tofsee | f7e303071ac33e96d6fed2c4c97bd09acea5fdb91f2624766f89944b7ef57e91

General

Target

file.exe
Size

168KB
MD5

e743ca012be36824efeb6050c6730f28
SHA1

8abab698bf7f6a9540708789cfd1eaa3ad4b734b
SHA256

f7e303071ac33e96d6fed2c4c97bd09acea5fdb91f2624766f89944b7ef57e91
SHA512

3c186a8e2e1fa1c836517bdad14f5d8d3019c87cde94f03681394c19b82c14587e448f36ce38f7f6a2439641a61098920dac01a76957cc0f8b8bd8659203c306
SSDEEP

3072:WiWlRGF5u5tHzS5+6gdcxuvCl+iXE4NJ5SniXVSSg:SUfytH+Qv6JLXa

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\pnollxdc = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

cfozzvvs.exe

pid process

1156 cfozzvvs.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1756 netsh.exe

pid	process
1156	cfozzvvs.exe

pid	process
1756	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\pnollxdc\ImagePath = "C:\\Windows\\SysWOW64\\pnollxdc\\cfozzvvs.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

800 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cfozzvvs.exe

description pid process target process

PID 1156 set thread context of 800 1156 cfozzvvs.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

1648 sc.exe
864 sc.exe
888 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
800	svchost.exe

description	pid	process	target process
PID 1156 set thread context of 800	1156	cfozzvvs.exe	svchost.exe

pid	process
1648	sc.exe
864	sc.exe
888	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.execfozzvvs.exe

description	pid	process	target process
PID 1672 wrote to memory of 2036	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 2036	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 2036	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 2036	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1844	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1844	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1844	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1844	1672	file.exe	cmd.exe
PID 1672 wrote to memory of 1648	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1648	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1648	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1648	1672	file.exe	sc.exe
PID 1672 wrote to memory of 864	1672	file.exe	sc.exe
PID 1672 wrote to memory of 864	1672	file.exe	sc.exe
PID 1672 wrote to memory of 864	1672	file.exe	sc.exe
PID 1672 wrote to memory of 864	1672	file.exe	sc.exe
PID 1672 wrote to memory of 888	1672	file.exe	sc.exe
PID 1672 wrote to memory of 888	1672	file.exe	sc.exe
PID 1672 wrote to memory of 888	1672	file.exe	sc.exe
PID 1672 wrote to memory of 888	1672	file.exe	sc.exe
PID 1672 wrote to memory of 1756	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1756	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1756	1672	file.exe	netsh.exe
PID 1672 wrote to memory of 1756	1672	file.exe	netsh.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.exe	svchost.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.exe	svchost.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.exe	svchost.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.exe	svchost.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.exe	svchost.exe
PID 1156 wrote to memory of 800	1156	cfozzvvs.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\pnollxdc\
2⤵
PID:2036

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cfozzvvs.exe" C:\Windows\SysWOW64\pnollxdc\
2⤵
PID:1844

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create pnollxdc binPath= "C:\Windows\SysWOW64\pnollxdc\cfozzvvs.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1648

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description pnollxdc "wifi internet conection"
2⤵
- Launches sc.exe
PID:864

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start pnollxdc
2⤵
- Launches sc.exe
PID:888

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:1756

C:\Windows\SysWOW64\pnollxdc\cfozzvvs.exe
C:\Windows\SysWOW64\pnollxdc\cfozzvvs.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1156

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:800

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\cfozzvvs.exe
Filesize
10.3MB

MD5
e3d8b57acef5606ea78b317dc0625120

SHA1
c53f2484957e3aeb2a6686e1a36d3c256d3f9021

SHA256
22141a27175335049dcb4642d57b97bd4643893d7480a54f3852b8f30d99611e

SHA512
eb3339789ea4b754d7610ced858c010d59f819c6151241d4637b5bdd467d58f6c7d535040114c85677032c8d644735217efe44bb2a476c451c55a66474480b69

Download Submit
C:\Windows\SysWOW64\pnollxdc\cfozzvvs.exe
Filesize
10.3MB

MD5
e3d8b57acef5606ea78b317dc0625120

SHA1
c53f2484957e3aeb2a6686e1a36d3c256d3f9021

SHA256
22141a27175335049dcb4642d57b97bd4643893d7480a54f3852b8f30d99611e

SHA512
eb3339789ea4b754d7610ced858c010d59f819c6151241d4637b5bdd467d58f6c7d535040114c85677032c8d644735217efe44bb2a476c451c55a66474480b69

Download Submit
memory/800-78-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/800-72-0x0000000000089A6B-mapping.dmp

Download
memory/800-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/800-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/800-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/864-62-0x0000000000000000-mapping.dmp

Download
memory/888-63-0x0000000000000000-mapping.dmp

Download
memory/1156-80-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1156-74-0x0000000000B6B000-0x0000000000B7C000-memory.dmp

Filesize
68KB

Download
memory/1156-76-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1648-61-0x0000000000000000-mapping.dmp

Download
memory/1672-54-0x0000000075BD1000-0x0000000075BD3000-memory.dmp

Filesize
8KB

Download
memory/1672-65-0x00000000008AB000-0x00000000008BC000-memory.dmp

Filesize
68KB

Download
memory/1672-66-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1672-57-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1672-55-0x00000000008AB000-0x00000000008BC000-memory.dmp

Filesize
68KB

Download
memory/1672-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1756-64-0x0000000000000000-mapping.dmp

Download
memory/1844-59-0x0000000000000000-mapping.dmp

Download
memory/2036-58-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads