tofsee | e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f

General

Target

file.exe
Size

303KB
MD5

531df55984e2b66ad9f0dbd639de601e
SHA1

dc9d0df60d45c19e668e99a39946d1d39a5d9a09
SHA256

e3ffa663eeaa0eeda2b5cb06d094cb847f6520df57385c5d7fe5e49d01c99c8f
SHA512

1a2029171755e8c7f4f374af5544eef317a0d1635272991b7535f4406a99b4ef5d70985602fd85c8b9eb40de2215c81be496157821f78a013cea74ad2848e72b
SSDEEP

3072:MuFL7HO/Wc2L/rIUpqfM/FqdAt/XOM5TJDTnmhd+:xFL7HQ2LrI7fg2AtXJnmv+

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

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

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\owfapaal = "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

Processes:

netsh.exe

pid process

780 netsh.exe

pid	process
780	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\owfapaal\ImagePath = "C:\\Windows\\SysWOW64\\owfapaal\\zltqwjpn.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1476 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

zltqwjpn.exe

pid process

1116 zltqwjpn.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

zltqwjpn.exe

description pid process target process

PID 1116 set thread context of 1476 1116 zltqwjpn.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

1352 sc.exe
1052 sc.exe
388 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1476	svchost.exe

pid	process
1116	zltqwjpn.exe

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

description	pid	process	target process
PID 1116 set thread context of 1476	1116	zltqwjpn.exe	svchost.exe

pid	process
1352	sc.exe
1052	sc.exe
388	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exezltqwjpn.exe

description	pid	process	target process
PID 1496 wrote to memory of 1996	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1996	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1996	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1996	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1736	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1736	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1736	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1736	1496	file.exe	cmd.exe
PID 1496 wrote to memory of 1352	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1352	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1352	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1352	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1052	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1052	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1052	1496	file.exe	sc.exe
PID 1496 wrote to memory of 1052	1496	file.exe	sc.exe
PID 1496 wrote to memory of 388	1496	file.exe	sc.exe
PID 1496 wrote to memory of 388	1496	file.exe	sc.exe
PID 1496 wrote to memory of 388	1496	file.exe	sc.exe
PID 1496 wrote to memory of 388	1496	file.exe	sc.exe
PID 1496 wrote to memory of 780	1496	file.exe	netsh.exe
PID 1496 wrote to memory of 780	1496	file.exe	netsh.exe
PID 1496 wrote to memory of 780	1496	file.exe	netsh.exe
PID 1496 wrote to memory of 780	1496	file.exe	netsh.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe
PID 1116 wrote to memory of 1476	1116	zltqwjpn.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1496
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\owfapaal\
  2⤵
  PID:1996
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zltqwjpn.exe" C:\Windows\SysWOW64\owfapaal\
  2⤵
  PID:1736
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create owfapaal binPath= "C:\Windows\SysWOW64\owfapaal\zltqwjpn.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1352
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description owfapaal "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1052
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start owfapaal
  2⤵
  - Launches sc.exe
  PID:388
- 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:780

C:\Windows\SysWOW64\owfapaal\zltqwjpn.exe
C:\Windows\SysWOW64\owfapaal\zltqwjpn.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1116
- 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:1476

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

New Service

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
12.9MB

MD5
ae55c05898706f9b79f607eec080459b

SHA1
862b2183fa470a9c49a40f14ace691106a0c7a61

SHA256
037c5e439fa70fce474414855a83b309deb270281b63a9d1b3c301189a153d7d

SHA512
2632dac5ab35a2800e8b1874618f872266eb97dcafc5e653a7d44184f0e7c92440ee2e8842fc4cdd662057534b70691301b057373ad4deeb05c8671f0ad33bc8

Download Submit
C:\Windows\SysWOW64\owfapaal\zltqwjpn.exe

Filesize
12.9MB

MD5
ae55c05898706f9b79f607eec080459b

SHA1
862b2183fa470a9c49a40f14ace691106a0c7a61

SHA256
037c5e439fa70fce474414855a83b309deb270281b63a9d1b3c301189a153d7d

SHA512
2632dac5ab35a2800e8b1874618f872266eb97dcafc5e653a7d44184f0e7c92440ee2e8842fc4cdd662057534b70691301b057373ad4deeb05c8671f0ad33bc8

Download Submit
memory/1116-66-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/1476-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1476-63-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1476-62-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1476-64-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1476-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1476-70-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1476-72-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1496-59-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/1496-58-0x0000000000400000-0x0000000000A5C000-memory.dmp

Filesize
6.4MB

Download
memory/1496-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads