tofsee | d4c8775b95b6d0f4c5384a6526afa7f00aeabb08aa6a1fe545e4193d60a2c205

General

Target

file.exe
Size

168KB
MD5

c8789056c4fa188b6f6d23e2da5e8655
SHA1

bffc6adeee841c0976e31d6518bab3f5e85bd589
SHA256

d4c8775b95b6d0f4c5384a6526afa7f00aeabb08aa6a1fe545e4193d60a2c205
SHA512

be89c3d2b76c2da856395a0d935206d9a1da034f501d8a029a8925903328cfad4e4d21ada9fe646e51fd046b197edf49f6666cc9b0d4fc2926009567cd20fba1
SSDEEP

3072:9omFCseno3BYS59iEemUxOCzpSu0Ih2Wzb:Rheo3BhezxpCIA

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\akqbjsgu = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

yadojdst.exe

pid process

1632 yadojdst.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

900 netsh.exe

pid	process
1632	yadojdst.exe

pid	process
900	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\akqbjsgu\ImagePath = "C:\\Windows\\SysWOW64\\akqbjsgu\\yadojdst.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1516 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

yadojdst.exe

description pid process target process

PID 1632 set thread context of 1516 1632 yadojdst.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

1692 sc.exe
1716 sc.exe
1868 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
1516	svchost.exe

description	pid	process	target process
PID 1632 set thread context of 1516	1632	yadojdst.exe	svchost.exe

pid	process
1692	sc.exe
1716	sc.exe
1868	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeyadojdst.exe

description	pid	process	target process
PID 2016 wrote to memory of 1896	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1896	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1896	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1896	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1724	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1724	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1724	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1724	2016	file.exe	cmd.exe
PID 2016 wrote to memory of 1692	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1692	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1692	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1692	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1716	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1716	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1716	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1716	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1868	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1868	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1868	2016	file.exe	sc.exe
PID 2016 wrote to memory of 1868	2016	file.exe	sc.exe
PID 2016 wrote to memory of 900	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 900	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 900	2016	file.exe	netsh.exe
PID 2016 wrote to memory of 900	2016	file.exe	netsh.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.exe	svchost.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.exe	svchost.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.exe	svchost.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.exe	svchost.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.exe	svchost.exe
PID 1632 wrote to memory of 1516	1632	yadojdst.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:2016

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\akqbjsgu\
2⤵
PID:1896

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yadojdst.exe" C:\Windows\SysWOW64\akqbjsgu\
2⤵
PID:1724

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create akqbjsgu binPath= "C:\Windows\SysWOW64\akqbjsgu\yadojdst.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1692

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description akqbjsgu "wifi internet conection"
2⤵
- Launches sc.exe
PID:1716

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start akqbjsgu
2⤵
- Launches sc.exe
PID:1868

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:900

C:\Windows\SysWOW64\akqbjsgu\yadojdst.exe
C:\Windows\SysWOW64\akqbjsgu\yadojdst.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1632

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1516

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\yadojdst.exe
Filesize
13.6MB

MD5
241d411b5bd9c10abff3fef9a955a804

SHA1
4caf4c3e35f091d6acfe773668f5e4692e537797

SHA256
0578d78625301b84e2e8ebdca3068c3eba0f42e5debbb30938f61d250f3ff975

SHA512
395dbb4ba7e888356d1b926e29f2ac1650411588d510270d17db4928c6aef26083477aabf34e38d30ac504f939271866a0509eb56d60115ef42940252e4f956e

Download Submit
C:\Windows\SysWOW64\akqbjsgu\yadojdst.exe
Filesize
13.6MB

MD5
241d411b5bd9c10abff3fef9a955a804

SHA1
4caf4c3e35f091d6acfe773668f5e4692e537797

SHA256
0578d78625301b84e2e8ebdca3068c3eba0f42e5debbb30938f61d250f3ff975

SHA512
395dbb4ba7e888356d1b926e29f2ac1650411588d510270d17db4928c6aef26083477aabf34e38d30ac504f939271866a0509eb56d60115ef42940252e4f956e

Download Submit
memory/900-65-0x0000000000000000-mapping.dmp

Download
memory/1516-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1516-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1516-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1516-78-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1516-72-0x0000000000089A6B-mapping.dmp

Download
memory/1632-77-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/1632-74-0x00000000008BB000-0x00000000008CC000-memory.dmp

Filesize
68KB

Download
memory/1692-61-0x0000000000000000-mapping.dmp

Download
memory/1716-62-0x0000000000000000-mapping.dmp

Download
memory/1724-59-0x0000000000000000-mapping.dmp

Download
memory/1868-63-0x0000000000000000-mapping.dmp

Download
memory/1896-55-0x0000000000000000-mapping.dmp

Download
memory/2016-67-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/2016-66-0x00000000002EB000-0x00000000002FC000-memory.dmp

Filesize
68KB

Download
memory/2016-54-0x0000000075A71000-0x0000000075A73000-memory.dmp

Filesize
8KB

Download
memory/2016-57-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2016-58-0x0000000000400000-0x000000000070B000-memory.dmp

Filesize
3.0MB

Download
memory/2016-56-0x00000000002EB000-0x00000000002FC000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads