tofsee | e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776

General

Target
e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe
Size 13.5MB
Sample261114-h37egset9s
SHA256 e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776
MD5 875e1bf3d06750b1d38f1e3414f1a194
SHA1 bc1cc16dccb364dd1e4931f897ce26894cd7dade
SHA512 617f370877ffb2e25c70c62e511994983b49d362024642cc11b3c8681899f6b91c5359eeb94e0b0dbf7d2b3fe0483181a036d6963102ed59502498463ed6ce47
SSDEEP 49152:4Ep0JrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvP:4l
TLSH
T1C5E6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
4672	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
204	biuhqdey.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 204 set thread context of 4448	204	biuhqdey.exe	101

Launches sc.exe 3 IoCs

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

pid	Process
5936	sc.exe
2740	sc.exe
2900	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
2428	cmd.exe
4136	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	biuhqdey.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 2428	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	89
PID 1652 wrote to memory of 4136	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	91
PID 1652 wrote to memory of 5936	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	93
PID 1652 wrote to memory of 2740	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	95
PID 1652 wrote to memory of 2900	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	97
PID 204 wrote to memory of 4448	204	biuhqdey.exe	101
PID 204 wrote to memory of 4448	204	biuhqdey.exe	101
PID 1652 wrote to memory of 4672	1652	e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe	102

C:\Users\Admin\AppData\Local\Temp\e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe
"C:\Users\Admin\AppData\Local\Temp\e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hrmqeowe\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:2428
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\biuhqdey.exe" C:\Windows\SysWOW64\hrmqeowe\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4136
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hrmqeowe binPath= "C:\Windows\SysWOW64\hrmqeowe\biuhqdey.exe /d\"C:\Users\Admin\AppData\Local\Temp\e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5936
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hrmqeowe "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2740
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hrmqeowe
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2900
- 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:4672

C:\Windows\SysWOW64\hrmqeowe\biuhqdey.exe
C:\Windows\SysWOW64\hrmqeowe\biuhqdey.exe /d"C:\Users\Admin\AppData\Local\Temp\e1a4b455e4491600fbe2f061b3cea6fbaf10cf16f4b1a898a12478a255fff776.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:204
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:4448

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

biuhqdey.exe

Path C:\Users\Admin\AppData\Local\Temp\biuhqdey.exe
Size 14.5MB
SHA256 f3b2eac377286fe807af6912e15c0b09e9f5cbd76fd29cdad511f1757417442c
MD5 3fc23d38ad54d60694c7641027d858d0
SHA1 7ae2f5150af24c9630bc6adc788cba005143390b
SHA512 84825b7c4f8613d832c4880aa39f5978ee9eb0518f269a33cc2b9fee9e8ff9b73e660bc39ce2d51daf1e4332153173e35ff3c1cc10d64edd783e7529261b9c66
SSDEEP 49152:IEp0Jrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv3:Il
TLSH
T10AE6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/204-5-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/204-9-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/1652-0-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/1652-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4448-6-0x0000000001250000-0x0000000001299000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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