tofsee | edf98c8d92926d258cf70c2348ab4c68d31b377cd273b0686f12e3545089030b

Analysis

max time kernel
144s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
16-05-2024 23:05

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General

Target

8245c3b357c4dfcce7e058464c58c5fe.exe
Size

99KB
MD5

8245c3b357c4dfcce7e058464c58c5fe
SHA1

82c5f666ac6e8ef1f886c058d3761c50d9b90567
SHA256

d5f21ec21489e4ec2809672b6981fb9b21dca30952fb1ed18a0907b54912aa9e
SHA512

f489655ee4cbc5f16ce0d1ba2dda8ad9fd58ff8d0f48631a44d8a6f07d8988995026cc455107a17ad34230eb3dd8f1fd4c1450e45573d51f4304311aba027c6b
SSDEEP

1536:RWpoiWXY7wb9Zn6jhKV53LuHxp4mmkrkrTpwJx2FrNSjlxVgpo:4dWxj6AV53Lu0mmkrCwR9

Score

10^/10

tofsee evasion execution persistence trojan

Malware Config

Extracted

Family

tofsee

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) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

3312 netsh.exe

pid	process
3312	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\vjxwyvrl\ImagePath = "C:\\Windows\\SysWOW64\\vjxwyvrl\\inaadcsx.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:

8245c3b357c4dfcce7e058464c58c5fe.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	8245c3b357c4dfcce7e058464c58c5fe.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

4596 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

inaadcsx.exe

pid process

1792 inaadcsx.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

inaadcsx.exe

description pid process target process

PID 1792 set thread context of 4596 1792 inaadcsx.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

3188 sc.exe
4136 sc.exe
3816 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
4596	svchost.exe

pid	process
1792	inaadcsx.exe

description	pid	process	target process
PID 1792 set thread context of 4596	1792	inaadcsx.exe	svchost.exe

pid	process
3188	sc.exe
4136	sc.exe
3816	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

8245c3b357c4dfcce7e058464c58c5fe.exeinaadcsx.exe

description	pid	process	target process
PID 4608 wrote to memory of 3376	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 3376	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 3376	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 1084	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 1084	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 1084	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	cmd.exe
PID 4608 wrote to memory of 4136	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 4136	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 4136	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3816	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3816	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3816	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3188	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3188	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 4608 wrote to memory of 3188	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	sc.exe
PID 1792 wrote to memory of 4596	1792	inaadcsx.exe	svchost.exe
PID 1792 wrote to memory of 4596	1792	inaadcsx.exe	svchost.exe
PID 1792 wrote to memory of 4596	1792	inaadcsx.exe	svchost.exe
PID 1792 wrote to memory of 4596	1792	inaadcsx.exe	svchost.exe
PID 1792 wrote to memory of 4596	1792	inaadcsx.exe	svchost.exe
PID 4608 wrote to memory of 3312	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	netsh.exe
PID 4608 wrote to memory of 3312	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	netsh.exe
PID 4608 wrote to memory of 3312	4608	8245c3b357c4dfcce7e058464c58c5fe.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\8245c3b357c4dfcce7e058464c58c5fe.exe
"C:\Users\Admin\AppData\Local\Temp\8245c3b357c4dfcce7e058464c58c5fe.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4608

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vjxwyvrl\
2⤵
PID:3376

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\inaadcsx.exe" C:\Windows\SysWOW64\vjxwyvrl\
2⤵
PID:1084

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vjxwyvrl binPath= "C:\Windows\SysWOW64\vjxwyvrl\inaadcsx.exe /d\"C:\Users\Admin\AppData\Local\Temp\8245c3b357c4dfcce7e058464c58c5fe.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4136

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vjxwyvrl "wifi internet conection"
2⤵
- Launches sc.exe
PID:3816

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vjxwyvrl
2⤵
- Launches sc.exe
PID:3188

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:3312

C:\Windows\SysWOW64\vjxwyvrl\inaadcsx.exe
C:\Windows\SysWOW64\vjxwyvrl\inaadcsx.exe /d"C:\Users\Admin\AppData\Local\Temp\8245c3b357c4dfcce7e058464c58c5fe.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1792

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Deletes itself
PID:4596

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\inaadcsx.exe
Filesize
12.2MB

MD5
306417e13ae7af5d762773314b194221

SHA1
5be78cf96cd6a4aba3c588a3dba8c03f0b417ab9

SHA256
b21038d149e08ada4dcbfe6ff996238015e13de0ca05aecd2b3bd355c12c8d6f

SHA512
f6fa43dad984e5c66176bf6cbac93bf01647ba9335a304b4b6fb6b6e500e407cba6ac936e39c53050b78bfb2c91d463d0de50d6192a41108e577e3f53b5539a5

Download Submit
memory/1792-6-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/1792-9-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/1792-7-0x0000000000C70000-0x0000000000C71000-memory.dmp

Filesize
4KB

Download
memory/4596-8-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

Filesize
84KB

Download
memory/4596-12-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

Filesize
84KB

Download
memory/4596-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

Filesize
84KB

Download
memory/4596-15-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

Filesize
84KB

Download
memory/4596-16-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

Filesize
84KB

Download
memory/4608-0-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4608-2-0x0000000000490000-0x0000000000491000-memory.dmp

Filesize
4KB

Download
memory/4608-1-0x0000000000C60000-0x0000000000C61000-memory.dmp

Filesize
4KB

Download
memory/4608-13-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download