tofsee | 39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9

General

Target

39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe
Size

258KB
MD5

7a717003f647ffa187853202db3cbe44
SHA1

10b25fb91c1e200aba57b13ca96996a3a62dc77f
SHA256

39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9
SHA512

0c97a36671dd383481f665d910038404aa83b9e37cfcd127a08a7a57865b04450f19dc3a987d04b4e01aeed54835d126325042655e0116dfe12f687dd40b0577

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:

mpxxvtxg.exe

pid process

232 mpxxvtxg.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

864 netsh.exe

pid	process
232	mpxxvtxg.exe

pid	process
864	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\erlkpci\ImagePath = "C:\\Windows\\SysWOW64\\erlkpci\\mpxxvtxg.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:

39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mpxxvtxg.exe

description pid process target process

PID 232 set thread context of 1176 232 mpxxvtxg.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

2636 sc.exe
4720 sc.exe
4700 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 232 set thread context of 1176	232	mpxxvtxg.exe	svchost.exe

pid	process
2636	sc.exe
4720	sc.exe
4700	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exempxxvtxg.exe

description	pid	process	target process
PID 3880 wrote to memory of 4788	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 4788	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 4788	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 4800	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 4800	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 4800	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	cmd.exe
PID 3880 wrote to memory of 2636	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 2636	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 2636	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4720	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4720	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4720	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4700	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4700	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 4700	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	sc.exe
PID 3880 wrote to memory of 864	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	netsh.exe
PID 3880 wrote to memory of 864	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	netsh.exe
PID 3880 wrote to memory of 864	3880	39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe	netsh.exe
PID 232 wrote to memory of 1176	232	mpxxvtxg.exe	svchost.exe
PID 232 wrote to memory of 1176	232	mpxxvtxg.exe	svchost.exe
PID 232 wrote to memory of 1176	232	mpxxvtxg.exe	svchost.exe
PID 232 wrote to memory of 1176	232	mpxxvtxg.exe	svchost.exe
PID 232 wrote to memory of 1176	232	mpxxvtxg.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe
"C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3880

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\erlkpci\
2⤵
PID:4788

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpxxvtxg.exe" C:\Windows\SysWOW64\erlkpci\
2⤵
PID:4800

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create erlkpci binPath= "C:\Windows\SysWOW64\erlkpci\mpxxvtxg.exe /d\"C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2636

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description erlkpci "wifi internet conection"
2⤵
- Launches sc.exe
PID:4720

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start erlkpci
2⤵
- Launches sc.exe
PID:4700

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:864

C:\Windows\SysWOW64\erlkpci\mpxxvtxg.exe
C:\Windows\SysWOW64\erlkpci\mpxxvtxg.exe /d"C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:232

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1176

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\mpxxvtxg.exe
Filesize
13.1MB

MD5
820bb825a0aa15085eb518876d73a33b

SHA1
aa5e05b295fc80b78f627625507f94fb85214f17

SHA256
7ee73832fdef0e5f3b541d8ea89fef9846f63a98504e4ae4df528b2db6841c52

SHA512
6db811192355b85e1c99a55a6f0240b491ffaaed8ddf31376fe664b5a27b577ea1a74977374385c00fd310740d5fab047abc88e26a7f808d6c574c435efa9cd7

Download Submit
C:\Windows\SysWOW64\erlkpci\mpxxvtxg.exe
Filesize
13.1MB

MD5
820bb825a0aa15085eb518876d73a33b

SHA1
aa5e05b295fc80b78f627625507f94fb85214f17

SHA256
7ee73832fdef0e5f3b541d8ea89fef9846f63a98504e4ae4df528b2db6841c52

SHA512
6db811192355b85e1c99a55a6f0240b491ffaaed8ddf31376fe664b5a27b577ea1a74977374385c00fd310740d5fab047abc88e26a7f808d6c574c435efa9cd7

Download Submit
memory/232-142-0x0000000000F00000-0x0000000000F11000-memory.dmp

Filesize
68KB

Download
memory/232-146-0x0000000000F00000-0x0000000000F11000-memory.dmp

Filesize
68KB

Download
memory/232-148-0x0000000000400000-0x0000000000C47000-memory.dmp

Filesize
8.3MB

Download
memory/864-138-0x0000000000000000-mapping.dmp

Download
memory/1176-150-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/1176-149-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/1176-143-0x0000000000000000-mapping.dmp

Download
memory/1176-144-0x0000000000490000-0x00000000004A5000-memory.dmp

Filesize
84KB

Download
memory/2636-135-0x0000000000000000-mapping.dmp

Download
memory/3880-133-0x0000000000400000-0x0000000000C47000-memory.dmp

Filesize
8.3MB

Download
memory/3880-139-0x0000000000D34000-0x0000000000D45000-memory.dmp

Filesize
68KB

Download
memory/3880-140-0x0000000000400000-0x0000000000C47000-memory.dmp

Filesize
8.3MB

Download
memory/3880-130-0x0000000000D34000-0x0000000000D45000-memory.dmp

Filesize
68KB

Download
memory/4700-137-0x0000000000000000-mapping.dmp

Download
memory/4720-136-0x0000000000000000-mapping.dmp

Download
memory/4788-131-0x0000000000000000-mapping.dmp

Download
memory/4800-132-0x0000000000000000-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