tofsee | 8dd3ef051e815d7e2e7bd153477614356dac6f34f6510a06e5a19a4f84a0fb9e

General

Target

7d622157c4c9861a2bb4a1c5ffd85106.exe
Size

12.5MB
MD5

7d622157c4c9861a2bb4a1c5ffd85106
SHA1

8950e8c7908624eecf9c59f978446f1cafa2fded
SHA256

8dd3ef051e815d7e2e7bd153477614356dac6f34f6510a06e5a19a4f84a0fb9e
SHA512

38d6ba9613e13f07e91db844d856fc87da698dadacc0086a0b63e2ad365292fbbbad571099d0c70ce73f682df8fc46e1a33a5614d8010a400d4d2af05f2c8db7
SSDEEP

49152:BaBVqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqm:4

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 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2200	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\cqgwrkja\ImagePath = "C:\\Windows\\SysWOW64\\cqgwrkja\\vvsnqhyq.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-1-5-21-635608581-3370340891-292606865-1000\Control Panel\International\Geo\Nation	7d622157c4c9861a2bb4a1c5ffd85106.exe

Deletes itself 1 IoCs

pid	Process
3004	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3756	vvsnqhyq.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3756 set thread context of 3004	3756	vvsnqhyq.exe	105

Launches sc.exe 3 IoCs

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

pid	Process
2632	sc.exe
2500	sc.exe
3480	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
2412	1028	WerFault.exe	83
2552	3756	WerFault.exe	98

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1028 wrote to memory of 4216	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	84
PID 1028 wrote to memory of 4216	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	84
PID 1028 wrote to memory of 4216	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	84
PID 1028 wrote to memory of 1484	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	86
PID 1028 wrote to memory of 1484	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	86
PID 1028 wrote to memory of 1484	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	86
PID 1028 wrote to memory of 2632	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	91
PID 1028 wrote to memory of 2632	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	91
PID 1028 wrote to memory of 2632	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	91
PID 1028 wrote to memory of 2500	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	94
PID 1028 wrote to memory of 2500	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	94
PID 1028 wrote to memory of 2500	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	94
PID 1028 wrote to memory of 3480	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	96
PID 1028 wrote to memory of 3480	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	96
PID 1028 wrote to memory of 3480	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	96
PID 1028 wrote to memory of 2200	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	100
PID 1028 wrote to memory of 2200	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	100
PID 1028 wrote to memory of 2200	1028	7d622157c4c9861a2bb4a1c5ffd85106.exe	100
PID 3756 wrote to memory of 3004	3756	vvsnqhyq.exe	105
PID 3756 wrote to memory of 3004	3756	vvsnqhyq.exe	105
PID 3756 wrote to memory of 3004	3756	vvsnqhyq.exe	105
PID 3756 wrote to memory of 3004	3756	vvsnqhyq.exe	105
PID 3756 wrote to memory of 3004	3756	vvsnqhyq.exe	105

C:\Users\Admin\AppData\Local\Temp\7d622157c4c9861a2bb4a1c5ffd85106.exe
"C:\Users\Admin\AppData\Local\Temp\7d622157c4c9861a2bb4a1c5ffd85106.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cqgwrkja\
  2⤵
  PID:4216
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vvsnqhyq.exe" C:\Windows\SysWOW64\cqgwrkja\
  2⤵
  PID:1484
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create cqgwrkja binPath= "C:\Windows\SysWOW64\cqgwrkja\vvsnqhyq.exe /d\"C:\Users\Admin\AppData\Local\Temp\7d622157c4c9861a2bb4a1c5ffd85106.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2632
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description cqgwrkja "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2500
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start cqgwrkja
  2⤵
  - Launches sc.exe
  PID:3480
- 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:2200
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1028 -s 792
  2⤵
  - Program crash
  PID:2412

C:\Windows\SysWOW64\cqgwrkja\vvsnqhyq.exe
C:\Windows\SysWOW64\cqgwrkja\vvsnqhyq.exe /d"C:\Users\Admin\AppData\Local\Temp\7d622157c4c9861a2bb4a1c5ffd85106.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3756
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3004
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3756 -s 556
  2⤵
  - Program crash
  PID:2552

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1028 -ip 1028
1⤵
PID:4604

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 3756 -ip 3756
1⤵
PID:4368

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

Impair Defenses

1

T1562

Disable or Modify System Firewall

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
13.4MB

MD5
cc1d1153f6fefc2bd04e759cbf6d58e2

SHA1
dd2aee1f7973146d57853e03e7708848f1fc2785

SHA256
e3430b0aedc2ae6686bec1e427e2202b56e6abe24971e2d340ffe99134c45ad9

SHA512
8f90236a590f322d7905c7ccbb38df027238886c47196afe511591425e735a72cdfa8dbfbaa5b9b1800e78282a1a8cadcfad77a958fe57008ffccf58c7c668a0

Download Submit
C:\Windows\SysWOW64\cqgwrkja\vvsnqhyq.exe

Filesize
6.1MB

MD5
cab15c9efaa0afcf5a9b314ec480370a

SHA1
e8b4f15721d8d3e2fa21c552f8672f7408cb1552

SHA256
d93c7308803597b89f463a02d6e61f23f285a17643278ff908d3ac6c5d9cb2e5

SHA512
0f5058482b85948035553774a8b70f137c7ceda9e1883df0ce50761743fd0c2264aa49fe43e29c47db75669dee72fb60ca9a986aefe9752a8407ed523ee911a5

Download Submit
memory/1028-5-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/1028-6-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/1028-3-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/1028-2-0x0000000004A00000-0x0000000004A13000-memory.dmp

Filesize
76KB

Download
memory/1028-10-0x0000000002E20000-0x0000000002F20000-memory.dmp

Filesize
1024KB

Download
memory/1028-1-0x0000000002E20000-0x0000000002F20000-memory.dmp

Filesize
1024KB

Download
memory/1028-16-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/3004-20-0x0000000000150000-0x0000000000165000-memory.dmp

Filesize
84KB

Download
memory/3004-12-0x0000000000150000-0x0000000000165000-memory.dmp

Filesize
84KB

Download
memory/3004-22-0x0000000000150000-0x0000000000165000-memory.dmp

Filesize
84KB

Download
memory/3004-21-0x0000000000150000-0x0000000000165000-memory.dmp

Filesize
84KB

Download
memory/3004-19-0x0000000000150000-0x0000000000165000-memory.dmp

Filesize
84KB

Download
memory/3756-13-0x0000000002EF0000-0x0000000002F03000-memory.dmp

Filesize
76KB

Download
memory/3756-18-0x0000000000400000-0x0000000002CC0000-memory.dmp

Filesize
40.8MB

Download
memory/3756-11-0x0000000002F60000-0x0000000003060000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads