tofsee | 036e57851b2b1068ce726544039a699f748ccbeba8bb2bbdf909cfc6fb95bb3e

General

Target

oavszyym.exe
Size

14.2MB
MD5

ffc03e5a236c9017d6866dadbdd1bdb0
SHA1

076cce6dd5ea98bb1bbc21280be47aa5aad0829f
SHA256

036e57851b2b1068ce726544039a699f748ccbeba8bb2bbdf909cfc6fb95bb3e
SHA512

5e2fa9d4ce5bc6e358eda911afa2dc3e54301ba9bf6aecc59161f707add76d19b9760be893a98e37ebd7e3b43987b4f9047ac5caea867783fdf3e7e0d89bd137
SSDEEP

24576:8W/EClxN7llllllllllllllllllllllllllllllllllllllllllllllllllllllb:84HN

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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
1756	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\zdszrosx\ImagePath = "C:\\Windows\\SysWOW64\\zdszrosx\\rdpxxixf.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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	oavszyym.exe

Deletes itself 1 IoCs

pid	Process
2716	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
5068	rdpxxixf.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5068 set thread context of 2716	5068	rdpxxixf.exe	106

Launches sc.exe 3 IoCs

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

pid	Process
3104	sc.exe
700	sc.exe
2564	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

Program crash 5 IoCs

pid	pid_target	Process	procid_target
3712	2276	WerFault.exe	83
3180	2276	WerFault.exe	83
2692	5068	WerFault.exe	99
3304	5068	WerFault.exe	99
3476	5068	WerFault.exe	99

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	oavszyym.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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rdpxxixf.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	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 4748	2276	oavszyym.exe	87
PID 2276 wrote to memory of 4748	2276	oavszyym.exe	87
PID 2276 wrote to memory of 4748	2276	oavszyym.exe	87
PID 2276 wrote to memory of 684	2276	oavszyym.exe	89
PID 2276 wrote to memory of 684	2276	oavszyym.exe	89
PID 2276 wrote to memory of 684	2276	oavszyym.exe	89
PID 2276 wrote to memory of 2564	2276	oavszyym.exe	91
PID 2276 wrote to memory of 2564	2276	oavszyym.exe	91
PID 2276 wrote to memory of 2564	2276	oavszyym.exe	91
PID 2276 wrote to memory of 3104	2276	oavszyym.exe	93
PID 2276 wrote to memory of 3104	2276	oavszyym.exe	93
PID 2276 wrote to memory of 3104	2276	oavszyym.exe	93
PID 2276 wrote to memory of 700	2276	oavszyym.exe	97
PID 2276 wrote to memory of 700	2276	oavszyym.exe	97
PID 2276 wrote to memory of 700	2276	oavszyym.exe	97
PID 2276 wrote to memory of 1756	2276	oavszyym.exe	100
PID 2276 wrote to memory of 1756	2276	oavszyym.exe	100
PID 2276 wrote to memory of 1756	2276	oavszyym.exe	100
PID 5068 wrote to memory of 2716	5068	rdpxxixf.exe	106
PID 5068 wrote to memory of 2716	5068	rdpxxixf.exe	106
PID 5068 wrote to memory of 2716	5068	rdpxxixf.exe	106
PID 5068 wrote to memory of 2716	5068	rdpxxixf.exe	106
PID 5068 wrote to memory of 2716	5068	rdpxxixf.exe	106

C:\Users\Admin\AppData\Local\Temp\oavszyym.exe
"C:\Users\Admin\AppData\Local\Temp\oavszyym.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2276
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zdszrosx\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4748
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rdpxxixf.exe" C:\Windows\SysWOW64\zdszrosx\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:684
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create zdszrosx binPath= "C:\Windows\SysWOW64\zdszrosx\rdpxxixf.exe /d\"C:\Users\Admin\AppData\Local\Temp\oavszyym.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2564
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description zdszrosx "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3104
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start zdszrosx
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:700
- 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:1756
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2276 -s 656
  2⤵
  - Program crash
  PID:3712
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2276 -s 1180
  2⤵
  - Program crash
  PID:3180

C:\Windows\SysWOW64\zdszrosx\rdpxxixf.exe
C:\Windows\SysWOW64\zdszrosx\rdpxxixf.exe /d"C:\Users\Admin\AppData\Local\Temp\oavszyym.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5068
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2716
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5068 -s 664
  2⤵
  - Program crash
  PID:2692
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5068 -s 716
  2⤵
  - Program crash
  PID:3304
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5068 -s 724
  2⤵
  - Program crash
  PID:3476

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2276 -ip 2276
1⤵
PID:1336

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 5068 -ip 5068
1⤵
PID:4048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 2276 -ip 2276
1⤵
PID:3860

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 5068 -ip 5068
1⤵
PID:1564

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 5068 -ip 5068
1⤵
PID:1128

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
13.0MB

MD5
39cfd89fd77a095530c64602c19aa4d1

SHA1
ab5e59d62c8f1777c50e9598c625b2efb2623adc

SHA256
1dbbdbc6cd74a756b8fb4051c9dda45240efe1754f7a757736326e461cc8e79e

SHA512
9f224765327754360803284b3c39d758ad66ecf84650effc7abac6aefc22944f4ec37a83e6dbc6ba4a6cc04aa4c5999489bd6d1ac06eb59eb91af7088baac88d

Download Submit
memory/2276-13-0x0000000000530000-0x0000000000543000-memory.dmp

Filesize
76KB

Download
memory/2276-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2276-2-0x0000000000530000-0x0000000000543000-memory.dmp

Filesize
76KB

Download
memory/2276-12-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/2276-14-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2276-1-0x0000000000550000-0x0000000000650000-memory.dmp

Filesize
1024KB

Download
memory/2716-10-0x0000000000340000-0x0000000000355000-memory.dmp

Filesize
84KB

Download
memory/2716-17-0x0000000000340000-0x0000000000355000-memory.dmp

Filesize
84KB

Download
memory/2716-18-0x0000000000340000-0x0000000000355000-memory.dmp

Filesize
84KB

Download
memory/5068-8-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5068-9-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download
memory/5068-16-0x0000000000400000-0x000000000044E000-memory.dmp

Filesize
312KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads