tofsee | 25ed67b390cafbd1ebcebed4c9cad13c38e6998c45e501e23d6652ac04bb69ef

General

Target

097bc3c7d6f6f50a503fdb7a56e22a34.exe
Size

312KB
MD5

097bc3c7d6f6f50a503fdb7a56e22a34
SHA1

bc801204c76b73ee9e66a9a7bdffd856965604e0
SHA256

25ed67b390cafbd1ebcebed4c9cad13c38e6998c45e501e23d6652ac04bb69ef
SHA512

7dedbefbe0a0af1d1541374a1a8916eb45d6037c15b8ae36ed28c4dfc0a9d22f5062b584b856b8d32cf5d675f1a718b31b029dc5abcea4c40d8925ae42f05eea
SSDEEP

3072:6AX8ODio3+FCLQbFK+OCQ/KbqAjxBn7UJIdg6hO3Vd+eVRg/5wcw3P3XqT:vPDl5L0FKBDKbzBYd6upvG

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

3004 netsh.exe

pid	process
3004	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\scgnhtaq\ImagePath = "C:\\Windows\\SysWOW64\\scgnhtaq\\ynfmrpum.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:

097bc3c7d6f6f50a503fdb7a56e22a34.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	097bc3c7d6f6f50a503fdb7a56e22a34.exe

Executes dropped EXE 1 IoCs

Processes:

ynfmrpum.exe

pid process

4084 ynfmrpum.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:

ynfmrpum.exe

description pid process target process

PID 4084 set thread context of 4460 4084 ynfmrpum.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

3916 sc.exe
3280 sc.exe
32 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

4640 4720 WerFault.exe 097bc3c7d6f6f50a503fdb7a56e22a34.exe
1784 4084 WerFault.exe ynfmrpum.exe

pid	process
4084	ynfmrpum.exe

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

description	pid	process	target process
PID 4084 set thread context of 4460	4084	ynfmrpum.exe	svchost.exe

pid	process
3916	sc.exe
3280	sc.exe
32	sc.exe

pid	pid_target	process	target process
4640	4720	WerFault.exe	097bc3c7d6f6f50a503fdb7a56e22a34.exe
1784	4084	WerFault.exe	ynfmrpum.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:

097bc3c7d6f6f50a503fdb7a56e22a34.exeynfmrpum.exe

description	pid	process	target process
PID 4720 wrote to memory of 3252	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 3252	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 3252	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 1332	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 1332	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 1332	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	cmd.exe
PID 4720 wrote to memory of 3916	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3916	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3916	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3280	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3280	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3280	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 32	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 32	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 32	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	sc.exe
PID 4720 wrote to memory of 3004	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 4720 wrote to memory of 3004	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 4720 wrote to memory of 3004	4720	097bc3c7d6f6f50a503fdb7a56e22a34.exe	netsh.exe
PID 4084 wrote to memory of 4460	4084	ynfmrpum.exe	svchost.exe
PID 4084 wrote to memory of 4460	4084	ynfmrpum.exe	svchost.exe
PID 4084 wrote to memory of 4460	4084	ynfmrpum.exe	svchost.exe
PID 4084 wrote to memory of 4460	4084	ynfmrpum.exe	svchost.exe
PID 4084 wrote to memory of 4460	4084	ynfmrpum.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe
"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4720

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\scgnhtaq\
2⤵
PID:3252

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ynfmrpum.exe" C:\Windows\SysWOW64\scgnhtaq\
2⤵
PID:1332

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create scgnhtaq binPath= "C:\Windows\SysWOW64\scgnhtaq\ynfmrpum.exe /d\"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3916

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description scgnhtaq "wifi internet conection"
2⤵
- Launches sc.exe
PID:3280

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start scgnhtaq
2⤵
- Launches sc.exe
PID:32

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:3004

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4720 -s 896
2⤵
- Program crash
PID:4640

C:\Windows\SysWOW64\scgnhtaq\ynfmrpum.exe
C:\Windows\SysWOW64\scgnhtaq\ynfmrpum.exe /d"C:\Users\Admin\AppData\Local\Temp\097bc3c7d6f6f50a503fdb7a56e22a34.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4084

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:4460

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4084 -s 516
2⤵
- Program crash
PID:1784

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4720 -ip 4720
1⤵
PID:4964

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 4084 -ip 4084
1⤵
PID:1504

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\ynfmrpum.exe
Filesize
11.0MB

MD5
d83489e7fa58b0df680f3acd3030f73d

SHA1
9683d47ebd026892b673f576bb41928ab606ddb3

SHA256
97d9acc3df0812ba62af428890f163cd70ead4325c5f63df5e597af5defa288f

SHA512
1214434a2ef0ba6ae71f7a2b56c5b9cfeba0d21c79af50e45f636a64fbbf935b008e47c5d18688f7e434da709a7ed98666f09cc2e268a5cdff14615821efcb74

Download Submit
C:\Windows\SysWOW64\scgnhtaq\ynfmrpum.exe
Filesize
11.0MB

MD5
d83489e7fa58b0df680f3acd3030f73d

SHA1
9683d47ebd026892b673f576bb41928ab606ddb3

SHA256
97d9acc3df0812ba62af428890f163cd70ead4325c5f63df5e597af5defa288f

SHA512
1214434a2ef0ba6ae71f7a2b56c5b9cfeba0d21c79af50e45f636a64fbbf935b008e47c5d18688f7e434da709a7ed98666f09cc2e268a5cdff14615821efcb74

Download Submit
memory/4084-146-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/4460-142-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4460-145-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4460-147-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4460-148-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4460-149-0x0000000001250000-0x0000000001265000-memory.dmp

Filesize
84KB

Download
memory/4720-134-0x0000000000870000-0x0000000000883000-memory.dmp

Filesize
76KB

Download
memory/4720-138-0x0000000000400000-0x00000000006E9000-memory.dmp

Filesize
2.9MB

Download
memory/4720-141-0x0000000000870000-0x0000000000883000-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