tofsee | 02447f8d1ef4148ef09948fe2bdd57ed15e3b4f6fd86db9c4ef81004a43a0d6d

General

Target

1a6060726c5693529f35ca4c0a90637e.exe
Size

11.8MB
MD5

1a6060726c5693529f35ca4c0a90637e
SHA1

34d52fd089ae855f763caef6eb2a5a3e24092b0e
SHA256

02447f8d1ef4148ef09948fe2bdd57ed15e3b4f6fd86db9c4ef81004a43a0d6d
SHA512

d49ba36c91421a48f817a3704f2df101e8d646e981025425b776050fa4f9d7d42822ad3e5c3d5ebb701f3dd4a26f3cd78993f6840826484887400c4847449698
SSDEEP

6144:0KTDS3aiZOTXbKdags2FNxWUWF5zoINm/nu:hMaiZOT+dags21Wts9vu

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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
4556	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\wtnyauer\ImagePath = "C:\\Windows\\SysWOW64\\wtnyauer\\bkwcmhdt.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-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	1a6060726c5693529f35ca4c0a90637e.exe

Executes dropped EXE 1 IoCs

pid	Process
1504	bkwcmhdt.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1504 set thread context of 1736	1504	bkwcmhdt.exe	110

Launches sc.exe 3 IoCs

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

pid	Process
4688	sc.exe
2332	sc.exe
4700	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
2688	1504	WerFault.exe	108
3456	2496	WerFault.exe	90

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2496 wrote to memory of 4404	2496	1a6060726c5693529f35ca4c0a90637e.exe	96
PID 2496 wrote to memory of 4404	2496	1a6060726c5693529f35ca4c0a90637e.exe	96
PID 2496 wrote to memory of 4404	2496	1a6060726c5693529f35ca4c0a90637e.exe	96
PID 2496 wrote to memory of 4520	2496	1a6060726c5693529f35ca4c0a90637e.exe	97
PID 2496 wrote to memory of 4520	2496	1a6060726c5693529f35ca4c0a90637e.exe	97
PID 2496 wrote to memory of 4520	2496	1a6060726c5693529f35ca4c0a90637e.exe	97
PID 2496 wrote to memory of 2332	2496	1a6060726c5693529f35ca4c0a90637e.exe	100
PID 2496 wrote to memory of 2332	2496	1a6060726c5693529f35ca4c0a90637e.exe	100
PID 2496 wrote to memory of 2332	2496	1a6060726c5693529f35ca4c0a90637e.exe	100
PID 2496 wrote to memory of 4700	2496	1a6060726c5693529f35ca4c0a90637e.exe	102
PID 2496 wrote to memory of 4700	2496	1a6060726c5693529f35ca4c0a90637e.exe	102
PID 2496 wrote to memory of 4700	2496	1a6060726c5693529f35ca4c0a90637e.exe	102
PID 2496 wrote to memory of 4688	2496	1a6060726c5693529f35ca4c0a90637e.exe	104
PID 2496 wrote to memory of 4688	2496	1a6060726c5693529f35ca4c0a90637e.exe	104
PID 2496 wrote to memory of 4688	2496	1a6060726c5693529f35ca4c0a90637e.exe	104
PID 2496 wrote to memory of 4556	2496	1a6060726c5693529f35ca4c0a90637e.exe	106
PID 2496 wrote to memory of 4556	2496	1a6060726c5693529f35ca4c0a90637e.exe	106
PID 2496 wrote to memory of 4556	2496	1a6060726c5693529f35ca4c0a90637e.exe	106
PID 1504 wrote to memory of 1736	1504	bkwcmhdt.exe	110
PID 1504 wrote to memory of 1736	1504	bkwcmhdt.exe	110
PID 1504 wrote to memory of 1736	1504	bkwcmhdt.exe	110
PID 1504 wrote to memory of 1736	1504	bkwcmhdt.exe	110
PID 1504 wrote to memory of 1736	1504	bkwcmhdt.exe	110

C:\Users\Admin\AppData\Local\Temp\1a6060726c5693529f35ca4c0a90637e.exe
"C:\Users\Admin\AppData\Local\Temp\1a6060726c5693529f35ca4c0a90637e.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2496
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wtnyauer\
  2⤵
  PID:4404
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bkwcmhdt.exe" C:\Windows\SysWOW64\wtnyauer\
  2⤵
  PID:4520
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create wtnyauer binPath= "C:\Windows\SysWOW64\wtnyauer\bkwcmhdt.exe /d\"C:\Users\Admin\AppData\Local\Temp\1a6060726c5693529f35ca4c0a90637e.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2332
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description wtnyauer "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4700
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start wtnyauer
  2⤵
  - Launches sc.exe
  PID:4688
- 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:4556
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2496 -s 1172
  2⤵
  - Program crash
  PID:3456

C:\Windows\SysWOW64\wtnyauer\bkwcmhdt.exe
C:\Windows\SysWOW64\wtnyauer\bkwcmhdt.exe /d"C:\Users\Admin\AppData\Local\Temp\1a6060726c5693529f35ca4c0a90637e.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1504
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  PID:1736
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1504 -s 536
  2⤵
  - Program crash
  PID:2688

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2496 -ip 2496
1⤵
PID:2868

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 1504 -ip 1504
1⤵
PID:3980

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

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

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

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
11.7MB

MD5
a88dd7cf0b6e3cc6a2639c8023c81bb3

SHA1
cb086f1c1762aba5e9c5903c6cfdc6305d1f262d

SHA256
aeb6604197ec9bf77a70140233882395f9485e37c71040909cc27e77f68fd72e

SHA512
e1d45805eba4919c535e61a68bdba2529db23fc03596c59484062e2048462fb327cd716410deb32dd7fa20300987ae946471f7aee2de017f22a9a2db6e87cb68

Download Submit
C:\Windows\SysWOW64\wtnyauer\bkwcmhdt.exe

Filesize
8.2MB

MD5
c3919dd52e24add4836e266b405ea7af

SHA1
9410b77addc6827cc011f4929a573d6de3576854

SHA256
05446b076a1d2bcb2f99283596e86520883f3277278ed8f2f08d3bc4627188aa

SHA512
5ffc2ce203de28040df009b5c9206b59c22b4f4738deb34be2f87e9a4e9283497fc85713a4fc290404e804c4af89b5721c4bffddb2c50b3afb01c864c98b4f30

Download Submit
memory/1504-21-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/1504-18-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/1504-14-0x00000000034F0000-0x00000000035F0000-memory.dmp

Filesize
1024KB

Download
memory/1736-15-0x00000000003B0000-0x00000000003C5000-memory.dmp

Filesize
84KB

Download
memory/1736-26-0x00000000003B0000-0x00000000003C5000-memory.dmp

Filesize
84KB

Download
memory/1736-25-0x00000000003B0000-0x00000000003C5000-memory.dmp

Filesize
84KB

Download
memory/1736-22-0x00000000003B0000-0x00000000003C5000-memory.dmp

Filesize
84KB

Download
memory/1736-19-0x00000000003B0000-0x00000000003C5000-memory.dmp

Filesize
84KB

Download
memory/2496-8-0x00000000033B0000-0x00000000034B0000-memory.dmp

Filesize
1024KB

Download
memory/2496-11-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/2496-10-0x0000000004F90000-0x0000000004FA3000-memory.dmp

Filesize
76KB

Download
memory/2496-1-0x00000000033B0000-0x00000000034B0000-memory.dmp

Filesize
1024KB

Download
memory/2496-5-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/2496-4-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/2496-2-0x0000000004F90000-0x0000000004FA3000-memory.dmp

Filesize
76KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads