tofsee | 1890d57705b8ac4dc77408a7cc539762f7350a590a688769cb9eca5a8618b361

General

Target

file.exe
Size

298KB
MD5

98b872988fa30b5ba4d24a280b632d8a
SHA1

efeb96fab9b2e9160b9944cefe1062fc714a5ffa
SHA256

1890d57705b8ac4dc77408a7cc539762f7350a590a688769cb9eca5a8618b361
SHA512

05e80f8bef6fc60ab034011593ab106a6fa77c7d21d27515e92ea8423dd9ae86c5057b4d95beea63f0ac8875fad2037dd147a3d12fa35dbf97c85dc1f9a6e256
SSDEEP

6144:bUuMIPLZ4aqf5BvHIIv+/3GQ2eRcsBtcq:bU7IPl4aaBHZ+/3GQnzBt

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

1616 netsh.exe
Executes dropped EXE 1 IoCs

Processes:

xnnkwiyw.exe

pid process

1764 xnnkwiyw.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

xnnkwiyw.exe

description pid process target process

PID 1764 set thread context of 896 1764 xnnkwiyw.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

684 sc.exe
668 sc.exe
1700 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1616	netsh.exe

pid	process
1764	xnnkwiyw.exe

description	pid	process	target process
PID 1764 set thread context of 896	1764	xnnkwiyw.exe	svchost.exe

pid	process
684	sc.exe
668	sc.exe
1700	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exexnnkwiyw.exe

description	pid	process	target process
PID 1736 wrote to memory of 2036	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 2036	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 2036	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 2036	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 1940	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 1940	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 1940	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 1940	1736	file.exe	cmd.exe
PID 1736 wrote to memory of 684	1736	file.exe	sc.exe
PID 1736 wrote to memory of 684	1736	file.exe	sc.exe
PID 1736 wrote to memory of 684	1736	file.exe	sc.exe
PID 1736 wrote to memory of 684	1736	file.exe	sc.exe
PID 1736 wrote to memory of 668	1736	file.exe	sc.exe
PID 1736 wrote to memory of 668	1736	file.exe	sc.exe
PID 1736 wrote to memory of 668	1736	file.exe	sc.exe
PID 1736 wrote to memory of 668	1736	file.exe	sc.exe
PID 1736 wrote to memory of 1700	1736	file.exe	sc.exe
PID 1736 wrote to memory of 1700	1736	file.exe	sc.exe
PID 1736 wrote to memory of 1700	1736	file.exe	sc.exe
PID 1736 wrote to memory of 1700	1736	file.exe	sc.exe
PID 1736 wrote to memory of 1616	1736	file.exe	netsh.exe
PID 1736 wrote to memory of 1616	1736	file.exe	netsh.exe
PID 1736 wrote to memory of 1616	1736	file.exe	netsh.exe
PID 1736 wrote to memory of 1616	1736	file.exe	netsh.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.exe	svchost.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.exe	svchost.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.exe	svchost.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.exe	svchost.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.exe	svchost.exe
PID 1764 wrote to memory of 896	1764	xnnkwiyw.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:1736

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gdlzxiqc\
2⤵
PID:2036

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe" C:\Windows\SysWOW64\gdlzxiqc\
2⤵
PID:1940

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create gdlzxiqc binPath= "C:\Windows\SysWOW64\gdlzxiqc\xnnkwiyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:684

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description gdlzxiqc "wifi internet conection"
2⤵
- Launches sc.exe
PID:668

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start gdlzxiqc
2⤵
- Launches sc.exe
PID:1700

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:1616

C:\Windows\SysWOW64\gdlzxiqc\xnnkwiyw.exe
C:\Windows\SysWOW64\gdlzxiqc\xnnkwiyw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1764

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
PID:896

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\xnnkwiyw.exe
Filesize
14.7MB

MD5
507353a49a14c8e3a65e9f72f73f892c

SHA1
d089122b9f6a42fdb24495ef21d351aebd1b9939

SHA256
a4e002ade7c7e6e73165865b1b9aa1ae9b1ef2ad31b4c5174e347617a976f0b8

SHA512
715137967457d34a90895eb801e3100a7ff09fbaf30952ce8e5d00f44bea3089b2225df34731698eefe4b928a9f6f453bd40b2370683a211dfb980f6c34cb0c7

Download Submit
C:\Windows\SysWOW64\gdlzxiqc\xnnkwiyw.exe
Filesize
14.7MB

MD5
507353a49a14c8e3a65e9f72f73f892c

SHA1
d089122b9f6a42fdb24495ef21d351aebd1b9939

SHA256
a4e002ade7c7e6e73165865b1b9aa1ae9b1ef2ad31b4c5174e347617a976f0b8

SHA512
715137967457d34a90895eb801e3100a7ff09fbaf30952ce8e5d00f44bea3089b2225df34731698eefe4b928a9f6f453bd40b2370683a211dfb980f6c34cb0c7

Download Submit
memory/896-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/896-61-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/896-63-0x00000000000D0000-0x00000000000E5000-memory.dmp

Filesize
84KB

Download
memory/1736-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1736-60-0x0000000000400000-0x0000000002367000-memory.dmp

Filesize
31.4MB

Download
memory/1764-65-0x0000000000400000-0x0000000002367000-memory.dmp

Filesize
31.4MB

Download

Analysis

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