Overview

overview

10

Static

static

3

R4UBC5O.exe

windows7-x64

10

R4UBC5O.exe

windows10-2004-x64

10

Analysis

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

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    11-10-2024 14:24

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General

  • Target

    R4UBC5O.exe

  • Size

    208KB

  • MD5

    40f7ef5677b0ab00743c0a66b2d9c96a

  • SHA1

    a3b64e7d2731a21d9b574ab3f3a804474d5ce3ff

  • SHA256

    eb841ffe2d0c66d018d4d53b6a787a61c405c28def7bed3274814dddf793ae4a

  • SHA512

    9d8fd1de044f8bb399d6b6003abb573ecf00bfc270fa4d2c19f1d97d3dbc040557acf838e4673d5b859817aa9e76d008a5ac999320ee2b0ded409fe7de624689

  • SSDEEP

    3072:wZ4mW1Q1X5y/62wLAebhfcZsPj9w1RBeg8+/yGNV:i4ZA5862w79kZYkRBeA

Score
10/10
tofseediscoveryevasionexecutionpersistenceprivilege_escalationtrojan

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.

    trojantofsee
  • Windows security bypass 2 TTPs 1 IoCs
    evasiontrojan
  • Creates new service(s) 2 TTPs
    persistenceexecution
  • Modifies Windows Firewall 2 TTPs 1 IoCs
    evasion
  • Sets service image path in registry 2 TTPs 1 IoCs
    persistence
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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.

    persistenceprivilege_escalation
  • 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.

    discovery
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe
    "C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3052
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\krfsabrh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2768
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe" C:\Windows\SysWOW64\krfsabrh\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2700
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create krfsabrh binPath= "C:\Windows\SysWOW64\krfsabrh\mygdjwca.exe /d\"C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2680
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description krfsabrh "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2568
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start krfsabrh
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2720
    • 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:2560
  • C:\Windows\SysWOW64\krfsabrh\mygdjwca.exe
    C:\Windows\SysWOW64\krfsabrh\mygdjwca.exe /d"C:\Users\Admin\AppData\Local\Temp\R4UBC5O.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:324
    • 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:1044

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1
T1569

Service Execution

1
T1569.002

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Create or Modify System Process

2
T1543

Windows Service

2
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Defense Evasion

Impair Defenses

2
T1562

Disable or Modify System Firewall

1
T1562.004

Disable or Modify Tools

1
T1562.001

Modify Registry

2
T1112

Credential Access

Discovery

System Information Discovery

1
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\mygdjwca.exe
    Filesize

    12.8MB

    MD5

    59480c4a7f32abc25435a8b55b43f3bc

    SHA1

    804601365fc06096ffaf8366c1d51edf972fd739

    SHA256

    a71c42850d087fb12182904e6229f1c050ef934dacebb0083404ca8308401299

    SHA512

    167c2f8b9a159f31cd9f535fcb2b60268255d7cd5679fd4129841d5e2b65fce8d5a3b750466382a5c6c60bdea47fe8e461357e85bb269d648bd3a4f4f406ca38

    Download Submit

  • memory/324-16-0x0000000000400000-0x0000000000473000-memory.dmp

    Filesize

    460KB

    Download

  • memory/1044-40-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-35-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-54-0x00000000054B0000-0x00000000058BB000-memory.dmp

    Filesize

    4.0MB

    Download

  • memory/1044-43-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-11-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

    Download

  • memory/1044-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

    Download

  • memory/1044-47-0x0000000000230000-0x0000000000235000-memory.dmp

    Filesize

    20KB

    Download

  • memory/1044-17-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

    Download

  • memory/1044-14-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

    Download

  • memory/1044-18-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

    Download

  • memory/1044-20-0x0000000001A00000-0x0000000001C0F000-memory.dmp

    Filesize

    2.1MB

    Download

  • memory/1044-27-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-24-0x0000000000080000-0x0000000000086000-memory.dmp

    Filesize

    24KB

    Download

  • memory/1044-23-0x0000000001A00000-0x0000000001C0F000-memory.dmp

    Filesize

    2.1MB

    Download

  • memory/1044-39-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-38-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-50-0x0000000000230000-0x0000000000235000-memory.dmp

    Filesize

    20KB

    Download

  • memory/1044-51-0x00000000054B0000-0x00000000058BB000-memory.dmp

    Filesize

    4.0MB

    Download

  • memory/1044-55-0x0000000000240000-0x0000000000247000-memory.dmp

    Filesize

    28KB

    Download

  • memory/1044-42-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-41-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-37-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-45-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-46-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-36-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-44-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-34-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-33-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-32-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-31-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/1044-30-0x0000000000220000-0x0000000000230000-memory.dmp

    Filesize

    64KB

    Download

  • memory/3052-2-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

    Download

  • memory/3052-8-0x0000000000400000-0x0000000000473000-memory.dmp

    Filesize

    460KB

    Download

  • memory/3052-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

    Download

  • memory/3052-3-0x0000000000400000-0x0000000000473000-memory.dmp

    Filesize

    460KB

    Download

  • memory/3052-1-0x0000000000630000-0x0000000000730000-memory.dmp

    Filesize

    1024KB

    Download