tofsee | d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa

General

Target

d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe
Size

299KB
MD5

572b56cf081eb05fd5e149c5c42d1750
SHA1

a7400abf0762a08475b418a042b0d67155bda028
SHA256

d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa
SHA512

7d4d5bad69990ede43f1137ceec73e74fdcde90a1e253bf81773cee5f821dae25db4e8b005335ed961a6149fc690e4c75b7b677526fb398fe217882fa0bc6954

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:

dxzwqmwb.exe

pid process

2988 dxzwqmwb.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4700 netsh.exe

pid	process
2988	dxzwqmwb.exe

pid	process
4700	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\zwaacdvu\ImagePath = "C:\\Windows\\SysWOW64\\zwaacdvu\\dxzwqmwb.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:

d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

dxzwqmwb.exe

description pid process target process

PID 2988 set thread context of 2420 2988 dxzwqmwb.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

3268 sc.exe
3276 sc.exe
832 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 2988 set thread context of 2420	2988	dxzwqmwb.exe	svchost.exe

pid	process
3268	sc.exe
3276	sc.exe
832	sc.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
1060	4452	WerFault.exe	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe
3004	2988	WerFault.exe	dxzwqmwb.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exedxzwqmwb.exe

description	pid	process	target process
PID 4452 wrote to memory of 4728	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 4728	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 4728	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 4784	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 4784	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 4784	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	cmd.exe
PID 4452 wrote to memory of 3268	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 3268	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 3268	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 3276	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 3276	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 3276	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 832	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 832	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 832	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	sc.exe
PID 4452 wrote to memory of 4700	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	netsh.exe
PID 4452 wrote to memory of 4700	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	netsh.exe
PID 4452 wrote to memory of 4700	4452	d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe	netsh.exe
PID 2988 wrote to memory of 2420	2988	dxzwqmwb.exe	svchost.exe
PID 2988 wrote to memory of 2420	2988	dxzwqmwb.exe	svchost.exe
PID 2988 wrote to memory of 2420	2988	dxzwqmwb.exe	svchost.exe
PID 2988 wrote to memory of 2420	2988	dxzwqmwb.exe	svchost.exe
PID 2988 wrote to memory of 2420	2988	dxzwqmwb.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe
"C:\Users\Admin\AppData\Local\Temp\d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4452

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zwaacdvu\
2⤵
PID:4728

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dxzwqmwb.exe" C:\Windows\SysWOW64\zwaacdvu\
2⤵
PID:4784

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create zwaacdvu binPath= "C:\Windows\SysWOW64\zwaacdvu\dxzwqmwb.exe /d\"C:\Users\Admin\AppData\Local\Temp\d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3268

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description zwaacdvu "wifi internet conection"
2⤵
- Launches sc.exe
PID:3276

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start zwaacdvu
2⤵
- Launches sc.exe
PID:832

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:4700

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4452 -s 1036
2⤵
- Program crash
PID:1060

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 188 -p 4452 -ip 4452
1⤵
PID:1236

C:\Windows\SysWOW64\zwaacdvu\dxzwqmwb.exe
C:\Windows\SysWOW64\zwaacdvu\dxzwqmwb.exe /d"C:\Users\Admin\AppData\Local\Temp\d99fdafe7f0e720d1ee19abe7a5af10f98f486407cbc23825bd0f6f19b7664fa.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2988

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:2420

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2988 -s 516
2⤵
- Program crash
PID:3004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2988 -ip 2988
1⤵
PID:828

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\dxzwqmwb.exe
Filesize
11.6MB

MD5
19653d5ad690808a16574ae2eb96a3f7

SHA1
c56a2672116874b55e4b95dd90ae0821aada3c08

SHA256
cc902127483bd38fbb548b46c76bdbabbb2260385fb032a1223080887b4aa747

SHA512
d978cb76597eff40379dd39bba1f6201d25cfe2ef7fa227e530f79b2c8ad6bc26256d5d95305af9dd475cff09e83ff2dd777a3bb3c230dd013c709d5f1e59ea5

Download Submit
C:\Windows\SysWOW64\zwaacdvu\dxzwqmwb.exe
Filesize
11.6MB

MD5
19653d5ad690808a16574ae2eb96a3f7

SHA1
c56a2672116874b55e4b95dd90ae0821aada3c08

SHA256
cc902127483bd38fbb548b46c76bdbabbb2260385fb032a1223080887b4aa747

SHA512
d978cb76597eff40379dd39bba1f6201d25cfe2ef7fa227e530f79b2c8ad6bc26256d5d95305af9dd475cff09e83ff2dd777a3bb3c230dd013c709d5f1e59ea5

Download Submit
memory/832-139-0x0000000000000000-mapping.dmp

Download
memory/2420-146-0x0000000000C10000-0x0000000000C25000-memory.dmp

Filesize
84KB

Download
memory/2420-145-0x0000000000000000-mapping.dmp

Download
memory/2420-152-0x0000000000C10000-0x0000000000C25000-memory.dmp

Filesize
84KB

Download
memory/2420-151-0x0000000000C10000-0x0000000000C25000-memory.dmp

Filesize
84KB

Download
memory/2988-142-0x0000000000400000-0x0000000000C52000-memory.dmp

Filesize
8.3MB

Download
memory/2988-150-0x0000000000CCB000-0x0000000000CD9000-memory.dmp

Filesize
56KB

Download
memory/2988-144-0x0000000000CCB000-0x0000000000CD9000-memory.dmp

Filesize
56KB

Download
memory/2988-149-0x0000000000400000-0x0000000000C52000-memory.dmp

Filesize
8.3MB

Download
memory/3268-137-0x0000000000000000-mapping.dmp

Download
memory/3276-138-0x0000000000000000-mapping.dmp

Download
memory/4452-130-0x0000000000400000-0x0000000000C52000-memory.dmp

Filesize
8.3MB

Download
memory/4452-133-0x0000000000400000-0x0000000000C52000-memory.dmp

Filesize
8.3MB

Download
memory/4452-143-0x0000000000400000-0x0000000000C52000-memory.dmp

Filesize
8.3MB

Download
memory/4452-132-0x0000000000F0F000-0x0000000000F1E000-memory.dmp

Filesize
60KB

Download
memory/4452-131-0x0000000000F0F000-0x0000000000F1E000-memory.dmp

Filesize
60KB

Download
memory/4700-140-0x0000000000000000-mapping.dmp

Download
memory/4728-134-0x0000000000000000-mapping.dmp

Download
memory/4784-135-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads