tofsee | 23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe

General

Target

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe
Size

98KB
MD5

e7108d1c5bbdb323e604f85f9293c3bb
SHA1

ed59cb4f3d4ce8e98e638954e610f57d036cbf5e
SHA256

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe
SHA512

1fd5f4d92e940d2db3003b77668e5cc5227e9c4b43ef2baaf882157876337d47bb964e8eefa37db1d20dd9c712f508e8ab015d73bd7932c8b86a494f1d8f54e9

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:

hyruboaz.exe

pid process

4600 hyruboaz.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4516 netsh.exe

pid	process
4600	hyruboaz.exe

pid	process
4516	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\rfgnzrvi\ImagePath = "C:\\Windows\\SysWOW64\\rfgnzrvi\\hyruboaz.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:

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

hyruboaz.exe

description pid process target process

PID 4600 set thread context of 2000 4600 hyruboaz.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

1272 sc.exe
3216 sc.exe
4844 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 4600 set thread context of 2000	4600	hyruboaz.exe	svchost.exe

pid	process
1272	sc.exe
3216	sc.exe
4844	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exehyruboaz.exe

description	pid	process	target process
PID 4832 wrote to memory of 4232	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4232	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4232	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4904	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4904	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4904	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	cmd.exe
PID 4832 wrote to memory of 4844	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 4844	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 4844	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 1272	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 1272	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 1272	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 3216	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 3216	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 3216	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	sc.exe
PID 4832 wrote to memory of 4516	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 4832 wrote to memory of 4516	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 4832 wrote to memory of 4516	4832	23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe	netsh.exe
PID 4600 wrote to memory of 2000	4600	hyruboaz.exe	svchost.exe
PID 4600 wrote to memory of 2000	4600	hyruboaz.exe	svchost.exe
PID 4600 wrote to memory of 2000	4600	hyruboaz.exe	svchost.exe
PID 4600 wrote to memory of 2000	4600	hyruboaz.exe	svchost.exe
PID 4600 wrote to memory of 2000	4600	hyruboaz.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe
"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rfgnzrvi\
  2⤵
  PID:4232
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hyruboaz.exe" C:\Windows\SysWOW64\rfgnzrvi\
  2⤵
  PID:4904
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rfgnzrvi binPath= "C:\Windows\SysWOW64\rfgnzrvi\hyruboaz.exe /d\"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rfgnzrvi "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1272
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rfgnzrvi
  2⤵
  - Launches sc.exe
  PID:3216
- 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:4516

C:\Windows\SysWOW64\rfgnzrvi\hyruboaz.exe
C:\Windows\SysWOW64\rfgnzrvi\hyruboaz.exe /d"C:\Users\Admin\AppData\Local\Temp\23e4f36a53a03c4b9bc31c8bb8a6eb2a9647ec8b2ba5b4d8dccf4f80b6ff9abe.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4600
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:2000

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

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

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\hyruboaz.exe

Filesize
14.5MB

MD5
5f1df1d278f7cc13be7be5f0b2a64eea

SHA1
9e1c7e476ec7efab3433931f2f836386a650cb01

SHA256
e35c4bb98d53917213afe0ea1e7778d855efc63acc7d87831816a9e990d85307

SHA512
054341b5107544a0d1db4adfa48e84a082ab3ad2b18f37f1cafc692339473e83185ef565ffdd44d2b7abff9eb9a8f4b14e4f2bbf6759d947522ff3880c2f05fb

Download Submit
C:\Windows\SysWOW64\rfgnzrvi\hyruboaz.exe

Filesize
14.5MB

MD5
5f1df1d278f7cc13be7be5f0b2a64eea

SHA1
9e1c7e476ec7efab3433931f2f836386a650cb01

SHA256
e35c4bb98d53917213afe0ea1e7778d855efc63acc7d87831816a9e990d85307

SHA512
054341b5107544a0d1db4adfa48e84a082ab3ad2b18f37f1cafc692339473e83185ef565ffdd44d2b7abff9eb9a8f4b14e4f2bbf6759d947522ff3880c2f05fb

Download Submit
memory/1272-135-0x0000000000000000-mapping.dmp

Download
memory/2000-145-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/2000-144-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/2000-140-0x0000000000000000-mapping.dmp

Download
memory/2000-141-0x0000000000480000-0x0000000000495000-memory.dmp

Filesize
84KB

Download
memory/3216-136-0x0000000000000000-mapping.dmp

Download
memory/4232-131-0x0000000000000000-mapping.dmp

Download
memory/4516-137-0x0000000000000000-mapping.dmp

Download
memory/4600-139-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4832-130-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4844-134-0x0000000000000000-mapping.dmp

Download
memory/4904-132-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads