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

2900 netsh.exe

pid	process
2900	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\bnsylhfz\ImagePath = "C:\\Windows\\SysWOW64\\bnsylhfz\\lxfcivbz.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:

lxfcivbz.exe

pid process

3500 lxfcivbz.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:

lxfcivbz.exe

description pid process target process

PID 3500 set thread context of 3888 3500 lxfcivbz.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

224 sc.exe
2612 sc.exe
1696 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

4436 5032 WerFault.exe file.exe
2708 3500 WerFault.exe lxfcivbz.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
3500	lxfcivbz.exe

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

description	pid	process	target process
PID 3500 set thread context of 3888	3500	lxfcivbz.exe	svchost.exe

pid	process
224	sc.exe
2612	sc.exe
1696	sc.exe

pid	pid_target	process	target process
4436	5032	WerFault.exe	file.exe
2708	3500	WerFault.exe	lxfcivbz.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.exelxfcivbz.exe

description	pid	process	target process
PID 5032 wrote to memory of 2120	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 2120	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 2120	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 4024	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 4024	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 4024	5032	file.exe	cmd.exe
PID 5032 wrote to memory of 224	5032	file.exe	sc.exe
PID 5032 wrote to memory of 224	5032	file.exe	sc.exe
PID 5032 wrote to memory of 224	5032	file.exe	sc.exe
PID 5032 wrote to memory of 2612	5032	file.exe	sc.exe
PID 5032 wrote to memory of 2612	5032	file.exe	sc.exe
PID 5032 wrote to memory of 2612	5032	file.exe	sc.exe
PID 5032 wrote to memory of 1696	5032	file.exe	sc.exe
PID 5032 wrote to memory of 1696	5032	file.exe	sc.exe
PID 5032 wrote to memory of 1696	5032	file.exe	sc.exe
PID 5032 wrote to memory of 2900	5032	file.exe	netsh.exe
PID 5032 wrote to memory of 2900	5032	file.exe	netsh.exe
PID 5032 wrote to memory of 2900	5032	file.exe	netsh.exe
PID 3500 wrote to memory of 3888	3500	lxfcivbz.exe	svchost.exe
PID 3500 wrote to memory of 3888	3500	lxfcivbz.exe	svchost.exe
PID 3500 wrote to memory of 3888	3500	lxfcivbz.exe	svchost.exe
PID 3500 wrote to memory of 3888	3500	lxfcivbz.exe	svchost.exe
PID 3500 wrote to memory of 3888	3500	lxfcivbz.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:5032

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bnsylhfz\
2⤵
PID:2120

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxfcivbz.exe" C:\Windows\SysWOW64\bnsylhfz\
2⤵
PID:4024

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create bnsylhfz binPath= "C:\Windows\SysWOW64\bnsylhfz\lxfcivbz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:224

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description bnsylhfz "wifi internet conection"
2⤵
- Launches sc.exe
PID:2612

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start bnsylhfz
2⤵
- Launches sc.exe
PID:1696

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:2900

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 5032 -s 1028
2⤵
- Program crash
PID:4436

C:\Windows\SysWOW64\bnsylhfz\lxfcivbz.exe
C:\Windows\SysWOW64\bnsylhfz\lxfcivbz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3500

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:3888

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3500 -s 516
2⤵
- Program crash
PID:2708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 5032 -ip 5032
1⤵
PID:2748

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 3500 -ip 3500
1⤵
PID:1480

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\lxfcivbz.exe
Filesize
14.8MB

MD5
be0a62e3152d95b6f9ffc89fe7d614bb

SHA1
e6a8899286ae77009d50ec9125c11716b8c0cb62

SHA256
6ce1c4611440fea167566e6012b67c8043da1c4832c31698becfd78d475161a1

SHA512
0e48acdf1e2d6c567266415d10c673c95b2d564b4440e7d80b0429fdfd92cf71b9979b4c7f66be86a70600632972e02e6153852433f7fd04a1ee623ab8e06be1

Download Submit
C:\Windows\SysWOW64\bnsylhfz\lxfcivbz.exe
Filesize
14.8MB

MD5
be0a62e3152d95b6f9ffc89fe7d614bb

SHA1
e6a8899286ae77009d50ec9125c11716b8c0cb62

SHA256
6ce1c4611440fea167566e6012b67c8043da1c4832c31698becfd78d475161a1

SHA512
0e48acdf1e2d6c567266415d10c673c95b2d564b4440e7d80b0429fdfd92cf71b9979b4c7f66be86a70600632972e02e6153852433f7fd04a1ee623ab8e06be1

Download Submit
memory/3500-146-0x0000000000400000-0x00000000006CE000-memory.dmp

Filesize
2.8MB

Download
memory/3888-141-0x0000000000380000-0x0000000000395000-memory.dmp

Filesize
84KB

Download
memory/3888-144-0x0000000000380000-0x0000000000395000-memory.dmp

Filesize
84KB

Download
memory/3888-145-0x0000000000380000-0x0000000000395000-memory.dmp

Filesize
84KB

Download
memory/3888-147-0x0000000000380000-0x0000000000395000-memory.dmp

Filesize
84KB

Download
memory/3888-149-0x0000000000380000-0x0000000000395000-memory.dmp

Filesize
84KB

Download
memory/5032-134-0x0000000000830000-0x0000000000843000-memory.dmp

Filesize
76KB

Download
memory/5032-138-0x0000000000400000-0x00000000006CE000-memory.dmp

Filesize
2.8MB

Download
memory/5032-139-0x0000000000830000-0x0000000000843000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads