tofsee | 662a375950d1b16ceb51ea7d50fbaa9121f087d7d148d3be65705a2c4b8b3d08

General

Target

file.exe
Size

146KB
MD5

1fd5ff320a44cfc6d33a505c24efa590
SHA1

6db5b5667f7861e163344f95ec9f0f3616d14130
SHA256

662a375950d1b16ceb51ea7d50fbaa9121f087d7d148d3be65705a2c4b8b3d08
SHA512

83177f1f72249deaca68249ee5b2f4b755dd0481fb7b24c55f3f28183d5b54edf40f4e330bb00156210eea1f6d73414474df4f3b5b8b69cb14150d058983c29d
SSDEEP

3072:/EBurucqyxil650IRnGOamWe3BYL7aoBUSl3X:cVcqd6Bg7aj+n

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\qnbzkhed = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

gnnrscmx.exe

pid process

968 gnnrscmx.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1876 netsh.exe

pid	process
968	gnnrscmx.exe

pid	process
1876	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\qnbzkhed\ImagePath = "C:\\Windows\\SysWOW64\\qnbzkhed\\gnnrscmx.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1064 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

gnnrscmx.exe

description pid process target process

PID 968 set thread context of 1064 968 gnnrscmx.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

516 sc.exe
108 sc.exe
1360 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
1064	svchost.exe

description	pid	process	target process
PID 968 set thread context of 1064	968	gnnrscmx.exe	svchost.exe

pid	process
516	sc.exe
108	sc.exe
1360	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exegnnrscmx.exe

description	pid	process	target process
PID 1672 wrote to memory of 1552	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1552	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1552	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1552	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 628	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 628	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 628	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 628	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 516	1672	file.exe	sc.exe
PID 1672 wrote to memory of 516	1672	file.exe	sc.exe
PID 1672 wrote to memory of 516	1672	file.exe	sc.exe
PID 1672 wrote to memory of 516	1672	file.exe	sc.exe
PID 1672 wrote to memory of 108	1672	file.exe	sc.exe
PID 1672 wrote to memory of 108	1672	file.exe	sc.exe
PID 1672 wrote to memory of 108	1672	file.exe	sc.exe
PID 1672 wrote to memory of 108	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1360	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1360	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1360	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1360	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1876	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1876	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1876	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1876	1672	file.exe	netsh.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.exe	svchost.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.exe	svchost.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.exe	svchost.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.exe	svchost.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.exe	svchost.exe
PID 968 wrote to memory of 1064	968	gnnrscmx.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:1672

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qnbzkhed\
2⤵
PID:1552

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gnnrscmx.exe" C:\Windows\SysWOW64\qnbzkhed\
2⤵
PID:628

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create qnbzkhed binPath= "C:\Windows\SysWOW64\qnbzkhed\gnnrscmx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:516

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description qnbzkhed "wifi internet conection"
2⤵
- Launches sc.exe
PID:108

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start qnbzkhed
2⤵
- Launches sc.exe
PID:1360

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:1876

C:\Windows\SysWOW64\qnbzkhed\gnnrscmx.exe
C:\Windows\SysWOW64\qnbzkhed\gnnrscmx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:968

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1064

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\gnnrscmx.exe
Filesize
14.5MB

MD5
0ec4ad5e651a11dd707ee932e974e827

SHA1
2cc75805748439c86f6510dc07c01075df3527d0

SHA256
899c746077c448e72627b67b09f22f3113ddd482fb786a6a03ea856b8ce24290

SHA512
b07507bcc5ca59f3632a73bc60a412f0d365e122b28ce811e7f191685ff1eee39b4ec95836b42498bc5a0fc7d8ce5b17683e59f8d0f2eca8579f2d7920c653b2

Download Submit
C:\Windows\SysWOW64\qnbzkhed\gnnrscmx.exe
Filesize
14.5MB

MD5
0ec4ad5e651a11dd707ee932e974e827

SHA1
2cc75805748439c86f6510dc07c01075df3527d0

SHA256
899c746077c448e72627b67b09f22f3113ddd482fb786a6a03ea856b8ce24290

SHA512
b07507bcc5ca59f3632a73bc60a412f0d365e122b28ce811e7f191685ff1eee39b4ec95836b42498bc5a0fc7d8ce5b17683e59f8d0f2eca8579f2d7920c653b2

Download Submit
memory/108-62-0x0000000000000000-mapping.dmp

Download
memory/516-61-0x0000000000000000-mapping.dmp

Download
memory/628-59-0x0000000000000000-mapping.dmp

Download
memory/968-78-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/968-75-0x000000000028B000-0x000000000029C000-memory.dmp

Filesize
68KB

Download
memory/1064-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1064-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1064-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1064-73-0x0000000000089A6B-mapping.dmp

Download
memory/1064-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1360-63-0x0000000000000000-mapping.dmp

Download
memory/1552-55-0x0000000000000000-mapping.dmp

Download
memory/1672-67-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1672-66-0x00000000002EB000-0x00000000002FC000-memory.dmp

Filesize
68KB

Download
memory/1672-54-0x0000000075111000-0x0000000075113000-memory.dmp

Filesize
8KB

Download
memory/1672-56-0x00000000002EB000-0x00000000002FC000-memory.dmp

Filesize
68KB

Download
memory/1672-57-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/1672-58-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1876-65-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads