tofsee | 8e7b46b880092192df1a09ea0fd5878b17d1ba9ae89c5de6d61d74d1dd3e35f6

General

Target

file.exe
Size

351KB
MD5

9f95df4831aaa8dc6bd0cd4584f59e9b
SHA1

14db8de87695de3074043932e8479e18ac2dd5d3
SHA256

8e7b46b880092192df1a09ea0fd5878b17d1ba9ae89c5de6d61d74d1dd3e35f6
SHA512

e2473f43d1898f6560935a4411de525ebdec2780d3c43132ebfec6adaa4e4de43b2af4ad4542ee1c3cd910a30718b79b04aa52143ea03c7b1edb78d495f71aee
SSDEEP

6144:r/eUB2wMyGWA1qom6IvMlU9kaXOOEbLQHl2QSzVhn25Y:r/hBVPGWA106bha+OKsRSL6Y

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

2264 netsh.exe

pid	process
2264	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\nxefsgqf\ImagePath = "C:\\Windows\\SysWOW64\\nxefsgqf\\ryxkssae.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-1-5-21-2548970870-3691742953-3895070203-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

ryxkssae.exe

pid process

716 ryxkssae.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:

ryxkssae.exe

description pid process target process

PID 716 set thread context of 1488 716 ryxkssae.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

4236 sc.exe
2008 sc.exe
3092 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

980 4872 WerFault.exe file.exe
4704 716 WerFault.exe ryxkssae.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2548970870-3691742953-3895070203-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
716	ryxkssae.exe

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

description	pid	process	target process
PID 716 set thread context of 1488	716	ryxkssae.exe	svchost.exe

pid	process
4236	sc.exe
2008	sc.exe
3092	sc.exe

pid	pid_target	process	target process
980	4872	WerFault.exe	file.exe
4704	716	WerFault.exe	ryxkssae.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 23 IoCs

Processes:

file.exeryxkssae.exe

description	pid	process	target process
PID 4872 wrote to memory of 2664	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 2664	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 2664	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 4520	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 4520	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 4520	4872	file.exe	cmd.exe
PID 4872 wrote to memory of 4236	4872	file.exe	sc.exe
PID 4872 wrote to memory of 4236	4872	file.exe	sc.exe
PID 4872 wrote to memory of 4236	4872	file.exe	sc.exe
PID 4872 wrote to memory of 2008	4872	file.exe	sc.exe
PID 4872 wrote to memory of 2008	4872	file.exe	sc.exe
PID 4872 wrote to memory of 2008	4872	file.exe	sc.exe
PID 4872 wrote to memory of 3092	4872	file.exe	sc.exe
PID 4872 wrote to memory of 3092	4872	file.exe	sc.exe
PID 4872 wrote to memory of 3092	4872	file.exe	sc.exe
PID 4872 wrote to memory of 2264	4872	file.exe	netsh.exe
PID 4872 wrote to memory of 2264	4872	file.exe	netsh.exe
PID 4872 wrote to memory of 2264	4872	file.exe	netsh.exe
PID 716 wrote to memory of 1488	716	ryxkssae.exe	svchost.exe
PID 716 wrote to memory of 1488	716	ryxkssae.exe	svchost.exe
PID 716 wrote to memory of 1488	716	ryxkssae.exe	svchost.exe
PID 716 wrote to memory of 1488	716	ryxkssae.exe	svchost.exe
PID 716 wrote to memory of 1488	716	ryxkssae.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:4872

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nxefsgqf\
2⤵
PID:2664

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ryxkssae.exe" C:\Windows\SysWOW64\nxefsgqf\
2⤵
PID:4520

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create nxefsgqf binPath= "C:\Windows\SysWOW64\nxefsgqf\ryxkssae.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4236

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description nxefsgqf "wifi internet conection"
2⤵
- Launches sc.exe
PID:2008

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start nxefsgqf
2⤵
- Launches sc.exe
PID:3092

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:2264

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4872 -s 592
2⤵
- Program crash
PID:980

C:\Windows\SysWOW64\nxefsgqf\ryxkssae.exe
C:\Windows\SysWOW64\nxefsgqf\ryxkssae.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:716

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:1488

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 716 -s 516
2⤵
- Program crash
PID:4704

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4872 -ip 4872
1⤵
PID:2104

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 716 -ip 716
1⤵
PID:3880

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\ryxkssae.exe
Filesize
12.6MB

MD5
53d2d24bca6ff43809e25c8257486792

SHA1
3b372e423f2d4b398d27c0ff21773c03acb72f4b

SHA256
b1c7ed56818b076eb0c288cca4cf40ef0cad894d06f97fd194400f9e98c9c494

SHA512
779a00e749a9b71f8452002318994d1f73a3c21c6d07d377f796893d250908455c9c63d302332d025867f4fa8db9f6f818827dc4d59e876a38d1f09df5980819

Download Submit
C:\Windows\SysWOW64\nxefsgqf\ryxkssae.exe
Filesize
12.6MB

MD5
53d2d24bca6ff43809e25c8257486792

SHA1
3b372e423f2d4b398d27c0ff21773c03acb72f4b

SHA256
b1c7ed56818b076eb0c288cca4cf40ef0cad894d06f97fd194400f9e98c9c494

SHA512
779a00e749a9b71f8452002318994d1f73a3c21c6d07d377f796893d250908455c9c63d302332d025867f4fa8db9f6f818827dc4d59e876a38d1f09df5980819

Download Submit
memory/716-144-0x0000000000400000-0x00000000007FC000-memory.dmp

Filesize
4.0MB

Download
memory/1488-140-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

Filesize
84KB

Download
memory/1488-143-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

Filesize
84KB

Download
memory/1488-145-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

Filesize
84KB

Download
memory/1488-146-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

Filesize
84KB

Download
memory/1488-147-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

Filesize
84KB

Download
memory/4872-135-0x00000000008C0000-0x00000000008D3000-memory.dmp

Filesize
76KB

Download
memory/4872-138-0x0000000000400000-0x00000000007FC000-memory.dmp

Filesize
4.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads