tofsee | 5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb

General

Target

5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe
Size

137KB
MD5

d9d34d8d20cf3b58ed3cca5d0c617dbd
SHA1

cd6e7f7b01361e49f986dd98475ad741fb436a53
SHA256

5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb
SHA512

042708d3ec9794b9045c4b96b5e5a59d9c6ad59e3c69e1eb1c31e47b720c23bca99bb4c837edfaf64f997a30ac0e54b617102cb72d00c7dcb671b88a82dc6004

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

bznzavtz.exe

pid process

2908 bznzavtz.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

632 netsh.exe

pid	process
2908	bznzavtz.exe

pid	process
632	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\qbtvaof\ImagePath = "C:\\Windows\\SysWOW64\\qbtvaof\\bznzavtz.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Control Panel\International\Geo\Nation	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

bznzavtz.exe

description pid process target process

PID 2908 set thread context of 3284 2908 bznzavtz.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

1436 sc.exe
4976 sc.exe
112 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 2908 set thread context of 3284	2908	bznzavtz.exe	svchost.exe

pid	process
1436	sc.exe
4976	sc.exe
112	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exebznzavtz.exe

description	pid	process	target process
PID 5112 wrote to memory of 2616	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 2616	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 2616	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 5084	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 5084	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 5084	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	cmd.exe
PID 5112 wrote to memory of 1436	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 1436	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 1436	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 4976	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 4976	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 4976	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 112	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 112	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 112	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	sc.exe
PID 5112 wrote to memory of 632	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	netsh.exe
PID 5112 wrote to memory of 632	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	netsh.exe
PID 5112 wrote to memory of 632	5112	5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe	netsh.exe
PID 2908 wrote to memory of 3284	2908	bznzavtz.exe	svchost.exe
PID 2908 wrote to memory of 3284	2908	bznzavtz.exe	svchost.exe
PID 2908 wrote to memory of 3284	2908	bznzavtz.exe	svchost.exe
PID 2908 wrote to memory of 3284	2908	bznzavtz.exe	svchost.exe
PID 2908 wrote to memory of 3284	2908	bznzavtz.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe
"C:\Users\Admin\AppData\Local\Temp\5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5112

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qbtvaof\
2⤵
PID:2616

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bznzavtz.exe" C:\Windows\SysWOW64\qbtvaof\
2⤵
PID:5084

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create qbtvaof binPath= "C:\Windows\SysWOW64\qbtvaof\bznzavtz.exe /d\"C:\Users\Admin\AppData\Local\Temp\5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1436

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description qbtvaof "wifi internet conection"
2⤵
- Launches sc.exe
PID:4976

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start qbtvaof
2⤵
- Launches sc.exe
PID:112

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:632

C:\Windows\SysWOW64\qbtvaof\bznzavtz.exe
C:\Windows\SysWOW64\qbtvaof\bznzavtz.exe /d"C:\Users\Admin\AppData\Local\Temp\5db2f772773cf804bafbf0801dc11a29093678fc9270cd1f350ab289557b91eb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2908

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:3284

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

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\bznzavtz.exe
Filesize
14.6MB

MD5
e66734c935839fe2899c879dd014694f

SHA1
44b19bb405c38e82f2101ab2d3bf1388964edfe5

SHA256
5aeebb836108303bf5f7ccb51f50428c19f0f8d4d9fd826f0fdb63ccdde30344

SHA512
924f498bd1eec1d3bcc445d68af61dd4c87b6bde036bd9bc98e167e821b8fc6cf893373270bcfc9caa9826ef92c387d83960f5caaadf65a7da6b8f7da1b39c99

Download Submit
C:\Windows\SysWOW64\qbtvaof\bznzavtz.exe
Filesize
14.6MB

MD5
e66734c935839fe2899c879dd014694f

SHA1
44b19bb405c38e82f2101ab2d3bf1388964edfe5

SHA256
5aeebb836108303bf5f7ccb51f50428c19f0f8d4d9fd826f0fdb63ccdde30344

SHA512
924f498bd1eec1d3bcc445d68af61dd4c87b6bde036bd9bc98e167e821b8fc6cf893373270bcfc9caa9826ef92c387d83960f5caaadf65a7da6b8f7da1b39c99

Download Submit
memory/112-136-0x0000000000000000-mapping.dmp

Download
memory/632-137-0x0000000000000000-mapping.dmp

Download
memory/1436-134-0x0000000000000000-mapping.dmp

Download
memory/2616-131-0x0000000000000000-mapping.dmp

Download
memory/2908-139-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/3284-141-0x0000000001200000-0x0000000001215000-memory.dmp

Filesize
84KB

Download
memory/3284-140-0x0000000000000000-mapping.dmp

Download
memory/3284-144-0x0000000001200000-0x0000000001215000-memory.dmp

Filesize
84KB

Download
memory/3284-145-0x0000000001200000-0x0000000001215000-memory.dmp

Filesize
84KB

Download
memory/4976-135-0x0000000000000000-mapping.dmp

Download
memory/5084-132-0x0000000000000000-mapping.dmp

Download
memory/5112-130-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads