tofsee | 27e3ed0b63c7aaf1cdef8ff971fdf5c60fbf4507ef55343096f94ff6feb5f516

General

Target

0a0dd74c400e848fcf84d1217695746f.exe
Size

313KB
MD5

0a0dd74c400e848fcf84d1217695746f
SHA1

87a35d0bceabe086f8bfb0b286dd678a9c93d35a
SHA256

27e3ed0b63c7aaf1cdef8ff971fdf5c60fbf4507ef55343096f94ff6feb5f516
SHA512

4bb6df5908a505f5d2a1871f86db31ec7883bf4cecd25ad5fcf4c3f7410fbede7487b12dad1e8442b83953510aad074ba04a89f067620c07d0acc89f1973454b
SSDEEP

3072:8pXIEUbI/4pLTdJdBaLh6MbISGRiKT87mk/PGXZuZQ2y5gW5cF3PF1YWUqqT:MNU8ApLTd7BcpbIRR1sjFqpSdtS7

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

1924 netsh.exe

pid	process
1924	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\ytnezaau\ImagePath = "C:\\Windows\\SysWOW64\\ytnezaau\\vlliugwu.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:

0a0dd74c400e848fcf84d1217695746f.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	0a0dd74c400e848fcf84d1217695746f.exe

Executes dropped EXE 1 IoCs

Processes:

vlliugwu.exe

pid process

1008 vlliugwu.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:

vlliugwu.exe

description pid process target process

PID 1008 set thread context of 1300 1008 vlliugwu.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

5116 sc.exe
2024 sc.exe
1508 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

1180 544 WerFault.exe 0a0dd74c400e848fcf84d1217695746f.exe
116 1008 WerFault.exe vlliugwu.exe

pid	process
1008	vlliugwu.exe

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

description	pid	process	target process
PID 1008 set thread context of 1300	1008	vlliugwu.exe	svchost.exe

pid	process
5116	sc.exe
2024	sc.exe
1508	sc.exe

pid	pid_target	process	target process
1180	544	WerFault.exe	0a0dd74c400e848fcf84d1217695746f.exe
116	1008	WerFault.exe	vlliugwu.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:

0a0dd74c400e848fcf84d1217695746f.exevlliugwu.exe

description	pid	process	target process
PID 544 wrote to memory of 1684	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 1684	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 1684	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 4632	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 4632	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 4632	544	0a0dd74c400e848fcf84d1217695746f.exe	cmd.exe
PID 544 wrote to memory of 5116	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 5116	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 5116	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 2024	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 2024	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 2024	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 1508	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 1508	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 1508	544	0a0dd74c400e848fcf84d1217695746f.exe	sc.exe
PID 544 wrote to memory of 1924	544	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 544 wrote to memory of 1924	544	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 544 wrote to memory of 1924	544	0a0dd74c400e848fcf84d1217695746f.exe	netsh.exe
PID 1008 wrote to memory of 1300	1008	vlliugwu.exe	svchost.exe
PID 1008 wrote to memory of 1300	1008	vlliugwu.exe	svchost.exe
PID 1008 wrote to memory of 1300	1008	vlliugwu.exe	svchost.exe
PID 1008 wrote to memory of 1300	1008	vlliugwu.exe	svchost.exe
PID 1008 wrote to memory of 1300	1008	vlliugwu.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe
"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:544

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ytnezaau\
2⤵
PID:1684

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vlliugwu.exe" C:\Windows\SysWOW64\ytnezaau\
2⤵
PID:4632

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ytnezaau binPath= "C:\Windows\SysWOW64\ytnezaau\vlliugwu.exe /d\"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:5116

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ytnezaau "wifi internet conection"
2⤵
- Launches sc.exe
PID:2024

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ytnezaau
2⤵
- Launches sc.exe
PID:1508

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:1924

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 544 -s 632
2⤵
- Program crash
PID:1180

C:\Windows\SysWOW64\ytnezaau\vlliugwu.exe
C:\Windows\SysWOW64\ytnezaau\vlliugwu.exe /d"C:\Users\Admin\AppData\Local\Temp\0a0dd74c400e848fcf84d1217695746f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1008

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:1300

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1008 -s 512
2⤵
- Program crash
PID:116

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 544 -ip 544
1⤵
PID:1080

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1008 -ip 1008
1⤵
PID:1856

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\vlliugwu.exe
Filesize
12.3MB

MD5
54a9d0eda91621e8fc3b95e197adb6de

SHA1
4eb19120f1997e7a0cb8b91ad9deefa9b692ea69

SHA256
402e592c159ea5a1a6d0c60659802a57c5a628cdcf16ea6ddc7930c3d9e51c3c

SHA512
f697ba96eeb8ab63e445f06a3f9da0ef92a79ddfa57c660b2dc98dbb98fea44b6c69f8ad9533feb3f519add3e085b9f7b68333a6ea19e55075e1ae6b025678e1

Download Submit
C:\Windows\SysWOW64\ytnezaau\vlliugwu.exe
Filesize
12.3MB

MD5
54a9d0eda91621e8fc3b95e197adb6de

SHA1
4eb19120f1997e7a0cb8b91ad9deefa9b692ea69

SHA256
402e592c159ea5a1a6d0c60659802a57c5a628cdcf16ea6ddc7930c3d9e51c3c

SHA512
f697ba96eeb8ab63e445f06a3f9da0ef92a79ddfa57c660b2dc98dbb98fea44b6c69f8ad9533feb3f519add3e085b9f7b68333a6ea19e55075e1ae6b025678e1

Download Submit
memory/544-135-0x0000000002420000-0x0000000002433000-memory.dmp

Filesize
76KB

Download
memory/544-139-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/1008-144-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/1300-140-0x0000000000E90000-0x0000000000EA5000-memory.dmp

Filesize
84KB

Download
memory/1300-143-0x0000000000E90000-0x0000000000EA5000-memory.dmp

Filesize
84KB

Download
memory/1300-145-0x0000000000E90000-0x0000000000EA5000-memory.dmp

Filesize
84KB

Download
memory/1300-146-0x0000000000E90000-0x0000000000EA5000-memory.dmp

Filesize
84KB

Download
memory/1300-147-0x0000000000E90000-0x0000000000EA5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads