tofsee | 5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724

General

Target

5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe
Size

142KB
MD5

e4e980a178180b5aa5f096c10e9f5557
SHA1

f55b0a91c0cc81e61d6f23b8695ce4fa917f04d6
SHA256

5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724
SHA512

5f762ee974d14b69deb25266835644a20862f2da14f64bde6885ff27e1250b840d6cf44f3f3b36742b1502692f879382ccc59c8cab08d56b299cd8c71a3f6109

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:

cxxeamcu.exe

pid process

1356 cxxeamcu.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1772 netsh.exe

pid	process
1356	cxxeamcu.exe

pid	process
1772	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\phhiubmg\ImagePath = "C:\\Windows\\SysWOW64\\phhiubmg\\cxxeamcu.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1204 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

cxxeamcu.exe

description pid process target process

PID 1356 set thread context of 1204 1356 cxxeamcu.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

1880 sc.exe
656 sc.exe
1888 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
1204	svchost.exe

description	pid	process	target process
PID 1356 set thread context of 1204	1356	cxxeamcu.exe	svchost.exe

pid	process
1880	sc.exe
656	sc.exe
1888	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.execxxeamcu.exe

description	pid	process	target process
PID 1948 wrote to memory of 2016	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 2016	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 2016	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 2016	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 944	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 944	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 944	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 944	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 1948 wrote to memory of 1880	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1880	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1880	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1880	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 656	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 656	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 656	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 656	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1888	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1888	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1888	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1888	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 1948 wrote to memory of 1772	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 1948 wrote to memory of 1772	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 1948 wrote to memory of 1772	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 1948 wrote to memory of 1772	1948	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe
PID 1356 wrote to memory of 1204	1356	cxxeamcu.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe
"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1948

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\phhiubmg\
2⤵
PID:2016

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cxxeamcu.exe" C:\Windows\SysWOW64\phhiubmg\
2⤵
PID:944

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create phhiubmg binPath= "C:\Windows\SysWOW64\phhiubmg\cxxeamcu.exe /d\"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1880

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description phhiubmg "wifi internet conection"
2⤵
- Launches sc.exe
PID:656

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start phhiubmg
2⤵
- Launches sc.exe
PID:1888

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:1772

C:\Windows\SysWOW64\phhiubmg\cxxeamcu.exe
C:\Windows\SysWOW64\phhiubmg\cxxeamcu.exe /d"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1356

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
- Deletes itself
PID:1204

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

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\cxxeamcu.exe
Filesize
10.2MB

MD5
9f71711f451e411419960003ca9615ad

SHA1
5a642513266a86907a4a6c62726bf8ae5f5111e3

SHA256
fbe5e2bd65abedb6f82be139463e59ddc1290dd3dda77b7ed33c7a7e2b5dd429

SHA512
b14fb29ae5e13ea3de741a93278897ab44f616f0bef4250581458107a636e94a24b89bbcfdedebf6293bc11070ed446acbe9f3acebcf406c0ccd4b39554dde3b

Download Submit
C:\Windows\SysWOW64\phhiubmg\cxxeamcu.exe
Filesize
10.2MB

MD5
9f71711f451e411419960003ca9615ad

SHA1
5a642513266a86907a4a6c62726bf8ae5f5111e3

SHA256
fbe5e2bd65abedb6f82be139463e59ddc1290dd3dda77b7ed33c7a7e2b5dd429

SHA512
b14fb29ae5e13ea3de741a93278897ab44f616f0bef4250581458107a636e94a24b89bbcfdedebf6293bc11070ed446acbe9f3acebcf406c0ccd4b39554dde3b

Download Submit
memory/656-60-0x0000000000000000-mapping.dmp

Download
memory/944-57-0x0000000000000000-mapping.dmp

Download
memory/1204-69-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1204-67-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1204-70-0x0000000000089A6B-mapping.dmp

Download
memory/1204-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1204-74-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1204-75-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1356-65-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1772-62-0x0000000000000000-mapping.dmp

Download
memory/1880-59-0x0000000000000000-mapping.dmp

Download
memory/1888-61-0x0000000000000000-mapping.dmp

Download
memory/1948-55-0x0000000075141000-0x0000000075143000-memory.dmp

Filesize
8KB

Download
memory/1948-54-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/2016-56-0x0000000000000000-mapping.dmp

Download

Analysis

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