tofsee | 628c1bfb9195b74c5a9846331f42886bc78aed36ac4049d010fe62fe4347f7ab

General

Target

18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe
Size

303KB
MD5

dd18a455e9d700d656ce6965cee1a068
SHA1

bb23d970e98a6a6ec178fc6c9c82689b3e92ee7c
SHA256

18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207
SHA512

71dc5ce080f2f95f2b68bcd135cfbbb9d020e10f58972b4f90ac98a3794f7791857139d45f417d127182bb26caca996a94c95008f2fc0ccc8a3c1b16dd07b531
SSDEEP

3072:duhpDHOnUv1WfCBuL4IdkVDJNhA+GHRIBiSp5z5DT4zknffhd+OH:shpDH9vEfQQrdkB7Fi05ykn3v+y

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

2116 netsh.exe

pid	process
2116	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\pzrozvwf\ImagePath = "C:\\Windows\\SysWOW64\\pzrozvwf\\lxnaonfj.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:

18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe

Executes dropped EXE 1 IoCs

Processes:

lxnaonfj.exe

pid process

2000 lxnaonfj.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:

lxnaonfj.exe

description pid process target process

PID 2000 set thread context of 3796 2000 lxnaonfj.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

2868 sc.exe
3672 sc.exe
756 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2000	lxnaonfj.exe

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

description	pid	process	target process
PID 2000 set thread context of 3796	2000	lxnaonfj.exe	svchost.exe

pid	process
2868	sc.exe
3672	sc.exe
756	sc.exe

Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid	pid_target	process	target process
3904	1912	WerFault.exe	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe
3976	2000	WerFault.exe	lxnaonfj.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:

18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exelxnaonfj.exe

description	pid	process	target process
PID 1912 wrote to memory of 324	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 324	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 324	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 3388	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 3388	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 3388	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	cmd.exe
PID 1912 wrote to memory of 2868	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 2868	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 2868	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 3672	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 3672	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 3672	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 756	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 756	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 756	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	sc.exe
PID 1912 wrote to memory of 2116	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	netsh.exe
PID 1912 wrote to memory of 2116	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	netsh.exe
PID 1912 wrote to memory of 2116	1912	18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe	netsh.exe
PID 2000 wrote to memory of 3796	2000	lxnaonfj.exe	svchost.exe
PID 2000 wrote to memory of 3796	2000	lxnaonfj.exe	svchost.exe
PID 2000 wrote to memory of 3796	2000	lxnaonfj.exe	svchost.exe
PID 2000 wrote to memory of 3796	2000	lxnaonfj.exe	svchost.exe
PID 2000 wrote to memory of 3796	2000	lxnaonfj.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe
"C:\Users\Admin\AppData\Local\Temp\18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1912

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pzrozvwf\
2⤵
PID:324

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxnaonfj.exe" C:\Windows\SysWOW64\pzrozvwf\
2⤵
PID:3388

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create pzrozvwf binPath= "C:\Windows\SysWOW64\pzrozvwf\lxnaonfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2868

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description pzrozvwf "wifi internet conection"
2⤵
- Launches sc.exe
PID:3672

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start pzrozvwf
2⤵
- Launches sc.exe
PID:756

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:2116

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1912 -s 1188
2⤵
- Program crash
PID:3904

C:\Windows\SysWOW64\pzrozvwf\lxnaonfj.exe
C:\Windows\SysWOW64\pzrozvwf\lxnaonfj.exe /d"C:\Users\Admin\AppData\Local\Temp\18643a9a6e4b61e967e428fadb2d4bb52dfed8a949b4a39cb461c2e3a8e6d207.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2000

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:3796

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2000 -s 528
2⤵
- Program crash
PID:3976

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 1912 -ip 1912
1⤵
PID:4896

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2000 -ip 2000
1⤵
PID:4252

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\lxnaonfj.exe
Filesize
11.9MB

MD5
a985b323a5251167e06831bbddf39165

SHA1
40327ab6e793e41c8c6090dd43bba30ccdc353b8

SHA256
6a1694f4b2da13734e2f5a959bee4740e1056a809d2e1668e1b471bacf227ffc

SHA512
9b9342113c7712e40ff4d4dc94e9127a7fdc0563edb6ede58a6b47b3d4d78ea3992b2567a5080138dc95209ddafeb574c73afeae3a6294a7502b9c7197b7d1d8

Download Submit
C:\Windows\SysWOW64\pzrozvwf\lxnaonfj.exe
Filesize
11.9MB

MD5
a985b323a5251167e06831bbddf39165

SHA1
40327ab6e793e41c8c6090dd43bba30ccdc353b8

SHA256
6a1694f4b2da13734e2f5a959bee4740e1056a809d2e1668e1b471bacf227ffc

SHA512
9b9342113c7712e40ff4d4dc94e9127a7fdc0563edb6ede58a6b47b3d4d78ea3992b2567a5080138dc95209ddafeb574c73afeae3a6294a7502b9c7197b7d1d8

Download Submit
memory/1912-135-0x0000000000CF0000-0x0000000000D03000-memory.dmp

Filesize
76KB

Download
memory/1912-139-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/2000-145-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/3796-140-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/3796-143-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/3796-144-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/3796-146-0x0000000000140000-0x0000000000155000-memory.dmp

Filesize
84KB

Download
memory/3796-147-0x0000000000140000-0x0000000000155000-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