tofsee | 92afdac37111654925657288e25740c7291896b233c012e41ecd23e81b53dee4

Analysis

max time kernel
143s
max time network
146s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
10/02/2023, 10:48

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General

Target

file.exe
Size

357KB
MD5

88d3588e92f5c5f99a2e036252a9d281
SHA1

1ed1ce7b4cb75db17e90efd41349754113648fe0
SHA256

92afdac37111654925657288e25740c7291896b233c012e41ecd23e81b53dee4
SHA512

0b3e93cd59bb5fc8fe6fffe11c35e34fb0bb77bf1af10ce199c53715c09385b5f5b046b625bb6c1f4a0f7109030d5968fc128346de682d22827893e03d1c6131
SSDEEP

3072:0wHqb7eKdaMaTK8CyR6sb9SuqXZW8Va5tWGYkK/FBRA9nf6Nh382UUf/:pH6tauXsb96p/a5LVK/XR2nfWhsA/

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

svartalfheim.top

jotunheim.name

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

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\xjsvjrss = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1644	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\xjsvjrss\ImagePath = "C:\\Windows\\SysWOW64\\xjsvjrss\\dwtbslfc.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1588	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1816	dwtbslfc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1816 set thread context of 1588	1816	dwtbslfc.exe	39

Launches sc.exe 3 IoCs

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

pid	Process
956	sc.exe
1604	sc.exe
2012	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 856 wrote to memory of 1344	856	file.exe	26
PID 856 wrote to memory of 1344	856	file.exe	26
PID 856 wrote to memory of 1344	856	file.exe	26
PID 856 wrote to memory of 1344	856	file.exe	26
PID 856 wrote to memory of 1540	856	file.exe	28
PID 856 wrote to memory of 1540	856	file.exe	28
PID 856 wrote to memory of 1540	856	file.exe	28
PID 856 wrote to memory of 1540	856	file.exe	28
PID 856 wrote to memory of 956	856	file.exe	30
PID 856 wrote to memory of 956	856	file.exe	30
PID 856 wrote to memory of 956	856	file.exe	30
PID 856 wrote to memory of 956	856	file.exe	30
PID 856 wrote to memory of 1604	856	file.exe	32
PID 856 wrote to memory of 1604	856	file.exe	32
PID 856 wrote to memory of 1604	856	file.exe	32
PID 856 wrote to memory of 1604	856	file.exe	32
PID 856 wrote to memory of 2012	856	file.exe	34
PID 856 wrote to memory of 2012	856	file.exe	34
PID 856 wrote to memory of 2012	856	file.exe	34
PID 856 wrote to memory of 2012	856	file.exe	34
PID 856 wrote to memory of 1644	856	file.exe	37
PID 856 wrote to memory of 1644	856	file.exe	37
PID 856 wrote to memory of 1644	856	file.exe	37
PID 856 wrote to memory of 1644	856	file.exe	37
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39
PID 1816 wrote to memory of 1588	1816	dwtbslfc.exe	39

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:856
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xjsvjrss\
  2⤵
  PID:1344
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dwtbslfc.exe" C:\Windows\SysWOW64\xjsvjrss\
  2⤵
  PID:1540
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create xjsvjrss binPath= "C:\Windows\SysWOW64\xjsvjrss\dwtbslfc.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:956
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description xjsvjrss "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1604
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start xjsvjrss
  2⤵
  - Launches sc.exe
  PID:2012
- 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:1644

C:\Windows\SysWOW64\xjsvjrss\dwtbslfc.exe
C:\Windows\SysWOW64\xjsvjrss\dwtbslfc.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1816
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1588

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
10.8MB

MD5
baed2a7a9613fb92cd5037674b521b39

SHA1
ae0b9bd97b7b758494d2f99b07775652d6aabc30

SHA256
c074dd78979b3ae3adfd39cfc7fbbbd59885558b5c516a4067c77a941bf1181c

SHA512
e6d90580e414245f75fe49303d2bef4a158bd95db2ae34a709939898032867759fa14f864dcf8811e0d23be6edfaa2177940e112da25a8fcf45796184dc5dc5a

Download Submit
C:\Windows\SysWOW64\xjsvjrss\dwtbslfc.exe

Filesize
10.8MB

MD5
baed2a7a9613fb92cd5037674b521b39

SHA1
ae0b9bd97b7b758494d2f99b07775652d6aabc30

SHA256
c074dd78979b3ae3adfd39cfc7fbbbd59885558b5c516a4067c77a941bf1181c

SHA512
e6d90580e414245f75fe49303d2bef4a158bd95db2ae34a709939898032867759fa14f864dcf8811e0d23be6edfaa2177940e112da25a8fcf45796184dc5dc5a

Download Submit
memory/856-66-0x000000000066D000-0x0000000000683000-memory.dmp

Filesize
88KB

Download
memory/856-55-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/856-56-0x0000000076151000-0x0000000076153000-memory.dmp

Filesize
8KB

Download
memory/856-57-0x0000000000400000-0x0000000000485000-memory.dmp

Filesize
532KB

Download
memory/856-54-0x000000000066D000-0x0000000000683000-memory.dmp

Filesize
88KB

Download
memory/856-68-0x0000000000400000-0x0000000000485000-memory.dmp

Filesize
532KB

Download
memory/856-67-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1588-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1588-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1588-79-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1588-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1816-74-0x000000000058D000-0x00000000005A3000-memory.dmp

Filesize
88KB

Download
memory/1816-76-0x0000000000400000-0x0000000000485000-memory.dmp

Filesize
532KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads