tofsee | fc8b39e1550508fc277adb212c06b4d858eec204fe9157947fcd8db28296a1d4

General

Target

8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe
Size

14.6MB
MD5

e22e7c6baeebd701b760f4a27a02d8c4
SHA1

1b924330a134a074ecb6f59affde76d6989100c0
SHA256

8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda
SHA512

aa15560cb2fee8ae0c07acc6403f1ec9f33dc63cd6965d5e8af2f645970bb3c0fb7cec48646ddcaaa0fbef010bcdbc0468ea5c78658ea25994d1e1cd80e904e4
SSDEEP

98304:SC+PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPf:x

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
4384	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\xwiwcwzm\ImagePath = "C:\\Windows\\SysWOW64\\xwiwcwzm\\vhointgo.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe

Deletes itself 1 IoCs

pid	Process
4516	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3528	vhointgo.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3528 set thread context of 4516	3528	vhointgo.exe	103

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
2352	sc.exe
3672	sc.exe
4484	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

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

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vhointgo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3752 wrote to memory of 4992	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	86
PID 3752 wrote to memory of 4992	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	86
PID 3752 wrote to memory of 4992	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	86
PID 3752 wrote to memory of 2408	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	88
PID 3752 wrote to memory of 2408	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	88
PID 3752 wrote to memory of 2408	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	88
PID 3752 wrote to memory of 2352	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	90
PID 3752 wrote to memory of 2352	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	90
PID 3752 wrote to memory of 2352	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	90
PID 3752 wrote to memory of 3672	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	92
PID 3752 wrote to memory of 3672	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	92
PID 3752 wrote to memory of 3672	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	92
PID 3752 wrote to memory of 4484	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	94
PID 3752 wrote to memory of 4484	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	94
PID 3752 wrote to memory of 4484	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	94
PID 3752 wrote to memory of 4384	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	99
PID 3752 wrote to memory of 4384	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	99
PID 3752 wrote to memory of 4384	3752	8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe	99
PID 3528 wrote to memory of 4516	3528	vhointgo.exe	103
PID 3528 wrote to memory of 4516	3528	vhointgo.exe	103
PID 3528 wrote to memory of 4516	3528	vhointgo.exe	103
PID 3528 wrote to memory of 4516	3528	vhointgo.exe	103
PID 3528 wrote to memory of 4516	3528	vhointgo.exe	103

C:\Users\Admin\AppData\Local\Temp\8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe
"C:\Users\Admin\AppData\Local\Temp\8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3752
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xwiwcwzm\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4992
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vhointgo.exe" C:\Windows\SysWOW64\xwiwcwzm\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2408
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xwiwcwzm binPath= "C:\Windows\SysWOW64\xwiwcwzm\vhointgo.exe /d\"C:\Users\Admin\AppData\Local\Temp\8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2352
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xwiwcwzm "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3672
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xwiwcwzm
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4484
- 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:4384

C:\Windows\SysWOW64\xwiwcwzm\vhointgo.exe
C:\Windows\SysWOW64\xwiwcwzm\vhointgo.exe /d"C:\Users\Admin\AppData\Local\Temp\8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3528
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4516

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

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\vhointgo.exe

Filesize
14.6MB

MD5
e22e7c6baeebd701b760f4a27a02d8c4

SHA1
1b924330a134a074ecb6f59affde76d6989100c0

SHA256
8f770e85d9789cd77a5ebdf321ae54f5162d4b28c9f929ba4bf109bb770acfda

SHA512
aa15560cb2fee8ae0c07acc6403f1ec9f33dc63cd6965d5e8af2f645970bb3c0fb7cec48646ddcaaa0fbef010bcdbc0468ea5c78658ea25994d1e1cd80e904e4

Download Submit
memory/3528-13-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3528-11-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3528-12-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3528-16-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3752-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/3752-2-0x00000000021F0000-0x0000000002203000-memory.dmp

Filesize
76KB

Download
memory/3752-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/3752-9-0x00000000021F0000-0x0000000002203000-memory.dmp

Filesize
76KB

Download
memory/3752-8-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3752-1-0x0000000000620000-0x0000000000720000-memory.dmp

Filesize
1024KB

Download
memory/4516-14-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/4516-18-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/4516-19-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads