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:

cblcwujv.exe

pid process

2320 cblcwujv.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

1320 netsh.exe

pid	process
2320	cblcwujv.exe

pid	process
1320	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\klztlfjx\ImagePath = "C:\\Windows\\SysWOW64\\klztlfjx\\cblcwujv.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:

5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Control Panel\International\Geo\Nation	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

cblcwujv.exe

description pid process target process

PID 2320 set thread context of 1388 2320 cblcwujv.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

1092 sc.exe
992 sc.exe
1292 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 2320 set thread context of 1388	2320	cblcwujv.exe	svchost.exe

pid	process
1092	sc.exe
992	sc.exe
1292	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.execblcwujv.exe

description	pid	process	target process
PID 968 wrote to memory of 3268	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 3268	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 3268	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 3720	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 3720	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 3720	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	cmd.exe
PID 968 wrote to memory of 1092	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1092	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1092	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 992	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 992	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 992	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1292	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1292	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1292	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	sc.exe
PID 968 wrote to memory of 1320	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 968 wrote to memory of 1320	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 968 wrote to memory of 1320	968	5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe	netsh.exe
PID 2320 wrote to memory of 1388	2320	cblcwujv.exe	svchost.exe
PID 2320 wrote to memory of 1388	2320	cblcwujv.exe	svchost.exe
PID 2320 wrote to memory of 1388	2320	cblcwujv.exe	svchost.exe
PID 2320 wrote to memory of 1388	2320	cblcwujv.exe	svchost.exe
PID 2320 wrote to memory of 1388	2320	cblcwujv.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe
"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:968

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\klztlfjx\
2⤵
PID:3268

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cblcwujv.exe" C:\Windows\SysWOW64\klztlfjx\
2⤵
PID:3720

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create klztlfjx binPath= "C:\Windows\SysWOW64\klztlfjx\cblcwujv.exe /d\"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1092

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description klztlfjx "wifi internet conection"
2⤵
- Launches sc.exe
PID:992

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start klztlfjx
2⤵
- Launches sc.exe
PID:1292

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:1320

C:\Windows\SysWOW64\klztlfjx\cblcwujv.exe
C:\Windows\SysWOW64\klztlfjx\cblcwujv.exe /d"C:\Users\Admin\AppData\Local\Temp\5f999ebf50703e544ffae3c27d30df4441a54f12360e7482135c02f58b95f724.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2320

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:1388

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\cblcwujv.exe
Filesize
10.8MB

MD5
a9dc4a0463d139ddb0d3af7ff27f49fd

SHA1
065661ca2f2932aacf40fac82b7fda682fbc2271

SHA256
2cc390bde2bf0b12cdb5709135b47c5306c2d5acc04d5589838cb1c30a00b5b6

SHA512
415daf8f7555081b1e0cdaec30bb0198e2bbab72d5c337ee211a45340f890acffd157e0a564875fbdc1960e8ec186c5f92d24967d399a6de4486931b8f41aa0f

Download Submit
C:\Windows\SysWOW64\klztlfjx\cblcwujv.exe
Filesize
10.8MB

MD5
a9dc4a0463d139ddb0d3af7ff27f49fd

SHA1
065661ca2f2932aacf40fac82b7fda682fbc2271

SHA256
2cc390bde2bf0b12cdb5709135b47c5306c2d5acc04d5589838cb1c30a00b5b6

SHA512
415daf8f7555081b1e0cdaec30bb0198e2bbab72d5c337ee211a45340f890acffd157e0a564875fbdc1960e8ec186c5f92d24967d399a6de4486931b8f41aa0f

Download Submit
memory/968-130-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/992-135-0x0000000000000000-mapping.dmp

Download
memory/1092-134-0x0000000000000000-mapping.dmp

Download
memory/1292-136-0x0000000000000000-mapping.dmp

Download
memory/1320-137-0x0000000000000000-mapping.dmp

Download
memory/1388-140-0x0000000000000000-mapping.dmp

Download
memory/1388-141-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/1388-143-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/1388-144-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/1388-145-0x0000000000ED0000-0x0000000000EE5000-memory.dmp

Filesize
84KB

Download
memory/2320-139-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/3268-131-0x0000000000000000-mapping.dmp

Download
memory/3720-132-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads