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
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

hgfghrtw.exe

pid process

4428 hgfghrtw.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

720 netsh.exe

pid	process
4428	hgfghrtw.exe

pid	process
720	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\bktivqhy\ImagePath = "C:\\Windows\\SysWOW64\\bktivqhy\\hgfghrtw.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation file.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:

hgfghrtw.exe

description pid process target process

PID 4428 set thread context of 4752 4428 hgfghrtw.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

4820 sc.exe
4252 sc.exe
4692 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

2336 2264 WerFault.exe file.exe
712 4428 WerFault.exe hgfghrtw.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	file.exe

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

description	pid	process	target process
PID 4428 set thread context of 4752	4428	hgfghrtw.exe	svchost.exe

pid	process
4820	sc.exe
4252	sc.exe
4692	sc.exe

pid	pid_target	process	target process
2336	2264	WerFault.exe	file.exe
712	4428	WerFault.exe	hgfghrtw.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:

file.exehgfghrtw.exe

description	pid	process	target process
PID 2264 wrote to memory of 1432	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 1432	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 1432	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 4976	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 4976	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 4976	2264	file.exe	cmd.exe
PID 2264 wrote to memory of 4692	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4692	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4692	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4820	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4820	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4820	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4252	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4252	2264	file.exe	sc.exe
PID 2264 wrote to memory of 4252	2264	file.exe	sc.exe
PID 2264 wrote to memory of 720	2264	file.exe	netsh.exe
PID 2264 wrote to memory of 720	2264	file.exe	netsh.exe
PID 2264 wrote to memory of 720	2264	file.exe	netsh.exe
PID 4428 wrote to memory of 4752	4428	hgfghrtw.exe	svchost.exe
PID 4428 wrote to memory of 4752	4428	hgfghrtw.exe	svchost.exe
PID 4428 wrote to memory of 4752	4428	hgfghrtw.exe	svchost.exe
PID 4428 wrote to memory of 4752	4428	hgfghrtw.exe	svchost.exe
PID 4428 wrote to memory of 4752	4428	hgfghrtw.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:2264

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bktivqhy\
2⤵
PID:1432

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hgfghrtw.exe" C:\Windows\SysWOW64\bktivqhy\
2⤵
PID:4976

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create bktivqhy binPath= "C:\Windows\SysWOW64\bktivqhy\hgfghrtw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4692

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description bktivqhy "wifi internet conection"
2⤵
- Launches sc.exe
PID:4820

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start bktivqhy
2⤵
- Launches sc.exe
PID:4252

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:720

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2264 -s 1040
2⤵
- Program crash
PID:2336

C:\Windows\SysWOW64\bktivqhy\hgfghrtw.exe
C:\Windows\SysWOW64\bktivqhy\hgfghrtw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4428

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:4752

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4428 -s 512
2⤵
- Program crash
PID:712

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2264 -ip 2264
1⤵
PID:4588

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 4428 -ip 4428
1⤵
PID:2240

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\hgfghrtw.exe
Filesize
14.2MB

MD5
7f0fdd01eb95c7cf67d4cf575a295529

SHA1
3f53213ae6de4930f13de4596780f65d60eab825

SHA256
1ccba90c8031ce7e34eb115d0e13854d0ad67da558c7262ff3faef8c5da929cd

SHA512
36743406bb99c181b90d05f02bfcdfbaac6cb1beddce9a6a70b35b2ee6d3f9412dd5cb667f5328b08d9a3a72fe51aa6a7a728c201402b091bcb5a96637762a5d

Download Submit
C:\Windows\SysWOW64\bktivqhy\hgfghrtw.exe
Filesize
14.2MB

MD5
7f0fdd01eb95c7cf67d4cf575a295529

SHA1
3f53213ae6de4930f13de4596780f65d60eab825

SHA256
1ccba90c8031ce7e34eb115d0e13854d0ad67da558c7262ff3faef8c5da929cd

SHA512
36743406bb99c181b90d05f02bfcdfbaac6cb1beddce9a6a70b35b2ee6d3f9412dd5cb667f5328b08d9a3a72fe51aa6a7a728c201402b091bcb5a96637762a5d

Download Submit
memory/720-142-0x0000000000000000-mapping.dmp

Download
memory/1432-135-0x0000000000000000-mapping.dmp

Download
memory/2264-143-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2264-133-0x0000000000C40000-0x0000000000C53000-memory.dmp

Filesize
76KB

Download
memory/2264-134-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/2264-132-0x0000000000DAD000-0x0000000000DBE000-memory.dmp

Filesize
68KB

Download
memory/4252-140-0x0000000000000000-mapping.dmp

Download
memory/4428-149-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/4692-138-0x0000000000000000-mapping.dmp

Download
memory/4752-145-0x0000000000000000-mapping.dmp

Download
memory/4752-146-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/4752-150-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/4752-151-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/4820-139-0x0000000000000000-mapping.dmp

Download
memory/4976-136-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads