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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
    04/09/2024, 07:49

General

  • Target

    5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe

  • Size

    191KB

  • MD5

    a8343b36fd866f4ec73184a55aebf791

  • SHA1

    9420445ca0f80f0714978bb158c10772a9eb8ec6

  • SHA256

    5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece

  • SHA512

    9081eb71127efc7dcaf1ba09d0390f71d344533c31c9c259cf495bc7c49c8609c25e4d54612a5becf5267494d035fee5d1e6f7e7a2552bee572f30ac6b4dc515

  • SSDEEP

    3072:7H+lBBpz9/vh9yxrVjljF5xFqeReI7pCpKeJNUWyqpvD3hyNQFFyb1:6Bpz9/vh9yxpBjFzzoK4WWJ9D3IGO

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\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe
    "C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4524
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rnbcgnpo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4672
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lohssbcc.exe" C:\Windows\SysWOW64\rnbcgnpo\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1396
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rnbcgnpo binPath= "C:\Windows\SysWOW64\rnbcgnpo\lohssbcc.exe /d\"C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rnbcgnpo "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1148
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rnbcgnpo
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1932
    • 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:4012
  • C:\Windows\SysWOW64\rnbcgnpo\lohssbcc.exe
    C:\Windows\SysWOW64\rnbcgnpo\lohssbcc.exe /d"C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4564
    • 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:1776

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.7MB

    MD5

    ce768e8e9d08be360b3c19769ac39cc4

    SHA1

    f4e5583d9626843be5e5eac3dfeebbf854ffa92a

    SHA256

    dfc1331f3d4d7c29fbfc6dc1b2dd4a13f7910ca8a0f6966e7f73f9f869f10c06

    SHA512

    51d6a5938b40bb60fe3965838578c195b6b3a64aeb57e59d6f83741aabd713be5785e44ca9b0f983bbb26e4abbce9864bebea6d0944fa61f776bbe7eca982421

  • memory/1776-46-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-52-0x0000000007E40000-0x000000000824B000-memory.dmp

    Filesize

    4.0MB

  • memory/1776-25-0x00000000025E0000-0x00000000025E6000-memory.dmp

    Filesize

    24KB

  • memory/1776-33-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-24-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1776-55-0x0000000007E40000-0x000000000824B000-memory.dmp

    Filesize

    4.0MB

  • memory/1776-31-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-32-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-34-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-14-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1776-18-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1776-35-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-19-0x0000000001270000-0x0000000001285000-memory.dmp

    Filesize

    84KB

  • memory/1776-22-0x0000000002E00000-0x000000000300F000-memory.dmp

    Filesize

    2.1MB

  • memory/1776-28-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-56-0x00000000033E0000-0x00000000033E7000-memory.dmp

    Filesize

    28KB

  • memory/1776-36-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-51-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1776-37-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-48-0x00000000033D0000-0x00000000033D5000-memory.dmp

    Filesize

    20KB

  • memory/1776-43-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-45-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-44-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-47-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-42-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-41-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-40-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-39-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/1776-38-0x00000000025F0000-0x0000000002600000-memory.dmp

    Filesize

    64KB

  • memory/4524-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4524-1-0x00000000005D0000-0x00000000006D0000-memory.dmp

    Filesize

    1024KB

  • memory/4524-7-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/4524-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4524-8-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/4524-2-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/4564-16-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/4564-13-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/4564-11-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/4564-12-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB