tofsee | dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963

General

Target

file.exe
Size

147KB
MD5

245a32c6b70bf744448625ca6d897a57
SHA1

67a7ca7893d555651eb6a38bc22fb9aeacffcec2
SHA256

dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963
SHA512

aa40eb9fd15e087b346086421b6efdbecc97980868d1404fa32e8ca90a118f3986aef668554ba67badf1dc58ef88c1d688ebe193fed3d3f5dd435d392d3665af
SSDEEP

3072:GFuoANbriTl655frf0zvNDoM2bTXtFW5mMSjv:JbbrHT0zxnoTeo

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\leixfwec = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

nuuyzjte.exe

pid process

1912 nuuyzjte.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1364 netsh.exe

pid	process
1912	nuuyzjte.exe

pid	process
1364	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\leixfwec\ImagePath = "C:\\Windows\\SysWOW64\\leixfwec\\nuuyzjte.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1504 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

nuuyzjte.exe

description pid process target process

PID 1912 set thread context of 1504 1912 nuuyzjte.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

592 sc.exe
1488 sc.exe
320 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1504	svchost.exe

description	pid	process	target process
PID 1912 set thread context of 1504	1912	nuuyzjte.exe	svchost.exe

pid	process
592	sc.exe
1488	sc.exe
320	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exenuuyzjte.exe

description	pid	process	target process
PID 1536 wrote to memory of 1548	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 1548	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 1548	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 1548	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 588	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 588	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 588	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 588	1536	file.exe	cmd.exe
PID 1536 wrote to memory of 592	1536	file.exe	sc.exe
PID 1536 wrote to memory of 592	1536	file.exe	sc.exe
PID 1536 wrote to memory of 592	1536	file.exe	sc.exe
PID 1536 wrote to memory of 592	1536	file.exe	sc.exe
PID 1536 wrote to memory of 1488	1536	file.exe	sc.exe
PID 1536 wrote to memory of 1488	1536	file.exe	sc.exe
PID 1536 wrote to memory of 1488	1536	file.exe	sc.exe
PID 1536 wrote to memory of 1488	1536	file.exe	sc.exe
PID 1536 wrote to memory of 320	1536	file.exe	sc.exe
PID 1536 wrote to memory of 320	1536	file.exe	sc.exe
PID 1536 wrote to memory of 320	1536	file.exe	sc.exe
PID 1536 wrote to memory of 320	1536	file.exe	sc.exe
PID 1536 wrote to memory of 1364	1536	file.exe	netsh.exe
PID 1536 wrote to memory of 1364	1536	file.exe	netsh.exe
PID 1536 wrote to memory of 1364	1536	file.exe	netsh.exe
PID 1536 wrote to memory of 1364	1536	file.exe	netsh.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe
PID 1912 wrote to memory of 1504	1912	nuuyzjte.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1536

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\leixfwec\
2⤵
PID:1548

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nuuyzjte.exe" C:\Windows\SysWOW64\leixfwec\
2⤵
PID:588

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create leixfwec binPath= "C:\Windows\SysWOW64\leixfwec\nuuyzjte.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:592

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description leixfwec "wifi internet conection"
2⤵
- Launches sc.exe
PID:1488

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start leixfwec
2⤵
- Launches sc.exe
PID:320

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:1364

C:\Windows\SysWOW64\leixfwec\nuuyzjte.exe
C:\Windows\SysWOW64\leixfwec\nuuyzjte.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1912

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1504

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nuuyzjte.exe
Filesize
12.3MB

MD5
c8b4ec719b85f3979a0dc06b1cf69f15

SHA1
9cb30412fb83620901257088171db6ac924471de

SHA256
23e7dd0bbda119d7cf9acd734c6ebdb531fb6fb3d11cea53378a56eddc8e3d98

SHA512
6231184c58262e802e4fa0850a030021eb6c1825d7aa37638d2ead5a8aa1f861a20cc68c3b611a2a5ba3f51560450ab4d4f294207b2e7e553fc694234d514c81

Download Submit
C:\Windows\SysWOW64\leixfwec\nuuyzjte.exe
Filesize
12.3MB

MD5
c8b4ec719b85f3979a0dc06b1cf69f15

SHA1
9cb30412fb83620901257088171db6ac924471de

SHA256
23e7dd0bbda119d7cf9acd734c6ebdb531fb6fb3d11cea53378a56eddc8e3d98

SHA512
6231184c58262e802e4fa0850a030021eb6c1825d7aa37638d2ead5a8aa1f861a20cc68c3b611a2a5ba3f51560450ab4d4f294207b2e7e553fc694234d514c81

Download Submit
memory/320-63-0x0000000000000000-mapping.dmp

Download
memory/588-59-0x0000000000000000-mapping.dmp

Download
memory/592-61-0x0000000000000000-mapping.dmp

Download
memory/1364-65-0x0000000000000000-mapping.dmp

Download
memory/1488-62-0x0000000000000000-mapping.dmp

Download
memory/1504-72-0x0000000000089A6B-mapping.dmp

Download
memory/1504-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1504-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1504-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1504-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1536-54-0x0000000075681000-0x0000000075683000-memory.dmp

Filesize
8KB

Download
memory/1536-67-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1536-66-0x0000000000BCB000-0x0000000000BDC000-memory.dmp

Filesize
68KB

Download
memory/1536-57-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1536-58-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1536-56-0x0000000000BCB000-0x0000000000BDC000-memory.dmp

Filesize
68KB

Download
memory/1548-55-0x0000000000000000-mapping.dmp

Download
memory/1912-75-0x000000000030B000-0x000000000031C000-memory.dmp

Filesize
68KB

Download
memory/1912-77-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads