tofsee | e54e9f7fe7725afa85dfe0d0e04cf873d01084989205d93b4b4e1e1de7d935f3

General

Target

file.exe
Size

315KB
MD5

1e93be0d225ce928393039c9771321fb
SHA1

27ffe470bee42d5ce14f3914bc710f68fbd74247
SHA256

e54e9f7fe7725afa85dfe0d0e04cf873d01084989205d93b4b4e1e1de7d935f3
SHA512

3d51ef74913c2266f88a2b734ecb058caa390e3f72fb7aa47e7c5ea3565ef832394a0854c3aa84208143fb005d3d506a46465749b56d80aecee9755c5f8d378c
SSDEEP

3072:TNXD1CpI7TkxlIlY0I0n+sDiV6YtnEduisT58ThH8x/06j0eO/OfgaH9xWm+d/HO:hEpjXQYhIs6YtnEduisN8F81069lH9A

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

4004 netsh.exe

pid	process
4004	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\ayoxcuaq\ImagePath = "C:\\Windows\\SysWOW64\\ayoxcuaq\\seuhvumq.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-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

seuhvumq.exe

pid process

4272 seuhvumq.exe
Drops file in System32 directory 2 IoCs

Processes:

seuhvumq.exesvchost.exe

description ioc process

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

Processes:

seuhvumq.exe

description pid process target process

PID 4272 set thread context of 2336 4272 seuhvumq.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

224 sc.exe
1576 sc.exe
1000 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
4272	seuhvumq.exe

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

description	pid	process	target process
PID 4272 set thread context of 2336	4272	seuhvumq.exe	svchost.exe

pid	process
224	sc.exe
1576	sc.exe
1000	sc.exe

Program crash 4 IoCs

Processes:

WerFault.exeWerFault.exeWerFault.exeWerFault.exe

pid	pid_target	process	target process
3936	2088	WerFault.exe	file.exe
2000	2088	WerFault.exe	file.exe
3068	2088	WerFault.exe	file.exe
1936	4272	WerFault.exe	seuhvumq.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.exeseuhvumq.exe

description	pid	process	target process
PID 2088 wrote to memory of 3716	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 3716	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 3716	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 4596	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 4596	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 4596	2088	file.exe	cmd.exe
PID 2088 wrote to memory of 1000	2088	file.exe	sc.exe
PID 2088 wrote to memory of 1000	2088	file.exe	sc.exe
PID 2088 wrote to memory of 1000	2088	file.exe	sc.exe
PID 2088 wrote to memory of 224	2088	file.exe	sc.exe
PID 2088 wrote to memory of 224	2088	file.exe	sc.exe
PID 2088 wrote to memory of 224	2088	file.exe	sc.exe
PID 2088 wrote to memory of 1576	2088	file.exe	sc.exe
PID 2088 wrote to memory of 1576	2088	file.exe	sc.exe
PID 2088 wrote to memory of 1576	2088	file.exe	sc.exe
PID 2088 wrote to memory of 4004	2088	file.exe	netsh.exe
PID 2088 wrote to memory of 4004	2088	file.exe	netsh.exe
PID 2088 wrote to memory of 4004	2088	file.exe	netsh.exe
PID 4272 wrote to memory of 2336	4272	seuhvumq.exe	svchost.exe
PID 4272 wrote to memory of 2336	4272	seuhvumq.exe	svchost.exe
PID 4272 wrote to memory of 2336	4272	seuhvumq.exe	svchost.exe
PID 4272 wrote to memory of 2336	4272	seuhvumq.exe	svchost.exe
PID 4272 wrote to memory of 2336	4272	seuhvumq.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:2088

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ayoxcuaq\
2⤵
PID:3716

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\seuhvumq.exe" C:\Windows\SysWOW64\ayoxcuaq\
2⤵
PID:4596

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ayoxcuaq binPath= "C:\Windows\SysWOW64\ayoxcuaq\seuhvumq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1000

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ayoxcuaq "wifi internet conection"
2⤵
- Launches sc.exe
PID:224

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ayoxcuaq
2⤵
- Launches sc.exe
PID:1576

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:4004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 1276
2⤵
- Program crash
PID:3936

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 1244
2⤵
- Program crash
PID:2000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 1232
2⤵
- Program crash
PID:3068

C:\Windows\SysWOW64\ayoxcuaq\seuhvumq.exe
C:\Windows\SysWOW64\ayoxcuaq\seuhvumq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4272

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:2336

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4272 -s 532
2⤵
- Program crash
PID:1936

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2088 -ip 2088
1⤵
PID:4752

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2088 -ip 2088
1⤵
PID:2368

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 2088 -ip 2088
1⤵
PID:4904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 4272 -ip 4272
1⤵
PID:4456

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\seuhvumq.exe
Filesize
11.8MB

MD5
db8d489804f863f348812914856b4421

SHA1
5b0e3489a060a9f7ee0f53fab5201c46ccbb14de

SHA256
2b0d10b0cca354cb6dcb74592882fb1a780d8c3e125370a2e579e57b1c7c3bd2

SHA512
8fc37778e9e2102d37f87ce94aa8cc488d76f612c5f45eb888c7866da48dab81f5e249076d75a86733e2bd827fbf06681008c1626a23efc8381e6a6d98e29a4c

Download Submit
C:\Windows\SysWOW64\ayoxcuaq\seuhvumq.exe
Filesize
11.8MB

MD5
db8d489804f863f348812914856b4421

SHA1
5b0e3489a060a9f7ee0f53fab5201c46ccbb14de

SHA256
2b0d10b0cca354cb6dcb74592882fb1a780d8c3e125370a2e579e57b1c7c3bd2

SHA512
8fc37778e9e2102d37f87ce94aa8cc488d76f612c5f45eb888c7866da48dab81f5e249076d75a86733e2bd827fbf06681008c1626a23efc8381e6a6d98e29a4c

Download Submit
memory/2088-135-0x0000000000820000-0x0000000000833000-memory.dmp

Filesize
76KB

Download
memory/2088-138-0x0000000000400000-0x00000000006CC000-memory.dmp

Filesize
2.8MB

Download
memory/2336-140-0x0000000001030000-0x0000000001045000-memory.dmp

Filesize
84KB

Download
memory/2336-143-0x0000000001030000-0x0000000001045000-memory.dmp

Filesize
84KB

Download
memory/2336-145-0x0000000001030000-0x0000000001045000-memory.dmp

Filesize
84KB

Download
memory/2336-146-0x0000000001030000-0x0000000001045000-memory.dmp

Filesize
84KB

Download
memory/2336-148-0x0000000001030000-0x0000000001045000-memory.dmp

Filesize
84KB

Download
memory/4272-144-0x0000000000400000-0x00000000006CC000-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