tofsee | dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963

General

Target

file.exe
Size

147KB
MD5

245a32c6b70bf744448625ca6d897a57
SHA1

67a7ca7893d555651eb6a38bc22fb9aeacffcec2
SHA256

dc0ec3405d05046753c376f33fcd545d03b4781983d4b26103de9419b4334963
SHA512

aa40eb9fd15e087b346086421b6efdbecc97980868d1404fa32e8ca90a118f3986aef668554ba67badf1dc58ef88c1d688ebe193fed3d3f5dd435d392d3665af
SSDEEP

3072:GFuoANbriTl655frf0zvNDoM2bTXtFW5mMSjv:JbbrHT0zxnoTeo

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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

Processes:

svchost.exe

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

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

qkmuqkqj.exe

pid process

788 qkmuqkqj.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

928 netsh.exe

pid	process
788	qkmuqkqj.exe

pid	process
928	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\yuxwqmkr\ImagePath = "C:\\Windows\\SysWOW64\\yuxwqmkr\\qkmuqkqj.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

360 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

qkmuqkqj.exe

description pid process target process

PID 788 set thread context of 360 788 qkmuqkqj.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

1732 sc.exe
1708 sc.exe
1564 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
360	svchost.exe

description	pid	process	target process
PID 788 set thread context of 360	788	qkmuqkqj.exe	svchost.exe

pid	process
1732	sc.exe
1708	sc.exe
1564	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeqkmuqkqj.exe

description	pid	process	target process
PID 1284 wrote to memory of 984	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 984	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 984	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 984	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 1336	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 1336	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 1336	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 1336	1284	file.exe	cmd.exe
PID 1284 wrote to memory of 1732	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1732	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1732	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1732	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1708	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1708	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1708	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1708	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1564	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1564	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1564	1284	file.exe	sc.exe
PID 1284 wrote to memory of 1564	1284	file.exe	sc.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe
PID 1284 wrote to memory of 928	1284	file.exe	netsh.exe
PID 1284 wrote to memory of 928	1284	file.exe	netsh.exe
PID 1284 wrote to memory of 928	1284	file.exe	netsh.exe
PID 1284 wrote to memory of 928	1284	file.exe	netsh.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe
PID 788 wrote to memory of 360	788	qkmuqkqj.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1284
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yuxwqmkr\
  2⤵
  PID:984
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qkmuqkqj.exe" C:\Windows\SysWOW64\yuxwqmkr\
  2⤵
  PID:1336
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yuxwqmkr binPath= "C:\Windows\SysWOW64\yuxwqmkr\qkmuqkqj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1732
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yuxwqmkr "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1708
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yuxwqmkr
  2⤵
  - Launches sc.exe
  PID:1564
- 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:928

C:\Windows\SysWOW64\yuxwqmkr\qkmuqkqj.exe
C:\Windows\SysWOW64\yuxwqmkr\qkmuqkqj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:788
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:360

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
10.9MB

MD5
f6535cf2ae1469b07798b5e3c5fc5438

SHA1
ec7eed0e3163af0a3d4050c3da0be66c7ab3aee4

SHA256
79a83e15011d780f1ff47d2772b71b87b0a8e72a9ccc7d4d20545d78a9e7e994

SHA512
851b34ad7c7df9eae8357e235a7ccecc6c8132eb2493f91449b5a01a7c190372e717876ab355a9faf7e266451d2f1668681f28a30b1836283a54f7826f9135e0

Download Submit
C:\Windows\SysWOW64\yuxwqmkr\qkmuqkqj.exe

Filesize
10.9MB

MD5
f6535cf2ae1469b07798b5e3c5fc5438

SHA1
ec7eed0e3163af0a3d4050c3da0be66c7ab3aee4

SHA256
79a83e15011d780f1ff47d2772b71b87b0a8e72a9ccc7d4d20545d78a9e7e994

SHA512
851b34ad7c7df9eae8357e235a7ccecc6c8132eb2493f91449b5a01a7c190372e717876ab355a9faf7e266451d2f1668681f28a30b1836283a54f7826f9135e0

Download Submit
memory/360-72-0x00000000000C9A6B-mapping.dmp

Download
memory/360-66-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/360-80-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/360-79-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/360-70-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/788-77-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/788-76-0x0000000000BCB000-0x0000000000BDC000-memory.dmp

Filesize
68KB

Download
memory/928-67-0x0000000000000000-mapping.dmp

Download
memory/984-58-0x0000000000000000-mapping.dmp

Download
memory/1284-54-0x00000000762E1000-0x00000000762E3000-memory.dmp

Filesize
8KB

Download
memory/1284-69-0x0000000000F5B000-0x0000000000F6C000-memory.dmp

Filesize
68KB

Download
memory/1284-55-0x0000000000F5B000-0x0000000000F6C000-memory.dmp

Filesize
68KB

Download
memory/1284-57-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1284-71-0x0000000000400000-0x0000000000AD6000-memory.dmp

Filesize
6.8MB

Download
memory/1284-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1336-59-0x0000000000000000-mapping.dmp

Download
memory/1564-63-0x0000000000000000-mapping.dmp

Download
memory/1708-62-0x0000000000000000-mapping.dmp

Download
memory/1732-61-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads