tofsee | 71701f86d93f4ceee8e0bed7025bb3aede5fb789426b1e24b23360598ecee911

General

Target

1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe
Size

212KB
MD5

8ede678cf734084b01751c5d54f7fba3
SHA1

a706bed4987a37e4ee7367a28c144a57264c292b
SHA256

1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218
SHA512

a189411e8de914453ed6e96cee2d99395f36caf89f75fd738f53cf62fd827ecd34cee1ad10761db77a99b374d4003645542b446aaec51887d3228da5473b7135
SSDEEP

3072:Q/w2vKhLFzNxTvoecRDZFuxnpxyNmH25p062a3F5+mI7iMD:CWLFzN1y/Ytpt23V2a2J7iM

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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\mskegnej = "0"	svchost.exe

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

936 netsh.exe

pid	process
936	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\mskegnej\ImagePath = "C:\\Windows\\SysWOW64\\mskegnej\\uscdfbek.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

740 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

uscdfbek.exe

pid process

856 uscdfbek.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:

uscdfbek.exe

description pid process target process

PID 856 set thread context of 740 856 uscdfbek.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

1332 sc.exe
2036 sc.exe
1396 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
740	svchost.exe

pid	process
856	uscdfbek.exe

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

description	pid	process	target process
PID 856 set thread context of 740	856	uscdfbek.exe	svchost.exe

pid	process
1332	sc.exe
2036	sc.exe
1396	sc.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 30 IoCs

Processes:

1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exeuscdfbek.exe

description	pid	process	target process
PID 1040 wrote to memory of 1620	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1620	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1620	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1620	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1668	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1668	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1668	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1668	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	cmd.exe
PID 1040 wrote to memory of 1332	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1332	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1332	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1332	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 2036	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 2036	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 2036	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 2036	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1396	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1396	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1396	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 1396	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	sc.exe
PID 1040 wrote to memory of 936	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	netsh.exe
PID 1040 wrote to memory of 936	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	netsh.exe
PID 1040 wrote to memory of 936	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	netsh.exe
PID 1040 wrote to memory of 936	1040	1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe	netsh.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe
PID 856 wrote to memory of 740	856	uscdfbek.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe
"C:\Users\Admin\AppData\Local\Temp\1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1040

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mskegnej\
2⤵
PID:1620

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uscdfbek.exe" C:\Windows\SysWOW64\mskegnej\
2⤵
PID:1668

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create mskegnej binPath= "C:\Windows\SysWOW64\mskegnej\uscdfbek.exe /d\"C:\Users\Admin\AppData\Local\Temp\1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1332

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description mskegnej "wifi internet conection"
2⤵
- Launches sc.exe
PID:2036

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start mskegnej
2⤵
- Launches sc.exe
PID:1396

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:936

C:\Windows\SysWOW64\mskegnej\uscdfbek.exe
C:\Windows\SysWOW64\mskegnej\uscdfbek.exe /d"C:\Users\Admin\AppData\Local\Temp\1cf2f9ca3cc70c2919ba016a0166a95c81e1a09e95aaa5efb74c17e2a211c218.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:856

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:740

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

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\uscdfbek.exe
Filesize
14.0MB

MD5
649e737be8232a3c4162a7e3e2e544a9

SHA1
0637563631c5a8177c997a20af699047fe9798a1

SHA256
42fb913e9ab2e727c67a22b91e8cb38a5eedc96fea47027b847e88dc51e259bb

SHA512
c6e0048ec1ad44da30d1e2b74029aea7992cdb56b13970dc933ecafbdf3723fbce50080447acba21d145bdfbc8e5814a5fe6cac27b948236881ba292f67e70d1

Download Submit
C:\Windows\SysWOW64\mskegnej\uscdfbek.exe
Filesize
14.0MB

MD5
649e737be8232a3c4162a7e3e2e544a9

SHA1
0637563631c5a8177c997a20af699047fe9798a1

SHA256
42fb913e9ab2e727c67a22b91e8cb38a5eedc96fea47027b847e88dc51e259bb

SHA512
c6e0048ec1ad44da30d1e2b74029aea7992cdb56b13970dc933ecafbdf3723fbce50080447acba21d145bdfbc8e5814a5fe6cac27b948236881ba292f67e70d1

Download Submit
memory/740-61-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/740-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/740-63-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/740-67-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/740-68-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/740-69-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/740-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/856-64-0x0000000000400000-0x00000000004A2000-memory.dmp

Filesize
648KB

Download
memory/1040-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1040-58-0x0000000000400000-0x00000000004A2000-memory.dmp

Filesize
648KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads