tofsee | 2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b

General

Target
2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe
Size 10.7MB
Sample261109-292mcswwbx
SHA256 2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b
MD5 ecec7f4ea311e72829109eafbee23c7f
SHA1 4ecdcf7207eac93c7be15c01b210fb856606901f
SHA512 5abe8a7c409288ba996265ff527515b892212dceff7e2df5b86192e8312cd2a13b4fea8a9cca86fd52e4af35f62c93cdb94222ec2ebef577e4d2740fa6e8e252
SSDEEP 49152:flpsCDrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrj:f/
TLSH
T1BAB641AA76BA5ED6D08A0B3C0CB1D5174EACF634083A597251D140CF58EE2CAD73CBB5
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
2772	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
3412	sezwdccq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3412 set thread context of 5476	3412	sezwdccq.exe	101

Launches sc.exe 3 IoCs

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

pid	Process
4224	sc.exe
4536	sc.exe
4208	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
3400	cmd.exe
5412	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	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	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.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	sezwdccq.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3756 wrote to memory of 3400	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	89
PID 3756 wrote to memory of 5412	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	91
PID 3756 wrote to memory of 4224	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	93
PID 3756 wrote to memory of 4536	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	96
PID 3756 wrote to memory of 4208	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	98
PID 3412 wrote to memory of 5476	3412	sezwdccq.exe	101
PID 3412 wrote to memory of 5476	3412	sezwdccq.exe	101
PID 3756 wrote to memory of 2772	3756	2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe	102

C:\Users\Admin\AppData\Local\Temp\2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe
"C:\Users\Admin\AppData\Local\Temp\2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3756
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xwvpspft\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:3400
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sezwdccq.exe" C:\Windows\SysWOW64\xwvpspft\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5412
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xwvpspft binPath= "C:\Windows\SysWOW64\xwvpspft\sezwdccq.exe /d\"C:\Users\Admin\AppData\Local\Temp\2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4224
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xwvpspft "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4536
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xwvpspft
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4208
- 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:2772

C:\Windows\SysWOW64\xwvpspft\sezwdccq.exe
C:\Windows\SysWOW64\xwvpspft\sezwdccq.exe /d"C:\Users\Admin\AppData\Local\Temp\2257f4916a5f8f30de7456048cc46e7079c18f25c4b4aad03cacb966fa205a8b.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3412
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:5476

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 13.1MB
SHA256 cb7b6e083d5ea53cd4d7c2d3493b1d824336ddc98699707a080bb49519c7a944
MD5 4419ea09aa8b43124ae19ae0987cf1a9
SHA1 1a027ed9dc851bac2202af98d73939a6aa3d9bda
SHA512 622ea5ea721318d4467ee113c8d750fe75ce9fb6a1ff3a9b10ff3191993434929069d4d667ec9549c4383d838279e217738786d7d812eb8da4d987fcab6080e9
SSDEEP 49152:ZlpsCDrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvr/:Z/
TLSH
T138D641AA76BA5ED6D08A0B3C0CB1D5174EACF634083A597251D140CF58EE2CAD73CBB5
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/3412-5-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/3412-9-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/3756-0-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/3756-10-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/5476-6-0x0000000001280000-0x00000000012C7000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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