tofsee | f1b14007a26d653067be8c62a58f74b016510a9319f397af6bc25563af031134

General

Target

file.exe
Size

327KB
MD5

f4e4532af8047a15ae7040a12801d18d
SHA1

3931db953fc1a08dd436bbba3d07f00c9010c0f5
SHA256

f1b14007a26d653067be8c62a58f74b016510a9319f397af6bc25563af031134
SHA512

84927da999e23bf8bd35629d2f028bdcf3db7d866369d67d8e8c142ba937b8eccb22bc5f959dcc31d43153fc843344b8966967d3bb6df78221f0c42a16a3d687
SSDEEP

3072:pl9KGMGYbcp6z/CO0HL4LPvwo4DX6r4e4hXodaGhrOdf2L/5yX0eIGl1qoMfpT:QGTuXzELOXwo4a4eCodaGV405UoX

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

4952 netsh.exe

pid	process
4952	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\ldvwxoza\ImagePath = "C:\\Windows\\SysWOW64\\ldvwxoza\\zgfsaaim.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-1-5-21-2805025096-2326403612-4231045514-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

zgfsaaim.exe

pid process

224 zgfsaaim.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:

zgfsaaim.exe

description pid process target process

PID 224 set thread context of 4512 224 zgfsaaim.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

2296 sc.exe
3040 sc.exe
4452 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

4752 2744 WerFault.exe file.exe
1788 224 WerFault.exe zgfsaaim.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2805025096-2326403612-4231045514-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
224	zgfsaaim.exe

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

description	pid	process	target process
PID 224 set thread context of 4512	224	zgfsaaim.exe	svchost.exe

pid	process
2296	sc.exe
3040	sc.exe
4452	sc.exe

pid	pid_target	process	target process
4752	2744	WerFault.exe	file.exe
1788	224	WerFault.exe	zgfsaaim.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.exezgfsaaim.exe

description	pid	process	target process
PID 2744 wrote to memory of 1296	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 1296	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 1296	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 3092	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 3092	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 3092	2744	file.exe	cmd.exe
PID 2744 wrote to memory of 2296	2744	file.exe	sc.exe
PID 2744 wrote to memory of 2296	2744	file.exe	sc.exe
PID 2744 wrote to memory of 2296	2744	file.exe	sc.exe
PID 2744 wrote to memory of 3040	2744	file.exe	sc.exe
PID 2744 wrote to memory of 3040	2744	file.exe	sc.exe
PID 2744 wrote to memory of 3040	2744	file.exe	sc.exe
PID 2744 wrote to memory of 4452	2744	file.exe	sc.exe
PID 2744 wrote to memory of 4452	2744	file.exe	sc.exe
PID 2744 wrote to memory of 4452	2744	file.exe	sc.exe
PID 2744 wrote to memory of 4952	2744	file.exe	netsh.exe
PID 2744 wrote to memory of 4952	2744	file.exe	netsh.exe
PID 2744 wrote to memory of 4952	2744	file.exe	netsh.exe
PID 224 wrote to memory of 4512	224	zgfsaaim.exe	svchost.exe
PID 224 wrote to memory of 4512	224	zgfsaaim.exe	svchost.exe
PID 224 wrote to memory of 4512	224	zgfsaaim.exe	svchost.exe
PID 224 wrote to memory of 4512	224	zgfsaaim.exe	svchost.exe
PID 224 wrote to memory of 4512	224	zgfsaaim.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:2744

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ldvwxoza\
2⤵
PID:1296

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zgfsaaim.exe" C:\Windows\SysWOW64\ldvwxoza\
2⤵
PID:3092

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ldvwxoza binPath= "C:\Windows\SysWOW64\ldvwxoza\zgfsaaim.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2296

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ldvwxoza "wifi internet conection"
2⤵
- Launches sc.exe
PID:3040

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ldvwxoza
2⤵
- Launches sc.exe
PID:4452

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:4952

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2744 -s 1036
2⤵
- Program crash
PID:4752

C:\Windows\SysWOW64\ldvwxoza\zgfsaaim.exe
C:\Windows\SysWOW64\ldvwxoza\zgfsaaim.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:224

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:4512

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 224 -s 512
2⤵
- Program crash
PID:1788

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2744 -ip 2744
1⤵
PID:1948

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 224 -ip 224
1⤵
PID:3984

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\zgfsaaim.exe
Filesize
10.9MB

MD5
3ba48d039f13f7cb673b6db3609381a0

SHA1
44cbfc28be3e6305270424776a3162e495a21d1e

SHA256
a9d0ba6447ed0373575e44d3bc51ddb4680d2fb2408b08dfb2fbee9b44ea6318

SHA512
d39fee6419af2cc002cb40e4cb40f6569c1f6d442d2eaebf3e135deb43ff0225a7eead819dd1a4562a044670acd01fea351f9bb9253e9be18a08f1eeca94be88

Download Submit
C:\Windows\SysWOW64\ldvwxoza\zgfsaaim.exe
Filesize
10.9MB

MD5
3ba48d039f13f7cb673b6db3609381a0

SHA1
44cbfc28be3e6305270424776a3162e495a21d1e

SHA256
a9d0ba6447ed0373575e44d3bc51ddb4680d2fb2408b08dfb2fbee9b44ea6318

SHA512
d39fee6419af2cc002cb40e4cb40f6569c1f6d442d2eaebf3e135deb43ff0225a7eead819dd1a4562a044670acd01fea351f9bb9253e9be18a08f1eeca94be88

Download Submit
memory/224-144-0x0000000000400000-0x00000000006D0000-memory.dmp

Filesize
2.8MB

Download
memory/2744-135-0x0000000000820000-0x0000000000833000-memory.dmp

Filesize
76KB

Download
memory/2744-138-0x0000000000400000-0x00000000006D0000-memory.dmp

Filesize
2.8MB

Download
memory/4512-140-0x00000000003D0000-0x00000000003E5000-memory.dmp

Filesize
84KB

Download
memory/4512-143-0x00000000003D0000-0x00000000003E5000-memory.dmp

Filesize
84KB

Download
memory/4512-145-0x00000000003D0000-0x00000000003E5000-memory.dmp

Filesize
84KB

Download
memory/4512-146-0x00000000003D0000-0x00000000003E5000-memory.dmp

Filesize
84KB

Download
memory/4512-148-0x00000000003D0000-0x00000000003E5000-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