tofsee | 3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363

General

Target

rXTqHar5Ud.exe
Size

397KB
MD5

f403202fb853377ceb67200005ef95b8
SHA1

1840e1495486209e92e5230cf1406f31a02699e7
SHA256

3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363
SHA512

13b130d6f2ac8be444e16d4b1116812179d5043912a7aa24bd0d566eeecf4447be09fd54266dc12ff1902569d048c93a2d0c827abc135b0159f8156c18f9bf7a
SSDEEP

6144:7BYOcLH6/xNtFxaS3DpwmEIey0bGWEbje2bkln5eOy8:76Ocb6/r/xv2GWaeaklQT8

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

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.
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

Processes:

netsh.exe

pid process

4824 netsh.exe

pid	process
4824	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\sextvumg\ImagePath = "C:\\Windows\\SysWOW64\\sextvumg\\amurxkqo.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

Processes:

rXTqHar5Ud.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	rXTqHar5Ud.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2120 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

amurxkqo.exe

pid process

432 amurxkqo.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

amurxkqo.exe

description pid process target process

PID 432 set thread context of 2120 432 amurxkqo.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

3260 sc.exe
3148 sc.exe
3244 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2120	svchost.exe

pid	process
432	amurxkqo.exe

description	pid	process	target process
PID 432 set thread context of 2120	432	amurxkqo.exe	svchost.exe

pid	process
3260	sc.exe
3148	sc.exe
3244	sc.exe

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

Processes:

netsh.exe

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

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

5040 4112 WerFault.exe rXTqHar5Ud.exe
3152 432 WerFault.exe amurxkqo.exe

pid	pid_target	process	target process
5040	4112	WerFault.exe	rXTqHar5Ud.exe
3152	432	WerFault.exe	amurxkqo.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

Processes:

rXTqHar5Ud.exesc.exenetsh.exeamurxkqo.exesvchost.execmd.execmd.exesc.exesc.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rXTqHar5Ud.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	amurxkqo.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

rXTqHar5Ud.exeamurxkqo.exe

description	pid	process	target process
PID 4112 wrote to memory of 1688	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 1688	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 1688	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 5104	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 5104	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 5104	4112	rXTqHar5Ud.exe	cmd.exe
PID 4112 wrote to memory of 3260	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3260	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3260	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3148	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3148	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3148	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3244	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3244	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 3244	4112	rXTqHar5Ud.exe	sc.exe
PID 4112 wrote to memory of 4824	4112	rXTqHar5Ud.exe	netsh.exe
PID 4112 wrote to memory of 4824	4112	rXTqHar5Ud.exe	netsh.exe
PID 4112 wrote to memory of 4824	4112	rXTqHar5Ud.exe	netsh.exe
PID 432 wrote to memory of 2120	432	amurxkqo.exe	svchost.exe
PID 432 wrote to memory of 2120	432	amurxkqo.exe	svchost.exe
PID 432 wrote to memory of 2120	432	amurxkqo.exe	svchost.exe
PID 432 wrote to memory of 2120	432	amurxkqo.exe	svchost.exe
PID 432 wrote to memory of 2120	432	amurxkqo.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe
"C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4112
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sextvumg\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1688
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\amurxkqo.exe" C:\Windows\SysWOW64\sextvumg\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5104
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create sextvumg binPath= "C:\Windows\SysWOW64\sextvumg\amurxkqo.exe /d\"C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3260
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description sextvumg "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3148
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start sextvumg
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3244
- 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:4824
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4112 -s 660
  2⤵
  - Program crash
  PID:5040

C:\Windows\SysWOW64\sextvumg\amurxkqo.exe
C:\Windows\SysWOW64\sextvumg\amurxkqo.exe /d"C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:432
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2120
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 432 -s 516
  2⤵
  - Program crash
  PID:3152

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4112 -ip 4112
1⤵
PID:4948

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 432 -ip 432
1⤵
PID:2324

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\amurxkqo.exe

Filesize
14.6MB

MD5
37d99ae95fc0e9efb2c56cbff4c63191

SHA1
b6ac2247ec104410baff76740b9fb0d0cd26cc20

SHA256
1a1e6e1d964dc8ca841f7614fdeab8086511b7b0c921db9eb996e24f205b39ed

SHA512
a93bfdd9f059cf891e91c389d8c31b99a10bbc9e385765a39be95664e7b68f547d38b31c2b66318c02c34773a94fb195b53989b34c97846878c9c21c0cd39f6e

Download Submit
memory/432-15-0x0000000000400000-0x000000000247B000-memory.dmp

Filesize
32.5MB

Download
memory/2120-11-0x0000000000BD0000-0x0000000000BE5000-memory.dmp

Filesize
84KB

Download
memory/2120-13-0x0000000000BD0000-0x0000000000BE5000-memory.dmp

Filesize
84KB

Download
memory/2120-14-0x0000000000BD0000-0x0000000000BE5000-memory.dmp

Filesize
84KB

Download
memory/4112-1-0x0000000002510000-0x0000000002610000-memory.dmp

Filesize
1024KB

Download
memory/4112-2-0x00000000041C0000-0x00000000041D3000-memory.dmp

Filesize
76KB

Download
memory/4112-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4112-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4112-8-0x00000000041C0000-0x00000000041D3000-memory.dmp

Filesize
76KB

Download
memory/4112-7-0x0000000000400000-0x000000000247B000-memory.dmp

Filesize
32.5MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads