tofsee | 997f091cec1b6b0ca4c760582289f88fc845072e15d22fb9ebbc70d8a411eb34

General

Target

file.exe
Size

167KB
MD5

db37e2dceca24b2a30667e7a26816e5a
SHA1

a52d6f9718d4cb71f623f463cd590f76ad04878c
SHA256

997f091cec1b6b0ca4c760582289f88fc845072e15d22fb9ebbc70d8a411eb34
SHA512

b1f0795046296ce3ded9b195d40308999d3800f6886abff6730df2a047f30d3188828b48bd697069f51f038d8ff876d69e07563ef242070b30e219dce04b948c
SSDEEP

3072:MVtkj/2yjSgA2EVu5W+L/l5JYmsd//FuJpXxS5osnN:MnK+gA2EIL/lYZFupXI/

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:

bhzotmd.exe

pid process

3904 bhzotmd.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3980 netsh.exe

pid	process
3904	bhzotmd.exe

pid	process
3980	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\ubghzjgj\ImagePath = "C:\\Windows\\SysWOW64\\ubghzjgj\\bhzotmd.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

bhzotmd.exe

description pid process target process

PID 3904 set thread context of 4604 3904 bhzotmd.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

4260 sc.exe
1764 sc.exe
3912 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 3904 set thread context of 4604	3904	bhzotmd.exe	svchost.exe

pid	process
4260	sc.exe
1764	sc.exe
3912	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exebhzotmd.exe

description	pid	process	target process
PID 5052 wrote to memory of 4512	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 4512	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 4512	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 1412	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 1412	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 1412	5052	file.exe	cmd.exe
PID 5052 wrote to memory of 1764	5052	file.exe	sc.exe
PID 5052 wrote to memory of 1764	5052	file.exe	sc.exe
PID 5052 wrote to memory of 1764	5052	file.exe	sc.exe
PID 5052 wrote to memory of 3912	5052	file.exe	sc.exe
PID 5052 wrote to memory of 3912	5052	file.exe	sc.exe
PID 5052 wrote to memory of 3912	5052	file.exe	sc.exe
PID 5052 wrote to memory of 4260	5052	file.exe	sc.exe
PID 5052 wrote to memory of 4260	5052	file.exe	sc.exe
PID 5052 wrote to memory of 4260	5052	file.exe	sc.exe
PID 5052 wrote to memory of 3980	5052	file.exe	netsh.exe
PID 5052 wrote to memory of 3980	5052	file.exe	netsh.exe
PID 5052 wrote to memory of 3980	5052	file.exe	netsh.exe
PID 3904 wrote to memory of 4604	3904	bhzotmd.exe	svchost.exe
PID 3904 wrote to memory of 4604	3904	bhzotmd.exe	svchost.exe
PID 3904 wrote to memory of 4604	3904	bhzotmd.exe	svchost.exe
PID 3904 wrote to memory of 4604	3904	bhzotmd.exe	svchost.exe
PID 3904 wrote to memory of 4604	3904	bhzotmd.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:5052

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ubghzjgj\
2⤵
PID:4512

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bhzotmd.exe" C:\Windows\SysWOW64\ubghzjgj\
2⤵
PID:1412

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ubghzjgj binPath= "C:\Windows\SysWOW64\ubghzjgj\bhzotmd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1764

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ubghzjgj "wifi internet conection"
2⤵
- Launches sc.exe
PID:3912

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ubghzjgj
2⤵
- Launches sc.exe
PID:4260

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:3980

C:\Windows\SysWOW64\ubghzjgj\bhzotmd.exe
C:\Windows\SysWOW64\ubghzjgj\bhzotmd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3904

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4604

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\bhzotmd.exe
Filesize
13.0MB

MD5
c775be10a204cdfdbd1854c6231f547d

SHA1
506710a1f4dd19d9f635351926ddb6d81059c596

SHA256
9612e630417beba4cfd9e76b8685de422fabea6caf192494fa61cfaad53bc213

SHA512
3153d295fb3e65c4b012043cfda38619f49ddb27dd96bec80cbefc59375d768a8f6864a9dc5ea7c557270ec0c7453a9532311951b4c567e7b7472cf73b7817ad

Download Submit
C:\Windows\SysWOW64\ubghzjgj\bhzotmd.exe
Filesize
13.0MB

MD5
c775be10a204cdfdbd1854c6231f547d

SHA1
506710a1f4dd19d9f635351926ddb6d81059c596

SHA256
9612e630417beba4cfd9e76b8685de422fabea6caf192494fa61cfaad53bc213

SHA512
3153d295fb3e65c4b012043cfda38619f49ddb27dd96bec80cbefc59375d768a8f6864a9dc5ea7c557270ec0c7453a9532311951b4c567e7b7472cf73b7817ad

Download Submit
memory/1412-136-0x0000000000000000-mapping.dmp

Download
memory/1764-138-0x0000000000000000-mapping.dmp

Download
memory/3904-149-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/3904-146-0x0000000000A78000-0x0000000000A88000-memory.dmp

Filesize
64KB

Download
memory/3912-139-0x0000000000000000-mapping.dmp

Download
memory/3980-142-0x0000000000000000-mapping.dmp

Download
memory/4260-140-0x0000000000000000-mapping.dmp

Download
memory/4512-135-0x0000000000000000-mapping.dmp

Download
memory/4604-144-0x0000000000000000-mapping.dmp

Download
memory/4604-145-0x00000000009A0000-0x00000000009B5000-memory.dmp

Filesize
84KB

Download
memory/4604-150-0x00000000009A0000-0x00000000009B5000-memory.dmp

Filesize
84KB

Download
memory/4604-151-0x00000000009A0000-0x00000000009B5000-memory.dmp

Filesize
84KB

Download
memory/5052-132-0x000000000080D000-0x000000000081D000-memory.dmp

Filesize
64KB

Download
memory/5052-143-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/5052-134-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/5052-133-0x0000000002450000-0x0000000002463000-memory.dmp

Filesize
76KB

Download

Analysis

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