tofsee | 241945fdc2d8e9d5dd8b40ae553d6c6a15a1b2ff3841f5fb174fc654832bad2e

Analysis

max time kernel
147s
max time network
119s
platform
windows7_x64
resource
win7v20201028
submitted
14/12/2020, 12:47

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General

Target
aec0249eb717fb18a6e5f6bbd811bb7c.exe
Size 11.3MB
Sample201214-dlsa631gh2
SHA256 241945fdc2d8e9d5dd8b40ae553d6c6a15a1b2ff3841f5fb174fc654832bad2e
MD5 aec0249eb717fb18a6e5f6bbd811bb7c
SHA1 b64f46fd11dd2a1b5d92a8f1f68103b8dfd4a550
SHA512 28b23446cec58506ca056984897defe3a0dc6c2d2f159e51b56cbd61814c0ff36f61643dccf4bc0d8ccb44671d2cdc5a30d461aaeeb76021686f575668c0d132
MD5 SHA1 SHA512

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

pid	Process
848	smolfblq.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

pid	Process
1468	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 848 set thread context of 1468	848	smolfblq.exe	40

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

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 372 wrote to memory of 1996	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	26
PID 372 wrote to memory of 1996	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	26
PID 372 wrote to memory of 1996	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	26
PID 372 wrote to memory of 1996	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	26
PID 372 wrote to memory of 1896	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	29
PID 372 wrote to memory of 1896	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	29
PID 372 wrote to memory of 1896	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	29
PID 372 wrote to memory of 1896	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	29
PID 372 wrote to memory of 1728	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	31
PID 372 wrote to memory of 1728	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	31
PID 372 wrote to memory of 1728	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	31
PID 372 wrote to memory of 1728	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	31
PID 372 wrote to memory of 1504	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	35
PID 372 wrote to memory of 1504	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	35
PID 372 wrote to memory of 1504	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	35
PID 372 wrote to memory of 1504	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	35
PID 372 wrote to memory of 1572	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	37
PID 372 wrote to memory of 1572	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	37
PID 372 wrote to memory of 1572	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	37
PID 372 wrote to memory of 1572	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	37
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 848 wrote to memory of 1468	848	smolfblq.exe	40
PID 372 wrote to memory of 824	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	41
PID 372 wrote to memory of 824	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	41
PID 372 wrote to memory of 824	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	41
PID 372 wrote to memory of 824	372	aec0249eb717fb18a6e5f6bbd811bb7c.exe	41

C:\Users\Admin\AppData\Local\Temp\aec0249eb717fb18a6e5f6bbd811bb7c.exe
"C:\Users\Admin\AppData\Local\Temp\aec0249eb717fb18a6e5f6bbd811bb7c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:372
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ewfsdvat\
  2⤵
  PID:1996
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\smolfblq.exe" C:\Windows\SysWOW64\ewfsdvat\
  2⤵
  PID:1896
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create ewfsdvat binPath= "C:\Windows\SysWOW64\ewfsdvat\smolfblq.exe /d\"C:\Users\Admin\AppData\Local\Temp\aec0249eb717fb18a6e5f6bbd811bb7c.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  PID:1728
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description ewfsdvat "wifi internet conection"
  2⤵
  PID:1504
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start ewfsdvat
  2⤵
  PID:1572
- 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:824

C:\Windows\SysWOW64\ewfsdvat\smolfblq.exe
C:\Windows\SysWOW64\ewfsdvat\smolfblq.exe /d"C:\Users\Admin\AppData\Local\Temp\aec0249eb717fb18a6e5f6bbd811bb7c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:848
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Deletes itself
  PID:1468

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

New Service

T1050

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

New Service

T1050

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1468-9-0x0000000000080000-0x0000000000095000-memory.dmp

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