tofsee | 4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c

General

Target
4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe
Size 12.6MB
Sample261113-dtxfpszt5k
SHA256 4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c
MD5 01489e25794870b4db7673184b29ffb4
SHA1 0231ee9136c94f167e05c4901a78c2d99193fc79
SHA512 1e2555031931a9c6f8db118617fb129316b42b8b0bf803666fe165129fba8510f0043f987e19df8915afa25722b235a979a98209c56ecac1ab5c9174108c325f
SSDEEP 49152:GKpbWrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvn:GO
TLSH
T14ED641AA76BA5ED6D08A0B3C0CB1D5174EACF634083A597251D140CF58EE2CAD73CBB5
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution tofsee persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru
refabyd.info

Signatures

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

Modifies Windows Firewall 2 TTPs 1 IoCs

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
1084	netsh.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Executes dropped EXE 1 IoCs

pid	Process
3000	sezwdccq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3000 set thread context of 5792	3000	sezwdccq.exe	103

Launches sc.exe 3 IoCs

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

pid	Process
1232	sc.exe
3856	sc.exe
6084	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

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4160	cmd.exe
5852	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 8 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	sezwdccq.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.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	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1340 wrote to memory of 4160	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	91
PID 1340 wrote to memory of 5852	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	93
PID 1340 wrote to memory of 1232	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	95
PID 1340 wrote to memory of 3856	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	97
PID 1340 wrote to memory of 6084	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	99
PID 3000 wrote to memory of 5792	3000	sezwdccq.exe	103
PID 3000 wrote to memory of 5792	3000	sezwdccq.exe	103
PID 1340 wrote to memory of 1084	1340	4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe	104

C:\Users\Admin\AppData\Local\Temp\4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe
"C:\Users\Admin\AppData\Local\Temp\4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1340
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\izfqifjv\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4160
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sezwdccq.exe" C:\Windows\SysWOW64\izfqifjv\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5852
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create izfqifjv binPath= "C:\Windows\SysWOW64\izfqifjv\sezwdccq.exe /d\"C:\Users\Admin\AppData\Local\Temp\4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1232
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description izfqifjv "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3856
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start izfqifjv
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:6084
- 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:1084

C:\Windows\SysWOW64\izfqifjv\sezwdccq.exe
C:\Windows\SysWOW64\izfqifjv\sezwdccq.exe /d"C:\Users\Admin\AppData\Local\Temp\4d660290171a05e3baebf9a31a6a839f1803b592e60555d01685b4a961e9631c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3000
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:5792

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

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

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

1

T1562.004

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

sezwdccq.exe

Path C:\Users\Admin\AppData\Local\Temp\sezwdccq.exe
Size 11.1MB
SHA256 4a73545767a43f84ac9a5cfac9ea847644f432040162025918f7424510ad8974
MD5 28962fecbdb9a749c44258b83a553d9f
SHA1 ad0040580fd9635fed4414c38bf1df2734bb448e
SHA512 f859bd3a5680a97ef84e527f18457adfe8929af097ba1492221d8417dbba7126ae5d6d122b3afb4ad5cc89483fcc891dd25f16062c27a54e7866f183500c0790
SSDEEP 49152:OKpbWrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvP:OO
TLSH
T1D3C641AA76BA5ED6D08A0B3C0CB1D5174EACF634083A597251D140CF58EE2CAD73CBB5
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1340-0-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/1340-10-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/3000-5-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/3000-9-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/5792-6-0x00000000004C0000-0x0000000000507000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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