tofsee | 54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7

General

Target
54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe
Size 12.6MB
Sample261108-k887daby3k
SHA256 54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7
MD5 5be51bb6af6434fa164d3769c32e5209
SHA1 007af6d54cb16998e82633fe83bd7930b06f0c79
SHA512 5257e4b9c1171c75a3a03dd139a51e45434c47a6d926de67c1d06fc518495ce12b7b31c905081cc29ce9a736be79ef50afce93c9dd6d151426631993ff8782bd
SSDEEP 49152:RBp2Jrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv3:RK
TLSH
T15DD6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution tofsee persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru
refabyd.info

Signatures

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

Modifies Windows Firewall 2 TTPs 1 IoCs

defense_evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2536	netsh.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Executes dropped EXE 1 IoCs

pid	Process
2108	gsnkrqqe.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2108 set thread context of 1256	2108	gsnkrqqe.exe	101

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
4828	sc.exe
4608	sc.exe
296	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

description	ioc	Process
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
5732	cmd.exe
1260	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 8 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.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	gsnkrqqe.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4076 wrote to memory of 1260	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	89
PID 4076 wrote to memory of 5732	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	91
PID 4076 wrote to memory of 4828	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	93
PID 4076 wrote to memory of 4608	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	96
PID 4076 wrote to memory of 296	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	98
PID 2108 wrote to memory of 1256	2108	gsnkrqqe.exe	101
PID 2108 wrote to memory of 1256	2108	gsnkrqqe.exe	101
PID 4076 wrote to memory of 2536	4076	54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe	102

C:\Users\Admin\AppData\Local\Temp\54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe
"C:\Users\Admin\AppData\Local\Temp\54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4076
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ydkeysvm\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:1260
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gsnkrqqe.exe" C:\Windows\SysWOW64\ydkeysvm\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5732
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ydkeysvm binPath= "C:\Windows\SysWOW64\ydkeysvm\gsnkrqqe.exe /d\"C:\Users\Admin\AppData\Local\Temp\54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4828
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ydkeysvm "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4608
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ydkeysvm
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:296
- 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:2536

C:\Windows\SysWOW64\ydkeysvm\gsnkrqqe.exe
C:\Windows\SysWOW64\ydkeysvm\gsnkrqqe.exe /d"C:\Users\Admin\AppData\Local\Temp\54d93aca6578dc911dc6abcb167e0f93b263a158a87d9124d73106628c80ace7.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2108
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:1256

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

System Services

1

T1569

Service Execution

1

T1569.002

Persistence

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

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

1

T1562

Disable or Modify System Firewall

1

T1562.004

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

gsnkrqqe.exe

Path C:\Users\Admin\AppData\Local\Temp\gsnkrqqe.exe
Size 12.7MB
SHA256 1a0b798f39392ac4ded3b9702e3c2e3ceefedd25439adaffc955db538b40b859
MD5 1203f3a2bacbc636df889a7dfeb7bf9c
SHA1 e38f895ea4bf275c437024f439762e102926250a
SHA512 04d506084da9ae0faa12706434b702f2975cf82bb5d66fefb2679521a93fb84f0370cb18780d869ba4aea8730dcbc9d3510463d945c43b4fbc29d7a25eab1514
SSDEEP 49152:PBp2Jrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrvrv/:PK
TLSH
T1E4D6436676D86ED9D0CA0FBC09A1C42B5DECFB34043A553096D1504F98AE78A973CBB3
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1256-6-0x0000000001060000-0x00000000010A9000-memory.dmp

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memory/2108-5-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2108-9-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4076-0-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/4076-10-0x0000000000400000-0x0000000000449000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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