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

1632 netsh.exe

pid	process
1632	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\fokyyzxv\ImagePath = "C:\\Windows\\SysWOW64\\fokyyzxv\\tnsqloln.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

484 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

tnsqloln.exe

pid process

944 tnsqloln.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

tnsqloln.exe

description pid process target process

PID 944 set thread context of 484 944 tnsqloln.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

1692 sc.exe
1624 sc.exe
672 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
484	svchost.exe

pid	process
944	tnsqloln.exe

description	pid	process	target process
PID 944 set thread context of 484	944	tnsqloln.exe	svchost.exe

pid	process
1692	sc.exe
1624	sc.exe
672	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

097bc3c7d6f6f50a503fdb7a56e22a34.exetnsqloln.exe

description	pid	process	target process
PID 1340 wrote to memory of 1156	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 1156	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 1156	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 1156	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 472	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 472	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 472	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 472	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 1340 wrote to memory of 672	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 672	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 672	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 672	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1692	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1692	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1692	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1692	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1624	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1624	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1624	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1624	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 1340 wrote to memory of 1632	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 1340 wrote to memory of 1632	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 1340 wrote to memory of 1632	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 1340 wrote to memory of 1632	1340	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe
PID 944 wrote to memory of 484	944	tnsqloln.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe
"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1340

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fokyyzxv\
2⤵
PID:1156

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tnsqloln.exe" C:\Windows\SysWOW64\fokyyzxv\
2⤵
PID:472

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create fokyyzxv binPath= "C:\Windows\SysWOW64\fokyyzxv\tnsqloln.exe /d\"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:672

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description fokyyzxv "wifi internet conection"
2⤵
- Launches sc.exe
PID:1692

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start fokyyzxv
2⤵
- Launches sc.exe
PID:1624

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:1632

C:\Windows\SysWOW64\fokyyzxv\tnsqloln.exe
C:\Windows\SysWOW64\fokyyzxv\tnsqloln.exe /d"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:944

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Deletes itself
PID:484

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tnsqloln.exe
Filesize
10.8MB

MD5
d0da6c8334cd7e97edccad378ff8c114

SHA1
e7077237b322575ccaa80fce127d718ed3c80b62

SHA256
d07270e709edfa82bf5ccbc7f167ad118dd18de77655c3960ba4dfcf2372c4fa

SHA512
300d10a7b3cbd0cea708adf87afb6d7fcd0c74f8c0332164005f85ed7dfd8744955bdbaa1e8d5120a3e166a47a0cf083ce72bab88635fd64a87f633bf7334598

Download Submit
C:\Windows\SysWOW64\fokyyzxv\tnsqloln.exe
Filesize
10.8MB

MD5
d0da6c8334cd7e97edccad378ff8c114

SHA1
e7077237b322575ccaa80fce127d718ed3c80b62

SHA256
d07270e709edfa82bf5ccbc7f167ad118dd18de77655c3960ba4dfcf2372c4fa

SHA512
300d10a7b3cbd0cea708adf87afb6d7fcd0c74f8c0332164005f85ed7dfd8744955bdbaa1e8d5120a3e166a47a0cf083ce72bab88635fd64a87f633bf7334598

Download Submit
memory/484-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/484-75-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/484-74-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/484-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/484-67-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/484-66-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/484-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/944-69-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/1340-55-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/1340-63-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/1340-59-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/1340-58-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download

Analysis

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