tofsee | 0c2e01cf79746b2f2824d9f39dc28a5b28a36ea0d3866395ad8ed30e961e7ad1

General

Target

file.exe
Size

322KB
MD5

47446aab4c244063fa5b4852650093e0
SHA1

383d4023a79edd924cad180666ea969613fdec4d
SHA256

0c2e01cf79746b2f2824d9f39dc28a5b28a36ea0d3866395ad8ed30e961e7ad1
SHA512

f28183ad13ca4c9bd79d11e18779f2a4cf6ed3500f0ca5015443a4b075a87090d2f008ee8d4b980eca396f99b580cae371085137ca69d4df75c4194a46e48c4f
SSDEEP

3072:qfz6kXLWSkKDRKs8SgL8ZridHKS7WALXQSYC1//+sxA7rNAMV+v3:eHLLkKYs8SxrGHzqcYClRkM

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\mfafyzxa = "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

968 netsh.exe

pid	process
968	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\mfafyzxa\ImagePath = "C:\\Windows\\SysWOW64\\mfafyzxa\\ysizcadm.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1544 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

ysizcadm.exe

pid process

1168 ysizcadm.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:

ysizcadm.exe

description pid process target process

PID 1168 set thread context of 1544 1168 ysizcadm.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

1808 sc.exe
924 sc.exe
1480 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
1544	svchost.exe

pid	process
1168	ysizcadm.exe

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

description	pid	process	target process
PID 1168 set thread context of 1544	1168	ysizcadm.exe	svchost.exe

pid	process
1808	sc.exe
924	sc.exe
1480	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.exeysizcadm.exe

description	pid	process	target process
PID 1584 wrote to memory of 1444	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 1444	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 1444	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 1444	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 868	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 868	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 868	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 868	1584	file.exe	cmd.exe
PID 1584 wrote to memory of 1480	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1480	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1480	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1480	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1808	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1808	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1808	1584	file.exe	sc.exe
PID 1584 wrote to memory of 1808	1584	file.exe	sc.exe
PID 1584 wrote to memory of 924	1584	file.exe	sc.exe
PID 1584 wrote to memory of 924	1584	file.exe	sc.exe
PID 1584 wrote to memory of 924	1584	file.exe	sc.exe
PID 1584 wrote to memory of 924	1584	file.exe	sc.exe
PID 1584 wrote to memory of 968	1584	file.exe	netsh.exe
PID 1584 wrote to memory of 968	1584	file.exe	netsh.exe
PID 1584 wrote to memory of 968	1584	file.exe	netsh.exe
PID 1584 wrote to memory of 968	1584	file.exe	netsh.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.exe	svchost.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.exe	svchost.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.exe	svchost.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.exe	svchost.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.exe	svchost.exe
PID 1168 wrote to memory of 1544	1168	ysizcadm.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:1584

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mfafyzxa\
2⤵
PID:1444

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ysizcadm.exe" C:\Windows\SysWOW64\mfafyzxa\
2⤵
PID:868

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create mfafyzxa binPath= "C:\Windows\SysWOW64\mfafyzxa\ysizcadm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1480

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description mfafyzxa "wifi internet conection"
2⤵
- Launches sc.exe
PID:1808

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start mfafyzxa
2⤵
- Launches sc.exe
PID:924

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:968

C:\Windows\SysWOW64\mfafyzxa\ysizcadm.exe
C:\Windows\SysWOW64\mfafyzxa\ysizcadm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1168

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:1544

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\ysizcadm.exe
Filesize
10.4MB

MD5
73e92b5c92c54eb663de0a8095479877

SHA1
639e68b399104add4d690f188ae414b4d16ae6a8

SHA256
7bd0de378d30d7e0f37ec39900751813c3ed61d6301190c95211ec60b6826b0d

SHA512
e7f4078a6233a53ef5473658e152918092b1bb7f7cf0bd23d778aa06f655f84d6ac92ed4651cc038e054b36738919ad160a8e012bbb0dbd1e5432989e87681c8

Download Submit
C:\Windows\SysWOW64\mfafyzxa\ysizcadm.exe
Filesize
10.4MB

MD5
73e92b5c92c54eb663de0a8095479877

SHA1
639e68b399104add4d690f188ae414b4d16ae6a8

SHA256
7bd0de378d30d7e0f37ec39900751813c3ed61d6301190c95211ec60b6826b0d

SHA512
e7f4078a6233a53ef5473658e152918092b1bb7f7cf0bd23d778aa06f655f84d6ac92ed4651cc038e054b36738919ad160a8e012bbb0dbd1e5432989e87681c8

Download Submit
memory/868-56-0x0000000000000000-mapping.dmp

Download
memory/924-63-0x0000000000000000-mapping.dmp

Download
memory/968-65-0x0000000000000000-mapping.dmp

Download
memory/1168-79-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1168-77-0x000000000060C000-0x0000000000621000-memory.dmp

Filesize
84KB

Download
memory/1168-70-0x000000000060C000-0x0000000000621000-memory.dmp

Filesize
84KB

Download
memory/1168-71-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1444-55-0x0000000000000000-mapping.dmp

Download
memory/1480-61-0x0000000000000000-mapping.dmp

Download
memory/1544-74-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1544-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1544-82-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1544-75-0x0000000000089A6B-mapping.dmp

Download
memory/1544-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1584-67-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1584-58-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1584-66-0x000000000051C000-0x0000000000531000-memory.dmp

Filesize
84KB

Download
memory/1584-59-0x0000000000400000-0x000000000046B000-memory.dmp

Filesize
428KB

Download
memory/1584-54-0x0000000075491000-0x0000000075493000-memory.dmp

Filesize
8KB

Download
memory/1584-57-0x000000000051C000-0x0000000000531000-memory.dmp

Filesize
84KB

Download
memory/1808-62-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads