tofsee | 1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1

General

Target

1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe
Size

102KB
MD5

b615ff689101509b760415b534294205
SHA1

5850c0b7a2783482c093aeed72ab212b0dabe6fe
SHA256

1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1
SHA512

1eb7f5b08d9fd19a26f1f75368dbd9e0af74c9bfeb361a8d5ad89c67c3b9562038d78e4621df2723b8176e28418c74500c5dd6ac9ac04b898783d8e0384fc3b4

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:

zzyepdkn.exe

pid process

4700 zzyepdkn.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

3244 netsh.exe

pid	process
4700	zzyepdkn.exe

pid	process
3244	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\nsvhrnzb\ImagePath = "C:\\Windows\\SysWOW64\\nsvhrnzb\\zzyepdkn.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:

1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2632097139-1792035885-811742494-1000\Control Panel\International\Geo\Nation	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

zzyepdkn.exe

description pid process target process

PID 4700 set thread context of 4900 4700 zzyepdkn.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

2340 sc.exe
4004 sc.exe
2504 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 4700 set thread context of 4900	4700	zzyepdkn.exe	svchost.exe

pid	process
2340	sc.exe
4004	sc.exe
2504	sc.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exezzyepdkn.exe

description	pid	process	target process
PID 2692 wrote to memory of 3468	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 3468	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 3468	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 1640	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 1640	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 1640	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	cmd.exe
PID 2692 wrote to memory of 2340	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 2340	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 2340	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 4004	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 4004	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 4004	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 2504	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 2504	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 2692 wrote to memory of 2504	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	sc.exe
PID 4700 wrote to memory of 4900	4700	zzyepdkn.exe	svchost.exe
PID 4700 wrote to memory of 4900	4700	zzyepdkn.exe	svchost.exe
PID 4700 wrote to memory of 4900	4700	zzyepdkn.exe	svchost.exe
PID 4700 wrote to memory of 4900	4700	zzyepdkn.exe	svchost.exe
PID 4700 wrote to memory of 4900	4700	zzyepdkn.exe	svchost.exe
PID 2692 wrote to memory of 3244	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	netsh.exe
PID 2692 wrote to memory of 3244	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	netsh.exe
PID 2692 wrote to memory of 3244	2692	1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe
"C:\Users\Admin\AppData\Local\Temp\1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2692

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nsvhrnzb\
2⤵
PID:3468

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zzyepdkn.exe" C:\Windows\SysWOW64\nsvhrnzb\
2⤵
PID:1640

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create nsvhrnzb binPath= "C:\Windows\SysWOW64\nsvhrnzb\zzyepdkn.exe /d\"C:\Users\Admin\AppData\Local\Temp\1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2340

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description nsvhrnzb "wifi internet conection"
2⤵
- Launches sc.exe
PID:4004

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start nsvhrnzb
2⤵
- Launches sc.exe
PID:2504

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:3244

C:\Windows\SysWOW64\nsvhrnzb\zzyepdkn.exe
C:\Windows\SysWOW64\nsvhrnzb\zzyepdkn.exe /d"C:\Users\Admin\AppData\Local\Temp\1c7dfbd2d886ecd2ebfa7f4c6f6e4b9e4fd0f87f628effbfd62a53c3070861b1.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4700

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Sets service image path in registry
PID:4900

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\zzyepdkn.exe
Filesize
14.3MB

MD5
6c370adae0e7a51d67c02998ef328d07

SHA1
b87b7eaa228d53118ea3b6fc6ca2e6b6bc2ebc64

SHA256
025c047de23349b0762ef6ada53e1e22c734e1ccfce4246e925066a2c73ace7f

SHA512
994c6aa3747d0cc50553f0d183cfaeb35c9c0dfb6d5bfc5169951266b826f96297c77bf471cdb416f1b3dbbc8a0f1602502d3e7c4ce2530408bf011e07865948

Download Submit
C:\Windows\SysWOW64\nsvhrnzb\zzyepdkn.exe
Filesize
14.3MB

MD5
6c370adae0e7a51d67c02998ef328d07

SHA1
b87b7eaa228d53118ea3b6fc6ca2e6b6bc2ebc64

SHA256
025c047de23349b0762ef6ada53e1e22c734e1ccfce4246e925066a2c73ace7f

SHA512
994c6aa3747d0cc50553f0d183cfaeb35c9c0dfb6d5bfc5169951266b826f96297c77bf471cdb416f1b3dbbc8a0f1602502d3e7c4ce2530408bf011e07865948

Download Submit
memory/1640-132-0x0000000000000000-mapping.dmp

Download
memory/2340-134-0x0000000000000000-mapping.dmp

Download
memory/2504-136-0x0000000000000000-mapping.dmp

Download
memory/2692-130-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/3244-142-0x0000000000000000-mapping.dmp

Download
memory/3468-131-0x0000000000000000-mapping.dmp

Download
memory/4004-135-0x0000000000000000-mapping.dmp

Download
memory/4700-138-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/4900-139-0x0000000000000000-mapping.dmp

Download
memory/4900-140-0x0000000000D20000-0x0000000000D35000-memory.dmp

Filesize
84KB

Download
memory/4900-144-0x0000000000D20000-0x0000000000D35000-memory.dmp

Filesize
84KB

Download
memory/4900-145-0x0000000000D20000-0x0000000000D35000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads