tofsee | 13cd681d7e45bc2d09e19b295c64b4385fe309f71bb6032a7c9121c1e231ceaf

Analysis

max time kernel
146s
max time network
154s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
09/02/2023, 15:25

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General

Target
file.exe
Size 185KB
Sample230209-stl3ashf52
SHA256 13cd681d7e45bc2d09e19b295c64b4385fe309f71bb6032a7c9121c1e231ceaf
MD5 b7b237cd994f3dd0b83b901450728340
SHA1 1b439bbcca8b4aa3d69304a39e358f59a49b1859
SHA512 5ce367fd8385947514b50d31f99cedf8862bdc8fb3a4188a67fb91d4f6859b3f21a8896a8ae06782e8768aa299a9a7a98f87b641c2f1ecb32c68e5b00ebd280c
SSDEEP 3072:xfQRIdfbJ/wS7Oi93+h6dhSjqYSs9XQ1RAU:xfj9OSii9lPSGYSxRP
MD5 SHA1 SHA512 SSDEEP

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\fupzsobb = "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
1144	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\fupzsobb\ImagePath = "C:\\Windows\\SysWOW64\\fupzsobb\\nuuyzjte.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1824	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
848	nuuyzjte.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 848 set thread context of 1824	848	nuuyzjte.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2032	sc.exe
1344	sc.exe
868	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 1672 wrote to memory of 1940	1672	file.exe	28
PID 1672 wrote to memory of 1940	1672	file.exe	28
PID 1672 wrote to memory of 1940	1672	file.exe	28
PID 1672 wrote to memory of 1940	1672	file.exe	28
PID 1672 wrote to memory of 1740	1672	file.exe	30
PID 1672 wrote to memory of 1740	1672	file.exe	30
PID 1672 wrote to memory of 1740	1672	file.exe	30
PID 1672 wrote to memory of 1740	1672	file.exe	30
PID 1672 wrote to memory of 2032	1672	file.exe	32
PID 1672 wrote to memory of 2032	1672	file.exe	32
PID 1672 wrote to memory of 2032	1672	file.exe	32
PID 1672 wrote to memory of 2032	1672	file.exe	32
PID 1672 wrote to memory of 1344	1672	file.exe	34
PID 1672 wrote to memory of 1344	1672	file.exe	34
PID 1672 wrote to memory of 1344	1672	file.exe	34
PID 1672 wrote to memory of 1344	1672	file.exe	34
PID 1672 wrote to memory of 868	1672	file.exe	36
PID 1672 wrote to memory of 868	1672	file.exe	36
PID 1672 wrote to memory of 868	1672	file.exe	36
PID 1672 wrote to memory of 868	1672	file.exe	36
PID 1672 wrote to memory of 1144	1672	file.exe	39
PID 1672 wrote to memory of 1144	1672	file.exe	39
PID 1672 wrote to memory of 1144	1672	file.exe	39
PID 1672 wrote to memory of 1144	1672	file.exe	39
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41
PID 848 wrote to memory of 1824	848	nuuyzjte.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1672
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fupzsobb\
  2⤵
  PID:1940
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nuuyzjte.exe" C:\Windows\SysWOW64\fupzsobb\
  2⤵
  PID:1740
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create fupzsobb binPath= "C:\Windows\SysWOW64\fupzsobb\nuuyzjte.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2032
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description fupzsobb "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1344
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start fupzsobb
  2⤵
  - Launches sc.exe
  PID:868
- 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:1144

C:\Windows\SysWOW64\fupzsobb\nuuyzjte.exe
C:\Windows\SysWOW64\fupzsobb\nuuyzjte.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:848
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:1824

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

nuuyzjte.exe

Path C:\Users\Admin\AppData\Local\Temp\nuuyzjte.exe
Size 14.4MB
SHA256 0c31ca5db84e36cf704ba1ff26071e094e6d15cfdbc6f0fe040d67d7954a106e
MD5 b1ce649de836d40cb40e56cc96c0e3e0
SHA1 98b7ef213704a37bff28755d3d45bb4bd021ca2a
SHA512 fc626f37eaaba4d5675fcdc72e6446f328043d6ce9e41e4cdbeabe20b87f406ee589ca30f4fec0348b1b6472b5d89193c133c456bb94349da041a5d1aaa26667
SSDEEP 6144:sfj9OSii9lPSGYSxRPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUX:sfHii9l7YS
MD5 SHA1 SHA512 SSDEEP

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nuuyzjte.exe

Path C:\Windows\SysWOW64\fupzsobb\nuuyzjte.exe
Size 14.4MB
SHA256 0c31ca5db84e36cf704ba1ff26071e094e6d15cfdbc6f0fe040d67d7954a106e
MD5 b1ce649de836d40cb40e56cc96c0e3e0
SHA1 98b7ef213704a37bff28755d3d45bb4bd021ca2a
SHA512 fc626f37eaaba4d5675fcdc72e6446f328043d6ce9e41e4cdbeabe20b87f406ee589ca30f4fec0348b1b6472b5d89193c133c456bb94349da041a5d1aaa26667
SSDEEP 6144:sfj9OSii9lPSGYSxRPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUPUX:sfHii9l7YS
MD5 SHA1 SHA512 SSDEEP

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memory/848-77-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/848-75-0x00000000005FB000-0x000000000060E000-memory.dmp

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memory/1672-54-0x00000000753C1000-0x00000000753C3000-memory.dmp

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memory/1672-58-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/1672-56-0x000000000028B000-0x000000000029E000-memory.dmp

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memory/1672-67-0x0000000000400000-0x000000000055E000-memory.dmp

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memory/1672-57-0x00000000001B0000-0x00000000001C3000-memory.dmp

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memory/1672-66-0x000000000028B000-0x000000000029E000-memory.dmp

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memory/1824-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1824-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1824-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/1824-80-0x0000000000080000-0x0000000000095000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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