tofsee | e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb

General

Target
e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe
Size 12.2MB
Sample261108-nep37act7p
SHA256 e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb
MD5 d504c78c043e4c50535c47d7caa3885a
SHA1 5eb1da648b213a9701de44c9903ed5474959b328
SHA512 f6b94e8dd901575e1eac247ff5f9d16c0c85d63eaedb434bd49d8e7823825e74494ee1122a4b295e8005fef92b33844148bd0fa218165cfdb46946e5e7014c6d
SSDEEP 49152:HeppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvr/:HKA
TLSH
T129D6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
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
5452	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
4636	wzsayais.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4636 set thread context of 1920	4636	wzsayais.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
2052	sc.exe
1904	sc.exe
1572	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
3352	cmd.exe
5604	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	wzsayais.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4364 wrote to memory of 5604	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	90
PID 4364 wrote to memory of 3352	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	92
PID 4364 wrote to memory of 2052	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	94
PID 4364 wrote to memory of 1904	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	96
PID 4364 wrote to memory of 1572	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	99
PID 4636 wrote to memory of 1920	4636	wzsayais.exe	102
PID 4636 wrote to memory of 1920	4636	wzsayais.exe	102
PID 4364 wrote to memory of 5452	4364	e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe	103

C:\Users\Admin\AppData\Local\Temp\e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe
"C:\Users\Admin\AppData\Local\Temp\e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4364
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\grsapbzz\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5604
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wzsayais.exe" C:\Windows\SysWOW64\grsapbzz\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:3352
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create grsapbzz binPath= "C:\Windows\SysWOW64\grsapbzz\wzsayais.exe /d\"C:\Users\Admin\AppData\Local\Temp\e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2052
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description grsapbzz "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1904
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start grsapbzz
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1572
- 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:5452

C:\Windows\SysWOW64\grsapbzz\wzsayais.exe
C:\Windows\SysWOW64\grsapbzz\wzsayais.exe /d"C:\Users\Admin\AppData\Local\Temp\e1bc59a6019b369832ae223654ddc176f43700da7cc16f38726b5686cabbbadb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4636
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:1920

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

wzsayais.exe

Path C:\Users\Admin\AppData\Local\Temp\wzsayais.exe
Size 13.4MB
SHA256 ae2cda1a0b3bd2d401e031bc00d8668ffb0e3d45ab678e1457c54f5b6ac5c136
MD5 b76d7d2e49520c19401d13a63b87bf58
SHA1 cbdef4c0cf236b3463fe2024fc6fe69226c734c1
SHA512 6c8c0b0ff8599c5c6182ce2a8658abfe67b5f70be18010ad179180eaf0b543486175c2250e2fb96670b5486ed07e5b091ecd2685c90245a6e5745edea5954ea0
SSDEEP 49152:7eppA1rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvr3:7KA
TLSH
T1FBE6436676D86ED9D0CA0FBC09A1C42B5DECF734043A953096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1920-6-0x0000000000510000-0x0000000000559000-memory.dmp

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memory/1920-10-0x0000000000510000-0x0000000000559000-memory.dmp

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memory/1920-12-0x0000000000510000-0x0000000000559000-memory.dmp

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memory/4364-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4364-11-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4636-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4636-9-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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