tofsee | 25ed67b390cafbd1ebcebed4c9cad13c38e6998c45e501e23d6652ac04bb69ef

General

Target

097bc3c7d6f6f50a503fdb7a56e22a34.exe
Size

312KB
MD5

097bc3c7d6f6f50a503fdb7a56e22a34
SHA1

bc801204c76b73ee9e66a9a7bdffd856965604e0
SHA256

25ed67b390cafbd1ebcebed4c9cad13c38e6998c45e501e23d6652ac04bb69ef
SHA512

7dedbefbe0a0af1d1541374a1a8916eb45d6037c15b8ae36ed28c4dfc0a9d22f5062b584b856b8d32cf5d675f1a718b31b029dc5abcea4c40d8925ae42f05eea
SSDEEP

3072:6AX8ODio3+FCLQbFK+OCQ/KbqAjxBn7UJIdg6hO3Vd+eVRg/5wcw3P3XqT:vPDl5L0FKBDKbzBYd6upvG

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

5000 netsh.exe

pid	process
5000	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\jubxzywc\ImagePath = "C:\\Windows\\SysWOW64\\jubxzywc\\kzrydbgy.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:

097bc3c7d6f6f50a503fdb7a56e22a34.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Control Panel\International\Geo\Nation	097bc3c7d6f6f50a503fdb7a56e22a34.exe

Executes dropped EXE 1 IoCs

Processes:

kzrydbgy.exe

pid process

4844 kzrydbgy.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

kzrydbgy.exe

description pid process target process

PID 4844 set thread context of 652 4844 kzrydbgy.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

4652 sc.exe
4996 sc.exe
4920 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

1764 3332 WerFault.exe 097bc3c7d6f6f50a503fdb7a56e22a34.exe
1852 4844 WerFault.exe kzrydbgy.exe

pid	process
4844	kzrydbgy.exe

description	pid	process	target process
PID 4844 set thread context of 652	4844	kzrydbgy.exe	svchost.exe

pid	process
4652	sc.exe
4996	sc.exe
4920	sc.exe

pid	pid_target	process	target process
1764	3332	WerFault.exe	097bc3c7d6f6f50a503fdb7a56e22a34.exe
1852	4844	WerFault.exe	kzrydbgy.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

097bc3c7d6f6f50a503fdb7a56e22a34.exekzrydbgy.exe

description	pid	process	target process
PID 3332 wrote to memory of 404	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 404	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 404	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 2692	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 2692	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 2692	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 3332 wrote to memory of 4652	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4652	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4652	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4996	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4996	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4996	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4920	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4920	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 4920	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 3332 wrote to memory of 5000	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 3332 wrote to memory of 5000	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 3332 wrote to memory of 5000	3332	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 4844 wrote to memory of 652	4844	kzrydbgy.exe	svchost.exe
PID 4844 wrote to memory of 652	4844	kzrydbgy.exe	svchost.exe
PID 4844 wrote to memory of 652	4844	kzrydbgy.exe	svchost.exe
PID 4844 wrote to memory of 652	4844	kzrydbgy.exe	svchost.exe
PID 4844 wrote to memory of 652	4844	kzrydbgy.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe
"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3332

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jubxzywc\
2⤵
PID:404

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kzrydbgy.exe" C:\Windows\SysWOW64\jubxzywc\
2⤵
PID:2692

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create jubxzywc binPath= "C:\Windows\SysWOW64\jubxzywc\kzrydbgy.exe /d\"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4652

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description jubxzywc "wifi internet conection"
2⤵
- Launches sc.exe
PID:4996

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start jubxzywc
2⤵
- Launches sc.exe
PID:4920

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:5000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3332 -s 1040
2⤵
- Program crash
PID:1764

C:\Windows\SysWOW64\jubxzywc\kzrydbgy.exe
C:\Windows\SysWOW64\jubxzywc\kzrydbgy.exe /d"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4844

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:652

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4844 -s 516
2⤵
- Program crash
PID:1852

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3332 -ip 3332
1⤵
PID:3068

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4844 -ip 4844
1⤵
PID:1832

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\kzrydbgy.exe
Filesize
10.7MB

MD5
637a82fbb9932b9f21ba291e34f7b40a

SHA1
01c49179f3382cf4f96c2e9e16e8fa669b6dc6fc

SHA256
70e05eaf4f9275cbd2b8a8720754beef860b8666fb0f464c8210e759d119ae3f

SHA512
5e4a15f6fd549d4602f27f23033fa866a494bca089cb8b08cd2e731e7e261bcf80dfb3d1c6c7b7001d5aa805a10a87e1fda50a141e52d252c426390722342347

Download Submit
C:\Windows\SysWOW64\jubxzywc\kzrydbgy.exe
Filesize
10.7MB

MD5
637a82fbb9932b9f21ba291e34f7b40a

SHA1
01c49179f3382cf4f96c2e9e16e8fa669b6dc6fc

SHA256
70e05eaf4f9275cbd2b8a8720754beef860b8666fb0f464c8210e759d119ae3f

SHA512
5e4a15f6fd549d4602f27f23033fa866a494bca089cb8b08cd2e731e7e261bcf80dfb3d1c6c7b7001d5aa805a10a87e1fda50a141e52d252c426390722342347

Download Submit
memory/652-149-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/652-145-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/652-150-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/652-152-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/652-153-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/3332-138-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/3332-135-0x0000000000760000-0x0000000000773000-memory.dmp

Filesize
76KB

Download
memory/3332-142-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/3332-143-0x0000000000760000-0x0000000000773000-memory.dmp

Filesize
76KB

Download
memory/3332-134-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/4844-144-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/4844-151-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads