tofsee | 29958e28ed0f0649797e2d6450d934c6022ab672105e32283d3f8090f2f48fe5

General

Target

file.exe
Size

192KB
MD5

99c46fe2f6560e5f52c912fe41ebf031
SHA1

09cfc9287b737405326a14ed100b0d109386b188
SHA256

29958e28ed0f0649797e2d6450d934c6022ab672105e32283d3f8090f2f48fe5
SHA512

8aa7c5fdf6fb15ebe857f1046daea8c47bb400110702f1ab02f96c0f75721753821d55e64ff0977903b526b3ca8cc0330e88944582e1a925e21f39614da9acec
SSDEEP

3072:ag7i0AlCXTi2I5VPJmVtmIq9lj/iZqXQ/8nzkNaRs9E3AZxpR/wQnzhx:3iUTi9BY8I///8n45vp+a

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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\ymabzhin = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

bhzotmd.exe

pid process

1048 bhzotmd.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1784 netsh.exe

pid	process
1048	bhzotmd.exe

pid	process
1784	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\ymabzhin\ImagePath = "C:\\Windows\\SysWOW64\\ymabzhin\\bhzotmd.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1864 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

bhzotmd.exe

description pid process target process

PID 1048 set thread context of 1864 1048 bhzotmd.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

2004 sc.exe
776 sc.exe
528 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
1864	svchost.exe

description	pid	process	target process
PID 1048 set thread context of 1864	1048	bhzotmd.exe	svchost.exe

pid	process
2004	sc.exe
776	sc.exe
528	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exebhzotmd.exe

description	pid	process	target process
PID 748 wrote to memory of 940	748	file.exe	cmd.exe
PID 748 wrote to memory of 940	748	file.exe	cmd.exe
PID 748 wrote to memory of 940	748	file.exe	cmd.exe
PID 748 wrote to memory of 940	748	file.exe	cmd.exe
PID 748 wrote to memory of 1792	748	file.exe	cmd.exe
PID 748 wrote to memory of 1792	748	file.exe	cmd.exe
PID 748 wrote to memory of 1792	748	file.exe	cmd.exe
PID 748 wrote to memory of 1792	748	file.exe	cmd.exe
PID 748 wrote to memory of 2004	748	file.exe	sc.exe
PID 748 wrote to memory of 2004	748	file.exe	sc.exe
PID 748 wrote to memory of 2004	748	file.exe	sc.exe
PID 748 wrote to memory of 2004	748	file.exe	sc.exe
PID 748 wrote to memory of 776	748	file.exe	sc.exe
PID 748 wrote to memory of 776	748	file.exe	sc.exe
PID 748 wrote to memory of 776	748	file.exe	sc.exe
PID 748 wrote to memory of 776	748	file.exe	sc.exe
PID 748 wrote to memory of 528	748	file.exe	sc.exe
PID 748 wrote to memory of 528	748	file.exe	sc.exe
PID 748 wrote to memory of 528	748	file.exe	sc.exe
PID 748 wrote to memory of 528	748	file.exe	sc.exe
PID 748 wrote to memory of 1784	748	file.exe	netsh.exe
PID 748 wrote to memory of 1784	748	file.exe	netsh.exe
PID 748 wrote to memory of 1784	748	file.exe	netsh.exe
PID 748 wrote to memory of 1784	748	file.exe	netsh.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.exe	svchost.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.exe	svchost.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.exe	svchost.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.exe	svchost.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.exe	svchost.exe
PID 1048 wrote to memory of 1864	1048	bhzotmd.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:748

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ymabzhin\
2⤵
PID:940

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bhzotmd.exe" C:\Windows\SysWOW64\ymabzhin\
2⤵
PID:1792

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create ymabzhin binPath= "C:\Windows\SysWOW64\ymabzhin\bhzotmd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2004

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description ymabzhin "wifi internet conection"
2⤵
- Launches sc.exe
PID:776

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start ymabzhin
2⤵
- Launches sc.exe
PID:528

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:1784

C:\Windows\SysWOW64\ymabzhin\bhzotmd.exe
C:\Windows\SysWOW64\ymabzhin\bhzotmd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1048

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1864

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\bhzotmd.exe
Filesize
13.4MB

MD5
f7b5792c96c662b089c97808896f1124

SHA1
52e13e7d2173d4ea255de47ad8f3384e713372cf

SHA256
e3f723b354857992925327859909b82e5801bd149d72fd3a37089086b61f270f

SHA512
a78b67eee4905c86f485cb9ddf230b4ac35e7d8d7a056f1ea15f87c1230d65ebfbe039b00a244f54f2dda1efafbd744b02e3685251d45f86d3af46d80665e0ab

Download Submit
C:\Windows\SysWOW64\ymabzhin\bhzotmd.exe
Filesize
13.4MB

MD5
f7b5792c96c662b089c97808896f1124

SHA1
52e13e7d2173d4ea255de47ad8f3384e713372cf

SHA256
e3f723b354857992925327859909b82e5801bd149d72fd3a37089086b61f270f

SHA512
a78b67eee4905c86f485cb9ddf230b4ac35e7d8d7a056f1ea15f87c1230d65ebfbe039b00a244f54f2dda1efafbd744b02e3685251d45f86d3af46d80665e0ab

Download Submit
memory/528-63-0x0000000000000000-mapping.dmp

Download
memory/748-58-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/748-54-0x000000000028B000-0x000000000029C000-memory.dmp

Filesize
68KB

Download
memory/748-56-0x0000000074FB1000-0x0000000074FB3000-memory.dmp

Filesize
8KB

Download
memory/748-65-0x000000000028B000-0x000000000029C000-memory.dmp

Filesize
68KB

Download
memory/748-66-0x0000000000250000-0x0000000000263000-memory.dmp

Filesize
76KB

Download
memory/748-67-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/748-55-0x0000000000250000-0x0000000000263000-memory.dmp

Filesize
76KB

Download
memory/776-62-0x0000000000000000-mapping.dmp

Download
memory/940-57-0x0000000000000000-mapping.dmp

Download
memory/1048-74-0x000000000030B000-0x000000000031C000-memory.dmp

Filesize
68KB

Download
memory/1048-75-0x0000000000400000-0x0000000000466000-memory.dmp

Filesize
408KB

Download
memory/1784-64-0x0000000000000000-mapping.dmp

Download
memory/1792-59-0x0000000000000000-mapping.dmp

Download
memory/1864-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1864-73-0x00000000000C9A6B-mapping.dmp

Download
memory/1864-70-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1864-78-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1864-79-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/1864-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2004-61-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads