tofsee | 31694d3e383f1c51e4589ec887a743ccae80ab1ec0c629a9267e8d1c892179d6

General

Target

3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe
Size

203KB
MD5

e80ed6ccb333b7fc33ffc98bca43b57d
SHA1

170281a608fe94eee06a9f45466f6a47bd2272e3
SHA256

3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3
SHA512

3209c004cebb1e2f544f7d8457175a62da8a225bc08bcbb051c240eddc610ca8e1ddfe7f6d758d2e09517030afad689b6805fc2b8b801a1f182c04369191a30d
SSDEEP

3072:eafjdfYraZJXENc8uCXJiXK1K2LEpzUCV+PaIh9bwdANblLNBNKRrxbU+cmH:eafjqQ15OCyLLkCVkxbDco

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

2696 netsh.exe

pid	process
2696	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

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

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2392 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

ecmnplou.exe

pid process

2524 ecmnplou.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ecmnplou.exe

description pid process target process

PID 2524 set thread context of 2392 2524 ecmnplou.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

2492 sc.exe
2568 sc.exe
2644 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2392	svchost.exe

pid	process
2524	ecmnplou.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 2524 set thread context of 2392	2524	ecmnplou.exe	svchost.exe

pid	process
2492	sc.exe
2568	sc.exe
2644	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exeecmnplou.exe

description	pid	process	target process
PID 2860 wrote to memory of 2244	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2244	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2244	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2244	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2488	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2488	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2488	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2488	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	cmd.exe
PID 2860 wrote to memory of 2644	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2644	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2644	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2644	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2492	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2492	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2492	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2492	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2568	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2568	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2568	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2568	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	sc.exe
PID 2860 wrote to memory of 2696	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	netsh.exe
PID 2860 wrote to memory of 2696	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	netsh.exe
PID 2860 wrote to memory of 2696	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	netsh.exe
PID 2860 wrote to memory of 2696	2860	3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe	netsh.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe
PID 2524 wrote to memory of 2392	2524	ecmnplou.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe
"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2860

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vymnjkxn\
2⤵
PID:2244

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ecmnplou.exe" C:\Windows\SysWOW64\vymnjkxn\
2⤵
PID:2488

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create vymnjkxn binPath= "C:\Windows\SysWOW64\vymnjkxn\ecmnplou.exe /d\"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2644

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description vymnjkxn "wifi internet conection"
2⤵
- Launches sc.exe
PID:2492

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start vymnjkxn
2⤵
- Launches sc.exe
PID:2568

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:2696

C:\Windows\SysWOW64\vymnjkxn\ecmnplou.exe
C:\Windows\SysWOW64\vymnjkxn\ecmnplou.exe /d"C:\Users\Admin\AppData\Local\Temp\3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2524

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2392

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify System Firewall

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\ecmnplou.exe
Filesize
12.8MB

MD5
2efffabe1a12e95c436b2bbf32936818

SHA1
d10a4e877f21f37afbb03a77bd132820b30db69d

SHA256
b2e803a310e538742d33cc2dcb5241cf95c36df5999b338acfe6303fac9adf17

SHA512
fa556f10921b88e0dcbb17453150cee9ff03e0aafeca85b3dab4530ff2a720a1649525a1f34459cb25f07c3456b2db3516752691e46ae82aeef8ad4d91bd4bff

Download Submit
memory/2392-28-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2392-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2392-34-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2392-33-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2392-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2392-32-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2524-11-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2524-14-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2524-16-0x00000000005E0000-0x00000000006E0000-memory.dmp

Filesize
1024KB

Download
memory/2524-29-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2524-10-0x00000000005E0000-0x00000000006E0000-memory.dmp

Filesize
1024KB

Download
memory/2860-3-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2860-7-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2860-1-0x0000000000520000-0x0000000000620000-memory.dmp

Filesize
1024KB

Download
memory/2860-6-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/2860-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads