tofsee | 53946e3295382ddab25a9800e0faef99a6a11fbeec0c2411788315596c90d903

General

Target

6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
Size

170KB
MD5

f5fd4237e550503a8eab51ae35f147b6
SHA1

869d44d58fb734b3692500dae1f42f0d6e3b3434
SHA256

6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd
SHA512

32327ca44e09d46ba8e656124f7480979b3eeb3769a94259d536a5223b2c532bd21654d8b4551d26265903f5c2be87a8da73d4571eee6fd9bfc887ea9e88350f
SSDEEP

1536:Js5KSNeteSXSI4nZ7OyP8p7+C1xIhQ6M3dfUMJn325pDedDT50ZXXKVXRKX:e5ScSHCO1p7hiO4AI1edHK56lR

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\yfrswdkp = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

2028 netsh.exe

pid	process
2028	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\yfrswdkp\ImagePath = "C:\\Windows\\SysWOW64\\yfrswdkp\\lbbykwmk.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2920 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

lbbykwmk.exe

pid process

2608 lbbykwmk.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:

lbbykwmk.exe

description pid process target process

PID 2608 set thread context of 2920 2608 lbbykwmk.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

2432 sc.exe
2004 sc.exe
2548 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2920	svchost.exe

pid	process
2608	lbbykwmk.exe

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

description	pid	process	target process
PID 2608 set thread context of 2920	2608	lbbykwmk.exe	svchost.exe

pid	process
2432	sc.exe
2004	sc.exe
2548	sc.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 30 IoCs

Processes:

6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exelbbykwmk.exe

description	pid	process	target process
PID 1284 wrote to memory of 2980	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2980	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2980	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2980	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2572	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2572	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2572	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2572	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	cmd.exe
PID 1284 wrote to memory of 2548	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2548	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2548	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2548	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2432	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2432	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2432	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2432	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2004	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2004	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2004	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2004	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	sc.exe
PID 1284 wrote to memory of 2028	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	netsh.exe
PID 1284 wrote to memory of 2028	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	netsh.exe
PID 1284 wrote to memory of 2028	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	netsh.exe
PID 1284 wrote to memory of 2028	1284	6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe	netsh.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe
PID 2608 wrote to memory of 2920	2608	lbbykwmk.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe
"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1284

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yfrswdkp\
2⤵
PID:2980

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lbbykwmk.exe" C:\Windows\SysWOW64\yfrswdkp\
2⤵
PID:2572

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create yfrswdkp binPath= "C:\Windows\SysWOW64\yfrswdkp\lbbykwmk.exe /d\"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:2548

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description yfrswdkp "wifi internet conection"
2⤵
- Launches sc.exe
PID:2432

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start yfrswdkp
2⤵
- Launches sc.exe
PID:2004

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:2028

C:\Windows\SysWOW64\yfrswdkp\lbbykwmk.exe
C:\Windows\SysWOW64\yfrswdkp\lbbykwmk.exe /d"C:\Users\Admin\AppData\Local\Temp\6fb0201dac82a2b6f3c409d74005eb50aab93abd7508f513636be051db86eefd.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2608

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
- Drops file in System32 directory
- Modifies data under HKEY_USERS
PID:2920

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify System Firewall

1

T1562.004

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\lbbykwmk.exe
Filesize
12.4MB

MD5
e63e2159b3653a41fdd04d6a4a950d8a

SHA1
f9abba680dd54254dc9b999bffaebe01d9290f82

SHA256
382bf2661f7cc45294d1f40f06fe32ad3b7cc1717c4509e3366fdbf8bfe73618

SHA512
b24be85fc2d42249e2125aa6048072696ab82ca5e89f3db48b955f58b754b158b0a6d065a36de29a4df2edbaea02b515208ae3afc51492a58d1e77030f347514

Download Submit
memory/1284-2-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/1284-1-0x00000000002B0000-0x00000000003B0000-memory.dmp

Filesize
1024KB

Download
memory/1284-3-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/1284-7-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/1284-8-0x00000000001B0000-0x00000000001C3000-memory.dmp

Filesize
76KB

Download
memory/2608-12-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/2608-10-0x0000000000560000-0x0000000000660000-memory.dmp

Filesize
1024KB

Download
memory/2608-16-0x0000000000400000-0x0000000000474000-memory.dmp

Filesize
464KB

Download
memory/2920-11-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2920-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2920-15-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2920-20-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2920-21-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download
memory/2920-23-0x00000000000C0000-0x00000000000D5000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads