tofsee | ace1a8cfaadbf893f5369b0c743cfa4510fdf1e224fc647e079be3505cc37e75

Analysis

max time kernel
144s
max time network
157s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
24/12/2023, 22:56

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
17793fa0148e476a8a35c0a1106499df.exe
Size 14.0MB
Sample231224-2w7lfsada6
SHA256 ace1a8cfaadbf893f5369b0c743cfa4510fdf1e224fc647e079be3505cc37e75
MD5 17793fa0148e476a8a35c0a1106499df
SHA1 d26a046fc0b5b6f624bd9e5435f18399fc7199e4
SHA512 b2907c8e194aaf6c89db9d60bc7770674ac53153d7057dd25da3eaf2881ff5d098946e7b85d3e212504c21b6c9169d82702e4664e41bb07f7bef2f8e22978056
SSDEEP 49152:Y3SkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkH:Y3
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.6
lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
1536	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\pencfplk\ImagePath = "C:\\Windows\\SysWOW64\\pencfplk\\txiaelms.exe"	svchost.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-983843758-932321429-1636175382-1000\Control Panel\International\Geo\Nation	17793fa0148e476a8a35c0a1106499df.exe

Deletes itself 1 IoCs

pid	Process
3872	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2860	txiaelms.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2860 set thread context of 3872	2860	txiaelms.exe	108

Launches sc.exe 3 IoCs

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

pid	Process
1708	sc.exe
4924	sc.exe
1212	sc.exe

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

System Information Discovery
T1082

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3128	2860	WerFault.exe	104
3524	4680	WerFault.exe	87

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4680 wrote to memory of 4684	4680	17793fa0148e476a8a35c0a1106499df.exe	91
PID 4680 wrote to memory of 4684	4680	17793fa0148e476a8a35c0a1106499df.exe	91
PID 4680 wrote to memory of 4684	4680	17793fa0148e476a8a35c0a1106499df.exe	91
PID 4680 wrote to memory of 1820	4680	17793fa0148e476a8a35c0a1106499df.exe	94
PID 4680 wrote to memory of 1820	4680	17793fa0148e476a8a35c0a1106499df.exe	94
PID 4680 wrote to memory of 1820	4680	17793fa0148e476a8a35c0a1106499df.exe	94
PID 4680 wrote to memory of 1708	4680	17793fa0148e476a8a35c0a1106499df.exe	97
PID 4680 wrote to memory of 1708	4680	17793fa0148e476a8a35c0a1106499df.exe	97
PID 4680 wrote to memory of 1708	4680	17793fa0148e476a8a35c0a1106499df.exe	97
PID 4680 wrote to memory of 4924	4680	17793fa0148e476a8a35c0a1106499df.exe	100
PID 4680 wrote to memory of 4924	4680	17793fa0148e476a8a35c0a1106499df.exe	100
PID 4680 wrote to memory of 4924	4680	17793fa0148e476a8a35c0a1106499df.exe	100
PID 4680 wrote to memory of 1212	4680	17793fa0148e476a8a35c0a1106499df.exe	102
PID 4680 wrote to memory of 1212	4680	17793fa0148e476a8a35c0a1106499df.exe	102
PID 4680 wrote to memory of 1212	4680	17793fa0148e476a8a35c0a1106499df.exe	102
PID 2860 wrote to memory of 3872	2860	txiaelms.exe	108
PID 2860 wrote to memory of 3872	2860	txiaelms.exe	108
PID 2860 wrote to memory of 3872	2860	txiaelms.exe	108
PID 2860 wrote to memory of 3872	2860	txiaelms.exe	108
PID 2860 wrote to memory of 3872	2860	txiaelms.exe	108
PID 4680 wrote to memory of 1536	4680	17793fa0148e476a8a35c0a1106499df.exe	105
PID 4680 wrote to memory of 1536	4680	17793fa0148e476a8a35c0a1106499df.exe	105
PID 4680 wrote to memory of 1536	4680	17793fa0148e476a8a35c0a1106499df.exe	105

