tofsee | cf1b38106e42989ddffb99e0163787135e7b294c5d5e88e3b47ca1b7cd0d6681

Analysis

max time kernel
147s
max time network
123s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-11-2024 08:10

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General

Target

0x000200000001acb5-183.exe
Size

10.2MB
MD5

6b32791ddadc54b2e770a881eb83c260
SHA1

d5815c8b204c47ebbb9f91c4f66e459e14136a32
SHA256

23cb1064049da1e64c231cacee9908d9c1aed6a57b786740361d206d14bd2973
SHA512

3a7334533bbcf4b1ad5b6200a9ef4c319a72ea06659e42c9b857e8e02c9115b04e63a61fb892f475456d53b907a7b7fe7fafb09d9e66cfc51481c2f170ac86fb
SSDEEP

3072:a4Ni29XsrLu6i5lJBq5pbNSwHSLlkEfr6c46GCMjjjjjjjjo:rj8rLu6qPqvb8wyLlnfGc46GCM

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
Tofsee family
tofsee

Windows security bypass 2 TTPs 1 IoCs

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\cvifxfva = "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

pid	Process
1800	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\cvifxfva\ImagePath = "C:\\Windows\\SysWOW64\\cvifxfva\\ulhofeim.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2576	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2948	ulhofeim.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2948 set thread context of 2576	2948	ulhofeim.exe	44

Launches sc.exe 3 IoCs

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

pid	Process
2264	sc.exe
2260	sc.exe
2796	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	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	ulhofeim.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0x000200000001acb5-183.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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 276 wrote to memory of 316	276	0x000200000001acb5-183.exe	31
PID 276 wrote to memory of 316	276	0x000200000001acb5-183.exe	31
PID 276 wrote to memory of 316	276	0x000200000001acb5-183.exe	31
PID 276 wrote to memory of 316	276	0x000200000001acb5-183.exe	31
PID 276 wrote to memory of 2080	276	0x000200000001acb5-183.exe	33
PID 276 wrote to memory of 2080	276	0x000200000001acb5-183.exe	33
PID 276 wrote to memory of 2080	276	0x000200000001acb5-183.exe	33
PID 276 wrote to memory of 2080	276	0x000200000001acb5-183.exe	33
PID 276 wrote to memory of 2264	276	0x000200000001acb5-183.exe	35
PID 276 wrote to memory of 2264	276	0x000200000001acb5-183.exe	35
PID 276 wrote to memory of 2264	276	0x000200000001acb5-183.exe	35
PID 276 wrote to memory of 2264	276	0x000200000001acb5-183.exe	35
PID 276 wrote to memory of 2260	276	0x000200000001acb5-183.exe	37
PID 276 wrote to memory of 2260	276	0x000200000001acb5-183.exe	37
PID 276 wrote to memory of 2260	276	0x000200000001acb5-183.exe	37
PID 276 wrote to memory of 2260	276	0x000200000001acb5-183.exe	37
PID 276 wrote to memory of 2796	276	0x000200000001acb5-183.exe	39
PID 276 wrote to memory of 2796	276	0x000200000001acb5-183.exe	39
PID 276 wrote to memory of 2796	276	0x000200000001acb5-183.exe	39
PID 276 wrote to memory of 2796	276	0x000200000001acb5-183.exe	39
PID 276 wrote to memory of 1800	276	0x000200000001acb5-183.exe	42
PID 276 wrote to memory of 1800	276	0x000200000001acb5-183.exe	42
PID 276 wrote to memory of 1800	276	0x000200000001acb5-183.exe	42
PID 276 wrote to memory of 1800	276	0x000200000001acb5-183.exe	42
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44
PID 2948 wrote to memory of 2576	2948	ulhofeim.exe	44

C:\Users\Admin\AppData\Local\Temp\0x000200000001acb5-183.exe
"C:\Users\Admin\AppData\Local\Temp\0x000200000001acb5-183.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:276
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cvifxfva\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:316
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ulhofeim.exe" C:\Windows\SysWOW64\cvifxfva\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2080
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create cvifxfva binPath= "C:\Windows\SysWOW64\cvifxfva\ulhofeim.exe /d\"C:\Users\Admin\AppData\Local\Temp\0x000200000001acb5-183.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2264
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description cvifxfva "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2260
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start cvifxfva
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2796
- 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:1800

C:\Windows\SysWOW64\cvifxfva\ulhofeim.exe
C:\Windows\SysWOW64\cvifxfva\ulhofeim.exe /d"C:\Users\Admin\AppData\Local\Temp\0x000200000001acb5-183.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2948
- 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:2576

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\ulhofeim.exe

Filesize
10.9MB

MD5
52403810ae9b630acf1b2b901df64e2b

SHA1
76c0aa03074d3820d14d963d61b115fbaa3ddece

SHA256
e55a359e8c15dbf5cc1d8346f038a31a8e58d98b364431f26b3c5dfc33b377a5

SHA512
3084454e5d8b43f7753be4b5e70885aa1563b647e73678cd7d30800df61bf24027e63fe8db3f0d4fa35cc6dd5e4d67b8c4a121bae450103de49471fd33a8eea7

Download Submit
memory/276-7-0x0000000000220000-0x000000000022D000-memory.dmp

Filesize
52KB

Download
memory/276-2-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/276-1-0x0000000000230000-0x0000000000243000-memory.dmp

Filesize
76KB

Download
memory/276-9-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/276-8-0x0000000000230000-0x0000000000243000-memory.dmp

Filesize
76KB

Download
memory/276-0-0x0000000000220000-0x000000000022D000-memory.dmp

Filesize
52KB

Download
memory/276-6-0x0000000000400000-0x00000000046CF000-memory.dmp

Filesize
66.8MB

Download
memory/2576-13-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2576-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2576-16-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2576-10-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2576-17-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2948-14-0x0000000000400000-0x00000000046CF000-memory.dmp

Filesize
66.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads