tofsee | 3267c7ed315c80d9adacd52955f0ed95c87ff53254fa2a4c488b954f18d69146

General

Target

b6aa339961e8256355772ee4a76272a8.exe
Size

14.4MB
MD5

b6aa339961e8256355772ee4a76272a8
SHA1

a5117a6592043a309702243c61cace3775cc34ea
SHA256

3267c7ed315c80d9adacd52955f0ed95c87ff53254fa2a4c488b954f18d69146
SHA512

e72c0e909fdf2479fc0d5f238dc6188e819f28006763a93601e7be46cc478fe5e96ac64731bb788ed0c6c3860e697bd36e6af26da690ed0842ba8ada519dfa28
SSDEEP

24576:Ngdy5yNM4444444444444444444444444444444444444444444444444444444D:

Score

10^/10

tofsee evasion persistence 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) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3324	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\bdmncjwx\ImagePath = "C:\\Windows\\SysWOW64\\bdmncjwx\\sktbylxr.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-1-5-21-566096764-1992588923-1249862864-1000\Control Panel\International\Geo\Nation	b6aa339961e8256355772ee4a76272a8.exe

Deletes itself 1 IoCs

pid	Process
1664	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4032	sktbylxr.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4032 set thread context of 1664	4032	sktbylxr.exe	113

Launches sc.exe 3 IoCs

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

pid	Process
760	sc.exe
1448	sc.exe
648	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
2300	608	WerFault.exe	88
3272	4032	WerFault.exe	106

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 608 wrote to memory of 4700	608	b6aa339961e8256355772ee4a76272a8.exe	92
PID 608 wrote to memory of 4700	608	b6aa339961e8256355772ee4a76272a8.exe	92
PID 608 wrote to memory of 4700	608	b6aa339961e8256355772ee4a76272a8.exe	92
PID 608 wrote to memory of 2680	608	b6aa339961e8256355772ee4a76272a8.exe	94
PID 608 wrote to memory of 2680	608	b6aa339961e8256355772ee4a76272a8.exe	94
PID 608 wrote to memory of 2680	608	b6aa339961e8256355772ee4a76272a8.exe	94
PID 608 wrote to memory of 760	608	b6aa339961e8256355772ee4a76272a8.exe	96
PID 608 wrote to memory of 760	608	b6aa339961e8256355772ee4a76272a8.exe	96
PID 608 wrote to memory of 760	608	b6aa339961e8256355772ee4a76272a8.exe	96
PID 608 wrote to memory of 1448	608	b6aa339961e8256355772ee4a76272a8.exe	100
PID 608 wrote to memory of 1448	608	b6aa339961e8256355772ee4a76272a8.exe	100
PID 608 wrote to memory of 1448	608	b6aa339961e8256355772ee4a76272a8.exe	100
PID 608 wrote to memory of 648	608	b6aa339961e8256355772ee4a76272a8.exe	103
PID 608 wrote to memory of 648	608	b6aa339961e8256355772ee4a76272a8.exe	103
PID 608 wrote to memory of 648	608	b6aa339961e8256355772ee4a76272a8.exe	103
PID 608 wrote to memory of 3324	608	b6aa339961e8256355772ee4a76272a8.exe	109
PID 608 wrote to memory of 3324	608	b6aa339961e8256355772ee4a76272a8.exe	109
PID 608 wrote to memory of 3324	608	b6aa339961e8256355772ee4a76272a8.exe	109
PID 4032 wrote to memory of 1664	4032	sktbylxr.exe	113
PID 4032 wrote to memory of 1664	4032	sktbylxr.exe	113
PID 4032 wrote to memory of 1664	4032	sktbylxr.exe	113
PID 4032 wrote to memory of 1664	4032	sktbylxr.exe	113
PID 4032 wrote to memory of 1664	4032	sktbylxr.exe	113

C:\Users\Admin\AppData\Local\Temp\b6aa339961e8256355772ee4a76272a8.exe
"C:\Users\Admin\AppData\Local\Temp\b6aa339961e8256355772ee4a76272a8.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:608
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bdmncjwx\
  2⤵
  PID:4700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sktbylxr.exe" C:\Windows\SysWOW64\bdmncjwx\
  2⤵
  PID:2680
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bdmncjwx binPath= "C:\Windows\SysWOW64\bdmncjwx\sktbylxr.exe /d\"C:\Users\Admin\AppData\Local\Temp\b6aa339961e8256355772ee4a76272a8.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:760
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bdmncjwx "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1448
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bdmncjwx
  2⤵
  - Launches sc.exe
  PID:648
- 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
  PID:3324
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 608 -s 1232
  2⤵
  - Program crash
  PID:2300

C:\Windows\SysWOW64\bdmncjwx\sktbylxr.exe
C:\Windows\SysWOW64\bdmncjwx\sktbylxr.exe /d"C:\Users\Admin\AppData\Local\Temp\b6aa339961e8256355772ee4a76272a8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4032
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:1664
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4032 -s 512
  2⤵
  - Program crash
  PID:3272

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 608 -ip 608
1⤵
PID:1012

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 4032 -ip 4032
1⤵
PID:1724

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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

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

Replay Monitor

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Downloads

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

Filesize
10.0MB

MD5
e3051c608724d78209aebb4b0abb06d6

SHA1
fb2f151c99304b956eda0dcc7c8965206607da7e

SHA256
43bc495bf156e9305c551caf10a8ffa644fb18fd568ec31fbc0a1225fe1a9f5f

SHA512
90b562e65a832214811fe189002a5548e174721022ce2d9f1d766d867252b0a747581fe03e68b171f1c456472f045ad86bedab2687e3b25816d0ef655c0e75ec

Download Submit
memory/608-1-0x0000000000600000-0x0000000000700000-memory.dmp

Filesize
1024KB

Download
memory/608-2-0x00000000005B0000-0x00000000005C3000-memory.dmp

Filesize
76KB

Download
memory/608-4-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/608-9-0x00000000005B0000-0x00000000005C3000-memory.dmp

Filesize
76KB

Download
memory/608-8-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/1664-15-0x0000000000620000-0x0000000000635000-memory.dmp

Filesize
84KB

Download
memory/1664-12-0x0000000000620000-0x0000000000635000-memory.dmp

Filesize
84KB

Download
memory/1664-16-0x0000000000620000-0x0000000000635000-memory.dmp

Filesize
84KB

Download
memory/1664-18-0x0000000000620000-0x0000000000635000-memory.dmp

Filesize
84KB

Download
memory/1664-19-0x0000000000620000-0x0000000000635000-memory.dmp

Filesize
84KB

Download
memory/4032-11-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download
memory/4032-10-0x00000000006E0000-0x00000000007E0000-memory.dmp

Filesize
1024KB

Download
memory/4032-17-0x0000000000400000-0x0000000000456000-memory.dmp

Filesize
344KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads