tofsee | accf3e9fbd47c991968f035df3bfde01beddbb1dbcd667bd13dad9c52c18e17c

General

Target

b355dc0b186600b6812852aaba586ad3.exe
Size

14.9MB
MD5

b355dc0b186600b6812852aaba586ad3
SHA1

c4cfb0e6073a520bb06bf442b322a1cc3f30b8f5
SHA256

accf3e9fbd47c991968f035df3bfde01beddbb1dbcd667bd13dad9c52c18e17c
SHA512

67cc9bcd4ab5703d2be50986a875d412cb4446b5b277c32b596bc386d13eaa1b1ffb85cc4a85ff7d85d15c5dac4048823f011c6cb3586bfcfe390d3a78d73ef5

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:

uqkqwyqh.exe

pid process

1316 uqkqwyqh.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

2748 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:

uqkqwyqh.exe

description pid process target process

PID 1316 set thread context of 2748 1316 uqkqwyqh.exe svchost.exe
Launches sc.exe
Sc.exe is a Windows utlilty to control services on the system.

pid	process
1316	uqkqwyqh.exe

pid	process
2748	svchost.exe

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

description	pid	process	target process
PID 1316 set thread context of 2748	1316	uqkqwyqh.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:

b355dc0b186600b6812852aaba586ad3.exeuqkqwyqh.exe

description	pid	process	target process
PID 4004 wrote to memory of 2244	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 2244	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 2244	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 3084	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 3084	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 3084	4004	b355dc0b186600b6812852aaba586ad3.exe	cmd.exe
PID 4004 wrote to memory of 3856	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 3856	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 3856	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1240	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1240	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1240	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1956	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1956	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 4004 wrote to memory of 1956	4004	b355dc0b186600b6812852aaba586ad3.exe	sc.exe
PID 1316 wrote to memory of 2748	1316	uqkqwyqh.exe	svchost.exe
PID 1316 wrote to memory of 2748	1316	uqkqwyqh.exe	svchost.exe
PID 1316 wrote to memory of 2748	1316	uqkqwyqh.exe	svchost.exe
PID 1316 wrote to memory of 2748	1316	uqkqwyqh.exe	svchost.exe
PID 1316 wrote to memory of 2748	1316	uqkqwyqh.exe	svchost.exe
PID 4004 wrote to memory of 1128	4004	b355dc0b186600b6812852aaba586ad3.exe	netsh.exe
PID 4004 wrote to memory of 1128	4004	b355dc0b186600b6812852aaba586ad3.exe	netsh.exe
PID 4004 wrote to memory of 1128	4004	b355dc0b186600b6812852aaba586ad3.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\b355dc0b186600b6812852aaba586ad3.exe
"C:\Users\Admin\AppData\Local\Temp\b355dc0b186600b6812852aaba586ad3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4004

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nyxdnjbj\
2⤵
PID:2244

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uqkqwyqh.exe" C:\Windows\SysWOW64\nyxdnjbj\
2⤵
PID:3084

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create nyxdnjbj binPath= "C:\Windows\SysWOW64\nyxdnjbj\uqkqwyqh.exe /d\"C:\Users\Admin\AppData\Local\Temp\b355dc0b186600b6812852aaba586ad3.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
PID:3856

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description nyxdnjbj "wifi internet conection"
2⤵
PID:1240

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start nyxdnjbj
2⤵
PID:1956

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:1128

C:\Windows\SysWOW64\nyxdnjbj\uqkqwyqh.exe
C:\Windows\SysWOW64\nyxdnjbj\uqkqwyqh.exe /d"C:\Users\Admin\AppData\Local\Temp\b355dc0b186600b6812852aaba586ad3.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1316

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2748

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

Disabling Security Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

MD5
4cb1fef36fa507a127bc71fda343cb19

SHA1
d811e61da57ca2c3de5c5b5d3921d47d10c47b5b

SHA256
ce1c0011859c73317defb5f42bf65f33a579d80c991fe54fa851eef0cd7f185d

SHA512
52acdec89d9b2b6e3e81f174dda8c812605ea7c8efb23c643a0537fa74ae84933cf7190fafd41122d5314dee1b3f249c1ff6ced8891eb066825ca0162df14308

Download Submit
C:\Windows\SysWOW64\nyxdnjbj\uqkqwyqh.exe

MD5
4cb1fef36fa507a127bc71fda343cb19

SHA1
d811e61da57ca2c3de5c5b5d3921d47d10c47b5b

SHA256
ce1c0011859c73317defb5f42bf65f33a579d80c991fe54fa851eef0cd7f185d

SHA512
52acdec89d9b2b6e3e81f174dda8c812605ea7c8efb23c643a0537fa74ae84933cf7190fafd41122d5314dee1b3f249c1ff6ced8891eb066825ca0162df14308

Download Submit
memory/1128-12-0x0000000000000000-mapping.dmp

Download
memory/1240-6-0x0000000000000000-mapping.dmp

Download
memory/1956-7-0x0000000000000000-mapping.dmp

Download
memory/2244-2-0x0000000000000000-mapping.dmp

Download
memory/2748-9-0x0000000002C90000-0x0000000002CA5000-memory.dmp

Filesize
84KB

Download
memory/2748-10-0x0000000002C99A6B-mapping.dmp

Download
memory/3084-3-0x0000000000000000-mapping.dmp

Download
memory/3856-5-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing