tofsee | 3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f

General

Target

3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe
Size

99KB
MD5

2b126fbd0352c9ec2f7833af3d0df7ca
SHA1

3bf9cee470ad6cf126635570d89d9d9f30cef386
SHA256

3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f
SHA512

0dfb908197503bf9c1c9deeb015504d1b51d4c00857b34c3862f6c7fd9a4423acb0a068f1b63e2d6757b4c89f2d993e7913767c24d32763afd5e3c1ec43bdcc7

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:

jiyubxc.exe

pid process

4620 jiyubxc.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

4704 netsh.exe

pid	process
4620	jiyubxc.exe

pid	process
4704	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\knqfguzj\ImagePath = "C:\\Windows\\SysWOW64\\knqfguzj\\jiyubxc.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:

3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

jiyubxc.exe

description pid process target process

PID 4620 set thread context of 4688 4620 jiyubxc.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

3500 sc.exe
1412 sc.exe
1848 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 4620 set thread context of 4688	4620	jiyubxc.exe	svchost.exe

pid	process
3500	sc.exe
1412	sc.exe
1848	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exejiyubxc.exe

description	pid	process	target process
PID 2680 wrote to memory of 4960	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 4960	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 4960	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 3528	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 3528	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 3528	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	cmd.exe
PID 2680 wrote to memory of 3500	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 3500	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 3500	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1412	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1412	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1412	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1848	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1848	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 2680 wrote to memory of 1848	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	sc.exe
PID 4620 wrote to memory of 4688	4620	jiyubxc.exe	svchost.exe
PID 4620 wrote to memory of 4688	4620	jiyubxc.exe	svchost.exe
PID 4620 wrote to memory of 4688	4620	jiyubxc.exe	svchost.exe
PID 4620 wrote to memory of 4688	4620	jiyubxc.exe	svchost.exe
PID 4620 wrote to memory of 4688	4620	jiyubxc.exe	svchost.exe
PID 2680 wrote to memory of 4704	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	netsh.exe
PID 2680 wrote to memory of 4704	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	netsh.exe
PID 2680 wrote to memory of 4704	2680	3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe
"C:\Users\Admin\AppData\Local\Temp\3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2680

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\knqfguzj\
2⤵
PID:4960

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jiyubxc.exe" C:\Windows\SysWOW64\knqfguzj\
2⤵
PID:3528

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create knqfguzj binPath= "C:\Windows\SysWOW64\knqfguzj\jiyubxc.exe /d\"C:\Users\Admin\AppData\Local\Temp\3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3500

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description knqfguzj "wifi internet conection"
2⤵
- Launches sc.exe
PID:1412

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start knqfguzj
2⤵
- Launches sc.exe
PID:1848

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:4704

C:\Windows\SysWOW64\knqfguzj\jiyubxc.exe
C:\Windows\SysWOW64\knqfguzj\jiyubxc.exe /d"C:\Users\Admin\AppData\Local\Temp\3546db46d605f744a285fe60fcbacc6b686aa6fae4c32890b030924471e0e59f.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4620

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4688

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\jiyubxc.exe
Filesize
14.4MB

MD5
346eb43f42288d82bf8e676ed8c4ed6b

SHA1
1ea94c7c18999b2edc0e384b3ca3da1bb24c7a7b

SHA256
3da9706e824495112fdbe9a215ee5652e983f782475e286b2ae192e60b78efc3

SHA512
a57e50396000194d8c683bc04f1b00942596d191815038cff5760dd67eda53dafd7a2e5df7a0832994fa57fd90db1374699396a181980234d4f95287a159dca1

Download Submit
C:\Windows\SysWOW64\knqfguzj\jiyubxc.exe
Filesize
14.4MB

MD5
346eb43f42288d82bf8e676ed8c4ed6b

SHA1
1ea94c7c18999b2edc0e384b3ca3da1bb24c7a7b

SHA256
3da9706e824495112fdbe9a215ee5652e983f782475e286b2ae192e60b78efc3

SHA512
a57e50396000194d8c683bc04f1b00942596d191815038cff5760dd67eda53dafd7a2e5df7a0832994fa57fd90db1374699396a181980234d4f95287a159dca1

Download Submit
memory/1412-135-0x0000000000000000-mapping.dmp

Download
memory/1848-136-0x0000000000000000-mapping.dmp

Download
memory/2680-130-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/3500-134-0x0000000000000000-mapping.dmp

Download
memory/3528-132-0x0000000000000000-mapping.dmp

Download
memory/4620-138-0x0000000000400000-0x000000000041B000-memory.dmp

Filesize
108KB

Download
memory/4688-139-0x0000000000000000-mapping.dmp

Download
memory/4688-140-0x0000000000C00000-0x0000000000C15000-memory.dmp

Filesize
84KB

Download
memory/4688-144-0x0000000000C00000-0x0000000000C15000-memory.dmp

Filesize
84KB

Download
memory/4688-145-0x0000000000C00000-0x0000000000C15000-memory.dmp

Filesize
84KB

Download
memory/4704-141-0x0000000000000000-mapping.dmp

Download
memory/4960-131-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads