Overview

overview

10

Static

static

10

50755e3eb1...a8.exe

windows7-x64

10

50755e3eb1...a8.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    11-09-2024 12:46

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General

  • Target

    50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe

  • Size

    13.2MB

  • MD5

    5c22dd0023f2924fd7804a0ddbf7ae78

  • SHA1

    280c5a888f5e30d0858b809611c47308b4e8bab4

  • SHA256

    50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8

  • SHA512

    437e049e5ba7477b857b57f56f038f1f7d33e9edc78a5ac853eec6604aabe1eea801e45d4b9655aac230e5885a3a1e920d1b2d6409a215934f2768d0e167e254

  • SSDEEP

    6144:UDVCynACXF+pI0zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzP:k8vmF+p

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
  • 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 5 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe
    "C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2152
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yifvcmon\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vyrcclmm.exe" C:\Windows\SysWOW64\yifvcmon\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2860
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yifvcmon binPath= "C:\Windows\SysWOW64\yifvcmon\vyrcclmm.exe /d\"C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2180
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yifvcmon "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2356
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yifvcmon
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2360
    • 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:2828
  • C:\Windows\SysWOW64\yifvcmon\vyrcclmm.exe
    C:\Windows\SysWOW64\yifvcmon\vyrcclmm.exe /d"C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2740
    • 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:2848

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\vyrcclmm.exe
    Filesize

    12.2MB

    MD5

    368f498268888b7e1afa098e75670969

    SHA1

    08d6df926f8ec27e470f499a9440b229934e11c6

    SHA256

    472a73595797533351af76bc96cf39ed0bbd5e19edac36d7e6f96ebb831f74b4

    SHA512

    c95701d2a296ae0152b7b7fe9da92ab0546c1eb3e7158981227dbbbf89045727c515faaed7bea924ce7f1b64d8d1675b94110bc3ac426b3f054efeb00c7349a0

    Download Submit

  • memory/2848-6-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

    Download

  • memory/2848-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

    Download

  • memory/2848-3-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

    Download

  • memory/2848-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

    Download

  • memory/2848-9-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

    Download

  • memory/2848-11-0x0000000001BD0000-0x0000000001DDF000-memory.dmp

    Filesize

    2.1MB

    Download

  • memory/2848-18-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-15-0x00000000001A0000-0x00000000001A6000-memory.dmp

    Filesize

    24KB

    Download

  • memory/2848-14-0x0000000001BD0000-0x0000000001DDF000-memory.dmp

    Filesize

    2.1MB

    Download

  • memory/2848-31-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-34-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-46-0x0000000000310000-0x0000000000317000-memory.dmp

    Filesize

    28KB

    Download

  • memory/2848-42-0x0000000005770000-0x0000000005B7B000-memory.dmp

    Filesize

    4.0MB

    Download

  • memory/2848-41-0x0000000000240000-0x0000000000245000-memory.dmp

    Filesize

    20KB

    Download

  • memory/2848-38-0x0000000000240000-0x0000000000245000-memory.dmp

    Filesize

    20KB

    Download

  • memory/2848-37-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-36-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-35-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-33-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-32-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-30-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-29-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-28-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-27-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-45-0x0000000005770000-0x0000000005B7B000-memory.dmp

    Filesize

    4.0MB

    Download

  • memory/2848-26-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-25-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-24-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-23-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-22-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download

  • memory/2848-21-0x00000000001B0000-0x00000000001C0000-memory.dmp

    Filesize

    64KB

    Download