tofsee | 65757b57e365632cbb09a09c18fe86a67aa5d53c8fd9da23ee7842d8a46055a8

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
24/10/2022, 08:39

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General

Target
file.exe
Size 230KB
Sample221024-kkac5sffgn
SHA256 65757b57e365632cbb09a09c18fe86a67aa5d53c8fd9da23ee7842d8a46055a8
MD5 988e00b9de7bc68ba25bd87abfc5ee1e
SHA1 9e8d0636f82a04cb3be147fcd4cbb2b135e7ffe1
SHA512 dd34e8e544f985505b8b047f453759e368a831ebf25cf07008d8466de174153287c3bc2ae3f6a2a3b2f8c1610176f33c71359c1f22fba3e945703cc05afde259
SSDEEP 6144:v73P/9LU1sRQa338j2WKpmWj7GwWtseqTj:v7fVoEQa33fWCLWwWtW3
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

Executes dropped EXE 1 IoCs

pid	Process
4528	ubbfgqal.exe

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
4320	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\wlatdvfu\ImagePath = "C:\\Windows\\SysWOW64\\wlatdvfu\\ubbfgqal.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	file.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 4528 set thread context of 1428	4528	ubbfgqal.exe	103

Launches sc.exe 3 IoCs

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

pid	Process
4400	sc.exe
2124	sc.exe
3532	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
1348	1836	WerFault.exe	83
1708	4528	WerFault.exe	98

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 1836 wrote to memory of 3988	1836	file.exe	85
PID 1836 wrote to memory of 3988	1836	file.exe	85
PID 1836 wrote to memory of 3988	1836	file.exe	85
PID 1836 wrote to memory of 4776	1836	file.exe	89
PID 1836 wrote to memory of 4776	1836	file.exe	89
PID 1836 wrote to memory of 4776	1836	file.exe	89
PID 1836 wrote to memory of 4400	1836	file.exe	91
PID 1836 wrote to memory of 4400	1836	file.exe	91
PID 1836 wrote to memory of 4400	1836	file.exe	91
PID 1836 wrote to memory of 2124	1836	file.exe	94
PID 1836 wrote to memory of 2124	1836	file.exe	94
PID 1836 wrote to memory of 2124	1836	file.exe	94
PID 1836 wrote to memory of 3532	1836	file.exe	96
PID 1836 wrote to memory of 3532	1836	file.exe	96
PID 1836 wrote to memory of 3532	1836	file.exe	96
PID 1836 wrote to memory of 4320	1836	file.exe	99
PID 1836 wrote to memory of 4320	1836	file.exe	99
PID 1836 wrote to memory of 4320	1836	file.exe	99
PID 4528 wrote to memory of 1428	4528	ubbfgqal.exe	103
PID 4528 wrote to memory of 1428	4528	ubbfgqal.exe	103
PID 4528 wrote to memory of 1428	4528	ubbfgqal.exe	103
PID 4528 wrote to memory of 1428	4528	ubbfgqal.exe	103
PID 4528 wrote to memory of 1428	4528	ubbfgqal.exe	103

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:1836
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wlatdvfu\
  2⤵
  PID:3988
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ubbfgqal.exe" C:\Windows\SysWOW64\wlatdvfu\
  2⤵
  PID:4776
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create wlatdvfu binPath= "C:\Windows\SysWOW64\wlatdvfu\ubbfgqal.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4400
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description wlatdvfu "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2124
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start wlatdvfu
  2⤵
  - Launches sc.exe
  PID:3532
- 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:4320
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1836 -s 1216
  2⤵
  - Program crash
  PID:1348

C:\Windows\SysWOW64\wlatdvfu\ubbfgqal.exe
C:\Windows\SysWOW64\wlatdvfu\ubbfgqal.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4528
- 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:1428
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4528 -s 556
  2⤵
  - Program crash
  PID:1708

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1836 -ip 1836
1⤵
PID:3696

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 552 -p 4528 -ip 4528
1⤵
PID:1972

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

ubbfgqal.exe

Path C:\Users\Admin\AppData\Local\Temp\ubbfgqal.exe
Size 10.1MB
SHA256 c8f8515cbb586ad38d1b94e2b16aa400dba18137fc926da6d1b6d7de9e129145
MD5 eccd6a7054d8f83206135b8835491f3e
SHA1 7921ae5bc5092d75b323294102759e7e48dc9b99
SHA512 51e3562489e689cfd2b4f9f9c9dbf966b818399c7e62f17accdbe9d180b78fc01e4fd955ae500c5d1251725996293ee7b30f653c45a7b08ebbd82bb1266e1003
SSDEEP 12288:07fVoEQa33fWCLWwWtW31111111111111111111111111111111111111111111P:0DSanf7i
MD5 SHA1 SHA512 SSDEEP

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ubbfgqal.exe

Path C:\Windows\SysWOW64\wlatdvfu\ubbfgqal.exe
Size 10.1MB
SHA256 c8f8515cbb586ad38d1b94e2b16aa400dba18137fc926da6d1b6d7de9e129145
MD5 eccd6a7054d8f83206135b8835491f3e
SHA1 7921ae5bc5092d75b323294102759e7e48dc9b99
SHA512 51e3562489e689cfd2b4f9f9c9dbf966b818399c7e62f17accdbe9d180b78fc01e4fd955ae500c5d1251725996293ee7b30f653c45a7b08ebbd82bb1266e1003
SSDEEP 12288:07fVoEQa33fWCLWwWtW31111111111111111111111111111111111111111111P:0DSanf7i
MD5 SHA1 SHA512 SSDEEP

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memory/1428-152-0x0000000000F00000-0x0000000000F15000-memory.dmp

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memory/1428-151-0x0000000000F00000-0x0000000000F15000-memory.dmp

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memory/1428-146-0x0000000000F00000-0x0000000000F15000-memory.dmp

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memory/1836-144-0x0000000000400000-0x0000000000597000-memory.dmp

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memory/1836-133-0x00000000006F0000-0x0000000000703000-memory.dmp

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memory/1836-134-0x0000000000400000-0x0000000000597000-memory.dmp

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memory/1836-132-0x00000000007C3000-0x00000000007D4000-memory.dmp

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memory/1836-143-0x00000000007C3000-0x00000000007D4000-memory.dmp

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memory/4528-149-0x000000000096E000-0x000000000097F000-memory.dmp

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memory/4528-150-0x0000000000400000-0x0000000000597000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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