tofsee | fbc03327661ed973c859257eb8ad4941108669c968de30a2ef77af775fe0e960

Analysis

max time kernel
150s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
25/03/2024, 15:47

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General

Target
de5f0b876145c3072389c0af52539a06.exe
Size 11.6MB
Sample240325-s76nvscb67
SHA256 fbc03327661ed973c859257eb8ad4941108669c968de30a2ef77af775fe0e960
MD5 de5f0b876145c3072389c0af52539a06
SHA1 8fcb3d87bdb58c8f5eb5cd5d439fb08c88e19c23
SHA512 858c78636b4c50791353b11df415e51bb8e3a2da4e2cda94ec2468a611db42ce30c3c3af3fa402825b2010eaad6f982088b293ddcc592726531933a4549092fc
SSDEEP 49152:L88888888888888888888888888888888888888888888888888888888888888T:
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

defeatwax.ru
refabyd.info

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

Windows Service
T1543.003

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3208	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\deroavu\ImagePath = "C:\\Windows\\SysWOW64\\deroavu\\jeorfqqy.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-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	de5f0b876145c3072389c0af52539a06.exe

Deletes itself 1 IoCs

pid	Process
3264	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4060	jeorfqqy.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4060 set thread context of 3264	4060	jeorfqqy.exe	114

Launches sc.exe 3 IoCs

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

pid	Process
2036	sc.exe
3432	sc.exe
4924	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

pid	pid_target	Process	procid_target
2024	1656	WerFault.exe	88
4316	4060	WerFault.exe	103

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 3148	1656	de5f0b876145c3072389c0af52539a06.exe	93
PID 1656 wrote to memory of 3148	1656	de5f0b876145c3072389c0af52539a06.exe	93
PID 1656 wrote to memory of 3148	1656	de5f0b876145c3072389c0af52539a06.exe	93
PID 1656 wrote to memory of 3424	1656	de5f0b876145c3072389c0af52539a06.exe	95
PID 1656 wrote to memory of 3424	1656	de5f0b876145c3072389c0af52539a06.exe	95
PID 1656 wrote to memory of 3424	1656	de5f0b876145c3072389c0af52539a06.exe	95
PID 1656 wrote to memory of 2036	1656	de5f0b876145c3072389c0af52539a06.exe	97
PID 1656 wrote to memory of 2036	1656	de5f0b876145c3072389c0af52539a06.exe	97
PID 1656 wrote to memory of 2036	1656	de5f0b876145c3072389c0af52539a06.exe	97
PID 1656 wrote to memory of 3432	1656	de5f0b876145c3072389c0af52539a06.exe	99
PID 1656 wrote to memory of 3432	1656	de5f0b876145c3072389c0af52539a06.exe	99
PID 1656 wrote to memory of 3432	1656	de5f0b876145c3072389c0af52539a06.exe	99
PID 1656 wrote to memory of 4924	1656	de5f0b876145c3072389c0af52539a06.exe	101
PID 1656 wrote to memory of 4924	1656	de5f0b876145c3072389c0af52539a06.exe	101
PID 1656 wrote to memory of 4924	1656	de5f0b876145c3072389c0af52539a06.exe	101
PID 1656 wrote to memory of 3208	1656	de5f0b876145c3072389c0af52539a06.exe	104
PID 1656 wrote to memory of 3208	1656	de5f0b876145c3072389c0af52539a06.exe	104
PID 1656 wrote to memory of 3208	1656	de5f0b876145c3072389c0af52539a06.exe	104
PID 4060 wrote to memory of 3264	4060	jeorfqqy.exe	114
PID 4060 wrote to memory of 3264	4060	jeorfqqy.exe	114
PID 4060 wrote to memory of 3264	4060	jeorfqqy.exe	114
PID 4060 wrote to memory of 3264	4060	jeorfqqy.exe	114
PID 4060 wrote to memory of 3264	4060	jeorfqqy.exe	114

C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe
"C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1656
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\deroavu\
  2⤵
  PID:3148
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jeorfqqy.exe" C:\Windows\SysWOW64\deroavu\
  2⤵
  PID:3424
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create deroavu binPath= "C:\Windows\SysWOW64\deroavu\jeorfqqy.exe /d\"C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2036
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description deroavu "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:3432
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start deroavu
  2⤵
  - Launches sc.exe
  PID:4924
- 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:3208
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1656 -s 1292
  2⤵
  - Program crash
  PID:2024

C:\Windows\SysWOW64\deroavu\jeorfqqy.exe
C:\Windows\SysWOW64\deroavu\jeorfqqy.exe /d"C:\Users\Admin\AppData\Local\Temp\de5f0b876145c3072389c0af52539a06.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4060
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3264
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4060 -s 544
  2⤵
  - Program crash
  PID:4316

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1656 -ip 1656
1⤵
PID:1900

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4060 -ip 4060
1⤵
PID:4724

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

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

jeorfqqy.exe

Path C:\Users\Admin\AppData\Local\Temp\jeorfqqy.exe
Size 8.1MB
SHA256 b42f8f1fa25b94dbf738ef1b63dea163af5c29c0cd4b9f791ee887eeced69344
MD5 ba0f71e13281a5ccc970321bffc92113
SHA1 8e1e294a319ae8073ced26632f18f8bc00fb5d51
SHA512 436d83a28668e9c692221994c706905af0bd4866c555f5fcb203681b0e0d0c872958544aacad76e650609ee10080c846a121185462ab301f51dfe39fe40b9737
SSDEEP 49152:B88888888888888888888888888888888888888888888888888888888888888w:+
MD5 SHA1 SHA512 SSDEEP

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jeorfqqy.exe

Path C:\Windows\SysWOW64\deroavu\jeorfqqy.exe
Size 4.2MB
SHA256 bd31765268b24c5717361c31462551cfab82a0e9d1ff400afdef5acee824263c
MD5 26160d8483a6609e372812a558198e0a
SHA1 0b5ebfdce274f72a8e6043b354d7dcae903aec21
SHA512 9fdcedc7a5b8c734a559e21ac43b91ed09ceb93a28b39ce6f6ecc22f124d921103510dc0b0a8e573aeb45f834c73f645d239a94e34dcccb08f1488a7d19ac434
SSDEEP 49152:B88888888888888888888888888888888888888888888888888888888888888B:3
MD5 SHA1 SHA512 SSDEEP

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memory/1656-8-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/1656-4-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/1656-2-0x00000000049B0000-0x00000000049C3000-memory.dmp

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memory/1656-9-0x00000000049B0000-0x00000000049C3000-memory.dmp

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memory/1656-1-0x0000000002D90000-0x0000000002E90000-memory.dmp

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memory/3264-11-0x0000000000510000-0x0000000000525000-memory.dmp

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memory/3264-16-0x0000000000510000-0x0000000000525000-memory.dmp

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memory/3264-17-0x0000000000510000-0x0000000000525000-memory.dmp

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memory/3264-19-0x0000000000510000-0x0000000000525000-memory.dmp

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memory/4060-10-0x0000000002F00000-0x0000000003000000-memory.dmp

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memory/4060-14-0x0000000000400000-0x0000000002C68000-memory.dmp

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memory/4060-18-0x0000000000400000-0x0000000002C68000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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