tofsee | 8cc3efde2ca85f0d6fcb6c96beb65869fdf024b3f948c1de79194e7988446a48

General

Target

file.exe
Size

322KB
MD5

c5b9c27223bd12c6e6a0c46e5b411e27
SHA1

68a98a64db6df5bd1feb25288220d186da8fd718
SHA256

8cc3efde2ca85f0d6fcb6c96beb65869fdf024b3f948c1de79194e7988446a48
SHA512

a3d3cdb3b4b1ba88000fc458a4def99973d4a0794b9e85bd0f156643c925f3baaebe9f3a900f8b260568af484671c6c0d541e7403a6d7075a1783088ba630299
SSDEEP

3072:1KPtaVfzJ+xzpxIUgpnvKxvGbqqV7gPCs5lQYFwGfABn/9vOsJp7t:QetWkUIy4bVyCs5ZQ/OI

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

New Service
T1050
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1820 netsh.exe
Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1692 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

ywghjfio.exe

pid process

1268 ywghjfio.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

ywghjfio.exe

description pid process target process

PID 1268 set thread context of 1692 1268 ywghjfio.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

1316 sc.exe
1920 sc.exe
1496 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1820	netsh.exe

pid	process
1692	svchost.exe

pid	process
1268	ywghjfio.exe

description	pid	process	target process
PID 1268 set thread context of 1692	1268	ywghjfio.exe	svchost.exe

pid	process
1316	sc.exe
1920	sc.exe
1496	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeywghjfio.exe

description	pid	process	target process
PID 1104 wrote to memory of 1688	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1688	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1688	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1688	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1248	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1248	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1248	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1248	1104	file.exe	cmd.exe
PID 1104 wrote to memory of 1316	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1316	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1316	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1316	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1920	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1920	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1920	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1920	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1496	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1496	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1496	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1496	1104	file.exe	sc.exe
PID 1104 wrote to memory of 1820	1104	file.exe	netsh.exe
PID 1104 wrote to memory of 1820	1104	file.exe	netsh.exe
PID 1104 wrote to memory of 1820	1104	file.exe	netsh.exe
PID 1104 wrote to memory of 1820	1104	file.exe	netsh.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.exe	svchost.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.exe	svchost.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.exe	svchost.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.exe	svchost.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.exe	svchost.exe
PID 1268 wrote to memory of 1692	1268	ywghjfio.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:1104

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ucrkxkmm\
2⤵
PID:1688

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ywghjfio.exe" C:\Windows\SysWOW64\ucrkxkmm\
2⤵
PID:1248

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ucrkxkmm binPath= "C:\Windows\SysWOW64\ucrkxkmm\ywghjfio.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1316

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ucrkxkmm "wifi internet conection"
2⤵
- Launches sc.exe
PID:1920

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ucrkxkmm
2⤵
- Launches sc.exe
PID:1496

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:1820

C:\Windows\SysWOW64\ucrkxkmm\ywghjfio.exe
C:\Windows\SysWOW64\ucrkxkmm\ywghjfio.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1268

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Deletes itself
PID:1692

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Privilege Escalation

New Service

1

T1050

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\ywghjfio.exe
Filesize
14.4MB

MD5
d5614f80f160946c0d30cc61da3076b2

SHA1
f5a17eb3ef46bf48f0ec9bcb9303f926c132b190

SHA256
a6b5bc702edca55e7e5483307b8f233e0ae448fbbbff6ada9f4b5fefa9ee4108

SHA512
1b83a3e5a0ffabad59ce2be3d96613ae920d0f90f54b4332a5c70227948324074b38f95866dd43a05d2e85c93b62b249813b4e7f5c005f28ecc6dba0d91e1b98

Download Submit
C:\Windows\SysWOW64\ucrkxkmm\ywghjfio.exe
Filesize
14.4MB

MD5
d5614f80f160946c0d30cc61da3076b2

SHA1
f5a17eb3ef46bf48f0ec9bcb9303f926c132b190

SHA256
a6b5bc702edca55e7e5483307b8f233e0ae448fbbbff6ada9f4b5fefa9ee4108

SHA512
1b83a3e5a0ffabad59ce2be3d96613ae920d0f90f54b4332a5c70227948324074b38f95866dd43a05d2e85c93b62b249813b4e7f5c005f28ecc6dba0d91e1b98

Download Submit
memory/1104-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1104-60-0x0000000000400000-0x00000000006CE000-memory.dmp

Filesize
2.8MB

Download
memory/1268-65-0x0000000000400000-0x00000000006CE000-memory.dmp

Filesize
2.8MB

Download
memory/1692-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1692-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1692-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1692-61-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download

Analysis

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