tofsee | 26de0928d2adea856977192abe81d2777ea2a0814dfdecad619376ed669c3ae2

General

Target

c0885dffa6bd3706a5ee2830fa6334fa.exe
Size

12.6MB
MD5

c0885dffa6bd3706a5ee2830fa6334fa
SHA1

e140d9b206994b584e86b2656f5aa7612e372f75
SHA256

26de0928d2adea856977192abe81d2777ea2a0814dfdecad619376ed669c3ae2
SHA512

3e6c3fbd063288d4ce73fe81d1cf9cf48bd8744f408600e630cd2528ccb80cf3bf39574fcdd34f05fbf282dc41fada64f3bde0f4533b5c6c9bf55793a4d7f9f5
SSDEEP

6144:7+rWO2zeSPDjMXMH7Ll4aFpWVqIwUAP97GEwHrG2+e1x2:7+r1IeSXMXc7LlxWV4Ug97GZ+ej

Score

10^/10

tofsee evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
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
5092	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\ihdyyttb\ImagePath = "C:\\Windows\\SysWOW64\\ihdyyttb\\srhdkgl.exe"	svchost.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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	c0885dffa6bd3706a5ee2830fa6334fa.exe

Deletes itself 1 IoCs

pid	Process
4876	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1996	srhdkgl.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1996 set thread context of 4876	1996	srhdkgl.exe	96

Launches sc.exe 3 IoCs

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

pid	Process
4244	sc.exe
2068	sc.exe
4612	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

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1700 wrote to memory of 2896	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	83
PID 1700 wrote to memory of 2896	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	83
PID 1700 wrote to memory of 2896	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	83
PID 1700 wrote to memory of 1104	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	85
PID 1700 wrote to memory of 1104	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	85
PID 1700 wrote to memory of 1104	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	85
PID 1700 wrote to memory of 4244	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	87
PID 1700 wrote to memory of 4244	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	87
PID 1700 wrote to memory of 4244	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	87
PID 1700 wrote to memory of 2068	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	89
PID 1700 wrote to memory of 2068	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	89
PID 1700 wrote to memory of 2068	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	89
PID 1700 wrote to memory of 4612	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	91
PID 1700 wrote to memory of 4612	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	91
PID 1700 wrote to memory of 4612	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	91
PID 1700 wrote to memory of 5092	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	94
PID 1700 wrote to memory of 5092	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	94
PID 1700 wrote to memory of 5092	1700	c0885dffa6bd3706a5ee2830fa6334fa.exe	94
PID 1996 wrote to memory of 4876	1996	srhdkgl.exe	96
PID 1996 wrote to memory of 4876	1996	srhdkgl.exe	96
PID 1996 wrote to memory of 4876	1996	srhdkgl.exe	96
PID 1996 wrote to memory of 4876	1996	srhdkgl.exe	96
PID 1996 wrote to memory of 4876	1996	srhdkgl.exe	96

C:\Users\Admin\AppData\Local\Temp\c0885dffa6bd3706a5ee2830fa6334fa.exe
"C:\Users\Admin\AppData\Local\Temp\c0885dffa6bd3706a5ee2830fa6334fa.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ihdyyttb\
  2⤵
  PID:2896
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\srhdkgl.exe" C:\Windows\SysWOW64\ihdyyttb\
  2⤵
  PID:1104
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ihdyyttb binPath= "C:\Windows\SysWOW64\ihdyyttb\srhdkgl.exe /d\"C:\Users\Admin\AppData\Local\Temp\c0885dffa6bd3706a5ee2830fa6334fa.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4244
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ihdyyttb "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2068
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ihdyyttb
  2⤵
  - Launches sc.exe
  PID:4612
- 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
  PID:5092

C:\Windows\SysWOW64\ihdyyttb\srhdkgl.exe
C:\Windows\SysWOW64\ihdyyttb\srhdkgl.exe /d"C:\Users\Admin\AppData\Local\Temp\c0885dffa6bd3706a5ee2830fa6334fa.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1996
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

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

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
10.3MB

MD5
1db98a402157b472c886344ddf6e0a21

SHA1
ab07ed1f0464df94c2757b4b9c54dfd33fe7ee7d

SHA256
92d6e1b4165db1deb01836a96e099495ed1f0acfc7a26083bf16a532ebcdc845

SHA512
44432589c245145288d67af531f5ac6dc36d703cade711e60fc58f495274c45b836498e3de18a840e92529015f5c09996d84934bc14443d3efcb35543e377fe2

Download Submit
memory/1700-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

Filesize
1024KB

Download
memory/1700-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1700-7-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/1700-6-0x0000000000400000-0x000000000051A000-memory.dmp

Filesize
1.1MB

Download
memory/1996-9-0x0000000000400000-0x000000000051A000-memory.dmp

Filesize
1.1MB

Download
memory/1996-11-0x0000000000400000-0x000000000051A000-memory.dmp

Filesize
1.1MB

Download
memory/1996-14-0x0000000000400000-0x000000000051A000-memory.dmp

Filesize
1.1MB

Download
memory/4876-13-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

Filesize
84KB

Download
memory/4876-10-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

Filesize
84KB

Download
memory/4876-15-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads