tofsee | 72baaabc47b6560279dfb391dd1589221d02dcc247e8c3862d903b190b49de79

Analysis

max time kernel
148s
max time network
148s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
31-08-2024 05:47

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General

Target

52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe
Size

14.6MB
MD5

6e734800376974cd4fbe0fbc91e0a138
SHA1

7711d0bc3c0e82526029b67473cc5ee222933497
SHA256

52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e
SHA512

911b78fc44b16cd3e3337a320513081dd65f0dd671b1847c35187e3b7ea9603f0f16d869fb355cecffc6f22d02b4b1212a9fa3151bdc361b790cd648cd374c86
SSDEEP

98304:8wfDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDr:8w

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

defeatwax.ru

refabyd.info

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

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\rzurfmwi = "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
2972	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\rzurfmwi\ImagePath = "C:\\Windows\\SysWOW64\\rzurfmwi\\brmyseia.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2716	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2976	brmyseia.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2976 set thread context of 2716	2976	brmyseia.exe	44

Launches sc.exe 3 IoCs

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

pid	Process
2368	sc.exe
2752	sc.exe
2708	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	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	brmyseia.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2628 wrote to memory of 2296	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	31
PID 2628 wrote to memory of 2296	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	31
PID 2628 wrote to memory of 2296	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	31
PID 2628 wrote to memory of 2296	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	31
PID 2628 wrote to memory of 1112	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	33
PID 2628 wrote to memory of 1112	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	33
PID 2628 wrote to memory of 1112	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	33
PID 2628 wrote to memory of 1112	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	33
PID 2628 wrote to memory of 2368	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	35
PID 2628 wrote to memory of 2368	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	35
PID 2628 wrote to memory of 2368	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	35
PID 2628 wrote to memory of 2368	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	35
PID 2628 wrote to memory of 2752	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	37
PID 2628 wrote to memory of 2752	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	37
PID 2628 wrote to memory of 2752	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	37
PID 2628 wrote to memory of 2752	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	37
PID 2628 wrote to memory of 2708	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	39
PID 2628 wrote to memory of 2708	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	39
PID 2628 wrote to memory of 2708	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	39
PID 2628 wrote to memory of 2708	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	39
PID 2628 wrote to memory of 2972	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	42
PID 2628 wrote to memory of 2972	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	42
PID 2628 wrote to memory of 2972	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	42
PID 2628 wrote to memory of 2972	2628	52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe	42
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44
PID 2976 wrote to memory of 2716	2976	brmyseia.exe	44

C:\Users\Admin\AppData\Local\Temp\52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe
"C:\Users\Admin\AppData\Local\Temp\52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2628
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rzurfmwi\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:2296
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brmyseia.exe" C:\Windows\SysWOW64\rzurfmwi\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1112
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rzurfmwi binPath= "C:\Windows\SysWOW64\rzurfmwi\brmyseia.exe /d\"C:\Users\Admin\AppData\Local\Temp\52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2368
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rzurfmwi "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2752
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rzurfmwi
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2708
- 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:2972

C:\Windows\SysWOW64\rzurfmwi\brmyseia.exe
C:\Windows\SysWOW64\rzurfmwi\brmyseia.exe /d"C:\Users\Admin\AppData\Local\Temp\52d959c6afd889d69fe66d351a34769888c62ce16a140cac88b1303bd772dc5e.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2976
- 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:2716

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\brmyseia.exe

Filesize
12.6MB

MD5
b3dd269de4b8c04ba7f19f0cbf9adf30

SHA1
95b38938907312187e9f721c7d62a63f02acb035

SHA256
de0438e8d014adf0e1618ad2821357fd9ea4638b13116305367fa72a398c7fac

SHA512
ab7e531e6c6eadb4728faf8396d4fd128dd6f296e11a444c2083a304731d2b3b91b1a7db56b3b0d8b79e99bd23aac57381a7ee311d5de1942c13f1013be83458

Download Submit
memory/2628-8-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/2628-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2628-2-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/2628-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2628-9-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/2628-1-0x00000000002D0000-0x00000000003D0000-memory.dmp

Filesize
1024KB

Download
memory/2716-11-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2716-14-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2716-16-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2716-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2716-18-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/2976-17-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads