tofsee | 1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8

General

Target

1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe
Size

138KB
MD5

e70dc7260416996a8b62ff3b6e0420f6
SHA1

3ad2783d4bc4ffd6d0a2dd4a61f16229b27839d0
SHA256

1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8
SHA512

260dfd93c94cf67c91345a1d8c6a5c2399633e25b53b8ad3d87b246235893a385728c86229f36ac257fe20d5dd979248af2c90b5b93f9dc402a0d59b6b71662e

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
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

emfvaxpz.exe

pid process

4464 emfvaxpz.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4448 netsh.exe

pid	process
4464	emfvaxpz.exe

pid	process
4448	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\yymggskw\ImagePath = "C:\\Windows\\SysWOW64\\yymggskw\\emfvaxpz.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:

1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

emfvaxpz.exe

description pid process target process

PID 4464 set thread context of 3360 4464 emfvaxpz.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

4472 sc.exe
4936 sc.exe
1016 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	pid	process	target process
PID 4464 set thread context of 3360	4464	emfvaxpz.exe	svchost.exe

pid	process
4472	sc.exe
4936	sc.exe
1016	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exeemfvaxpz.exe

description	pid	process	target process
PID 3940 wrote to memory of 424	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 424	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 424	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 4264	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 4264	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 4264	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	cmd.exe
PID 3940 wrote to memory of 4936	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4936	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4936	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 1016	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 1016	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 1016	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4472	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4472	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4472	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	sc.exe
PID 3940 wrote to memory of 4448	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	netsh.exe
PID 3940 wrote to memory of 4448	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	netsh.exe
PID 3940 wrote to memory of 4448	3940	1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe	netsh.exe
PID 4464 wrote to memory of 3360	4464	emfvaxpz.exe	svchost.exe
PID 4464 wrote to memory of 3360	4464	emfvaxpz.exe	svchost.exe
PID 4464 wrote to memory of 3360	4464	emfvaxpz.exe	svchost.exe
PID 4464 wrote to memory of 3360	4464	emfvaxpz.exe	svchost.exe
PID 4464 wrote to memory of 3360	4464	emfvaxpz.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe
"C:\Users\Admin\AppData\Local\Temp\1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3940

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yymggskw\
2⤵
PID:424

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\emfvaxpz.exe" C:\Windows\SysWOW64\yymggskw\
2⤵
PID:4264

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create yymggskw binPath= "C:\Windows\SysWOW64\yymggskw\emfvaxpz.exe /d\"C:\Users\Admin\AppData\Local\Temp\1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4936

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description yymggskw "wifi internet conection"
2⤵
- Launches sc.exe
PID:1016

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start yymggskw
2⤵
- Launches sc.exe
PID:4472

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:4448

C:\Windows\SysWOW64\yymggskw\emfvaxpz.exe
C:\Windows\SysWOW64\yymggskw\emfvaxpz.exe /d"C:\Users\Admin\AppData\Local\Temp\1c8743843e7dcdc405dcfdc5745a05d66f8807740d0d7e3cd169172b9559c0d8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4464

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:3360

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\emfvaxpz.exe
Filesize
14.0MB

MD5
938b2e4278e9a84144c4f5e249c5fe24

SHA1
4b8bf818da705880b7537056ec4788888e5c70f6

SHA256
080c11803667eca9bdde6b089c14983f19fdea5eca026094db7473e8274962bd

SHA512
cdd2dadb17174823f392dcb95e053a6a6df0f8a89abe9b088a9db22e55b2e5938d115ad83a24d98e501ba88dcf7521d4175bb00be432e9da251a43c515fb1980

Download Submit
C:\Windows\SysWOW64\yymggskw\emfvaxpz.exe
Filesize
14.0MB

MD5
938b2e4278e9a84144c4f5e249c5fe24

SHA1
4b8bf818da705880b7537056ec4788888e5c70f6

SHA256
080c11803667eca9bdde6b089c14983f19fdea5eca026094db7473e8274962bd

SHA512
cdd2dadb17174823f392dcb95e053a6a6df0f8a89abe9b088a9db22e55b2e5938d115ad83a24d98e501ba88dcf7521d4175bb00be432e9da251a43c515fb1980

Download Submit
memory/424-131-0x0000000000000000-mapping.dmp

Download
memory/1016-135-0x0000000000000000-mapping.dmp

Download
memory/3360-141-0x00000000003A0000-0x00000000003B5000-memory.dmp

Filesize
84KB

Download
memory/3360-145-0x00000000003A0000-0x00000000003B5000-memory.dmp

Filesize
84KB

Download
memory/3360-144-0x00000000003A0000-0x00000000003B5000-memory.dmp

Filesize
84KB

Download
memory/3360-140-0x0000000000000000-mapping.dmp

Download
memory/3940-130-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4264-132-0x0000000000000000-mapping.dmp

Download
memory/4448-137-0x0000000000000000-mapping.dmp

Download
memory/4464-139-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4472-136-0x0000000000000000-mapping.dmp

Download
memory/4936-134-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads