tofsee | 53240ff0a9160c77159782458342eb971f6b6b0a8a94733f878a6fe90c1661c9

General

Target

bafc60c6400d1952143edd3ca50ee960.exe
Size

14.2MB
MD5

bafc60c6400d1952143edd3ca50ee960
SHA1

29e68429e3b2e5c80e8657f27cbd12873e17ce10
SHA256

53240ff0a9160c77159782458342eb971f6b6b0a8a94733f878a6fe90c1661c9
SHA512

047e8852afd1f3f6520c45a4cda89fab06d3c5f6436886b224a269d224844d4f473a739cf22b5a0a2f0008c2ef64aa46fd60347519a452ff5c83615e225a4c20

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

nlsonwul.exe

pid process

1148 nlsonwul.exe
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031
Sets service image path in registry 2 TTPs
persistence

Registry Run Keys / Startup Folder
T1060

Modify Registry
T1112
Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

640 svchost.exe
Drops file in System32 directory 1 IoCs

Processes:

svchost.exe

description ioc process

File created C:\Windows\SysWOW64\config\systemprofile:.repos svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

nlsonwul.exe

description pid process target process

PID 1148 set thread context of 640 1148 nlsonwul.exe svchost.exe
Launches sc.exe
Sc.exe is a Windows utlilty to control services on the system.

pid	process
1148	nlsonwul.exe

pid	process
640	svchost.exe

description	ioc	process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

description	pid	process	target process
PID 1148 set thread context of 640	1148	nlsonwul.exe	svchost.exe

Modifies data under HKEY_USERS 2 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 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	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

bafc60c6400d1952143edd3ca50ee960.exenlsonwul.exe

description	pid	process	target process
PID 1036 wrote to memory of 2856	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 2856	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 2856	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 864	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 864	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 864	1036	bafc60c6400d1952143edd3ca50ee960.exe	cmd.exe
PID 1036 wrote to memory of 2692	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 2692	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 2692	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3180	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3180	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3180	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3704	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3704	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 3704	1036	bafc60c6400d1952143edd3ca50ee960.exe	sc.exe
PID 1036 wrote to memory of 800	1036	bafc60c6400d1952143edd3ca50ee960.exe	netsh.exe
PID 1036 wrote to memory of 800	1036	bafc60c6400d1952143edd3ca50ee960.exe	netsh.exe
PID 1036 wrote to memory of 800	1036	bafc60c6400d1952143edd3ca50ee960.exe	netsh.exe
PID 1148 wrote to memory of 640	1148	nlsonwul.exe	svchost.exe
PID 1148 wrote to memory of 640	1148	nlsonwul.exe	svchost.exe
PID 1148 wrote to memory of 640	1148	nlsonwul.exe	svchost.exe
PID 1148 wrote to memory of 640	1148	nlsonwul.exe	svchost.exe
PID 1148 wrote to memory of 640	1148	nlsonwul.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\bafc60c6400d1952143edd3ca50ee960.exe
"C:\Users\Admin\AppData\Local\Temp\bafc60c6400d1952143edd3ca50ee960.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1036

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\avazaddr\
2⤵
PID:2856

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nlsonwul.exe" C:\Windows\SysWOW64\avazaddr\
2⤵
PID:864

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create avazaddr binPath= "C:\Windows\SysWOW64\avazaddr\nlsonwul.exe /d\"C:\Users\Admin\AppData\Local\Temp\bafc60c6400d1952143edd3ca50ee960.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
PID:2692

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description avazaddr "wifi internet conection"
2⤵
PID:3180

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start avazaddr
2⤵
PID:3704

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⤵
PID:800

C:\Windows\SysWOW64\avazaddr\nlsonwul.exe
C:\Windows\SysWOW64\avazaddr\nlsonwul.exe /d"C:\Users\Admin\AppData\Local\Temp\bafc60c6400d1952143edd3ca50ee960.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1148

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:640

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

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nlsonwul.exe
MD5
3a42f54ab01cc30fedb5a074add447d8

SHA1
7054eef753989ef9799c1f5c7349b4a2454855d8

SHA256
6097bde56b17efa7451cd6b4e2e1914f2fc425d4e2459fe0904284eaa2a0f78b

SHA512
92a302e42f47d6dc04c7cebaa541b6a9c5fa589488814ff6867db4570f4ee5d34b21194f9f77f5e98b41b4172718c42b458eb678a6c27ddd37a8af64cfe214e7

Download Submit
C:\Windows\SysWOW64\avazaddr\nlsonwul.exe
MD5
3a42f54ab01cc30fedb5a074add447d8

SHA1
7054eef753989ef9799c1f5c7349b4a2454855d8

SHA256
6097bde56b17efa7451cd6b4e2e1914f2fc425d4e2459fe0904284eaa2a0f78b

SHA512
92a302e42f47d6dc04c7cebaa541b6a9c5fa589488814ff6867db4570f4ee5d34b21194f9f77f5e98b41b4172718c42b458eb678a6c27ddd37a8af64cfe214e7

Download Submit
memory/640-10-0x0000000003020000-0x0000000003035000-memory.dmp

Filesize
84KB

Download
memory/640-11-0x0000000003029A6B-mapping.dmp

Download
memory/640-12-0x0000000003020000-0x0000000003035000-memory.dmp

Filesize
84KB

Download
memory/800-9-0x0000000000000000-mapping.dmp

Download
memory/864-3-0x0000000000000000-mapping.dmp

Download
memory/2692-5-0x0000000000000000-mapping.dmp

Download
memory/2856-2-0x0000000000000000-mapping.dmp

Download
memory/3180-6-0x0000000000000000-mapping.dmp

Download
memory/3704-7-0x0000000000000000-mapping.dmp

Download

Analysis

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