tofsee | 74f055ccb9d657d623b62d41f22317c883d22e2cf4496b54d0d6ba5d1358d426

General

Target

50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe
Size

13.2MB
MD5

5c22dd0023f2924fd7804a0ddbf7ae78
SHA1

280c5a888f5e30d0858b809611c47308b4e8bab4
SHA256

50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8
SHA512

437e049e5ba7477b857b57f56f038f1f7d33e9edc78a5ac853eec6604aabe1eea801e45d4b9655aac230e5885a3a1e920d1b2d6409a215934f2768d0e167e254
SSDEEP

6144:UDVCynACXF+pI0zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzP:k8vmF+p

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation 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\yipmuiss = "0"	svchost.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002
Modifies Windows Firewall 2 TTPs 1 IoCs
evasion

Windows Service
T1543.003

Disable or Modify System Firewall
T1562.004

Processes:

netsh.exe

pid process

2852 netsh.exe

pid	process
2852	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\yipmuiss\ImagePath = "C:\\Windows\\SysWOW64\\yipmuiss\\bnvsylrp.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2884 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

bnvsylrp.exe

pid process

2764 bnvsylrp.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

bnvsylrp.exe

description pid process target process

PID 2764 set thread context of 2884 2764 bnvsylrp.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

2720 sc.exe
1884 sc.exe
2436 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2884	svchost.exe

pid	process
2764	bnvsylrp.exe

description	pid	process	target process
PID 2764 set thread context of 2884	2764	bnvsylrp.exe	svchost.exe

pid	process
2720	sc.exe
1884	sc.exe
2436	sc.exe

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

Processes:

netsh.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

bnvsylrp.exesvchost.execmd.exesc.exesc.exesc.exenetsh.exe50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.execmd.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bnvsylrp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exebnvsylrp.exe

description	pid	process	target process
PID 2516 wrote to memory of 1604	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1604	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1604	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1604	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1672	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1672	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1672	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1672	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	cmd.exe
PID 2516 wrote to memory of 1884	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 1884	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 1884	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 1884	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2436	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2436	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2436	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2436	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2720	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2720	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2720	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2516 wrote to memory of 2720	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	sc.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2764 wrote to memory of 2884	2764	bnvsylrp.exe	svchost.exe
PID 2516 wrote to memory of 2852	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	netsh.exe
PID 2516 wrote to memory of 2852	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	netsh.exe
PID 2516 wrote to memory of 2852	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	netsh.exe
PID 2516 wrote to memory of 2852	2516	50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe	netsh.exe

C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe
"C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2516
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yipmuiss\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1604
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnvsylrp.exe" C:\Windows\SysWOW64\yipmuiss\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1672
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yipmuiss binPath= "C:\Windows\SysWOW64\yipmuiss\bnvsylrp.exe /d\"C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1884
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yipmuiss "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2436
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yipmuiss
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2720
- 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
  - Event Triggered Execution: Netsh Helper DLL
  - System Location Discovery: System Language Discovery
  PID:2852

C:\Windows\SysWOW64\yipmuiss\bnvsylrp.exe
C:\Windows\SysWOW64\yipmuiss\bnvsylrp.exe /d"C:\Users\Admin\AppData\Local\Temp\50755e3eb1a407ef762cf957b272b483b314e911712c9e177b377efc8b1b5ea8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2764
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:2884

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

1

T1569

Service Execution

1

T1569.002

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

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

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

Event Triggered Execution

1

T1546

Netsh Helper DLL

1

T1546.007

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\bnvsylrp.exe

Filesize
11.5MB

MD5
e965ea20c95e6cc41fa341f7972806cc

SHA1
6c9a07a6ca3295677c0cb4cad3cbe0bc3e8bc1e8

SHA256
9b62aad634ce532eb7c8222013b1c357e673eb8ca0feab286a429aa1f8cec891

SHA512
e3aa115ee06402f7e59a67e0a8b6a74b5166b16359e53750cb5df1cfc22265747354957cab1e846d4b57ed40502fdf075cb706de21e29c7621a2a852268d954c

Download Submit
memory/2884-6-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2884-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2884-3-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2884-8-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2884-9-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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