tofsee | 9771659122d068ceb3bcb1965b659b1d16c9f3afd290e058d5feddb667a475ae

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-09-2024 21:13

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General

Target

9b90e99043652fd044759bd26e1a6ef0N.exe
Size

71KB
MD5

9b90e99043652fd044759bd26e1a6ef0
SHA1

0b2b1752d9b3efb0778cb5f432b8df0f2d24fec9
SHA256

9771659122d068ceb3bcb1965b659b1d16c9f3afd290e058d5feddb667a475ae
SHA512

d2f7ecc6ebf815ec92a7541d615c51f8127ee62671065e27ac62dd96859ce8e08ebd9f397eb993e3565623253b9e16f09e47be6c07a9b02b40f8594cee554e44
SSDEEP

1536:6kss21VCb7jTxSYgOuzTjFWL9bSpIrUc:61VCbrxSYFuzFFpIo

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\pqlfbksn = "0"	svchost.exe

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

Processes:

netsh.exe

pid	Process
2792	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\pqlfbksn\ImagePath = "C:\\Windows\\SysWOW64\\pqlfbksn\\yavbuhr.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid	Process
2864	svchost.exe

Executes dropped EXE 1 IoCs

Processes:

yavbuhr.exe

pid	Process
2832	yavbuhr.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

yavbuhr.exe

description	pid	Process	procid_target
PID 2832 set thread context of 2864	2832	yavbuhr.exe	42

Launches sc.exe 3 IoCs

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

Processes:

sc.exesc.exesc.exe

pid	Process
1784	sc.exe
2688	sc.exe
2804	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

Processes:

netsh.exe

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

Processes:

sc.exeyavbuhr.exenetsh.exe9b90e99043652fd044759bd26e1a6ef0N.exesc.exesc.execmd.execmd.exesvchost.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yavbuhr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	9b90e99043652fd044759bd26e1a6ef0N.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

9b90e99043652fd044759bd26e1a6ef0N.exeyavbuhr.exe

description	pid	Process	procid_target
PID 1792 wrote to memory of 2972	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	30
PID 1792 wrote to memory of 2972	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	30
PID 1792 wrote to memory of 2972	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	30
PID 1792 wrote to memory of 2972	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	30
PID 1792 wrote to memory of 2988	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	32
PID 1792 wrote to memory of 2988	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	32
PID 1792 wrote to memory of 2988	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	32
PID 1792 wrote to memory of 2988	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	32
PID 1792 wrote to memory of 1784	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	34
PID 1792 wrote to memory of 1784	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	34
PID 1792 wrote to memory of 1784	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	34
PID 1792 wrote to memory of 1784	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	34
PID 1792 wrote to memory of 2688	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	37
PID 1792 wrote to memory of 2688	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	37
PID 1792 wrote to memory of 2688	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	37
PID 1792 wrote to memory of 2688	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	37
PID 1792 wrote to memory of 2804	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	39
PID 1792 wrote to memory of 2804	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	39
PID 1792 wrote to memory of 2804	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	39
PID 1792 wrote to memory of 2804	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	39
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 2832 wrote to memory of 2864	2832	yavbuhr.exe	42
PID 1792 wrote to memory of 2792	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	43
PID 1792 wrote to memory of 2792	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	43
PID 1792 wrote to memory of 2792	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	43
PID 1792 wrote to memory of 2792	1792	9b90e99043652fd044759bd26e1a6ef0N.exe	43

C:\Users\Admin\AppData\Local\Temp\9b90e99043652fd044759bd26e1a6ef0N.exe
"C:\Users\Admin\AppData\Local\Temp\9b90e99043652fd044759bd26e1a6ef0N.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1792
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pqlfbksn\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2972
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yavbuhr.exe" C:\Windows\SysWOW64\pqlfbksn\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2988
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create pqlfbksn binPath= "C:\Windows\SysWOW64\pqlfbksn\yavbuhr.exe /d\"C:\Users\Admin\AppData\Local\Temp\9b90e99043652fd044759bd26e1a6ef0N.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1784
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description pqlfbksn "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start pqlfbksn
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2804
- 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:2792

C:\Windows\SysWOW64\pqlfbksn\yavbuhr.exe
C:\Windows\SysWOW64\pqlfbksn\yavbuhr.exe /d"C:\Users\Admin\AppData\Local\Temp\9b90e99043652fd044759bd26e1a6ef0N.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2832
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
11.1MB

MD5
482982b36a4aa86476ce10dea042a968

SHA1
b163e1dbce120ce82dde609e540e3090bb2b49cd

SHA256
2f9308b678b6b2693475317ffd45e378af442bc0849de3c207ea440cd749a065

SHA512
0514dfee6023ef3739eb0e3a2d534a576399b117f1cef9a991de8e55d27ff42dad1c47de5e4c8579f9354cc3056b2ad2cbf1119e2e5dfa001ce040125d8b99f8

Download Submit
memory/2864-6-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2864-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2864-3-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2864-8-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2864-9-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download