tofsee | c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb

General

Target
c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe
Size 14.9MB
Sample261109-h4dhssdd75
SHA256 c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb
MD5 c84b469820bc47bd6ec1ec9e0b630ff6
SHA1 344ea7cb2f2b7526e62694d2068a3bbd253ecb98
SHA512 e4611986dde62be10de72e6292a563c4d514bfc8e95786e7ca81c0c0504f7a0b3bba2a0e5bd43177f44d64f9d38747b6ef0fd3019e998f633298f5fd74cb38af
SSDEEP 49152:6Ep0Jrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv/:6l
TLSH
T17AF6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
3360	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
236	lsvtuuky.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 236 set thread context of 2216	236	lsvtuuky.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
108	sc.exe
4756	sc.exe
4296	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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\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
1892	cmd.exe
4020	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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	lsvtuuky.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4656 wrote to memory of 1892	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	90
PID 4656 wrote to memory of 4020	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	92
PID 4656 wrote to memory of 108	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	94
PID 4656 wrote to memory of 4756	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	97
PID 4656 wrote to memory of 4296	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	99
PID 236 wrote to memory of 2216	236	lsvtuuky.exe	102
PID 236 wrote to memory of 2216	236	lsvtuuky.exe	102
PID 4656 wrote to memory of 3360	4656	c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe	103

C:\Users\Admin\AppData\Local\Temp\c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe
"C:\Users\Admin\AppData\Local\Temp\c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4656
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qgsuovig\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:1892
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lsvtuuky.exe" C:\Windows\SysWOW64\qgsuovig\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4020
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create qgsuovig binPath= "C:\Windows\SysWOW64\qgsuovig\lsvtuuky.exe /d\"C:\Users\Admin\AppData\Local\Temp\c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:108
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description qgsuovig "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4756
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start qgsuovig
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4296
- 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:3360

C:\Windows\SysWOW64\qgsuovig\lsvtuuky.exe
C:\Windows\SysWOW64\qgsuovig\lsvtuuky.exe /d"C:\Users\Admin\AppData\Local\Temp\c4b05937e0c46b3514fa25fa39f645e15a5122b1073b31071c4887fad1e78fbb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:236
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:2216

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k GPSvcGroup
1⤵
PID:5964

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

lsvtuuky.exe

Path C:\Users\Admin\AppData\Local\Temp\lsvtuuky.exe
Size 10.7MB
SHA256 2aed67ed7093cb328dec224e07d9f056fa9a31ef276303066bbdad0065751666
MD5 69154df46855fa9e239a59cfc93a0397
SHA1 1eff854630dc6cf816d9418adfd610b6241211b4
SHA512 70b2dda4cd18ea7cccba57ecfd8b68e4cbdcf205dbd476d96f0953500e4d7de7d8aefb4cd36d9a60ea2b98e8ef1ed60045e8225ccc4e529c514b5d02a8160238
SSDEEP 49152:/Ep0JrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvD:/l
TLSH
T1E3B6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/236-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/236-8-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2216-6-0x0000000000740000-0x0000000000789000-memory.dmp

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memory/4656-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4656-10-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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