tofsee | c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51

General

Target
c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe
Size 13.3MB
Sample261104-nes5vadb74
SHA256 c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51
MD5 caff4cb1d853830994014b2f42484c52
SHA1 8827edce75ad9e524031a4669770e5b25ea37166
SHA512 2012a8d0663a10162d1d8d36c2c809008cce2207aa1a755ef3ed5b9cd10718d7b71f09d22ffd125a688ea335393ac4502f74c9541dc44092d43d8b05558531ad
SSDEEP 49152:Ezp2frvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvb:Ek
TLSH
T1EDE6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
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
4828	netsh.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-1-5-21-895009113-1202185046-1686627690-1000\Control Panel\International\Geo\Nation	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Executes dropped EXE 1 IoCs

pid	Process
4252	pbwtazzn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4252 set thread context of 1864	4252	pbwtazzn.exe	97

Launches sc.exe 3 IoCs

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

pid	Process
5088	sc.exe
3296	sc.exe
4572	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
3376	cmd.exe
4228	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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.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	pbwtazzn.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2120 wrote to memory of 3376	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	84
PID 2120 wrote to memory of 4228	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	86
PID 2120 wrote to memory of 5088	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	88
PID 2120 wrote to memory of 3296	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	90
PID 2120 wrote to memory of 4572	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	94
PID 4252 wrote to memory of 1864	4252	pbwtazzn.exe	97
PID 4252 wrote to memory of 1864	4252	pbwtazzn.exe	97
PID 2120 wrote to memory of 4828	2120	c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe	99

C:\Users\Admin\AppData\Local\Temp\c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe
"C:\Users\Admin\AppData\Local\Temp\c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2120
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\opkfgobf\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:3376
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pbwtazzn.exe" C:\Windows\SysWOW64\opkfgobf\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:4228
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create opkfgobf binPath= "C:\Windows\SysWOW64\opkfgobf\pbwtazzn.exe /d\"C:\Users\Admin\AppData\Local\Temp\c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:5088
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description opkfgobf "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3296
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start opkfgobf
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4572
- 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:4828

C:\Windows\SysWOW64\opkfgobf\pbwtazzn.exe
C:\Windows\SysWOW64\opkfgobf\pbwtazzn.exe /d"C:\Users\Admin\AppData\Local\Temp\c37556c43f554973600e08a3bbc2a41d67b814938cdc9c4aee819afe2aad9f51.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4252
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:1864

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

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

pbwtazzn.exe

Path C:\Users\Admin\AppData\Local\Temp\pbwtazzn.exe
Size 14.9MB
SHA256 5fc15b0c2592c86a60e0f705704d05a2739429efbdb29b28e09c9900a14fc6c6
MD5 51d3e1c51589a6067dff350e5d692d20
SHA1 724fdb1beb278c845b0928e73076000a276ab46a
SHA512 2fc6961ac25337d74b81b2866238c6bf9909381d872e32fb87aba736587545a111d4eb924dc6e52c3be42c2f422eb016a70949d4e1a15c3d16ea3bddce9b57d3
SSDEEP 49152:zzp2frvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvv:zk
TLSH
T113F6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1864-6-0x00000000012E0000-0x0000000001329000-memory.dmp

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memory/2120-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2120-10-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4252-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4252-9-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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