tofsee | 53c6ebd75518ed05b22ab762b476f48313b700283358dccb7d55b02f29cfe462

General

Target

file.exe
Size

292KB
MD5

4e39579f1251ae570e145e352e7393f7
SHA1

07497b310187f77e2c18364c7a0e31068be822d1
SHA256

53c6ebd75518ed05b22ab762b476f48313b700283358dccb7d55b02f29cfe462
SHA512

29dd728463e77e3988a074a97b36ebba3f0876e684ea96746b3ec0aeaf78e4ee25182b34a51900b6400fd8a22ea9a911bb15ae195bd04419f8303b9412920009
SSDEEP

3072:Xk6e+HiNFjbrieXWP72/BRczZpgAhtBE3k2Bxz+4a2GMW/ft/Dr05xK:7zkjbrFi78BkpgKC3z2YK

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

1632 netsh.exe

pid	process
1632	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\cacywmjv\ImagePath = "C:\\Windows\\SysWOW64\\cacywmjv\\jsyjhwo.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

file.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

jsyjhwo.exe

pid process

1508 jsyjhwo.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:

jsyjhwo.exe

description pid process target process

PID 1508 set thread context of 4824 1508 jsyjhwo.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

3240 sc.exe
1164 sc.exe
4168 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

1144 1772 WerFault.exe file.exe
952 1508 WerFault.exe jsyjhwo.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
1508	jsyjhwo.exe

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

description	pid	process	target process
PID 1508 set thread context of 4824	1508	jsyjhwo.exe	svchost.exe

pid	process
3240	sc.exe
1164	sc.exe
4168	sc.exe

pid	pid_target	process	target process
1144	1772	WerFault.exe	file.exe
952	1508	WerFault.exe	jsyjhwo.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 23 IoCs

Processes:

file.exejsyjhwo.exe

description	pid	process	target process
PID 1772 wrote to memory of 4812	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 4812	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 4812	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 4952	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 4952	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 4952	1772	file.exe	cmd.exe
PID 1772 wrote to memory of 3240	1772	file.exe	sc.exe
PID 1772 wrote to memory of 3240	1772	file.exe	sc.exe
PID 1772 wrote to memory of 3240	1772	file.exe	sc.exe
PID 1772 wrote to memory of 1164	1772	file.exe	sc.exe
PID 1772 wrote to memory of 1164	1772	file.exe	sc.exe
PID 1772 wrote to memory of 1164	1772	file.exe	sc.exe
PID 1772 wrote to memory of 4168	1772	file.exe	sc.exe
PID 1772 wrote to memory of 4168	1772	file.exe	sc.exe
PID 1772 wrote to memory of 4168	1772	file.exe	sc.exe
PID 1772 wrote to memory of 1632	1772	file.exe	netsh.exe
PID 1772 wrote to memory of 1632	1772	file.exe	netsh.exe
PID 1772 wrote to memory of 1632	1772	file.exe	netsh.exe
PID 1508 wrote to memory of 4824	1508	jsyjhwo.exe	svchost.exe
PID 1508 wrote to memory of 4824	1508	jsyjhwo.exe	svchost.exe
PID 1508 wrote to memory of 4824	1508	jsyjhwo.exe	svchost.exe
PID 1508 wrote to memory of 4824	1508	jsyjhwo.exe	svchost.exe
PID 1508 wrote to memory of 4824	1508	jsyjhwo.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1772

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cacywmjv\
2⤵
PID:4812

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jsyjhwo.exe" C:\Windows\SysWOW64\cacywmjv\
2⤵
PID:4952

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create cacywmjv binPath= "C:\Windows\SysWOW64\cacywmjv\jsyjhwo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3240

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description cacywmjv "wifi internet conection"
2⤵
- Launches sc.exe
PID:1164

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start cacywmjv
2⤵
- Launches sc.exe
PID:4168

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:1632

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1772 -s 1248
2⤵
- Program crash
PID:1144

C:\Windows\SysWOW64\cacywmjv\jsyjhwo.exe
C:\Windows\SysWOW64\cacywmjv\jsyjhwo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1508

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:4824

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1508 -s 528
2⤵
- Program crash
PID:952

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 1772 -ip 1772
1⤵
PID:1520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 400 -p 1508 -ip 1508
1⤵
PID:488

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\jsyjhwo.exe
Filesize
11.9MB

MD5
075f783f9a53837a0a52aaa3a9841dfc

SHA1
ef3707631f6fb417fc61e0ba56ab7a9d70621c67

SHA256
098e69de444ce778b9dae89679220e7a45d93413baea0c1c49fe4f17a8c3defb

SHA512
a2c07f5974037fb3b9e77ce97e50f46a8416368f4857f21fdf2ded9e46df79edd210e8abbaee9ef8ed421ced0d794a1d0437f9f5963b7722361b89e09806f6a3

Download Submit
C:\Windows\SysWOW64\cacywmjv\jsyjhwo.exe
Filesize
11.9MB

MD5
075f783f9a53837a0a52aaa3a9841dfc

SHA1
ef3707631f6fb417fc61e0ba56ab7a9d70621c67

SHA256
098e69de444ce778b9dae89679220e7a45d93413baea0c1c49fe4f17a8c3defb

SHA512
a2c07f5974037fb3b9e77ce97e50f46a8416368f4857f21fdf2ded9e46df79edd210e8abbaee9ef8ed421ced0d794a1d0437f9f5963b7722361b89e09806f6a3

Download Submit
memory/1508-146-0x0000000000400000-0x00000000006C7000-memory.dmp

Filesize
2.8MB

Download
memory/1772-136-0x0000000000840000-0x0000000000853000-memory.dmp

Filesize
76KB

Download
memory/1772-139-0x0000000000400000-0x00000000006C7000-memory.dmp

Filesize
2.8MB

Download
memory/4824-141-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

Filesize
84KB

Download
memory/4824-144-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

Filesize
84KB

Download
memory/4824-145-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

Filesize
84KB

Download
memory/4824-147-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

Filesize
84KB

Download
memory/4824-149-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads