424f909bdc349dc3d80afe6e7f

  • SHA1

    e158fea33819fdbb6c106c1b0a53bff446008c54

  • SHA256

    83dc7a944be536ebd5cdda86381f84235930e36be9fea78504e0a997763ace58

  • SHA512

    f2d7c03b64e2ee0ca64d1b5dc57c2bd4eb44d9b77c9e4e4cce7a6672648b6676f9f78ba5bac79733aa5cdbeb0d6bfbe5064581fd3bf4d8dc5c9b73c795b67906

  • SSDEEP

    6144:kc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:k1OZDisvwdaxO0PuG1R4CWs

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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe
    "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2176
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iqygxxgw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1680
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vpusnqnp.exe" C:\Windows\SysWOW64\iqygxxgw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1596
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create iqygxxgw binPath= "C:\Windows\SysWOW64\iqygxxgw\vpusnqnp.exe /d\"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2968
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description iqygxxgw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2188
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start iqygxxgw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2696
    • 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:2800
  • C:\Windows\SysWOW64\iqygxxgw\vpusnqnp.exe
    C:\Windows\SysWOW64\iqygxxgw\vpusnqnp.exe /d"C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2744
    • 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:2076

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.3MB

    MD5

    fc39726d9eef84abc293dbc7956ae883

    SHA1

    5b5fc78577ee47b790eaa5543354da0ba15cece4

    SHA256

    a12c285f447f9097893b577ac7c92e523a8c05dd5945da93319df88b27a9a441

    SHA512

    1d6f041c805cc1a5cf7cc4be7d06915978835d1380d3cc37c3ca207aa4ce213417858392c9f12f7aab1ed82d1ed54cd76daaf424103f95bd5d2ac4ae9a9ed1bf

  • memory/2076-38-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-51-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB

  • memory/2076-55-0x00000000001F0000-0x00000000001F7000-memory.dmp

    Filesize

    28KB

  • memory/2076-47-0x0000000000170000-0x0000000000175000-memory.dmp

    Filesize

    20KB

  • memory/2076-45-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-14-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2076-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2076-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2076-54-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB

  • memory/2076-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2076-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2076-20-0x0000000001A30000-0x0000000001C3F000-memory.dmp

    Filesize

    2.1MB

  • memory/2076-27-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-24-0x00000000000A0000-0x00000000000A6000-memory.dmp

    Filesize

    24KB

  • memory/2076-23-0x0000000001A30000-0x0000000001C3F000-memory.dmp

    Filesize

    2.1MB

  • memory/2076-37-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-46-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-50-0x0000000000170000-0x0000000000175000-memory.dmp

    Filesize

    20KB

  • memory/2076-30-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-35-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-43-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-44-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-42-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-41-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-40-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-39-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-36-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-34-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-33-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-32-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2076-31-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2176-2-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2176-4-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2176-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2176-8-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2176-1-0x0000000000790000-0x0000000000890000-memory.dmp

    Filesize

    1024KB

  • memory/2744-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB