tofsee | 61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334

General

Target

61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe
Size

139KB
MD5

59716c29133bdaf34175ab183a1a7e3c
SHA1

e265094493c86a5a5a2596563cb9c47c592ec599
SHA256

61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334
SHA512

68b05b8a8ca0c40a395de19ed8792c59641155f69e0a9704505a016872de88c5c7f6784f54b0740f0ffb3668bcf85bb263cfc59f7dcdcc50c73444a18976b3eb

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:

cyugvkrp.exe

pid process

4240 cyugvkrp.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3444 netsh.exe

pid	process
4240	cyugvkrp.exe

pid	process
3444	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\pwbtfmzl\ImagePath = "C:\\Windows\\SysWOW64\\pwbtfmzl\\cyugvkrp.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:

61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2372564722-193526734-2636556182-1000\Control Panel\International\Geo\Nation	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

cyugvkrp.exe

description pid process target process

PID 4240 set thread context of 5116 4240 cyugvkrp.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

1300 sc.exe
4988 sc.exe
1560 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 4240 set thread context of 5116	4240	cyugvkrp.exe	svchost.exe

pid	process
1300	sc.exe
4988	sc.exe
1560	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.execyugvkrp.exe

description	pid	process	target process
PID 4732 wrote to memory of 2572	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 2572	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 2572	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 3148	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 3148	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 3148	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	cmd.exe
PID 4732 wrote to memory of 4988	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 4988	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 4988	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1560	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1560	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1560	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1300	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1300	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 1300	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	sc.exe
PID 4732 wrote to memory of 3444	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	netsh.exe
PID 4732 wrote to memory of 3444	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	netsh.exe
PID 4732 wrote to memory of 3444	4732	61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe	netsh.exe
PID 4240 wrote to memory of 5116	4240	cyugvkrp.exe	svchost.exe
PID 4240 wrote to memory of 5116	4240	cyugvkrp.exe	svchost.exe
PID 4240 wrote to memory of 5116	4240	cyugvkrp.exe	svchost.exe
PID 4240 wrote to memory of 5116	4240	cyugvkrp.exe	svchost.exe
PID 4240 wrote to memory of 5116	4240	cyugvkrp.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe
"C:\Users\Admin\AppData\Local\Temp\61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4732

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pwbtfmzl\
2⤵
PID:2572

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cyugvkrp.exe" C:\Windows\SysWOW64\pwbtfmzl\
2⤵
PID:3148

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create pwbtfmzl binPath= "C:\Windows\SysWOW64\pwbtfmzl\cyugvkrp.exe /d\"C:\Users\Admin\AppData\Local\Temp\61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4988

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description pwbtfmzl "wifi internet conection"
2⤵
- Launches sc.exe
PID:1560

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start pwbtfmzl
2⤵
- Launches sc.exe
PID:1300

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:3444

C:\Windows\SysWOW64\pwbtfmzl\cyugvkrp.exe
C:\Windows\SysWOW64\pwbtfmzl\cyugvkrp.exe /d"C:\Users\Admin\AppData\Local\Temp\61d06bf851691930e040bb472f567fa64a973936bd43fe325096e33b4bc48334.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4240

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:5116

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\cyugvkrp.exe
Filesize
14.6MB

MD5
0ca32c9dcc77a50a7f42b925b9424e89

SHA1
7b7058cd9e9989ff47202a9dcaecc6c9bf943b51

SHA256
042c61e73c85fc5960584f74bd4540480deec93cf8fff2c33f336f25e636e794

SHA512
5e2bbde3dd979f80af817712c13beecded663f04d1b0551240e9fd51918f814700fa7f55e4615e35e172f4ba7cdc0a681f07f2120dd0e03cd9453cab89a7bdad

Download Submit
C:\Windows\SysWOW64\pwbtfmzl\cyugvkrp.exe
Filesize
14.6MB

MD5
0ca32c9dcc77a50a7f42b925b9424e89

SHA1
7b7058cd9e9989ff47202a9dcaecc6c9bf943b51

SHA256
042c61e73c85fc5960584f74bd4540480deec93cf8fff2c33f336f25e636e794

SHA512
5e2bbde3dd979f80af817712c13beecded663f04d1b0551240e9fd51918f814700fa7f55e4615e35e172f4ba7cdc0a681f07f2120dd0e03cd9453cab89a7bdad

Download Submit
memory/1300-136-0x0000000000000000-mapping.dmp

Download
memory/1560-135-0x0000000000000000-mapping.dmp

Download
memory/2572-131-0x0000000000000000-mapping.dmp

Download
memory/3148-132-0x0000000000000000-mapping.dmp

Download
memory/3444-137-0x0000000000000000-mapping.dmp

Download
memory/4240-139-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4732-130-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4988-134-0x0000000000000000-mapping.dmp

Download
memory/5116-140-0x0000000000000000-mapping.dmp

Download
memory/5116-141-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download
memory/5116-144-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download
memory/5116-145-0x0000000000660000-0x0000000000675000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads