tofsee | 55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c

General

Target

55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe
Size

105KB
MD5

e96dc72743408632ec53b7bc90d4dc7f
SHA1

6495db6d82ec97db7e088e04c154125cebde9923
SHA256

55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c
SHA512

4c9a6d745f8fa58a5a507c1389277e3d33b23c44ee51f354a0e8c86d734324ae1703b8a2349de9d7fe19bc484ad3b8e25c59088d07773517807e51c990846140

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

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\euhosaqs = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

cwyvplva.exe

pid process

668 cwyvplva.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1104 netsh.exe

pid	process
668	cwyvplva.exe

pid	process
1104	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\euhosaqs\ImagePath = "C:\\Windows\\SysWOW64\\euhosaqs\\cwyvplva.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1292 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cwyvplva.exe

description pid process target process

PID 668 set thread context of 1292 668 cwyvplva.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

1804 sc.exe
1532 sc.exe
1368 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
1292	svchost.exe

description	pid	process	target process
PID 668 set thread context of 1292	668	cwyvplva.exe	svchost.exe

pid	process
1804	sc.exe
1532	sc.exe
1368	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.execwyvplva.exe

description	pid	process	target process
PID 1328 wrote to memory of 608	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 608	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 608	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 608	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 1544	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 1544	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 1544	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 1544	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	cmd.exe
PID 1328 wrote to memory of 1532	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1532	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1532	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1532	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1368	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1368	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1368	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1368	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1804	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1804	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1804	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 1328 wrote to memory of 1804	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	sc.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe
PID 1328 wrote to memory of 1104	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	netsh.exe
PID 1328 wrote to memory of 1104	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	netsh.exe
PID 1328 wrote to memory of 1104	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	netsh.exe
PID 1328 wrote to memory of 1104	1328	55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe	netsh.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe
PID 668 wrote to memory of 1292	668	cwyvplva.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe
"C:\Users\Admin\AppData\Local\Temp\55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1328

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\euhosaqs\
2⤵
PID:608

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cwyvplva.exe" C:\Windows\SysWOW64\euhosaqs\
2⤵
PID:1544

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create euhosaqs binPath= "C:\Windows\SysWOW64\euhosaqs\cwyvplva.exe /d\"C:\Users\Admin\AppData\Local\Temp\55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1532

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description euhosaqs "wifi internet conection"
2⤵
- Launches sc.exe
PID:1368

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start euhosaqs
2⤵
- Launches sc.exe
PID:1804

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:1104

C:\Windows\SysWOW64\euhosaqs\cwyvplva.exe
C:\Windows\SysWOW64\euhosaqs\cwyvplva.exe /d"C:\Users\Admin\AppData\Local\Temp\55b3ccbe7bfce58fa9fbdbf2d7d492aa8c9def31d73982ac7e8b4ed3092e5f7c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:668

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1292

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\cwyvplva.exe
Filesize
14.6MB

MD5
4d5828e5253d8b584feb98d9cfddaa03

SHA1
d37ab5563ab48d293385cf7c4ebdf8348aace22d

SHA256
d678652c0a532bdbbec58b7b06a8cab03c93d249b3ff6973dc6632c30856e62d

SHA512
ef82965648d69d0985602fa5808caf8c744d4d6c6b9ce15cb73b4bdd7fa832274076683a2204c130daa4133830a7de320d62158dc1fbb7a448245438a4a6d593

Download Submit
C:\Windows\SysWOW64\euhosaqs\cwyvplva.exe
Filesize
14.6MB

MD5
4d5828e5253d8b584feb98d9cfddaa03

SHA1
d37ab5563ab48d293385cf7c4ebdf8348aace22d

SHA256
d678652c0a532bdbbec58b7b06a8cab03c93d249b3ff6973dc6632c30856e62d

SHA512
ef82965648d69d0985602fa5808caf8c744d4d6c6b9ce15cb73b4bdd7fa832274076683a2204c130daa4133830a7de320d62158dc1fbb7a448245438a4a6d593

Download Submit
memory/608-57-0x0000000000000000-mapping.dmp

Download
memory/668-66-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/668-65-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1104-69-0x0000000000000000-mapping.dmp

Download
memory/1292-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1292-77-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1292-75-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1292-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1292-71-0x0000000000089A6B-mapping.dmp

Download
memory/1328-54-0x0000000076A21000-0x0000000076A23000-memory.dmp

Filesize
8KB

Download
memory/1328-56-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1328-55-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/1368-61-0x0000000000000000-mapping.dmp

Download
memory/1532-60-0x0000000000000000-mapping.dmp

Download
memory/1544-58-0x0000000000000000-mapping.dmp

Download
memory/1804-62-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads