tofsee | 97e993ff871f0d3c484ec6059bd63ec6273d82e420aa96bda85062413b7e0609

General

Target

file.exe
Size

236KB
MD5

3a3fd09d4e781958df6e15153ec63bb9
SHA1

18801d0dffac6e42c37615f77ef7df3bf195d707
SHA256

97e993ff871f0d3c484ec6059bd63ec6273d82e420aa96bda85062413b7e0609
SHA512

dbb63aa3f318616c1e5bb0510cc046885483e08492d74ec175cce0817aa19393ca7b9e6cc1c722199317a2f44de3e863b771effd3aa6deb36f52ed6b0371fe0c
SSDEEP

3072:eDlY9dNSMxeDGJIBn9lX5WFN9MV2+TcqXt5T7CyNuF:3iMxeDGy9lXc9vbqD7YF

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\zlgzidox = "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

660 netsh.exe

pid	process
660	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\zlgzidox\ImagePath = "C:\\Windows\\SysWOW64\\zlgzidox\\oamrouth.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1316 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

oamrouth.exe

pid process

1912 oamrouth.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:

oamrouth.exe

description pid process target process

PID 1912 set thread context of 1316 1912 oamrouth.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

320 sc.exe
576 sc.exe
1508 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1316	svchost.exe

pid	process
1912	oamrouth.exe

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

description	pid	process	target process
PID 1912 set thread context of 1316	1912	oamrouth.exe	svchost.exe

pid	process
320	sc.exe
576	sc.exe
1508	sc.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

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

Processes:

file.exeoamrouth.exe

description	pid	process	target process
PID 2040 wrote to memory of 1940	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1940	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1940	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 1940	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 332	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 332	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 332	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 332	2040	file.exe	cmd.exe
PID 2040 wrote to memory of 320	2040	file.exe	sc.exe
PID 2040 wrote to memory of 320	2040	file.exe	sc.exe
PID 2040 wrote to memory of 320	2040	file.exe	sc.exe
PID 2040 wrote to memory of 320	2040	file.exe	sc.exe
PID 2040 wrote to memory of 576	2040	file.exe	sc.exe
PID 2040 wrote to memory of 576	2040	file.exe	sc.exe
PID 2040 wrote to memory of 576	2040	file.exe	sc.exe
PID 2040 wrote to memory of 576	2040	file.exe	sc.exe
PID 2040 wrote to memory of 1508	2040	file.exe	sc.exe
PID 2040 wrote to memory of 1508	2040	file.exe	sc.exe
PID 2040 wrote to memory of 1508	2040	file.exe	sc.exe
PID 2040 wrote to memory of 1508	2040	file.exe	sc.exe
PID 2040 wrote to memory of 660	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 660	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 660	2040	file.exe	netsh.exe
PID 2040 wrote to memory of 660	2040	file.exe	netsh.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.exe	svchost.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.exe	svchost.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.exe	svchost.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.exe	svchost.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.exe	svchost.exe
PID 1912 wrote to memory of 1316	1912	oamrouth.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:2040

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zlgzidox\
2⤵
PID:1940

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oamrouth.exe" C:\Windows\SysWOW64\zlgzidox\
2⤵
PID:332

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create zlgzidox binPath= "C:\Windows\SysWOW64\zlgzidox\oamrouth.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:320

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description zlgzidox "wifi internet conection"
2⤵
- Launches sc.exe
PID:576

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start zlgzidox
2⤵
- Launches sc.exe
PID:1508

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:660

C:\Windows\SysWOW64\zlgzidox\oamrouth.exe
C:\Windows\SysWOW64\zlgzidox\oamrouth.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1912

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:1316

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\oamrouth.exe
Filesize
14.4MB

MD5
491f3d5d70b4a98b1b539a680d34f585

SHA1
9572f9e93bc355df6e17554075b57ac377c0f4a1

SHA256
12c16293d3a05b8b2715189f928757961146004ed83902e149edfcb1566c8e92

SHA512
91a837fb749892d676c54574093474e234c50e7e71207c89cc26085f6f665b494fc9838feb763038bd5d5b7ff1bcf1dc6e76b598a767c87345edcd6fa42f2c1e

Download Submit
C:\Windows\SysWOW64\zlgzidox\oamrouth.exe
Filesize
14.4MB

MD5
491f3d5d70b4a98b1b539a680d34f585

SHA1
9572f9e93bc355df6e17554075b57ac377c0f4a1

SHA256
12c16293d3a05b8b2715189f928757961146004ed83902e149edfcb1566c8e92

SHA512
91a837fb749892d676c54574093474e234c50e7e71207c89cc26085f6f665b494fc9838feb763038bd5d5b7ff1bcf1dc6e76b598a767c87345edcd6fa42f2c1e

Download Submit
memory/1316-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1316-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1316-66-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1316-60-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1316-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1316-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1316-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1912-67-0x0000000000400000-0x0000000002B94000-memory.dmp

Filesize
39.6MB

Download
memory/2040-56-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2040-61-0x0000000000400000-0x0000000002B94000-memory.dmp

Filesize
39.6MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads