tofsee | 7cfc0cb1634d36afcbb33d202d956c030d5d0cc15113eb7c64d3429c50fb1a22

Analysis

max time kernel
143s
max time network
144s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
14/04/2023, 20:49

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General

Target

77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe
Size

276KB
MD5

80ee506064ae22c8ea34ffb2431f2488
SHA1

0c5a71beb97751a781203d598e97e5a746df62df
SHA256

77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb
SHA512

39be470cc5e8f170296371c7cfb7727b402e4c8b6e1ea6d66fe4195aa83f090cb9cf17d941dbb15214ae9e0a20f0015a190eb35a563067f2d645ea3f21609a6c
SSDEEP

3072:/3czQeDsw9vCdirSqJ4GGueYDDwOtDUeblv8zMrnwg5o6JP3WJ0nWFok:GQmstdiDJ4xuHDwiDpd8z+w56J+Dak

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

vanaheim.cn

jotunheim.name

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

Disabling Security Tools

T1089

Modify Registry

T1112

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

Creates new service(s) 1 TTPs
persistence

New Service
T1050

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Modify Existing Service

T1031

pid	Process
1488	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\mnpdcisa\ImagePath = "C:\\Windows\\SysWOW64\\mnpdcisa\\vcfazttn.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
1904	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2016	vcfazttn.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 2016 set thread context of 1904	2016	vcfazttn.exe	39

Launches sc.exe 3 IoCs

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

pid	Process
320	sc.exe
700	sc.exe
664	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 30 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 1708	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	28
PID 1056 wrote to memory of 1708	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	28
PID 1056 wrote to memory of 1708	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	28
PID 1056 wrote to memory of 1708	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	28
PID 1056 wrote to memory of 864	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	30
PID 1056 wrote to memory of 864	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	30
PID 1056 wrote to memory of 864	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	30
PID 1056 wrote to memory of 864	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	30
PID 1056 wrote to memory of 664	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	32
PID 1056 wrote to memory of 664	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	32
PID 1056 wrote to memory of 664	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	32
PID 1056 wrote to memory of 664	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	32
PID 1056 wrote to memory of 320	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	34
PID 1056 wrote to memory of 320	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	34
PID 1056 wrote to memory of 320	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	34
PID 1056 wrote to memory of 320	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	34
PID 1056 wrote to memory of 700	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	36
PID 1056 wrote to memory of 700	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	36
PID 1056 wrote to memory of 700	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	36
PID 1056 wrote to memory of 700	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	36
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 2016 wrote to memory of 1904	2016	vcfazttn.exe	39
PID 1056 wrote to memory of 1488	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	40
PID 1056 wrote to memory of 1488	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	40
PID 1056 wrote to memory of 1488	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	40
PID 1056 wrote to memory of 1488	1056	77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe	40

C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe
"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1056
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mnpdcisa\
  2⤵
  PID:1708
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vcfazttn.exe" C:\Windows\SysWOW64\mnpdcisa\
  2⤵
  PID:864
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create mnpdcisa binPath= "C:\Windows\SysWOW64\mnpdcisa\vcfazttn.exe /d\"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:664
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description mnpdcisa "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:320
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start mnpdcisa
  2⤵
  - Launches sc.exe
  PID:700
- 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:1488

C:\Windows\SysWOW64\mnpdcisa\vcfazttn.exe
C:\Windows\SysWOW64\mnpdcisa\vcfazttn.exe /d"C:\Users\Admin\AppData\Local\Temp\77b5c60d25ee308a2c29e9363e105bfc42b3f0c6eb92285b620454f9c952d1eb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2016
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - Drops file in System32 directory
  - Modifies data under HKEY_USERS
  PID:1904

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

Disabling Security Tools

T1089

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\vcfazttn.exe

Filesize
14.4MB

MD5
649d62a13cad40b60bb6a0c44065a574

SHA1
fa23cc57af0e2dd40dbc8244731d6467bf6ec7d2

SHA256
82dafa715329ca2f026fe1f42c31eefb4a449077b3b11d3916c4091987f5aa03

SHA512
d28a121bf33cab395ab737f9d5ec373ba7c528068d15f756fd5f0ab29a1f27d9748111db28bd7aab3d4ec8210fdea5f5cbf8980d52bbba2b1ccf973d7bfb45a3

Download Submit
C:\Windows\SysWOW64\mnpdcisa\vcfazttn.exe

Filesize
14.4MB

MD5
649d62a13cad40b60bb6a0c44065a574

SHA1
fa23cc57af0e2dd40dbc8244731d6467bf6ec7d2

SHA256
82dafa715329ca2f026fe1f42c31eefb4a449077b3b11d3916c4091987f5aa03

SHA512
d28a121bf33cab395ab737f9d5ec373ba7c528068d15f756fd5f0ab29a1f27d9748111db28bd7aab3d4ec8210fdea5f5cbf8980d52bbba2b1ccf973d7bfb45a3

Download Submit
memory/1056-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/1056-65-0x0000000000400000-0x00000000004B3000-memory.dmp

Filesize
716KB

Download
memory/1904-61-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1904-60-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1904-62-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1904-67-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1904-68-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1904-69-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1904-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2016-66-0x0000000000400000-0x00000000004B3000-memory.dmp

Filesize
716KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads