tofsee | f61b790784033096fb5f18ac2c17fa89b99a8ecebdd0e30148fe10133d42e8c0

General

Target

file.exe
Size

285KB
MD5

a21e695f7a2af53e5208781c8a75da08
SHA1

ad5000552a0b6dd28c8909287477ea9834b5ef48
SHA256

f61b790784033096fb5f18ac2c17fa89b99a8ecebdd0e30148fe10133d42e8c0
SHA512

875e52bd6bf5d15472adbf9a9a97f73c2af33e4629c54a43e3de4da41cad638ae27c55275725d3fc9400d690c3f4060161e52c928cdcc0b52be7838d8b952f59
SSDEEP

6144:i2W+rLe/H5vsW/n/8d2f3f0nxcVoR9tw:i23y/Z0u/pf3Axc+hw

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\yvsqnukr = "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

524 netsh.exe

pid	process
524	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\yvsqnukr\ImagePath = "C:\\Windows\\SysWOW64\\yvsqnukr\\jmjctvpf.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1468 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

jmjctvpf.exe

pid process

336 jmjctvpf.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:

jmjctvpf.exe

description pid process target process

PID 336 set thread context of 1468 336 jmjctvpf.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

1316 sc.exe
988 sc.exe
1748 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1468	svchost.exe

pid	process
336	jmjctvpf.exe

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

description	pid	process	target process
PID 336 set thread context of 1468	336	jmjctvpf.exe	svchost.exe

pid	process
1316	sc.exe
988	sc.exe
1748	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.exejmjctvpf.exe

description	pid	process	target process
PID 1704 wrote to memory of 892	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 892	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 892	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 892	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 756	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 756	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 756	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 756	1704	file.exe	cmd.exe
PID 1704 wrote to memory of 1316	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1316	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1316	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1316	1704	file.exe	sc.exe
PID 1704 wrote to memory of 988	1704	file.exe	sc.exe
PID 1704 wrote to memory of 988	1704	file.exe	sc.exe
PID 1704 wrote to memory of 988	1704	file.exe	sc.exe
PID 1704 wrote to memory of 988	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1748	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1748	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1748	1704	file.exe	sc.exe
PID 1704 wrote to memory of 1748	1704	file.exe	sc.exe
PID 1704 wrote to memory of 524	1704	file.exe	netsh.exe
PID 1704 wrote to memory of 524	1704	file.exe	netsh.exe
PID 1704 wrote to memory of 524	1704	file.exe	netsh.exe
PID 1704 wrote to memory of 524	1704	file.exe	netsh.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.exe	svchost.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.exe	svchost.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.exe	svchost.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.exe	svchost.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.exe	svchost.exe
PID 336 wrote to memory of 1468	336	jmjctvpf.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:1704

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yvsqnukr\
2⤵
PID:892

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jmjctvpf.exe" C:\Windows\SysWOW64\yvsqnukr\
2⤵
PID:756

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create yvsqnukr binPath= "C:\Windows\SysWOW64\yvsqnukr\jmjctvpf.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1316

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description yvsqnukr "wifi internet conection"
2⤵
- Launches sc.exe
PID:988

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start yvsqnukr
2⤵
- Launches sc.exe
PID:1748

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:524

C:\Windows\SysWOW64\yvsqnukr\jmjctvpf.exe
C:\Windows\SysWOW64\yvsqnukr\jmjctvpf.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:336

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:1468

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\jmjctvpf.exe
Filesize
13.1MB

MD5
a99442407e0082daf1fd187ba57f9717

SHA1
7fedf6e6408abd7744e7a622672707b5a040ac44

SHA256
2e2b65b1ee4e0b988e52e7e2051c0ac3e4740af0db6493702be037cef619f788

SHA512
d5f2db68e8028801a9a96e028b335e8be037439fdc99c8cfa0be7668c2ae033e58f96f7612c16950932c6039dc0a74449de0e6fad857d2479439e9217aa42134

Download Submit
C:\Windows\SysWOW64\yvsqnukr\jmjctvpf.exe
Filesize
13.1MB

MD5
a99442407e0082daf1fd187ba57f9717

SHA1
7fedf6e6408abd7744e7a622672707b5a040ac44

SHA256
2e2b65b1ee4e0b988e52e7e2051c0ac3e4740af0db6493702be037cef619f788

SHA512
d5f2db68e8028801a9a96e028b335e8be037439fdc99c8cfa0be7668c2ae033e58f96f7612c16950932c6039dc0a74449de0e6fad857d2479439e9217aa42134

Download Submit
memory/336-64-0x0000000000400000-0x0000000002363000-memory.dmp

Filesize
31.4MB

Download
memory/1468-62-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/1468-61-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1468-63-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1468-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1468-68-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1468-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1468-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1704-56-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/1704-60-0x0000000000400000-0x0000000002363000-memory.dmp

Filesize
31.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads