tofsee | 63e235b92d97d6c3d5a5dca42f31279b674d3140affc1e26c5971d12fc1d7667

General

Target

file.exe
Size

298KB
MD5

b7c137a18093f43fa0ac50865cc34f9c
SHA1

93727de39d92f6934d4ddee26728b207a212428e
SHA256

63e235b92d97d6c3d5a5dca42f31279b674d3140affc1e26c5971d12fc1d7667
SHA512

40683347b6f3dd2f18d15d5bfaa64d98f6ca88d1497bac811483366c59e5c786914dd32445981f774666b20053390f18d5a01f278162ba85bf75866edf6c95d6
SSDEEP

3072:/UgGk8D2CKiH+U3XmE5kDOXkqVDE/zpUp+rqdyy76kgREiwUP7A6qVxWm5iT/Hrq:Ret/X/GDwpELm04B710Ej2qVA8i

Score

10^/10

tofsee evasion persistence 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) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4156 netsh.exe

pid	process
4156	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

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

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

xnnkwiyw.exe

pid process

3860 xnnkwiyw.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

xnnkwiyw.exe

description pid process target process

PID 3860 set thread context of 432 3860 xnnkwiyw.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

4784 sc.exe
4028 sc.exe
4360 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

4272 3272 WerFault.exe file.exe
3624 3860 WerFault.exe xnnkwiyw.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
3860	xnnkwiyw.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 3860 set thread context of 432	3860	xnnkwiyw.exe	svchost.exe

pid	process
4784	sc.exe
4028	sc.exe
4360	sc.exe

pid	pid_target	process	target process
4272	3272	WerFault.exe	file.exe
3624	3860	WerFault.exe	xnnkwiyw.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exexnnkwiyw.exe

description	pid	process	target process
PID 3272 wrote to memory of 500	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 500	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 500	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 3340	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 3340	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 3340	3272	file.exe	cmd.exe
PID 3272 wrote to memory of 4784	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4784	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4784	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4028	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4028	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4028	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4360	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4360	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4360	3272	file.exe	sc.exe
PID 3272 wrote to memory of 4156	3272	file.exe	netsh.exe
PID 3272 wrote to memory of 4156	3272	file.exe	netsh.exe
PID 3272 wrote to memory of 4156	3272	file.exe	netsh.exe
PID 3860 wrote to memory of 432	3860	xnnkwiyw.exe	svchost.exe
PID 3860 wrote to memory of 432	3860	xnnkwiyw.exe	svchost.exe
PID 3860 wrote to memory of 432	3860	xnnkwiyw.exe	svchost.exe
PID 3860 wrote to memory of 432	3860	xnnkwiyw.exe	svchost.exe
PID 3860 wrote to memory of 432	3860	xnnkwiyw.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3272

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rqjjioag\
2⤵
PID:500

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe" C:\Windows\SysWOW64\rqjjioag\
2⤵
PID:3340

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create rqjjioag binPath= "C:\Windows\SysWOW64\rqjjioag\xnnkwiyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4784

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description rqjjioag "wifi internet conection"
2⤵
- Launches sc.exe
PID:4028

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start rqjjioag
2⤵
- Launches sc.exe
PID:4360

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
PID:4156

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3272 -s 1040
2⤵
- Program crash
PID:4272

C:\Windows\SysWOW64\rqjjioag\xnnkwiyw.exe
C:\Windows\SysWOW64\rqjjioag\xnnkwiyw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3860

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:432

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3860 -s 516
2⤵
- Program crash
PID:3624

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3272 -ip 3272
1⤵
PID:5096

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3860 -ip 3860
1⤵
PID:1448

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe
Filesize
14.3MB

MD5
bb52d06bca9c70a8ebecc9d3bb56b3f3

SHA1
99c38beb42f48d9b90b43ea747ef2a6a49531423

SHA256
6f8b0c9014900028cfcd1ad7d767c7a8730bd5303bcb02a4ad4bd8845856ec32

SHA512
cfcd1f4eba86dca568330497ed4deee62adbbe6d3f2d5046fa468f96f37771c7c175759313b30af6423e28a66604b02293f3dbab477e107e1073e41ec501e9b2

Download Submit
C:\Windows\SysWOW64\rqjjioag\xnnkwiyw.exe
Filesize
14.3MB

MD5
bb52d06bca9c70a8ebecc9d3bb56b3f3

SHA1
99c38beb42f48d9b90b43ea747ef2a6a49531423

SHA256
6f8b0c9014900028cfcd1ad7d767c7a8730bd5303bcb02a4ad4bd8845856ec32

SHA512
cfcd1f4eba86dca568330497ed4deee62adbbe6d3f2d5046fa468f96f37771c7c175759313b30af6423e28a66604b02293f3dbab477e107e1073e41ec501e9b2

Download Submit
memory/432-140-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

Filesize
84KB

Download
memory/432-143-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

Filesize
84KB

Download
memory/432-145-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

Filesize
84KB

Download
memory/432-146-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

Filesize
84KB

Download
memory/432-147-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

Filesize
84KB

Download
memory/3272-134-0x0000000000820000-0x0000000000833000-memory.dmp

Filesize
76KB

Download
memory/3272-138-0x0000000000400000-0x00000000006C8000-memory.dmp

Filesize
2.8MB

Download
memory/3860-144-0x0000000000400000-0x00000000006C8000-memory.dmp

Filesize
2.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads