tofsee | 5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b

General

Target
5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe
Size 11.8MB
Sample261112-h396daey4t
SHA256 5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b
MD5 de21504c0d72a0c845644b9c95a66f1b
SHA1 15447191ddb4452e3d7fe74f78079d5fa635fe88
SHA512 6b5dec9542d6efe5d1dd0c6b46630fcb5878613b9d79e533f3a5a483585c76df67253546e2a6364f596a93c530b70654a0d6e2a3b23b4a4fda4e439ab5510222
SSDEEP 49152:clp+5rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv3:cW
TLSH
T18CC6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
4360	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
3092	runvtvdn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3092 set thread context of 3032	3092	runvtvdn.exe	101

Launches sc.exe 3 IoCs

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

pid	Process
2524	sc.exe
792	sc.exe
6040	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
4088	cmd.exe
5184	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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	runvtvdn.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.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

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5732 wrote to memory of 4088	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	89
PID 5732 wrote to memory of 5184	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	91
PID 5732 wrote to memory of 792	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	93
PID 5732 wrote to memory of 6040	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	95
PID 5732 wrote to memory of 2524	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	97
PID 3092 wrote to memory of 3032	3092	runvtvdn.exe	101
PID 3092 wrote to memory of 3032	3092	runvtvdn.exe	101
PID 5732 wrote to memory of 4360	5732	5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe	102

C:\Users\Admin\AppData\Local\Temp\5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe
"C:\Users\Admin\AppData\Local\Temp\5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5732
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yatqyanq\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4088
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\runvtvdn.exe" C:\Windows\SysWOW64\yatqyanq\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5184
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yatqyanq binPath= "C:\Windows\SysWOW64\yatqyanq\runvtvdn.exe /d\"C:\Users\Admin\AppData\Local\Temp\5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:792
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yatqyanq "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:6040
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yatqyanq
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2524
- 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:4360

C:\Windows\SysWOW64\yatqyanq\runvtvdn.exe
C:\Windows\SysWOW64\yatqyanq\runvtvdn.exe /d"C:\Users\Admin\AppData\Local\Temp\5e6b0a5ebd9512faed43938e4e92038a964c2658b6eb064137a59d9b3bf4b96b.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3092
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:3032

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

runvtvdn.exe

Path C:\Users\Admin\AppData\Local\Temp\runvtvdn.exe
Size 12.6MB
SHA256 31caf93e42ec915695cb71ac48591b769903a6cdd81013544f1989b9355cf30d
MD5 1f52eb00be067f045ab9bae74ff21bd1
SHA1 858a9d4d607bc861639544f79f0908aa20b27431
SHA512 9f4dd5cb75fbad3bda721dc47fcd85de6bd3942ebc50a69c09477ea2603dd5fbf76bbb809bc2a296860c2d3e5b8861d104022f25ad75e597db0dce455c0a54de
SSDEEP 49152:Rlp+5rvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvX:RW
TLSH
T1DBD6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3032-6-0x0000000000C00000-0x0000000000C49000-memory.dmp

Download

memory/3092-5-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/3092-7-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/5732-0-0x0000000000400000-0x0000000000449000-memory.dmp

Download

memory/5732-10-0x0000000000400000-0x0000000000449000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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