tofsee | efec07fbc1d3df82dc8f39c152f8d74da43ce2df373166952c9a1db3abf4135f

Analysis

max time kernel
149s
max time network
142s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
09/01/2023, 06:07

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General

Target
file.exe
Size 354KB
Sample230109-gvbgeadb77
SHA256 efec07fbc1d3df82dc8f39c152f8d74da43ce2df373166952c9a1db3abf4135f
MD5 2e40b706f95e6b545a19a7cb3b7f4e35
SHA1 7d5f3f05c5b9f16b972a5af6bbb0d80af0b7d5b2
SHA512 2634757e7376e5a3ff990ec970153f77228772c9fab566a8583ac9b2877d307fa0df91a263ed3e6d34a6f0011ab821da47bcb0a1bb386dc08679c14247840554
SSDEEP 6144:pWy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:pWy8i53hLogrj1cFtt++g
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\twvyfkrl = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Executes dropped EXE 1 IoCs

pid	Process
760	mskzexo.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
860	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\twvyfkrl\ImagePath = "C:\\Windows\\SysWOW64\\twvyfkrl\\mskzexo.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
992	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 760 set thread context of 992	760	mskzexo.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
468	sc.exe
1476	sc.exe
1768	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 2040 wrote to memory of 948	2040	file.exe	28
PID 2040 wrote to memory of 948	2040	file.exe	28
PID 2040 wrote to memory of 948	2040	file.exe	28
PID 2040 wrote to memory of 948	2040	file.exe	28
PID 2040 wrote to memory of 1484	2040	file.exe	30
PID 2040 wrote to memory of 1484	2040	file.exe	30
PID 2040 wrote to memory of 1484	2040	file.exe	30
PID 2040 wrote to memory of 1484	2040	file.exe	30
PID 2040 wrote to memory of 468	2040	file.exe	32
PID 2040 wrote to memory of 468	2040	file.exe	32
PID 2040 wrote to memory of 468	2040	file.exe	32
PID 2040 wrote to memory of 468	2040	file.exe	32
PID 2040 wrote to memory of 1476	2040	file.exe	34
PID 2040 wrote to memory of 1476	2040	file.exe	34
PID 2040 wrote to memory of 1476	2040	file.exe	34
PID 2040 wrote to memory of 1476	2040	file.exe	34
PID 2040 wrote to memory of 1768	2040	file.exe	36
PID 2040 wrote to memory of 1768	2040	file.exe	36
PID 2040 wrote to memory of 1768	2040	file.exe	36
PID 2040 wrote to memory of 1768	2040	file.exe	36
PID 2040 wrote to memory of 860	2040	file.exe	39
PID 2040 wrote to memory of 860	2040	file.exe	39
PID 2040 wrote to memory of 860	2040	file.exe	39
PID 2040 wrote to memory of 860	2040	file.exe	39
PID 760 wrote to memory of 992	760	mskzexo.exe	41
PID 760 wrote to memory of 992	760	mskzexo.exe	41
PID 760 wrote to memory of 992	760	mskzexo.exe	41
PID 760 wrote to memory of 992	760	mskzexo.exe	41
PID 760 wrote to memory of 992	760	mskzexo.exe	41
PID 760 wrote to memory of 992	760	mskzexo.exe	41

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2040
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\twvyfkrl\
  2⤵
  PID:948
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mskzexo.exe" C:\Windows\SysWOW64\twvyfkrl\
  2⤵
  PID:1484
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create twvyfkrl binPath= "C:\Windows\SysWOW64\twvyfkrl\mskzexo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:468
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description twvyfkrl "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1476
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start twvyfkrl
  2⤵
  - Launches sc.exe
  PID:1768
- 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:860

C:\Windows\SysWOW64\twvyfkrl\mskzexo.exe
C:\Windows\SysWOW64\twvyfkrl\mskzexo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:760
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:992

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

mskzexo.exe

Path C:\Users\Admin\AppData\Local\Temp\mskzexo.exe
Size 12.7MB
SHA256 414d8817342ee8e464cceeb820956341a44d033a78d0d66f731e9f58a2740c2a
MD5 fda4c6c8298e6af5046d2cbf0a5ac3c1
SHA1 ebb26cfe1be8a98f5e68bedf769035ab02c09dda
SHA512 b3a24b2dab0ed63cee15aa3913afd069d8f66c17838e8d6c2920efaeb61da41264e68acbbdf093c275cfe6ded511a908a2ad7693d5b4392b1d02ddf4fe5fc927
SSDEEP 6144:/Wy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:/Wy8i53hLogrj1cFtt++g
MD5 SHA1 SHA512 SSDEEP

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mskzexo.exe

Path C:\Windows\SysWOW64\twvyfkrl\mskzexo.exe
Size 12.7MB
SHA256 414d8817342ee8e464cceeb820956341a44d033a78d0d66f731e9f58a2740c2a
MD5 fda4c6c8298e6af5046d2cbf0a5ac3c1
SHA1 ebb26cfe1be8a98f5e68bedf769035ab02c09dda
SHA512 b3a24b2dab0ed63cee15aa3913afd069d8f66c17838e8d6c2920efaeb61da41264e68acbbdf093c275cfe6ded511a908a2ad7693d5b4392b1d02ddf4fe5fc927
SSDEEP 6144:/Wy8FsrlLDhLogHj30Kv1Yb1FVMWRFCFuedbe++g:/Wy8i53hLogrj1cFtt++g
MD5 SHA1 SHA512 SSDEEP

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memory/760-78-0x0000000000400000-0x000000000301B000-memory.dmp

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memory/760-75-0x00000000030CB000-0x00000000030E1000-memory.dmp

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memory/992-70-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/992-80-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/992-79-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/992-72-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2040-58-0x0000000000400000-0x000000000301B000-memory.dmp

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memory/2040-67-0x0000000000400000-0x000000000301B000-memory.dmp

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memory/2040-66-0x000000000310B000-0x0000000003121000-memory.dmp

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memory/2040-54-0x0000000074E61000-0x0000000074E63000-memory.dmp

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memory/2040-56-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/2040-55-0x000000000310B000-0x0000000003121000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads