tofsee | af96fba4513a6d11f13b862c0dce4e732396ad9459ae0e9c1169d10a64ee3dec

General

Target

3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe
Size

12.1MB
MD5

702446058f451ba7dc24f6c803c2cde0
SHA1

bf3a9ba6eba9b010f73b40e14af10665468726a0
SHA256

3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5
SHA512

d66c491708c746ed590d7394dd33b466bfec6e65268426af6996042335e9f256d6029f26434312bf401997d7bbba22688540d1a6066536c80894ce89b5d7ae43
SSDEEP

3072:iaph+Lu/fY1fiDxf3AC0Rio+jbtocBO4Ie54I3swQ3swQ3swQ3swQ3swQ3swQ3s8:iG+Lu/fMaDNYizjbQ

Score

10^/10

tofsee evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

960 netsh.exe

pid	process
960	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\btvavol\ImagePath = "C:\\Windows\\SysWOW64\\btvavol\\ndzojbzh.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

660 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

ndzojbzh.exe

pid process

3264 ndzojbzh.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ndzojbzh.exe

description pid process target process

PID 3264 set thread context of 660 3264 ndzojbzh.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

3396 sc.exe
1236 sc.exe
4348 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
660	svchost.exe

pid	process
3264	ndzojbzh.exe

description	pid	process	target process
PID 3264 set thread context of 660	3264	ndzojbzh.exe	svchost.exe

pid	process
3396	sc.exe
1236	sc.exe
4348	sc.exe

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

Processes:

netsh.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
904	3264	WerFault.exe	ndzojbzh.exe
4920	4540	WerFault.exe	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exendzojbzh.exe

description	pid	process	target process
PID 4540 wrote to memory of 4464	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 4464	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 4464	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 3936	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 3936	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 3936	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	cmd.exe
PID 4540 wrote to memory of 4348	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 4348	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 4348	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 3396	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 3396	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 3396	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 1236	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 1236	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 4540 wrote to memory of 1236	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	sc.exe
PID 3264 wrote to memory of 660	3264	ndzojbzh.exe	svchost.exe
PID 3264 wrote to memory of 660	3264	ndzojbzh.exe	svchost.exe
PID 3264 wrote to memory of 660	3264	ndzojbzh.exe	svchost.exe
PID 3264 wrote to memory of 660	3264	ndzojbzh.exe	svchost.exe
PID 3264 wrote to memory of 660	3264	ndzojbzh.exe	svchost.exe
PID 4540 wrote to memory of 960	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	netsh.exe
PID 4540 wrote to memory of 960	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	netsh.exe
PID 4540 wrote to memory of 960	4540	3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe
"C:\Users\Admin\AppData\Local\Temp\3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4540

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\btvavol\
2⤵
PID:4464

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ndzojbzh.exe" C:\Windows\SysWOW64\btvavol\
2⤵
PID:3936

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create btvavol binPath= "C:\Windows\SysWOW64\btvavol\ndzojbzh.exe /d\"C:\Users\Admin\AppData\Local\Temp\3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4348

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description btvavol "wifi internet conection"
2⤵
- Launches sc.exe
PID:3396

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start btvavol
2⤵
- Launches sc.exe
PID:1236

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
- Event Triggered Execution: Netsh Helper DLL
PID:960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4540 -s 572
2⤵
- Program crash
PID:4920

C:\Windows\SysWOW64\btvavol\ndzojbzh.exe
C:\Windows\SysWOW64\btvavol\ndzojbzh.exe /d"C:\Users\Admin\AppData\Local\Temp\3af14f6a815a984317ed01bfe46fd4df0070bce770aaa54bc55cc626831112a5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3264

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Deletes itself
PID:660

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3264 -s 516
2⤵
- Program crash
PID:904

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3264 -ip 3264
1⤵
PID:100

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 4540 -ip 4540
1⤵
PID:4244

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\ndzojbzh.exe

Filesize
11.0MB

MD5
88f52fb30cf04171a13f178c04bfdeba

SHA1
3f7e5fdacdb1748ec699403a65cabbd918782107

SHA256
598ef814d1f64c25acd2d26d6429e1e3ae74cb08f3d9d8d3cf03037d8bfc0438

SHA512
d08348926c46ec1f7cde726e503d8bdd1c3c2b5817a5b8e58e810d80a0d09c4157bca1f402ea663dc29547d94a740ce2dc72fb086c1ed72d4fd441862158038a

Download Submit
memory/660-7-0x0000000000550000-0x0000000000565000-memory.dmp

Filesize
84KB

Download
memory/660-12-0x0000000000550000-0x0000000000565000-memory.dmp

Filesize
84KB

Download
memory/660-13-0x0000000000550000-0x0000000000565000-memory.dmp

Filesize
84KB

Download
memory/3264-9-0x0000000000400000-0x0000000001BB5000-memory.dmp

Filesize
23.7MB

Download
memory/4540-2-0x0000000000400000-0x0000000001BB5000-memory.dmp

Filesize
23.7MB

Download
memory/4540-3-0x0000000000400000-0x0000000001BB5000-memory.dmp

Filesize
23.7MB

Download
memory/4540-11-0x0000000000400000-0x0000000001BB5000-memory.dmp

Filesize
23.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads