tofsee | 71864f13775192cf8a30f8a9318b224818f6edc52eda6db27b38e549fde0d413

General

Target

file.exe
Size

299KB
MD5

1f374aa76e90385b3697d554fb113906
SHA1

7c70071eee00e510fdeb851df9fe1bd6aafed42e
SHA256

71864f13775192cf8a30f8a9318b224818f6edc52eda6db27b38e549fde0d413
SHA512

bac66f3ddcaa964982ab2f108e4354408a22ed68a322df8ad547cd1d0da3d8120e076747147927be4c63132f289b3cef6be6fa1dc423da951bdc5ee580ce4255
SSDEEP

3072:Hfb6b8akULxbdRmbNPv2i3ClwyKy9gfACW4HluQjiMTE5HyNa5D:/zMLFyJRS4y0AC5FuQj9FNa

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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

4776 netsh.exe

pid	process
4776	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\hkgbdbbb\ImagePath = "C:\\Windows\\SysWOW64\\hkgbdbbb\\agtohobw.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-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation file.exe
Executes dropped EXE 1 IoCs

Processes:

agtohobw.exe

pid process

1936 agtohobw.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:

agtohobw.exe

description pid process target process

PID 1936 set thread context of 3276 1936 agtohobw.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

2168 sc.exe
3448 sc.exe
2612 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	file.exe

pid	process
1936	agtohobw.exe

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

description	pid	process	target process
PID 1936 set thread context of 3276	1936	agtohobw.exe	svchost.exe

pid	process
2168	sc.exe
3448	sc.exe
2612	sc.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.exeagtohobw.exe

description	pid	process	target process
PID 2240 wrote to memory of 3612	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 3612	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 3612	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 3064	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 3064	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 3064	2240	file.exe	cmd.exe
PID 2240 wrote to memory of 2168	2240	file.exe	sc.exe
PID 2240 wrote to memory of 2168	2240	file.exe	sc.exe
PID 2240 wrote to memory of 2168	2240	file.exe	sc.exe
PID 2240 wrote to memory of 3448	2240	file.exe	sc.exe
PID 2240 wrote to memory of 3448	2240	file.exe	sc.exe
PID 2240 wrote to memory of 3448	2240	file.exe	sc.exe
PID 2240 wrote to memory of 2612	2240	file.exe	sc.exe
PID 2240 wrote to memory of 2612	2240	file.exe	sc.exe
PID 2240 wrote to memory of 2612	2240	file.exe	sc.exe
PID 2240 wrote to memory of 4776	2240	file.exe	netsh.exe
PID 2240 wrote to memory of 4776	2240	file.exe	netsh.exe
PID 2240 wrote to memory of 4776	2240	file.exe	netsh.exe
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	svchost.exe
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	svchost.exe
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	svchost.exe
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	svchost.exe
PID 1936 wrote to memory of 3276	1936	agtohobw.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:2240

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hkgbdbbb\
2⤵
PID:3612

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\agtohobw.exe" C:\Windows\SysWOW64\hkgbdbbb\
2⤵
PID:3064

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create hkgbdbbb binPath= "C:\Windows\SysWOW64\hkgbdbbb\agtohobw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2168

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description hkgbdbbb "wifi internet conection"
2⤵
- Launches sc.exe
PID:3448

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start hkgbdbbb
2⤵
- Launches sc.exe
PID:2612

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:4776

C:\Windows\SysWOW64\hkgbdbbb\agtohobw.exe
C:\Windows\SysWOW64\hkgbdbbb\agtohobw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1936

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:3276

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\agtohobw.exe
Filesize
12.1MB

MD5
57279042bc6278a29518247e712adc70

SHA1
7a3e0b331c7fd92cfffc20885ddc037f8063b6b5

SHA256
8f83aac428f9f5ff4bcb86608d9847b41cab545395b9a87b351e1ce14308f31b

SHA512
d214a69618d2ee8c3b847394900adf1e5e927fcf50f2beacf1d8ac97513d6cdb841e99fa5e8b7a872ba9f3346a6f2ccd44a9c37da0d0318937dee97e392ce830

Download Submit
C:\Windows\SysWOW64\hkgbdbbb\agtohobw.exe
Filesize
12.1MB

MD5
57279042bc6278a29518247e712adc70

SHA1
7a3e0b331c7fd92cfffc20885ddc037f8063b6b5

SHA256
8f83aac428f9f5ff4bcb86608d9847b41cab545395b9a87b351e1ce14308f31b

SHA512
d214a69618d2ee8c3b847394900adf1e5e927fcf50f2beacf1d8ac97513d6cdb841e99fa5e8b7a872ba9f3346a6f2ccd44a9c37da0d0318937dee97e392ce830

Download Submit
memory/1936-148-0x0000000000789000-0x000000000079F000-memory.dmp

Filesize
88KB

Download
memory/1936-150-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2168-138-0x0000000000000000-mapping.dmp

Download
memory/2240-142-0x000000000087E000-0x0000000000894000-memory.dmp

Filesize
88KB

Download
memory/2240-133-0x000000000087E000-0x0000000000894000-memory.dmp

Filesize
88KB

Download
memory/2240-134-0x0000000002200000-0x0000000002213000-memory.dmp

Filesize
76KB

Download
memory/2240-135-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2240-143-0x0000000000400000-0x00000000004C7000-memory.dmp

Filesize
796KB

Download
memory/2612-140-0x0000000000000000-mapping.dmp

Download
memory/3064-136-0x0000000000000000-mapping.dmp

Download
memory/3276-145-0x0000000000000000-mapping.dmp

Download
memory/3276-146-0x0000000001210000-0x0000000001225000-memory.dmp

Filesize
84KB

Download
memory/3276-151-0x0000000001210000-0x0000000001225000-memory.dmp

Filesize
84KB

Download
memory/3276-152-0x0000000001210000-0x0000000001225000-memory.dmp

Filesize
84KB

Download
memory/3448-139-0x0000000000000000-mapping.dmp

Download
memory/3612-132-0x0000000000000000-mapping.dmp

Download
memory/4776-141-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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