tofsee | 8c65c06a996ac6862230624679911918f188155112aadc288b8453f4f629c6ff

General

Target

3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe
Size

293KB
MD5

e51a053134034365f39714c782c36a93
SHA1

91e470527e6df4a7d90da44c6d56768dae7eb85d
SHA256

3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763
SHA512

4702b88bae5a39d1eefa49d1b2ea6113be5190120791b48d08073804929ee4d1391fbe6eb1191af8f62995c2188219c27f28e35600faeeaf7663397d71e9fd90
SSDEEP

6144:lBapH7MbNv/ALBKBCO4XS2y9EJS6GJIf9I48jVRoM7gn4:Hu7MbloLYAO4XS2y+eo8VRTk4

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

patmushta.info

ovicrush.cn

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Tofsee family
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
4516	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\unamedw\ImagePath = "C:\\Windows\\SysWOW64\\unamedw\\skqrzrsh.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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe

Deletes itself 1 IoCs

pid	Process
3900	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1812	skqrzrsh.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1812 set thread context of 3900	1812	skqrzrsh.exe	100

Launches sc.exe 3 IoCs

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

pid	Process
2924	sc.exe
220	sc.exe
2628	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

Program crash 2 IoCs

pid	pid_target	Process	procid_target
4248	404	WerFault.exe	81
1044	1812	WerFault.exe	94

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	svchost.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	skqrzrsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 404 wrote to memory of 2784	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	82
PID 404 wrote to memory of 2784	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	82
PID 404 wrote to memory of 2784	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	82
PID 404 wrote to memory of 208	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	85
PID 404 wrote to memory of 208	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	85
PID 404 wrote to memory of 208	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	85
PID 404 wrote to memory of 2628	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	87
PID 404 wrote to memory of 2628	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	87
PID 404 wrote to memory of 2628	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	87
PID 404 wrote to memory of 2924	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	89
PID 404 wrote to memory of 2924	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	89
PID 404 wrote to memory of 2924	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	89
PID 404 wrote to memory of 220	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	92
PID 404 wrote to memory of 220	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	92
PID 404 wrote to memory of 220	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	92
PID 404 wrote to memory of 4516	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	95
PID 404 wrote to memory of 4516	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	95
PID 404 wrote to memory of 4516	404	3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe	95
PID 1812 wrote to memory of 3900	1812	skqrzrsh.exe	100
PID 1812 wrote to memory of 3900	1812	skqrzrsh.exe	100
PID 1812 wrote to memory of 3900	1812	skqrzrsh.exe	100
PID 1812 wrote to memory of 3900	1812	skqrzrsh.exe	100
PID 1812 wrote to memory of 3900	1812	skqrzrsh.exe	100

C:\Users\Admin\AppData\Local\Temp\3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe
"C:\Users\Admin\AppData\Local\Temp\3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:404
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\unamedw\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2784
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\skqrzrsh.exe" C:\Windows\SysWOW64\unamedw\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:208
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create unamedw binPath= "C:\Windows\SysWOW64\unamedw\skqrzrsh.exe /d\"C:\Users\Admin\AppData\Local\Temp\3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2628
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description unamedw "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2924
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start unamedw
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:220
- 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:4516
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 404 -s 1044
  2⤵
  - Program crash
  PID:4248

C:\Windows\SysWOW64\unamedw\skqrzrsh.exe
C:\Windows\SysWOW64\unamedw\skqrzrsh.exe /d"C:\Users\Admin\AppData\Local\Temp\3db9a9633bb3097ee7f34cd85bbc168ed3a59496c0c407cf1d22087d58fa2763.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1812
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:3900
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 512
  2⤵
  - Program crash
  PID:1044

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 404 -ip 404
1⤵
PID:2056

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1812 -ip 1812
1⤵
PID:1516

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\skqrzrsh.exe

Filesize
13.7MB

MD5
88e9ed8fcf52f5b6bb0ad903c663af07

SHA1
eec3cad63bebb8af7d449679d45c935d816abf2a

SHA256
4223c9a066640fbc9e3c50f1834483fa99758250d77c0f7da4367cde3b7932ae

SHA512
38292bd26a34fce7722211b6a32482d0a40200f2491d2948262f205d399c01400cc93eb83fd3c8e098eb5f38bed00ad73af3f5ebeeb10c50be7c4f7dfe8bd657

Download Submit
memory/404-14-0x0000000000670000-0x0000000000770000-memory.dmp

Filesize
1024KB

Download
memory/404-2-0x0000000002230000-0x0000000002243000-memory.dmp

Filesize
76KB

Download
memory/404-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/404-19-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/404-1-0x0000000000670000-0x0000000000770000-memory.dmp

Filesize
1024KB

Download
memory/404-18-0x0000000002230000-0x0000000002243000-memory.dmp

Filesize
76KB

Download
memory/404-16-0x0000000000400000-0x00000000004CD000-memory.dmp

Filesize
820KB

Download
memory/1812-20-0x0000000000400000-0x00000000004CD000-memory.dmp

Filesize
820KB

Download
memory/1812-8-0x0000000000400000-0x00000000004CD000-memory.dmp

Filesize
820KB

Download
memory/1812-10-0x0000000000400000-0x00000000004CD000-memory.dmp

Filesize
820KB

Download
memory/1812-9-0x0000000000400000-0x00000000004CD000-memory.dmp

Filesize
820KB

Download
memory/3900-15-0x00000000012A0000-0x00000000012B5000-memory.dmp

Filesize
84KB

Download
memory/3900-11-0x00000000012A0000-0x00000000012B5000-memory.dmp

Filesize
84KB

Download
memory/3900-21-0x00000000012A0000-0x00000000012B5000-memory.dmp

Filesize
84KB

Download
memory/3900-22-0x00000000012A0000-0x00000000012B5000-memory.dmp

Filesize
84KB

Download
memory/3900-23-0x00000000012A0000-0x00000000012B5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads