tofsee | 5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839

General

Target

5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe
Size

106KB
MD5

8c122278e768601f20f1e9f6c407cce2
SHA1

a3f99a111ad0a22614a10337ef807607262aea61
SHA256

5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839
SHA512

11a1e995193b09ca342bb7a0c3203c0a41b7d83260666b8ac460c14c7c74c8683b00e407ddb97cceba87fb442635807b70eb9581326f886e6b673bee72096173

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:

ysurlhrw.exe

pid process

4616 ysurlhrw.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

5020 netsh.exe

pid	process
4616	ysurlhrw.exe

pid	process
5020	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\uwzrmkqm\ImagePath = "C:\\Windows\\SysWOW64\\uwzrmkqm\\ysurlhrw.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:

5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

ysurlhrw.exe

description pid process target process

PID 4616 set thread context of 2680 4616 ysurlhrw.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

3376 sc.exe
3532 sc.exe
4228 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 4616 set thread context of 2680	4616	ysurlhrw.exe	svchost.exe

pid	process
3376	sc.exe
3532	sc.exe
4228	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exeysurlhrw.exe

description	pid	process	target process
PID 3396 wrote to memory of 1688	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 1688	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 1688	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 2904	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 2904	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 2904	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	cmd.exe
PID 3396 wrote to memory of 3376	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 3376	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 3376	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 3532	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 3532	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 3532	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 4228	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 4228	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 4228	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	sc.exe
PID 3396 wrote to memory of 5020	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	netsh.exe
PID 3396 wrote to memory of 5020	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	netsh.exe
PID 3396 wrote to memory of 5020	3396	5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe	netsh.exe
PID 4616 wrote to memory of 2680	4616	ysurlhrw.exe	svchost.exe
PID 4616 wrote to memory of 2680	4616	ysurlhrw.exe	svchost.exe
PID 4616 wrote to memory of 2680	4616	ysurlhrw.exe	svchost.exe
PID 4616 wrote to memory of 2680	4616	ysurlhrw.exe	svchost.exe
PID 4616 wrote to memory of 2680	4616	ysurlhrw.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe
"C:\Users\Admin\AppData\Local\Temp\5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3396

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uwzrmkqm\
2⤵
PID:1688

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ysurlhrw.exe" C:\Windows\SysWOW64\uwzrmkqm\
2⤵
PID:2904

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create uwzrmkqm binPath= "C:\Windows\SysWOW64\uwzrmkqm\ysurlhrw.exe /d\"C:\Users\Admin\AppData\Local\Temp\5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:3376

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description uwzrmkqm "wifi internet conection"
2⤵
- Launches sc.exe
PID:3532

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start uwzrmkqm
2⤵
- Launches sc.exe
PID:4228

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:5020

C:\Windows\SysWOW64\uwzrmkqm\ysurlhrw.exe
C:\Windows\SysWOW64\uwzrmkqm\ysurlhrw.exe /d"C:\Users\Admin\AppData\Local\Temp\5527e07895f412771ae4350dfa825e5d08140073600ebd6aa321276b737cc839.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4616

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:2680

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\ysurlhrw.exe
Filesize
11.3MB

MD5
946b1dfa70090d84f19abf737f686a88

SHA1
9b31c5d38718423846b156602fd117bb8a76fa94

SHA256
733f07c33a9da25641f1d3bb294a0717dd7c01c891b2b983853bdf74d466a8cc

SHA512
692593e331e1b520577c1fbffd976989c4d7af13d412f6258a01b59017bb40ad397ab45b048f251795c26bb3ff84cf31336b6ef272983f78f243a1ff93732e8c

Download Submit
C:\Windows\SysWOW64\uwzrmkqm\ysurlhrw.exe
Filesize
11.3MB

MD5
946b1dfa70090d84f19abf737f686a88

SHA1
9b31c5d38718423846b156602fd117bb8a76fa94

SHA256
733f07c33a9da25641f1d3bb294a0717dd7c01c891b2b983853bdf74d466a8cc

SHA512
692593e331e1b520577c1fbffd976989c4d7af13d412f6258a01b59017bb40ad397ab45b048f251795c26bb3ff84cf31336b6ef272983f78f243a1ff93732e8c

Download Submit
memory/1688-132-0x0000000000000000-mapping.dmp

Download
memory/2680-143-0x0000000000EB0000-0x0000000000EC5000-memory.dmp

Filesize
84KB

Download
memory/2680-147-0x0000000000EB0000-0x0000000000EC5000-memory.dmp

Filesize
84KB

Download
memory/2680-146-0x0000000000EB0000-0x0000000000EC5000-memory.dmp

Filesize
84KB

Download
memory/2680-142-0x0000000000000000-mapping.dmp

Download
memory/2904-133-0x0000000000000000-mapping.dmp

Download
memory/3376-135-0x0000000000000000-mapping.dmp

Download
memory/3396-131-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3396-130-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3532-136-0x0000000000000000-mapping.dmp

Download
memory/4228-137-0x0000000000000000-mapping.dmp

Download
memory/4616-139-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4616-141-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/5020-140-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads