tofsee | 6e821f80b294536e0508db0fd37feb792c7adfffe6a057930abfd9630f55ac74

General

Target

307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe
Size

10.1MB
MD5

ff3556fcc81946e1a83ab271568bbd36
SHA1

2e74da5aec95c19c0521f80b0d019058c5fa2fad
SHA256

307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa
SHA512

c4c583736516d16ef249169af8668dde9e7e06cc534538c68e594bd68ca284784f5c766db8cb796669362bf1816e58d1790b38ffe757cf0a08ed4bb69d890eb6
SSDEEP

98304:qC+PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP/:p

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
5048	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\fbwtsyvt\ImagePath = "C:\\Windows\\SysWOW64\\fbwtsyvt\\rdyvcbbp.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe

Deletes itself 1 IoCs

pid	Process
2768	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3724	rdyvcbbp.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3724 set thread context of 2768	3724	rdyvcbbp.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
4528	sc.exe
720	sc.exe
116	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

System Location Discovery: System Language Discovery 1 TTPs 9 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	cmd.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	rdyvcbbp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1344 wrote to memory of 5020	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	85
PID 1344 wrote to memory of 5020	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	85
PID 1344 wrote to memory of 5020	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	85
PID 1344 wrote to memory of 1036	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	87
PID 1344 wrote to memory of 1036	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	87
PID 1344 wrote to memory of 1036	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	87
PID 1344 wrote to memory of 720	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	91
PID 1344 wrote to memory of 720	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	91
PID 1344 wrote to memory of 720	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	91
PID 1344 wrote to memory of 116	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	93
PID 1344 wrote to memory of 116	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	93
PID 1344 wrote to memory of 116	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	93
PID 1344 wrote to memory of 4528	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	97
PID 1344 wrote to memory of 4528	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	97
PID 1344 wrote to memory of 4528	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	97
PID 1344 wrote to memory of 5048	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	100
PID 1344 wrote to memory of 5048	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	100
PID 1344 wrote to memory of 5048	1344	307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe	100
PID 3724 wrote to memory of 2768	3724	rdyvcbbp.exe	102
PID 3724 wrote to memory of 2768	3724	rdyvcbbp.exe	102
PID 3724 wrote to memory of 2768	3724	rdyvcbbp.exe	102
PID 3724 wrote to memory of 2768	3724	rdyvcbbp.exe	102
PID 3724 wrote to memory of 2768	3724	rdyvcbbp.exe	102

C:\Users\Admin\AppData\Local\Temp\307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe
"C:\Users\Admin\AppData\Local\Temp\307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1344
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fbwtsyvt\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5020
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rdyvcbbp.exe" C:\Windows\SysWOW64\fbwtsyvt\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1036
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create fbwtsyvt binPath= "C:\Windows\SysWOW64\fbwtsyvt\rdyvcbbp.exe /d\"C:\Users\Admin\AppData\Local\Temp\307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:720
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description fbwtsyvt "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:116
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start fbwtsyvt
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4528
- 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:5048

C:\Windows\SysWOW64\fbwtsyvt\rdyvcbbp.exe
C:\Windows\SysWOW64\fbwtsyvt\rdyvcbbp.exe /d"C:\Users\Admin\AppData\Local\Temp\307644b1154391b4f425896da8efd9480fb3dda0f56c633b08c32058f5b469fa.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3724
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2768

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

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

C:\Users\Admin\AppData\Local\Temp\rdyvcbbp.exe

Filesize
13.7MB

MD5
85db91b293352ef33fb19337f06ab572

SHA1
b91d2794aa6501ad9ec4780faaffc72be227db82

SHA256
5e50e2f8b18c17b0b3e633221c7f00e76ef0f093a2bd91e8f06cab1f19793149

SHA512
d5fe090eb4951f667465cfb7c67ce1c9a6824c7cd2335a51d9af514a681716cd4f486428ea47e29a6c3cbed1caa9b413d6696509a773213b3b1d35a91f4dadc1

Download Submit
memory/1344-8-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/1344-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1344-2-0x00000000021F0000-0x0000000002203000-memory.dmp

Filesize
76KB

Download
memory/1344-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1344-9-0x00000000021F0000-0x0000000002203000-memory.dmp

Filesize
76KB

Download
memory/1344-1-0x0000000000500000-0x0000000000600000-memory.dmp

Filesize
1024KB

Download
memory/2768-14-0x0000000000B70000-0x0000000000B85000-memory.dmp

Filesize
84KB

Download
memory/2768-18-0x0000000000B70000-0x0000000000B85000-memory.dmp

Filesize
84KB

Download
memory/2768-19-0x0000000000B70000-0x0000000000B85000-memory.dmp

Filesize
84KB

Download
memory/3724-11-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3724-13-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3724-12-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download
memory/3724-16-0x0000000000400000-0x00000000004AD000-memory.dmp

Filesize
692KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads