tofsee | 514e2b4d0bdd3e933197edebb76699bf006f4b4f410e7adc491d73738c71151f

General

Target

file.exe
Size

276KB
MD5

04c62424433988aed6944dc558855824
SHA1

cb6c87d5dc521549084a92e26330340f56086f24
SHA256

514e2b4d0bdd3e933197edebb76699bf006f4b4f410e7adc491d73738c71151f
SHA512

c69cbbaa911f951b984927a9d772f043b47f157e512ffdc19d585de49af99a8a5b56944e1b34ad92906c297176909c86c9baf8a34057fe11669dcb2c344cebff
SSDEEP

3072:qJq486qfLrfPDC1tq5q6rxBWRmk821kjOzSGyCAIMuJcbP2BcWtV0ofAfpBtShIJ:R1fLbDC1nUFBOz7cgvVSpKuRjMgU

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\hpixmbje = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

cehsnhwx.exe

pid process

1356 cehsnhwx.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

700 netsh.exe

pid	process
1356	cehsnhwx.exe

pid	process
700	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\hpixmbje\ImagePath = "C:\\Windows\\SysWOW64\\hpixmbje\\cehsnhwx.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

880 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cehsnhwx.exe

description pid process target process

PID 1356 set thread context of 880 1356 cehsnhwx.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

576 sc.exe
560 sc.exe
1064 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
880	svchost.exe

description	pid	process	target process
PID 1356 set thread context of 880	1356	cehsnhwx.exe	svchost.exe

pid	process
576	sc.exe
560	sc.exe
1064	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.execehsnhwx.exe

description	pid	process	target process
PID 2016 wrote to memory of 1344	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1344	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1344	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1344	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 564	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 564	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 564	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 564	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 576	2016	file.exe	sc.exe
PID 2016 wrote to memory of 576	2016	file.exe	sc.exe
PID 2016 wrote to memory of 576	2016	file.exe	sc.exe
PID 2016 wrote to memory of 576	2016	file.exe	sc.exe
PID 2016 wrote to memory of 560	2016	file.exe	sc.exe
PID 2016 wrote to memory of 560	2016	file.exe	sc.exe
PID 2016 wrote to memory of 560	2016	file.exe	sc.exe
PID 2016 wrote to memory of 560	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1064	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1064	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1064	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1064	2016	file.exe	sc.exe
PID 2016 wrote to memory of 700	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 700	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 700	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 700	2016	file.exe	netsh.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.exe	svchost.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.exe	svchost.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.exe	svchost.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.exe	svchost.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.exe	svchost.exe
PID 1356 wrote to memory of 880	1356	cehsnhwx.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:2016

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hpixmbje\
2⤵
PID:1344

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cehsnhwx.exe" C:\Windows\SysWOW64\hpixmbje\
2⤵
PID:564

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create hpixmbje binPath= "C:\Windows\SysWOW64\hpixmbje\cehsnhwx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:576

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description hpixmbje "wifi internet conection"
2⤵
- Launches sc.exe
PID:560

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start hpixmbje
2⤵
- Launches sc.exe
PID:1064

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:700

C:\Windows\SysWOW64\hpixmbje\cehsnhwx.exe
C:\Windows\SysWOW64\hpixmbje\cehsnhwx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1356

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:880

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\cehsnhwx.exe
Filesize
10.7MB

MD5
37c4ab566a89469daea90bcf993ed60c

SHA1
9b515d3c91a14fa727710d5ae9adf5bca036f3a7

SHA256
44cd3eec5ba12599d3ecf1e9d6a0c6115e3a137aedf5e3967843b56633d1a36c

SHA512
5dda806382cb8191d14bc7329ffd3323d5fa4d7310af274de8527484dab135e0dbaf62b49d78269b1d558903eaa73278b0b2250c0f12953eefc1a8bfba3682fb

Download Submit
C:\Windows\SysWOW64\hpixmbje\cehsnhwx.exe
Filesize
10.7MB

MD5
37c4ab566a89469daea90bcf993ed60c

SHA1
9b515d3c91a14fa727710d5ae9adf5bca036f3a7

SHA256
44cd3eec5ba12599d3ecf1e9d6a0c6115e3a137aedf5e3967843b56633d1a36c

SHA512
5dda806382cb8191d14bc7329ffd3323d5fa4d7310af274de8527484dab135e0dbaf62b49d78269b1d558903eaa73278b0b2250c0f12953eefc1a8bfba3682fb

Download Submit
memory/560-62-0x0000000000000000-mapping.dmp

Download
memory/564-59-0x0000000000000000-mapping.dmp

Download
memory/576-61-0x0000000000000000-mapping.dmp

Download
memory/700-64-0x0000000000000000-mapping.dmp

Download
memory/880-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/880-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/880-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/880-73-0x0000000000089A6B-mapping.dmp

Download
memory/880-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1064-63-0x0000000000000000-mapping.dmp

Download
memory/1344-55-0x0000000000000000-mapping.dmp

Download
memory/1356-77-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/1356-75-0x00000000005BA000-0x00000000005CF000-memory.dmp

Filesize
84KB

Download
memory/2016-66-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/2016-65-0x00000000005EA000-0x00000000005FF000-memory.dmp

Filesize
84KB

Download
memory/2016-54-0x00000000757A1000-0x00000000757A3000-memory.dmp

Filesize
8KB

Download
memory/2016-58-0x0000000000400000-0x000000000044A000-memory.dmp

Filesize
296KB

Download
memory/2016-56-0x00000000005EA000-0x00000000005FF000-memory.dmp

Filesize
84KB

Download
memory/2016-57-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads