tofsee | f7e303071ac33e96d6fed2c4c97bd09acea5fdb91f2624766f89944b7ef57e91

General

Target

file.exe
Size

168KB
MD5

e743ca012be36824efeb6050c6730f28
SHA1

8abab698bf7f6a9540708789cfd1eaa3ad4b734b
SHA256

f7e303071ac33e96d6fed2c4c97bd09acea5fdb91f2624766f89944b7ef57e91
SHA512

3c186a8e2e1fa1c836517bdad14f5d8d3019c87cde94f03681394c19b82c14587e448f36ce38f7f6a2439641a61098920dac01a76957cc0f8b8bd8659203c306
SSDEEP

3072:WiWlRGF5u5tHzS5+6gdcxuvCl+iXE4NJ5SniXVSSg:SUfytH+Qv6JLXa

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
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

vlrydpti.exe

pid process

628 vlrydpti.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4840 netsh.exe

pid	process
628	vlrydpti.exe

pid	process
4840	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\mslspzaj\ImagePath = "C:\\Windows\\SysWOW64\\mslspzaj\\vlrydpti.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:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation file.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

vlrydpti.exe

description pid process target process

PID 628 set thread context of 1140 628 vlrydpti.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

476 sc.exe
4536 sc.exe
3948 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

2584 4972 WerFault.exe file.exe
1508 628 WerFault.exe vlrydpti.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.exe

description	pid	process	target process
PID 628 set thread context of 1140	628	vlrydpti.exe	svchost.exe

pid	process
476	sc.exe
4536	sc.exe
3948	sc.exe

pid	pid_target	process	target process
2584	4972	WerFault.exe	file.exe
1508	628	WerFault.exe	vlrydpti.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

file.exevlrydpti.exe

description	pid	process	target process
PID 4972 wrote to memory of 4180	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 4180	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 4180	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 3984	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 3984	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 3984	4972	file.exe	cmd.exe
PID 4972 wrote to memory of 4536	4972	file.exe	sc.exe
PID 4972 wrote to memory of 4536	4972	file.exe	sc.exe
PID 4972 wrote to memory of 4536	4972	file.exe	sc.exe
PID 4972 wrote to memory of 3948	4972	file.exe	sc.exe
PID 4972 wrote to memory of 3948	4972	file.exe	sc.exe
PID 4972 wrote to memory of 3948	4972	file.exe	sc.exe
PID 4972 wrote to memory of 476	4972	file.exe	sc.exe
PID 4972 wrote to memory of 476	4972	file.exe	sc.exe
PID 4972 wrote to memory of 476	4972	file.exe	sc.exe
PID 4972 wrote to memory of 4840	4972	file.exe	netsh.exe
PID 4972 wrote to memory of 4840	4972	file.exe	netsh.exe
PID 4972 wrote to memory of 4840	4972	file.exe	netsh.exe
PID 628 wrote to memory of 1140	628	vlrydpti.exe	svchost.exe
PID 628 wrote to memory of 1140	628	vlrydpti.exe	svchost.exe
PID 628 wrote to memory of 1140	628	vlrydpti.exe	svchost.exe
PID 628 wrote to memory of 1140	628	vlrydpti.exe	svchost.exe
PID 628 wrote to memory of 1140	628	vlrydpti.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4972

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mslspzaj\
2⤵
PID:4180

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vlrydpti.exe" C:\Windows\SysWOW64\mslspzaj\
2⤵
PID:3984

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create mslspzaj binPath= "C:\Windows\SysWOW64\mslspzaj\vlrydpti.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4536

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description mslspzaj "wifi internet conection"
2⤵
- Launches sc.exe
PID:3948

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start mslspzaj
2⤵
- Launches sc.exe
PID:476

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:4840

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4972 -s 1028
2⤵
- Program crash
PID:2584

C:\Windows\SysWOW64\mslspzaj\vlrydpti.exe
C:\Windows\SysWOW64\mslspzaj\vlrydpti.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:628

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1140

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 628 -s 552
2⤵
- Program crash
PID:1508

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4972 -ip 4972
1⤵
PID:4084

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 628 -ip 628
1⤵
PID:1604

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\vlrydpti.exe
Filesize
13.0MB

MD5
4093d7498ef543cf7c613008e3b6bbd8

SHA1
178c8b8a7484c298b110e661bd42ad2ca624a8c1

SHA256
b85c0bbc37e2ab95c6dc5637db9ba8c07f6a36b7d80780c79f59b8e380c2afc6

SHA512
02c5a6867ac59cdaad4525d5489b79ad0d62d78dd617797b0a95c1a361fd520238281f175fe278274b020da5edbd7cca7f996327f5548fc99ce0892d029409b8

Download Submit
C:\Windows\SysWOW64\mslspzaj\vlrydpti.exe
Filesize
13.0MB

MD5
4093d7498ef543cf7c613008e3b6bbd8

SHA1
178c8b8a7484c298b110e661bd42ad2ca624a8c1

SHA256
b85c0bbc37e2ab95c6dc5637db9ba8c07f6a36b7d80780c79f59b8e380c2afc6

SHA512
02c5a6867ac59cdaad4525d5489b79ad0d62d78dd617797b0a95c1a361fd520238281f175fe278274b020da5edbd7cca7f996327f5548fc99ce0892d029409b8

Download Submit
memory/476-140-0x0000000000000000-mapping.dmp

Download
memory/628-149-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/628-148-0x0000000000938000-0x0000000000949000-memory.dmp

Filesize
68KB

Download
memory/1140-144-0x0000000000000000-mapping.dmp

Download
memory/1140-145-0x00000000007B0000-0x00000000007C5000-memory.dmp

Filesize
84KB

Download
memory/1140-150-0x00000000007B0000-0x00000000007C5000-memory.dmp

Filesize
84KB

Download
memory/1140-151-0x00000000007B0000-0x00000000007C5000-memory.dmp

Filesize
84KB

Download
memory/3948-139-0x0000000000000000-mapping.dmp

Download
memory/3984-136-0x0000000000000000-mapping.dmp

Download
memory/4180-135-0x0000000000000000-mapping.dmp

Download
memory/4536-138-0x0000000000000000-mapping.dmp

Download
memory/4840-142-0x0000000000000000-mapping.dmp

Download
memory/4972-143-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/4972-132-0x00000000008CD000-0x00000000008DD000-memory.dmp

Filesize
64KB

Download
memory/4972-134-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/4972-133-0x0000000000880000-0x0000000000893000-memory.dmp

Filesize
76KB

Download

Analysis

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