tofsee | b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb

General

Target

b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe
Size

12.1MB
MD5

ffa1b8f70c8986ed5d92cc065e09e9d0
SHA1

a3dc175cbaf7da499dd09298e303144fac0ec032
SHA256

b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb
SHA512

60dcb3bb2d9720b8012452c57bfb4633ae5e14892bc99306a5d70864fa72dbdceae8278aec6ebf1223baf5d2ff2664b1fe88a728f8254a71ab41cd2fde3d8e4d
SSDEEP

24576:iW6y/MK+Iw9zXIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII:Z7X

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

patmushta.info

parubey.info

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Tofsee family
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\vahiwmjp = "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

2732 netsh.exe

pid	process
2732	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\vahiwmjp\ImagePath = "C:\\Windows\\SysWOW64\\vahiwmjp\\yocmosbw.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

2860 svchost.exe
Executes dropped EXE 1 IoCs

Processes:

yocmosbw.exe

pid process

2856 yocmosbw.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

yocmosbw.exe

description pid process target process

PID 2856 set thread context of 2860 2856 yocmosbw.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

2868 sc.exe
2684 sc.exe
2788 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
2860	svchost.exe

pid	process
2856	yocmosbw.exe

description	pid	process	target process
PID 2856 set thread context of 2860	2856	yocmosbw.exe	svchost.exe

pid	process
2868	sc.exe
2684	sc.exe
2788	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:

cmd.execmd.exesc.exesc.exesc.exeb41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exeyocmosbw.exesvchost.exenetsh.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	yocmosbw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exeyocmosbw.exe

description	pid	process	target process
PID 2084 wrote to memory of 1988	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 1988	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 1988	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 1988	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 3004	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 3004	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 3004	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 3004	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	cmd.exe
PID 2084 wrote to memory of 2868	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2868	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2868	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2868	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2684	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2684	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2684	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2684	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2788	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2788	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2788	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2788	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	sc.exe
PID 2084 wrote to memory of 2732	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	netsh.exe
PID 2084 wrote to memory of 2732	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	netsh.exe
PID 2084 wrote to memory of 2732	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	netsh.exe
PID 2084 wrote to memory of 2732	2084	b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe	netsh.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe
PID 2856 wrote to memory of 2860	2856	yocmosbw.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe
"C:\Users\Admin\AppData\Local\Temp\b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2084
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vahiwmjp\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1988
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yocmosbw.exe" C:\Windows\SysWOW64\vahiwmjp\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:3004
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create vahiwmjp binPath= "C:\Windows\SysWOW64\vahiwmjp\yocmosbw.exe /d\"C:\Users\Admin\AppData\Local\Temp\b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2868
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description vahiwmjp "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2684
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start vahiwmjp
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2788
- 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:2732

C:\Windows\SysWOW64\vahiwmjp\yocmosbw.exe
C:\Windows\SysWOW64\vahiwmjp\yocmosbw.exe /d"C:\Users\Admin\AppData\Local\Temp\b41909dc503614ac7de7748dc6cdbd38c09b0aaf13e0200162ddf06f30f17ceb.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2856
- 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:2860

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\yocmosbw.exe

Filesize
11.5MB

MD5
54135a71692c8478bffd426661d4aced

SHA1
b7deb5330e0ea0e16a72399ecd883f42c767c34e

SHA256
f5da1420123c02a703fbbd686ecd14c69f2a08bbd2f649aeeeadf7241c0767bc

SHA512
e089cf5056210b217529617efc9f489a14aefd2885710aa2631e098de31a94ab00549e685fc52b211af8bb85ef2e2a47da023904e7933c7bb6b44284460d5a32

Download Submit
memory/2084-9-0x0000000000620000-0x0000000000720000-memory.dmp

Filesize
1024KB

Download
memory/2084-3-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2084-2-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2084-7-0x0000000000400000-0x00000000004D9000-memory.dmp

Filesize
868KB

Download
memory/2084-10-0x0000000000400000-0x0000000000415000-memory.dmp

Filesize
84KB

Download
memory/2084-1-0x0000000000620000-0x0000000000720000-memory.dmp

Filesize
1024KB

Download
memory/2084-8-0x0000000000220000-0x0000000000233000-memory.dmp

Filesize
76KB

Download
memory/2856-16-0x0000000000400000-0x00000000004D9000-memory.dmp

Filesize
868KB

Download
memory/2860-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2860-15-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2860-14-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2860-18-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2860-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads