tofsee | 71864f13775192cf8a30f8a9318b224818f6edc52eda6db27b38e549fde0d413

Analysis

max time kernel
143s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
07/02/2023, 00:37

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General

Target
file.exe
Size 299KB
Sample230207-aygz2agf74
SHA256 71864f13775192cf8a30f8a9318b224818f6edc52eda6db27b38e549fde0d413
MD5 1f374aa76e90385b3697d554fb113906
SHA1 7c70071eee00e510fdeb851df9fe1bd6aafed42e
SHA512 bac66f3ddcaa964982ab2f108e4354408a22ed68a322df8ad547cd1d0da3d8120e076747147927be4c63132f289b3cef6be6fa1dc423da951bdc5ee580ce4255
SSDEEP 3072:Hfb6b8akULxbdRmbNPv2i3ClwyKy9gfACW4HluQjiMTE5HyNa5D:/zMLFyJRS4y0AC5FuQj9FNa
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

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

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

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

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

pid	Process
1936	agtohobw.exe

Drops file in System32 directory 1 IoCs

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

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1936 set thread context of 3276	1936	agtohobw.exe	95

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

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

Modifies data under HKEY_USERS 2 IoCs

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

description	pid	Process	procid_target
PID 2240 wrote to memory of 3612	2240	file.exe	82
PID 2240 wrote to memory of 3612	2240	file.exe	82
PID 2240 wrote to memory of 3612	2240	file.exe	82
PID 2240 wrote to memory of 3064	2240	file.exe	84
PID 2240 wrote to memory of 3064	2240	file.exe	84
PID 2240 wrote to memory of 3064	2240	file.exe	84
PID 2240 wrote to memory of 2168	2240	file.exe	86
PID 2240 wrote to memory of 2168	2240	file.exe	86
PID 2240 wrote to memory of 2168	2240	file.exe	86
PID 2240 wrote to memory of 3448	2240	file.exe	88
PID 2240 wrote to memory of 3448	2240	file.exe	88
PID 2240 wrote to memory of 3448	2240	file.exe	88
PID 2240 wrote to memory of 2612	2240	file.exe	90
PID 2240 wrote to memory of 2612	2240	file.exe	90
PID 2240 wrote to memory of 2612	2240	file.exe	90
PID 2240 wrote to memory of 4776	2240	file.exe	92
PID 2240 wrote to memory of 4776	2240	file.exe	92
PID 2240 wrote to memory of 4776	2240	file.exe	92
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	95
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	95
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	95
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	95
PID 1936 wrote to memory of 3276	1936	agtohobw.exe	95

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

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

agtohobw.exe

Path C:\Users\Admin\AppData\Local\Temp\agtohobw.exe
Size 12.1MB
SHA256 8f83aac428f9f5ff4bcb86608d9847b41cab545395b9a87b351e1ce14308f31b
MD5 57279042bc6278a29518247e712adc70
SHA1 7a3e0b331c7fd92cfffc20885ddc037f8063b6b5
SHA512 d214a69618d2ee8c3b847394900adf1e5e927fcf50f2beacf1d8ac97513d6cdb841e99fa5e8b7a872ba9f3346a6f2ccd44a9c37da0d0318937dee97e392ce830
SSDEEP 3072:hfb6b8akULxbdRmbNPv2i3ClwyKy9gfACW4HluQjiMTE5HyNa5Doooooooooooo:lzMLFyJRS4y0AC5FuQj9FNa
MD5 SHA1 SHA512 SSDEEP

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agtohobw.exe

Path C:\Windows\SysWOW64\hkgbdbbb\agtohobw.exe
Size 12.1MB
SHA256 8f83aac428f9f5ff4bcb86608d9847b41cab545395b9a87b351e1ce14308f31b
MD5 57279042bc6278a29518247e712adc70
SHA1 7a3e0b331c7fd92cfffc20885ddc037f8063b6b5
SHA512 d214a69618d2ee8c3b847394900adf1e5e927fcf50f2beacf1d8ac97513d6cdb841e99fa5e8b7a872ba9f3346a6f2ccd44a9c37da0d0318937dee97e392ce830
SSDEEP 3072:hfb6b8akULxbdRmbNPv2i3ClwyKy9gfACW4HluQjiMTE5HyNa5Doooooooooooo:lzMLFyJRS4y0AC5FuQj9FNa
MD5 SHA1 SHA512 SSDEEP

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

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

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

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

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

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

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

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

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

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

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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