tofsee | 81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
23-11-2024 12:53

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General

Target

81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe
Size

13.7MB
MD5

5f46e1a9a454e6f44e49c0c81ee26a79
SHA1

7cb18cae342b9e49b6aa12af1ab1d6d953f6f315
SHA256

81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b
SHA512

f4777321413ad062eba356fb73c2ffc1e01121e2c8d0bd5a7a3d2f2dc6fd36b7405e19d65275fe637e7a0dc8568e7196e26f19ae4913377400ef9c132b5dbae6
SSDEEP

49152:H77777777777777777777777777777777777777777777777777777777777777U:E

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

quadoil.ru

lakeflex.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Tofsee family
tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\ysswjwcr = "0"	svchost.exe

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

pid	Process
2860	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\ysswjwcr\ImagePath = "C:\\Windows\\SysWOW64\\ysswjwcr\\dnsfmhgv.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2472	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2692	dnsfmhgv.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2692 set thread context of 2472	2692	dnsfmhgv.exe	43

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
2824	sc.exe
2780	sc.exe
2876	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

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

System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	dnsfmhgv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2856 wrote to memory of 2672	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	30
PID 2856 wrote to memory of 2672	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	30
PID 2856 wrote to memory of 2672	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	30
PID 2856 wrote to memory of 2672	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	30
PID 2856 wrote to memory of 2844	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	32
PID 2856 wrote to memory of 2844	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	32
PID 2856 wrote to memory of 2844	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	32
PID 2856 wrote to memory of 2844	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	32
PID 2856 wrote to memory of 2824	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	34
PID 2856 wrote to memory of 2824	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	34
PID 2856 wrote to memory of 2824	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	34
PID 2856 wrote to memory of 2824	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	34
PID 2856 wrote to memory of 2780	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	36
PID 2856 wrote to memory of 2780	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	36
PID 2856 wrote to memory of 2780	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	36
PID 2856 wrote to memory of 2780	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	36
PID 2856 wrote to memory of 2876	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	38
PID 2856 wrote to memory of 2876	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	38
PID 2856 wrote to memory of 2876	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	38
PID 2856 wrote to memory of 2876	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	38
PID 2856 wrote to memory of 2860	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	41
PID 2856 wrote to memory of 2860	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	41
PID 2856 wrote to memory of 2860	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	41
PID 2856 wrote to memory of 2860	2856	81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe	41
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43
PID 2692 wrote to memory of 2472	2692	dnsfmhgv.exe	43

C:\Users\Admin\AppData\Local\Temp\81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe
"C:\Users\Admin\AppData\Local\Temp\81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2856
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ysswjwcr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2672
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dnsfmhgv.exe" C:\Windows\SysWOW64\ysswjwcr\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ysswjwcr binPath= "C:\Windows\SysWOW64\ysswjwcr\dnsfmhgv.exe /d\"C:\Users\Admin\AppData\Local\Temp\81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2824
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ysswjwcr "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2780
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ysswjwcr
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2876
- 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
  - System Location Discovery: System Language Discovery
  PID:2860

C:\Windows\SysWOW64\ysswjwcr\dnsfmhgv.exe
C:\Windows\SysWOW64\ysswjwcr\dnsfmhgv.exe /d"C:\Users\Admin\AppData\Local\Temp\81de39e7c4edad66037f5b8e4965542d7aa4b2318459735f6ec490a1637fda0b.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2692
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2472

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
12.9MB

MD5
fb8db9b89d2a3e2c4c54c782da9755de

SHA1
2ea52c5e92d9fd6aa294094628ecebd25a39df69

SHA256
999e5d8ff05759f6652e3e124f496f21cdb4286531728edcfdfda6e39fde1a8e

SHA512
ad56abf92f47ff146b211e01639ccdb2921b45a69e31188e6b14dc74bf7b015d13ef3d214aa633b3b28a076a8780e501195ad40d98be9834eba9eda3dad17e0e

Download Submit
memory/2472-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2472-16-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2472-14-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2472-11-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2472-18-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2692-17-0x0000000000400000-0x00000000016BC000-memory.dmp

Filesize
18.7MB

Download
memory/2856-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2856-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2856-9-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2856-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2856-8-0x0000000000400000-0x00000000016BC000-memory.dmp

Filesize
18.7MB

Download
memory/2856-1-0x00000000002D0000-0x00000000003D0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads