tofsee | 5fb8fee2684b282fcaa3cef7f60ef934421f8f4e5c11ef08f3623df7d8e40669

Analysis

max time kernel
150s
max time network
166s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
31/12/2023, 06:20

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General

Target

2b84aab8b60102d44067f70578860110.exe
Size

11.8MB
MD5

2b84aab8b60102d44067f70578860110
SHA1

e09992036f447a9067081facbc955cc0cd8993d9
SHA256

5fb8fee2684b282fcaa3cef7f60ef934421f8f4e5c11ef08f3623df7d8e40669
SHA512

5c75c1b23fa5e87427f036a2cb885ba8423376236a08c1a5e3d5aad007a515a8bd42d8854de9eb13724b09b566ab865b865663613eeb0a3d5a4297d18c9acf6e
SSDEEP

24576:ElxdvCcpOKCtBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBl:ElzOR

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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\fcdbdnra = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
2748	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\fcdbdnra\ImagePath = "C:\\Windows\\SysWOW64\\fcdbdnra\\veqwgbxn.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2696	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2716	veqwgbxn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2716 set thread context of 2696	2716	veqwgbxn.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2788	sc.exe
2060	sc.exe
2808	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2540 wrote to memory of 2760	2540	2b84aab8b60102d44067f70578860110.exe	29
PID 2540 wrote to memory of 2760	2540	2b84aab8b60102d44067f70578860110.exe	29
PID 2540 wrote to memory of 2760	2540	2b84aab8b60102d44067f70578860110.exe	29
PID 2540 wrote to memory of 2760	2540	2b84aab8b60102d44067f70578860110.exe	29
PID 2540 wrote to memory of 2720	2540	2b84aab8b60102d44067f70578860110.exe	30
PID 2540 wrote to memory of 2720	2540	2b84aab8b60102d44067f70578860110.exe	30
PID 2540 wrote to memory of 2720	2540	2b84aab8b60102d44067f70578860110.exe	30
PID 2540 wrote to memory of 2720	2540	2b84aab8b60102d44067f70578860110.exe	30
PID 2540 wrote to memory of 2788	2540	2b84aab8b60102d44067f70578860110.exe	32
PID 2540 wrote to memory of 2788	2540	2b84aab8b60102d44067f70578860110.exe	32
PID 2540 wrote to memory of 2788	2540	2b84aab8b60102d44067f70578860110.exe	32
PID 2540 wrote to memory of 2788	2540	2b84aab8b60102d44067f70578860110.exe	32
PID 2540 wrote to memory of 2060	2540	2b84aab8b60102d44067f70578860110.exe	34
PID 2540 wrote to memory of 2060	2540	2b84aab8b60102d44067f70578860110.exe	34
PID 2540 wrote to memory of 2060	2540	2b84aab8b60102d44067f70578860110.exe	34
PID 2540 wrote to memory of 2060	2540	2b84aab8b60102d44067f70578860110.exe	34
PID 2540 wrote to memory of 2808	2540	2b84aab8b60102d44067f70578860110.exe	37
PID 2540 wrote to memory of 2808	2540	2b84aab8b60102d44067f70578860110.exe	37
PID 2540 wrote to memory of 2808	2540	2b84aab8b60102d44067f70578860110.exe	37
PID 2540 wrote to memory of 2808	2540	2b84aab8b60102d44067f70578860110.exe	37
PID 2540 wrote to memory of 2748	2540	2b84aab8b60102d44067f70578860110.exe	39
PID 2540 wrote to memory of 2748	2540	2b84aab8b60102d44067f70578860110.exe	39
PID 2540 wrote to memory of 2748	2540	2b84aab8b60102d44067f70578860110.exe	39
PID 2540 wrote to memory of 2748	2540	2b84aab8b60102d44067f70578860110.exe	39
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41
PID 2716 wrote to memory of 2696	2716	veqwgbxn.exe	41

C:\Users\Admin\AppData\Local\Temp\2b84aab8b60102d44067f70578860110.exe
"C:\Users\Admin\AppData\Local\Temp\2b84aab8b60102d44067f70578860110.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2540
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fcdbdnra\
  2⤵
  PID:2760
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\veqwgbxn.exe" C:\Windows\SysWOW64\fcdbdnra\
  2⤵
  PID:2720
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create fcdbdnra binPath= "C:\Windows\SysWOW64\fcdbdnra\veqwgbxn.exe /d\"C:\Users\Admin\AppData\Local\Temp\2b84aab8b60102d44067f70578860110.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2788
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description fcdbdnra "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2060
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start fcdbdnra
  2⤵
  - Launches sc.exe
  PID:2808
- 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:2748

C:\Windows\SysWOW64\fcdbdnra\veqwgbxn.exe
C:\Windows\SysWOW64\fcdbdnra\veqwgbxn.exe /d"C:\Users\Admin\AppData\Local\Temp\2b84aab8b60102d44067f70578860110.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2716
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2696

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 Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\veqwgbxn.exe

Filesize
5.1MB

MD5
e692fd8312efb0f63a17f8656846e7cf

SHA1
dffcd127e43539fbf5e37e33825a26a00f5b9268

SHA256
6e03013ca9d7f68c72411ae5a153eac293405895834ebfb0946e70d7a747d4a0

SHA512
7fcad00ff28a5a75483ee6d0197afc70a6ccfc7c7319bdff946b6f0df7b8431b9443ddd6249886ed032c01134c5245b689b841232e975f0cef7e60fea8fa1caa

Download Submit
C:\Windows\SysWOW64\fcdbdnra\veqwgbxn.exe

Filesize
184KB

MD5
ebf21a433e4b2468975910a3ab0c5c05

SHA1
11cbdc07b00d9b08e9e0d92a62809b575b827186

SHA256
4cefef8ee1edea5549ffff397b0e76c7dbf2320148f3b697cce27c77c79a2dba

SHA512
e41ee4e445524faef197390735e869064fa683e768952613bae726dcb2b2e4a5720ef719be01010e4ecb6fb8033e464349b1da7387ecc14d42d12c80ca65a5ce

Download Submit
memory/2540-3-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2540-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2540-7-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2540-9-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2540-1-0x0000000000520000-0x0000000000620000-memory.dmp

Filesize
1024KB

Download
memory/2696-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2696-22-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2696-15-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2696-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2696-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2696-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2696-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2716-17-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2716-11-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2716-10-0x00000000005F0000-0x00000000006F0000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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