tofsee | 22525c8a7671fc0c1bd018d0e03157152be106f503179a31281aebfa79d693a7

Analysis

max time kernel
145s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
30/01/2025, 05:51

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General

Target

27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe
Size

10.4MB
MD5

294edd017790046d81c0b3b38ea28f3e
SHA1

ab3d536beb0e7b529a3dc544aaf4af85f2344675
SHA256

27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704
SHA512

053d54668bcf7ebac796085d1be12d27ea784dd8e1b60bc3f626c81ce890809253b7ad4107448a500bba3a00e1cf38d38cbba014efb226854db2ff78917d5d74
SSDEEP

49152:dYq2SzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAzAz:dYR

Score

10^/10

tofsee defense_evasion discovery 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
Tofsee family
tofsee

Windows security bypass 2 TTPs 1 IoCs

defense_evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\syywnyni = "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

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2552	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\syywnyni\ImagePath = "C:\\Windows\\SysWOW64\\syywnyni\\zlkyjtbv.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
640	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2536	zlkyjtbv.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2536 set thread context of 640	2536	zlkyjtbv.exe	44

Launches sc.exe 3 IoCs

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

pid	Process
2572	sc.exe
2848	sc.exe
2268	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 value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\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	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.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	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	zlkyjtbv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2700 wrote to memory of 2832	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	31
PID 2700 wrote to memory of 2832	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	31
PID 2700 wrote to memory of 2832	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	31
PID 2700 wrote to memory of 2832	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	31
PID 2700 wrote to memory of 2652	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	33
PID 2700 wrote to memory of 2652	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	33
PID 2700 wrote to memory of 2652	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	33
PID 2700 wrote to memory of 2652	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	33
PID 2700 wrote to memory of 2268	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	35
PID 2700 wrote to memory of 2268	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	35
PID 2700 wrote to memory of 2268	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	35
PID 2700 wrote to memory of 2268	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	35
PID 2700 wrote to memory of 2572	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	37
PID 2700 wrote to memory of 2572	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	37
PID 2700 wrote to memory of 2572	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	37
PID 2700 wrote to memory of 2572	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	37
PID 2700 wrote to memory of 2848	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	39
PID 2700 wrote to memory of 2848	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	39
PID 2700 wrote to memory of 2848	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	39
PID 2700 wrote to memory of 2848	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	39
PID 2700 wrote to memory of 2552	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	42
PID 2700 wrote to memory of 2552	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	42
PID 2700 wrote to memory of 2552	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	42
PID 2700 wrote to memory of 2552	2700	27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe	42
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44
PID 2536 wrote to memory of 640	2536	zlkyjtbv.exe	44

C:\Users\Admin\AppData\Local\Temp\27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe
"C:\Users\Admin\AppData\Local\Temp\27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\syywnyni\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2832
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zlkyjtbv.exe" C:\Windows\SysWOW64\syywnyni\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2652
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create syywnyni binPath= "C:\Windows\SysWOW64\syywnyni\zlkyjtbv.exe /d\"C:\Users\Admin\AppData\Local\Temp\27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2268
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description syywnyni "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2572
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start syywnyni
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2848
- 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:2552

C:\Windows\SysWOW64\syywnyni\zlkyjtbv.exe
C:\Windows\SysWOW64\syywnyni\zlkyjtbv.exe /d"C:\Users\Admin\AppData\Local\Temp\27ff12db2c2d5d3021e777fadc1e93be4ae4cd3ebc0fd0b45d6f98fcbcb3f704.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2536
- 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:640

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\zlkyjtbv.exe

Filesize
14.6MB

MD5
d5e8c8d3456df5f9f0c46e5380d94e4b

SHA1
c2d30127b21aebbb73951bc44eaa23dd9ab7163e

SHA256
01ed1750fcecb12a5c321e05754b4d6a6470c533e909bad5df5d5c1f10701c13

SHA512
ea53b1e5618791df8e8b00e622c54b6bc702aa6b65d8e836f25741677746510be796f450d651b90ad1ac0981f044b2b459cfd595ed360b6873935900b8b1219f

Download Submit
memory/640-12-0x0000000000090000-0x00000000000A5000-memory.dmp

Filesize
84KB

Download
memory/640-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/640-9-0x0000000000090000-0x00000000000A5000-memory.dmp

Filesize
84KB

Download
memory/640-15-0x0000000000090000-0x00000000000A5000-memory.dmp

Filesize
84KB

Download
memory/640-16-0x0000000000090000-0x00000000000A5000-memory.dmp

Filesize
84KB

Download
memory/2536-14-0x0000000000400000-0x00000000046EC000-memory.dmp

Filesize
66.9MB

Download
memory/2700-2-0x0000000000400000-0x00000000046EC000-memory.dmp

Filesize
66.9MB

Download
memory/2700-3-0x0000000000400000-0x00000000046EC000-memory.dmp

Filesize
66.9MB

Download
memory/2700-7-0x0000000000400000-0x00000000046EC000-memory.dmp

Filesize
66.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads