tofsee | d5765dff5690f5f9a337c9fa0047b8c58e9f2ec2b6211f8482d57c5bf251308c

General

Target

23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe
Size

11.3MB
MD5

d318dc7b92c68cddb6ac8e82af8a7439
SHA1

c6fd11ca5e592b4992663d210b0c622e47c6697c
SHA256

23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716
SHA512

e44a44fe52d6017ef83aa569ca6c0277e0c8dd09f255e3b68fbbc032703ce8deee7f40c887abfe3feac291e63baa62e04098ad43ab15e2df3476cc731995c945
SSDEEP

98304:9EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEU:

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
1828	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\cezylhfx\ImagePath = "C:\\Windows\\SysWOW64\\cezylhfx\\tjeqkwas.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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe

Deletes itself 1 IoCs

pid	Process
4364	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1524	tjeqkwas.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1524 set thread context of 4364	1524	tjeqkwas.exe	106

Launches sc.exe 3 IoCs

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

pid	Process
2196	sc.exe
636	sc.exe
3276	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 2 IoCs

pid	pid_target	Process	procid_target
2760	4380	WerFault.exe	83
4236	1524	WerFault.exe	100

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	svchost.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	tjeqkwas.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.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

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4380 wrote to memory of 5016	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	86
PID 4380 wrote to memory of 5016	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	86
PID 4380 wrote to memory of 5016	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	86
PID 4380 wrote to memory of 4196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	90
PID 4380 wrote to memory of 4196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	90
PID 4380 wrote to memory of 4196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	90
PID 4380 wrote to memory of 2196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	92
PID 4380 wrote to memory of 2196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	92
PID 4380 wrote to memory of 2196	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	92
PID 4380 wrote to memory of 636	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	96
PID 4380 wrote to memory of 636	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	96
PID 4380 wrote to memory of 636	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	96
PID 4380 wrote to memory of 3276	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	98
PID 4380 wrote to memory of 3276	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	98
PID 4380 wrote to memory of 3276	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	98
PID 4380 wrote to memory of 1828	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	101
PID 4380 wrote to memory of 1828	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	101
PID 4380 wrote to memory of 1828	4380	23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe	101
PID 1524 wrote to memory of 4364	1524	tjeqkwas.exe	106
PID 1524 wrote to memory of 4364	1524	tjeqkwas.exe	106
PID 1524 wrote to memory of 4364	1524	tjeqkwas.exe	106
PID 1524 wrote to memory of 4364	1524	tjeqkwas.exe	106
PID 1524 wrote to memory of 4364	1524	tjeqkwas.exe	106

C:\Users\Admin\AppData\Local\Temp\23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe
"C:\Users\Admin\AppData\Local\Temp\23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4380
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cezylhfx\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:5016
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tjeqkwas.exe" C:\Windows\SysWOW64\cezylhfx\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4196
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create cezylhfx binPath= "C:\Windows\SysWOW64\cezylhfx\tjeqkwas.exe /d\"C:\Users\Admin\AppData\Local\Temp\23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2196
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description cezylhfx "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:636
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start cezylhfx
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:3276
- 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:1828
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4380 -s 676
  2⤵
  - Program crash
  PID:2760

C:\Windows\SysWOW64\cezylhfx\tjeqkwas.exe
C:\Windows\SysWOW64\cezylhfx\tjeqkwas.exe /d"C:\Users\Admin\AppData\Local\Temp\23f1145599ca4f2836be5ba2ef445c06709df2e71dc30d6cd534b60810673716.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1524
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4364
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1524 -s 512
  2⤵
  - Program crash
  PID:4236

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4380 -ip 4380
1⤵
PID:4988

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1524 -ip 1524
1⤵
PID:4980

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\tjeqkwas.exe

Filesize
10.8MB

MD5
895fb2748ebd30da87c3044eaf5f9400

SHA1
0af7a97016c05528a4ec6d6b21c62c8581367fe7

SHA256
d9c8a602dd41073d1baf29d0533423c355bbabdf217b73109ddd423caf702a97

SHA512
c50997a05543e07ba73bed7dc440b2a21ab66c4013fd439b1c25160e7fa0b085d796d2c1e02653092b304670ecec56c266b1bd58a73b3de9ac64525b79fbc239

Download Submit
memory/1524-13-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/1524-11-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/1524-12-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/1524-19-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/4364-14-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4364-16-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4364-17-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4380-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4380-2-0x00000000001C0000-0x00000000001D3000-memory.dmp

Filesize
76KB

Download
memory/4380-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/4380-9-0x00000000001C0000-0x00000000001D3000-memory.dmp

Filesize
76KB

Download
memory/4380-8-0x0000000000400000-0x0000000000448000-memory.dmp

Filesize
288KB

Download
memory/4380-1-0x0000000000780000-0x0000000000880000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads