tofsee | 3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560

General

Target

3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe
Size

139KB
MD5

a2300b70e5420a971e380a21c4469387
SHA1

3fbd333c6314e91f9adf89a1b32186156c6d34bb
SHA256

3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560
SHA512

2fbab93c5e9c50d5a1d8a03a3e26b0d13f84cd442afe2cd35e51c900e8495fb873abd49da2e83e7df1318f5297fde44355755acc92e8f2176b1de6246c2f1a03

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:

rvcmmakg.exe

pid process

676 rvcmmakg.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1668 netsh.exe

pid	process
676	rvcmmakg.exe

pid	process
1668	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\wpheegts\ImagePath = "C:\\Windows\\SysWOW64\\wpheegts\\rvcmmakg.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:

3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

rvcmmakg.exe

description pid process target process

PID 676 set thread context of 1528 676 rvcmmakg.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

4308 sc.exe
4152 sc.exe
3628 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 676 set thread context of 1528	676	rvcmmakg.exe	svchost.exe

pid	process
4308	sc.exe
4152	sc.exe
3628	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exervcmmakg.exe

description	pid	process	target process
PID 3976 wrote to memory of 1760	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 1760	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 1760	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 4052	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 4052	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 4052	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	cmd.exe
PID 3976 wrote to memory of 4152	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 4152	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 4152	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 3628	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 3628	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 3628	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 4308	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 4308	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 4308	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	sc.exe
PID 3976 wrote to memory of 1668	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	netsh.exe
PID 3976 wrote to memory of 1668	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	netsh.exe
PID 3976 wrote to memory of 1668	3976	3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe	netsh.exe
PID 676 wrote to memory of 1528	676	rvcmmakg.exe	svchost.exe
PID 676 wrote to memory of 1528	676	rvcmmakg.exe	svchost.exe
PID 676 wrote to memory of 1528	676	rvcmmakg.exe	svchost.exe
PID 676 wrote to memory of 1528	676	rvcmmakg.exe	svchost.exe
PID 676 wrote to memory of 1528	676	rvcmmakg.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe
"C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3976

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wpheegts\
2⤵
PID:1760

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rvcmmakg.exe" C:\Windows\SysWOW64\wpheegts\
2⤵
PID:4052

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create wpheegts binPath= "C:\Windows\SysWOW64\wpheegts\rvcmmakg.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:4152

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description wpheegts "wifi internet conection"
2⤵
- Launches sc.exe
PID:3628

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start wpheegts
2⤵
- Launches sc.exe
PID:4308

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:1668

C:\Windows\SysWOW64\wpheegts\rvcmmakg.exe
C:\Windows\SysWOW64\wpheegts\rvcmmakg.exe /d"C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:676

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1528

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\rvcmmakg.exe
Filesize
12.5MB

MD5
38b80ef95c21e176fc0a79a9578a1b2f

SHA1
1fb195a60d0c7cc041a65cf5f6f817c7c40eaa46

SHA256
277230c418e70d983945ca2112eb3168efbed56c2fd9f1d1c1bd59edfd464939

SHA512
d8cf7e3f4aaffe35133381092d817720ee5ca0d67a1eb4f35efd0e856b25c035597daae6fb9f842a007efdb9c371ac42793c611be943cea192ba6707d7df0347

Download Submit
C:\Windows\SysWOW64\wpheegts\rvcmmakg.exe
Filesize
12.5MB

MD5
38b80ef95c21e176fc0a79a9578a1b2f

SHA1
1fb195a60d0c7cc041a65cf5f6f817c7c40eaa46

SHA256
277230c418e70d983945ca2112eb3168efbed56c2fd9f1d1c1bd59edfd464939

SHA512
d8cf7e3f4aaffe35133381092d817720ee5ca0d67a1eb4f35efd0e856b25c035597daae6fb9f842a007efdb9c371ac42793c611be943cea192ba6707d7df0347

Download Submit
memory/676-139-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/1528-140-0x0000000000000000-mapping.dmp

Download
memory/1528-141-0x00000000010D0000-0x00000000010E5000-memory.dmp

Filesize
84KB

Download
memory/1528-144-0x00000000010D0000-0x00000000010E5000-memory.dmp

Filesize
84KB

Download
memory/1528-145-0x00000000010D0000-0x00000000010E5000-memory.dmp

Filesize
84KB

Download
memory/1668-138-0x0000000000000000-mapping.dmp

Download
memory/1760-131-0x0000000000000000-mapping.dmp

Download
memory/3628-135-0x0000000000000000-mapping.dmp

Download
memory/3976-130-0x0000000000400000-0x0000000000425000-memory.dmp

Filesize
148KB

Download
memory/4052-132-0x0000000000000000-mapping.dmp

Download
memory/4152-134-0x0000000000000000-mapping.dmp

Download
memory/4308-136-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads