tofsee | bb601ef5b3cef445b6f9eea25573ae26c8c40317278d8346fb289f283f3ebc47

General

Target

file.exe
Size

321KB
MD5

6388175964e8a802a8a33fea99990f8e
SHA1

a68f065464df424b726be370c209f47a4fb3755b
SHA256

bb601ef5b3cef445b6f9eea25573ae26c8c40317278d8346fb289f283f3ebc47
SHA512

c874f3900b47b6bd41f2275a360d7b97a0c5cf0e1df355dcfdb67c8d7e9124f646693bda305ce8d3937997b34d07de441ec7f0d16effbcb17c5524051d43c1d8
SSDEEP

6144:frLZLCRK0YQ0q1x8CweTkzZzCCyruQj9ZExaMc:DLZGRKmxVT6hCnrljCa

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\fssalgcx = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1344 netsh.exe

pid	process
1344	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\fssalgcx\ImagePath = "C:\\Windows\\SysWOW64\\fssalgcx\\wzittppm.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

924 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

wzittppm.exe

pid process

1772 wzittppm.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:

wzittppm.exe

description pid process target process

PID 1772 set thread context of 924 1772 wzittppm.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

1488 sc.exe
1728 sc.exe
840 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
924	svchost.exe

pid	process
1772	wzittppm.exe

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

description	pid	process	target process
PID 1772 set thread context of 924	1772	wzittppm.exe	svchost.exe

pid	process
1488	sc.exe
1728	sc.exe
840	sc.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 30 IoCs

Processes:

file.exewzittppm.exe

description	pid	process	target process
PID 756 wrote to memory of 2044	756	file.exe	cmd.exe
PID 756 wrote to memory of 2044	756	file.exe	cmd.exe
PID 756 wrote to memory of 2044	756	file.exe	cmd.exe
PID 756 wrote to memory of 2044	756	file.exe	cmd.exe
PID 756 wrote to memory of 1492	756	file.exe	cmd.exe
PID 756 wrote to memory of 1492	756	file.exe	cmd.exe
PID 756 wrote to memory of 1492	756	file.exe	cmd.exe
PID 756 wrote to memory of 1492	756	file.exe	cmd.exe
PID 756 wrote to memory of 1488	756	file.exe	sc.exe
PID 756 wrote to memory of 1488	756	file.exe	sc.exe
PID 756 wrote to memory of 1488	756	file.exe	sc.exe
PID 756 wrote to memory of 1488	756	file.exe	sc.exe
PID 756 wrote to memory of 1728	756	file.exe	sc.exe
PID 756 wrote to memory of 1728	756	file.exe	sc.exe
PID 756 wrote to memory of 1728	756	file.exe	sc.exe
PID 756 wrote to memory of 1728	756	file.exe	sc.exe
PID 756 wrote to memory of 840	756	file.exe	sc.exe
PID 756 wrote to memory of 840	756	file.exe	sc.exe
PID 756 wrote to memory of 840	756	file.exe	sc.exe
PID 756 wrote to memory of 840	756	file.exe	sc.exe
PID 756 wrote to memory of 1344	756	file.exe	netsh.exe
PID 756 wrote to memory of 1344	756	file.exe	netsh.exe
PID 756 wrote to memory of 1344	756	file.exe	netsh.exe
PID 756 wrote to memory of 1344	756	file.exe	netsh.exe
PID 1772 wrote to memory of 924	1772	wzittppm.exe	svchost.exe
PID 1772 wrote to memory of 924	1772	wzittppm.exe	svchost.exe
PID 1772 wrote to memory of 924	1772	wzittppm.exe	svchost.exe
PID 1772 wrote to memory of 924	1772	wzittppm.exe	svchost.exe
PID 1772 wrote to memory of 924	1772	wzittppm.exe	svchost.exe
PID 1772 wrote to memory of 924	1772	wzittppm.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:756

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fssalgcx\
2⤵
PID:2044

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wzittppm.exe" C:\Windows\SysWOW64\fssalgcx\
2⤵
PID:1492

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create fssalgcx binPath= "C:\Windows\SysWOW64\fssalgcx\wzittppm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1488

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description fssalgcx "wifi internet conection"
2⤵
- Launches sc.exe
PID:1728

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start fssalgcx
2⤵
- Launches sc.exe
PID:840

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:1344

C:\Windows\SysWOW64\fssalgcx\wzittppm.exe
C:\Windows\SysWOW64\fssalgcx\wzittppm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1772

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:924

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\wzittppm.exe
Filesize
11.5MB

MD5
e02d92508f17d3b4d14f11877d022db4

SHA1
7d23b9aa53ec7ae70ea1aff9f55e06bc79644fbb

SHA256
393e00d97b3e53ce55f57f9edde0c7d0f4f000d17b4bf71c30b46b7c83379e6c

SHA512
0b3b5d67ae836f3391e8a48f095625685e9e4670a822881d528f97541d069ebb783162e1c5709dd4ae568a3a628a41e7344dcd73d28759eacadeacaa40a3f3d2

Download Submit
C:\Windows\SysWOW64\fssalgcx\wzittppm.exe
Filesize
11.5MB

MD5
e02d92508f17d3b4d14f11877d022db4

SHA1
7d23b9aa53ec7ae70ea1aff9f55e06bc79644fbb

SHA256
393e00d97b3e53ce55f57f9edde0c7d0f4f000d17b4bf71c30b46b7c83379e6c

SHA512
0b3b5d67ae836f3391e8a48f095625685e9e4670a822881d528f97541d069ebb783162e1c5709dd4ae568a3a628a41e7344dcd73d28759eacadeacaa40a3f3d2

Download Submit
memory/756-67-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/756-55-0x000000000057C000-0x0000000000591000-memory.dmp

Filesize
84KB

Download
memory/756-56-0x0000000000230000-0x0000000000243000-memory.dmp

Filesize
76KB

Download
memory/756-57-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/756-54-0x0000000075ED1000-0x0000000075ED3000-memory.dmp

Filesize
8KB

Download
memory/756-66-0x000000000057C000-0x0000000000591000-memory.dmp

Filesize
84KB

Download
memory/840-63-0x0000000000000000-mapping.dmp

Download
memory/924-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/924-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/924-89-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/924-83-0x0000000000110000-0x0000000000116000-memory.dmp

Filesize
24KB

Download
memory/924-73-0x0000000000089A6B-mapping.dmp

Download
memory/924-86-0x0000000000140000-0x0000000000150000-memory.dmp

Filesize
64KB

Download
memory/924-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/924-80-0x0000000001970000-0x0000000001B7F000-memory.dmp

Filesize
2.1MB

Download
memory/1344-65-0x0000000000000000-mapping.dmp

Download
memory/1488-61-0x0000000000000000-mapping.dmp

Download
memory/1492-59-0x0000000000000000-mapping.dmp

Download
memory/1728-62-0x0000000000000000-mapping.dmp

Download
memory/1772-75-0x000000000028C000-0x00000000002A1000-memory.dmp

Filesize
84KB

Download
memory/1772-76-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/2044-58-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads