tofsee | ddeaca50e21813ebb8ee743cca315e0f1d7a05900d4369b652f68f5baeaa6f38

General

Target

file.exe
Size

167KB
MD5

068af12a4fde5998014522a0e8eaeb06
SHA1

e51abb1d6ef5a889b398a670c60f20cec46f7f95
SHA256

ddeaca50e21813ebb8ee743cca315e0f1d7a05900d4369b652f68f5baeaa6f38
SHA512

9b931733b2b6a478d639aa5cca89e36fe37d3a225277e985ae845a8362bd14186e59f879435ecd3a975010df752c9e8e9c8cedf62a760c87246383e22bdad71c
SSDEEP

3072:zBl9IavvucboHS5J1VQErTHNXrDDJkbV5vw:h/HLboi/QEPVDlkB

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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
Executes dropped EXE 1 IoCs

Processes:

ztvdztzs.exe

pid process

2324 ztvdztzs.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1460 netsh.exe

pid	process
2324	ztvdztzs.exe

pid	process
1460	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\srhfwlh\ImagePath = "C:\\Windows\\SysWOW64\\srhfwlh\\ztvdztzs.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ztvdztzs.exe

description pid process target process

PID 2324 set thread context of 3356 2324 ztvdztzs.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

1204 sc.exe
932 sc.exe
1560 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

1900 4284 WerFault.exe file.exe
3824 2324 WerFault.exe ztvdztzs.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 2324 set thread context of 3356	2324	ztvdztzs.exe	svchost.exe

pid	process
1204	sc.exe
932	sc.exe
1560	sc.exe

pid	pid_target	process	target process
1900	4284	WerFault.exe	file.exe
3824	2324	WerFault.exe	ztvdztzs.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exeztvdztzs.exe

description	pid	process	target process
PID 4284 wrote to memory of 4824	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 4824	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 4824	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 1528	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 1528	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 1528	4284	file.exe	cmd.exe
PID 4284 wrote to memory of 1204	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1204	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1204	4284	file.exe	sc.exe
PID 4284 wrote to memory of 932	4284	file.exe	sc.exe
PID 4284 wrote to memory of 932	4284	file.exe	sc.exe
PID 4284 wrote to memory of 932	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1560	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1560	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1560	4284	file.exe	sc.exe
PID 4284 wrote to memory of 1460	4284	file.exe	netsh.exe
PID 4284 wrote to memory of 1460	4284	file.exe	netsh.exe
PID 4284 wrote to memory of 1460	4284	file.exe	netsh.exe
PID 2324 wrote to memory of 3356	2324	ztvdztzs.exe	svchost.exe
PID 2324 wrote to memory of 3356	2324	ztvdztzs.exe	svchost.exe
PID 2324 wrote to memory of 3356	2324	ztvdztzs.exe	svchost.exe
PID 2324 wrote to memory of 3356	2324	ztvdztzs.exe	svchost.exe
PID 2324 wrote to memory of 3356	2324	ztvdztzs.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:4284

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\srhfwlh\
2⤵
PID:4824

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ztvdztzs.exe" C:\Windows\SysWOW64\srhfwlh\
2⤵
PID:1528

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create srhfwlh binPath= "C:\Windows\SysWOW64\srhfwlh\ztvdztzs.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1204

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description srhfwlh "wifi internet conection"
2⤵
- Launches sc.exe
PID:932

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start srhfwlh
2⤵
- Launches sc.exe
PID:1560

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:1460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4284 -s 1036
2⤵
- Program crash
PID:1900

C:\Windows\SysWOW64\srhfwlh\ztvdztzs.exe
C:\Windows\SysWOW64\srhfwlh\ztvdztzs.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2324

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:3356

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2324 -s 520
2⤵
- Program crash
PID:3824

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4284 -ip 4284
1⤵
PID:3552

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 2324 -ip 2324
1⤵
PID:2148

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ztvdztzs.exe
Filesize
11.6MB

MD5
e8be4ee264223fe4aedc07152d208d68

SHA1
230b7f6f5e8353d381917f23707c46259c08c799

SHA256
93a6fd7f9087de51f65e9026824639dfd11ecfe8a78fd6990e11740fe94b7080

SHA512
1f408375baebcf2035ece225ab7ea38207f572979e0fe8677f9f1949c356124f01339082a5fbc87ca86e137b7b9029c956116cf79aeb4eb255780b4000b2bca6

Download Submit
C:\Windows\SysWOW64\srhfwlh\ztvdztzs.exe
Filesize
11.6MB

MD5
e8be4ee264223fe4aedc07152d208d68

SHA1
230b7f6f5e8353d381917f23707c46259c08c799

SHA256
93a6fd7f9087de51f65e9026824639dfd11ecfe8a78fd6990e11740fe94b7080

SHA512
1f408375baebcf2035ece225ab7ea38207f572979e0fe8677f9f1949c356124f01339082a5fbc87ca86e137b7b9029c956116cf79aeb4eb255780b4000b2bca6

Download Submit
memory/932-140-0x0000000000000000-mapping.dmp

Download
memory/1204-139-0x0000000000000000-mapping.dmp

Download
memory/1460-143-0x0000000000000000-mapping.dmp

Download
memory/1528-137-0x0000000000000000-mapping.dmp

Download
memory/1560-141-0x0000000000000000-mapping.dmp

Download
memory/2324-151-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/2324-150-0x0000000000938000-0x0000000000948000-memory.dmp

Filesize
64KB

Download
memory/3356-147-0x0000000000920000-0x0000000000935000-memory.dmp

Filesize
84KB

Download
memory/3356-146-0x0000000000000000-mapping.dmp

Download
memory/3356-152-0x0000000000920000-0x0000000000935000-memory.dmp

Filesize
84KB

Download
memory/3356-153-0x0000000000920000-0x0000000000935000-memory.dmp

Filesize
84KB

Download
memory/4284-133-0x0000000002450000-0x0000000002463000-memory.dmp

Filesize
76KB

Download
memory/4284-144-0x0000000002450000-0x0000000002463000-memory.dmp

Filesize
76KB

Download
memory/4284-145-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/4284-132-0x0000000000A8D000-0x0000000000A9D000-memory.dmp

Filesize
64KB

Download
memory/4284-135-0x0000000000A8D000-0x0000000000A9D000-memory.dmp

Filesize
64KB

Download
memory/4284-136-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/4824-134-0x0000000000000000-mapping.dmp

Download

Analysis

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