tofsee | 781d970efbd869d9f9d6133d4c5fd95e886be5d865be20520c4c9b646292a114

General

Target

file.exe
Size

213KB
MD5

d2094e5b150e93824c03c5de2a70a6f3
SHA1

aec0ad2bba9c795f70a192f67a48b049ebfc1b4a
SHA256

781d970efbd869d9f9d6133d4c5fd95e886be5d865be20520c4c9b646292a114
SHA512

49094072b9f3a1e21b0c8d234ce1585a77c627567beba58c4ce3816546eeab634e702d33795b52b29576d6b7feb0a9ee422304bd41110987169568ab37386e60
SSDEEP

6144:NB4zZU424TLgM23XjrgmETzpU3LvUUUv7iM:7cZY4TUM23TqV7

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

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\jcigdgpc = "0"	svchost.exe

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

1516 netsh.exe

pid	process
1516	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\jcigdgpc\ImagePath = "C:\\Windows\\SysWOW64\\jcigdgpc\\hkdooxyy.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1096 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

hkdooxyy.exe

pid process

568 hkdooxyy.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:

hkdooxyy.exe

description pid process target process

PID 568 set thread context of 1096 568 hkdooxyy.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

1640 sc.exe
756 sc.exe
676 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
1096	svchost.exe

pid	process
568	hkdooxyy.exe

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

description	pid	process	target process
PID 568 set thread context of 1096	568	hkdooxyy.exe	svchost.exe

pid	process
1640	sc.exe
756	sc.exe
676	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

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

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exehkdooxyy.exe

description	pid	process	target process
PID 1352 wrote to memory of 1112	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 1112	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 1112	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 1112	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 904	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 904	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 904	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 904	1352	file.exe	cmd.exe
PID 1352 wrote to memory of 1640	1352	file.exe	sc.exe
PID 1352 wrote to memory of 1640	1352	file.exe	sc.exe
PID 1352 wrote to memory of 1640	1352	file.exe	sc.exe
PID 1352 wrote to memory of 1640	1352	file.exe	sc.exe
PID 1352 wrote to memory of 756	1352	file.exe	sc.exe
PID 1352 wrote to memory of 756	1352	file.exe	sc.exe
PID 1352 wrote to memory of 756	1352	file.exe	sc.exe
PID 1352 wrote to memory of 756	1352	file.exe	sc.exe
PID 1352 wrote to memory of 676	1352	file.exe	sc.exe
PID 1352 wrote to memory of 676	1352	file.exe	sc.exe
PID 1352 wrote to memory of 676	1352	file.exe	sc.exe
PID 1352 wrote to memory of 676	1352	file.exe	sc.exe
PID 1352 wrote to memory of 1516	1352	file.exe	netsh.exe
PID 1352 wrote to memory of 1516	1352	file.exe	netsh.exe
PID 1352 wrote to memory of 1516	1352	file.exe	netsh.exe
PID 1352 wrote to memory of 1516	1352	file.exe	netsh.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.exe	svchost.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.exe	svchost.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.exe	svchost.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.exe	svchost.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.exe	svchost.exe
PID 568 wrote to memory of 1096	568	hkdooxyy.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:1352

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jcigdgpc\
2⤵
PID:1112

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hkdooxyy.exe" C:\Windows\SysWOW64\jcigdgpc\
2⤵
PID:904

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create jcigdgpc binPath= "C:\Windows\SysWOW64\jcigdgpc\hkdooxyy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1640

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description jcigdgpc "wifi internet conection"
2⤵
- Launches sc.exe
PID:756

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start jcigdgpc
2⤵
- Launches sc.exe
PID:676

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:1516

C:\Windows\SysWOW64\jcigdgpc\hkdooxyy.exe
C:\Windows\SysWOW64\jcigdgpc\hkdooxyy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:568

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:1096

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\hkdooxyy.exe
Filesize
13.2MB

MD5
e1fc9d291fc660e52c651d8f61d5ee07

SHA1
bc517bc3038645501dfa933c4e254abb6c27620a

SHA256
2bddedb59cfe1056db747f778f60846fe324c8abb0f419dbc56fcfbf290fb9ef

SHA512
9337f929167e8ef622e6782e0202035d4df5f70afd5336ecaeca9ec1b7963b7b0691386e3c43ecb5a6f1412717732c4e2254381dfdc04dee687b1771e39a1bad

Download Submit
C:\Windows\SysWOW64\jcigdgpc\hkdooxyy.exe
Filesize
13.2MB

MD5
e1fc9d291fc660e52c651d8f61d5ee07

SHA1
bc517bc3038645501dfa933c4e254abb6c27620a

SHA256
2bddedb59cfe1056db747f778f60846fe324c8abb0f419dbc56fcfbf290fb9ef

SHA512
9337f929167e8ef622e6782e0202035d4df5f70afd5336ecaeca9ec1b7963b7b0691386e3c43ecb5a6f1412717732c4e2254381dfdc04dee687b1771e39a1bad

Download Submit
memory/568-64-0x0000000000400000-0x00000000004A2000-memory.dmp

Filesize
648KB

Download
memory/1096-61-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1096-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1096-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1096-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1096-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1096-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1096-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1352-56-0x00000000001D0000-0x00000000001E3000-memory.dmp

Filesize
76KB

Download
memory/1352-60-0x0000000000400000-0x00000000004A2000-memory.dmp

Filesize
648KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads