tofsee | b36c42fd589f6eeacc8f5b4fb21b37c4eef8bd1a8a8a737d8e7e8d09f9f6e1dd

General

Target

f14a46d2d5535867d84aa11fa8ae5c2c.exe
Size

10.2MB
MD5

f14a46d2d5535867d84aa11fa8ae5c2c
SHA1

39d19968f1106dae2917f838e15643ed2fba35ef
SHA256

b36c42fd589f6eeacc8f5b4fb21b37c4eef8bd1a8a8a737d8e7e8d09f9f6e1dd
SHA512

0b7c5a97747333358cd41631c178f4810b54287e6516950f82e933e9909c3d66809d291985ed4d53b68920d9fba84bd9f7721b1ba80f96ce88668debf608df2b

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

ribelykj.exe

pid process

3612 ribelykj.exe
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031
Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112
Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

3452 svchost.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ribelykj.exe

description pid process target process

PID 3612 set thread context of 3452 3612 ribelykj.exe svchost.exe
Launches sc.exe
Sc.exe is a Windows utlilty to control services on the system.

pid	process
3612	ribelykj.exe

pid	process
3452	svchost.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 3612 set thread context of 3452	3612	ribelykj.exe	svchost.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

f14a46d2d5535867d84aa11fa8ae5c2c.exeribelykj.exe

description	pid	process	target process
PID 492 wrote to memory of 3676	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 3676	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 3676	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 3028	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 3028	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 3028	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	cmd.exe
PID 492 wrote to memory of 4076	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 4076	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 4076	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2012	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2012	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2012	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2232	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2232	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 2232	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	sc.exe
PID 492 wrote to memory of 3288	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	netsh.exe
PID 492 wrote to memory of 3288	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	netsh.exe
PID 492 wrote to memory of 3288	492	f14a46d2d5535867d84aa11fa8ae5c2c.exe	netsh.exe
PID 3612 wrote to memory of 3452	3612	ribelykj.exe	svchost.exe
PID 3612 wrote to memory of 3452	3612	ribelykj.exe	svchost.exe
PID 3612 wrote to memory of 3452	3612	ribelykj.exe	svchost.exe
PID 3612 wrote to memory of 3452	3612	ribelykj.exe	svchost.exe
PID 3612 wrote to memory of 3452	3612	ribelykj.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\f14a46d2d5535867d84aa11fa8ae5c2c.exe
"C:\Users\Admin\AppData\Local\Temp\f14a46d2d5535867d84aa11fa8ae5c2c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:492

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cgwnbrfw\
2⤵
PID:3676

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ribelykj.exe" C:\Windows\SysWOW64\cgwnbrfw\
2⤵
PID:3028

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create cgwnbrfw binPath= "C:\Windows\SysWOW64\cgwnbrfw\ribelykj.exe /d\"C:\Users\Admin\AppData\Local\Temp\f14a46d2d5535867d84aa11fa8ae5c2c.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
PID:4076

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description cgwnbrfw "wifi internet conection"
2⤵
PID:2012

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start cgwnbrfw
2⤵
PID:2232

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⤵
PID:3288

C:\Windows\SysWOW64\cgwnbrfw\ribelykj.exe
C:\Windows\SysWOW64\cgwnbrfw\ribelykj.exe /d"C:\Users\Admin\AppData\Local\Temp\f14a46d2d5535867d84aa11fa8ae5c2c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3612

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:3452

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

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ribelykj.exe
MD5
5618ef4ed0d65b80536162deaa96932e

SHA1
6587dd8469c5adc1a86c1dcb6053eabf61c6fe4b

SHA256
d0c4c0038876c9a307bac2ddd5f549e0712a1633ff639692026adc72e8ff50a8

SHA512
c058ee7e47eb5f9c75160a35f99ba35623e4ccbb22f396cb038e070ff73a827842e9d41a8212c065c8ab22e92fa0b83a63c66fab7d188ef293e81e1eeb18ee24

Download Submit
C:\Windows\SysWOW64\cgwnbrfw\ribelykj.exe
MD5
5618ef4ed0d65b80536162deaa96932e

SHA1
6587dd8469c5adc1a86c1dcb6053eabf61c6fe4b

SHA256
d0c4c0038876c9a307bac2ddd5f549e0712a1633ff639692026adc72e8ff50a8

SHA512
c058ee7e47eb5f9c75160a35f99ba35623e4ccbb22f396cb038e070ff73a827842e9d41a8212c065c8ab22e92fa0b83a63c66fab7d188ef293e81e1eeb18ee24

Download Submit
memory/2012-6-0x0000000000000000-mapping.dmp

Download
memory/2232-7-0x0000000000000000-mapping.dmp

Download
memory/3028-3-0x0000000000000000-mapping.dmp

Download
memory/3288-8-0x0000000000000000-mapping.dmp

Download
memory/3452-10-0x0000000000370000-0x0000000000385000-memory.dmp

Filesize
84KB

Download
memory/3452-11-0x0000000000379A6B-mapping.dmp

Download
memory/3676-2-0x0000000000000000-mapping.dmp

Download
memory/4076-5-0x0000000000000000-mapping.dmp

Download

Analysis

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