Analysis

  • max time kernel
    150s
  • 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
    05-09-2024 01:34

General

  • Target

    2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe
    "C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yebqwxjt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mykpmsrf.exe" C:\Windows\SysWOW64\yebqwxjt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3488
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yebqwxjt binPath= "C:\Windows\SysWOW64\yebqwxjt\mykpmsrf.exe /d\"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5084
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yebqwxjt "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2240
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yebqwxjt
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3640
    • 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:3328
  • C:\Windows\SysWOW64\yebqwxjt\mykpmsrf.exe
    C:\Windows\SysWOW64\yebqwxjt\mykpmsrf.exe /d"C:\Users\Admin\AppData\Local\Temp\2cccbfbe95b716e6f8b5ed1634b9ae4e6ab87e1355804ca5aea8d353673ff6a2.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4756
    • 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:1180

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.0MB

    MD5

    42ade3a590e500efd32b843d033a73e4

    SHA1

    9421228e2ac0ea1e990a99f705cc4fc3892aedf9

    SHA256

    6c526eae6ec97b59821f408738a9933469f841b51374ac482e640325f289cf93

    SHA512

    a512171055923bbe0490ea06c99a62eab6bd69fc0f0bd6ef439dbfdd9b03d3a2695c0fc9e01fdc8c6949a56cf4a2274f7165983176d2360a2a13920f9b8f15ba

  • memory/1180-48-0x00000000007F0000-0x00000000007F5000-memory.dmp

    Filesize

    20KB

  • memory/1180-27-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-24-0x00000000007D0000-0x00000000007D6000-memory.dmp

    Filesize

    24KB

  • memory/1180-45-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-20-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/1180-23-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/1180-30-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-32-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-46-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-33-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-17-0x00000000003B0000-0x00000000003C5000-memory.dmp

    Filesize

    84KB

  • memory/1180-18-0x00000000003B0000-0x00000000003C5000-memory.dmp

    Filesize

    84KB

  • memory/1180-31-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-55-0x00000000019E0000-0x00000000019E7000-memory.dmp

    Filesize

    28KB

  • memory/1180-54-0x0000000007200000-0x000000000760B000-memory.dmp

    Filesize

    4.0MB

  • memory/1180-51-0x0000000007200000-0x000000000760B000-memory.dmp

    Filesize

    4.0MB

  • memory/1180-50-0x00000000007F0000-0x00000000007F5000-memory.dmp

    Filesize

    20KB

  • memory/1180-34-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-13-0x00000000003B0000-0x00000000003C5000-memory.dmp

    Filesize

    84KB

  • memory/1180-35-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-39-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-43-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-42-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-41-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-40-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-44-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-38-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-37-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/1180-36-0x00000000007E0000-0x00000000007F0000-memory.dmp

    Filesize

    64KB

  • memory/4756-15-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4756-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4756-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4816-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4816-2-0x0000000000780000-0x0000000000793000-memory.dmp

    Filesize

    76KB

  • memory/4816-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4816-8-0x0000000000780000-0x0000000000793000-memory.dmp

    Filesize

    76KB

  • memory/4816-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4816-1-0x0000000000620000-0x0000000000720000-memory.dmp

    Filesize

    1024KB