C:\Users\Admin\AppData\Local\Temp\17793fa0148e476a8a35c0a1106499df.exe
"C:\Users\Admin\AppData\Local\Temp\17793fa0148e476a8a35c0a1106499df.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4680
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pencfplk\
  2⤵
  PID:4684
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\txiaelms.exe" C:\Windows\SysWOW64\pencfplk\
  2⤵
  PID:1820
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create pencfplk binPath= "C:\Windows\SysWOW64\pencfplk\txiaelms.exe /d\"C:\Users\Admin\AppData\Local\Temp\17793fa0148e476a8a35c0a1106499df.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1708
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description pencfplk "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4924
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start pencfplk
  2⤵
  - Launches sc.exe
  PID:1212
- 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:1536
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4680 -s 1044
  2⤵
  - Program crash
  PID:3524

C:\Windows\SysWOW64\pencfplk\txiaelms.exe
C:\Windows\SysWOW64\pencfplk\txiaelms.exe /d"C:\Users\Admin\AppData\Local\Temp\17793fa0148e476a8a35c0a1106499df.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2860
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3872
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2860 -s 532
  2⤵
  - Program crash
  PID:3128

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2860 -ip 2860
1⤵
PID:2756

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 4680 -ip 4680
1⤵
PID:2864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

txiaelms.exe

Path C:\Users\Admin\AppData\Local\Temp\txiaelms.exe
Size 6.9MB
SHA256 d1cd97449161b322a24639d7d4b8adbd6f8ba564b9a1eb061bc4f1190cfa59d6
MD5 c62af91ad56eb84472c4556780dd4e31
SHA1 8787fcfde0f9f2cf373d3e65656027b4ee469b60
SHA512 9b1240e955fca908b1a89431e3e51277a9c417e0fb4d9b11bd66b7c00ae8ea6d13ef2f106a26959c1be1f66bfbb89a750d308a74ddc67a22b99a506e580efef5
SSDEEP 49152:u3Skkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk3:u3
MD5 SHA1 SHA512 SSDEEP

Submit Download

txiaelms.exe

Path C:\Windows\SysWOW64\pencfplk\txiaelms.exe
Size 1008KB
SHA256 369ebb3b6aa2e04285ff522e3a78cb319739506700fe278ee768432455db0c55
MD5 998c046cb040cc9e9141f85a13e94d6e
SHA1 c67bca182defa53990646aa979958cf89fdb3736
SHA512 276d9b589b51118018e9399f3ee23283a0de040390df42212dd382700d9bc1259012c57d85e005bf07cf1033aa6c5747ab309906f767843d72ede8e9d9b3d12e
SSDEEP 24576:unBykvO3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3k3:u3Skkkkkkkkkkkkkkkkkkkkkk
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/2860-9-0x0000000000EC0000-0x0000000000FC0000-memory.dmp

Download

memory/2860-10-0x0000000000E80000-0x0000000000E93000-memory.dmp

Download

memory/2860-17-0x0000000000400000-0x0000000000C14000-memory.dmp

Download

memory/2860-12-0x0000000000400000-0x0000000000C14000-memory.dmp

Download

memory/3872-16-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

Download

memory/3872-21-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

Download

memory/3872-20-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

Download

memory/3872-19-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

Download

memory/3872-13-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

Download

memory/4680-6-0x0000000000400000-0x0000000000C14000-memory.dmp

Download

memory/4680-11-0x0000000000EA0000-0x0000000000FA0000-memory.dmp

Download

memory/4680-18-0x0000000000400000-0x0000000000C14000-memory.dmp

Download

memory/4680-1-0x0000000000EA0000-0x0000000000FA0000-memory.dmp

Download

memory/4680-4-0x0000000000400000-0x0000000000C14000-memory.dmp

Download

memory/4680-2-0x0000000000CA0000-0x0000000000CB3000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads