tofsee | 00a414b5c275653c18a3cc06ae1d1d9de9e07144f0a6091fa46f51e482a0dae6

General

Target

1796279f87df5f4d66030525b7e8e39c.exe
Size

13.8MB
MD5

1796279f87df5f4d66030525b7e8e39c
SHA1

a45b65e9060ca0d28fd2875b22b8540067db6832
SHA256

00a414b5c275653c18a3cc06ae1d1d9de9e07144f0a6091fa46f51e482a0dae6
SHA512

8b381fd38d8a538a408a29c70d2532403e36caadae46bf20b2f1786cbe1942c67ca310a4faab777b5c576062cd2ecf57c4edac5526cbf96a6e6dd413f2950b06
SSDEEP

3072:8kAgDr/XSqon0LUwWQ2UHxqms7/7btm52yls2LC5J8ZWwoQSwgeb7hiOiPg0tGif:8khDr/+0LUdbKhsMs268UoSwrb7SpG

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
4552	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\nezolfwl\ImagePath = "C:\\Windows\\SysWOW64\\nezolfwl\\zzwrulcu.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	1796279f87df5f4d66030525b7e8e39c.exe

Deletes itself 1 IoCs

pid	Process
4700	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4404	zzwrulcu.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4404 set thread context of 4700	4404	zzwrulcu.exe	110

Launches sc.exe 3 IoCs

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

pid	Process
4488	sc.exe
2640	sc.exe
5088	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
3048	4720	WerFault.exe	90
4140	4404	WerFault.exe	108

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4720 wrote to memory of 2936	4720	1796279f87df5f4d66030525b7e8e39c.exe	95
PID 4720 wrote to memory of 2936	4720	1796279f87df5f4d66030525b7e8e39c.exe	95
PID 4720 wrote to memory of 2936	4720	1796279f87df5f4d66030525b7e8e39c.exe	95
PID 4720 wrote to memory of 1932	4720	1796279f87df5f4d66030525b7e8e39c.exe	97
PID 4720 wrote to memory of 1932	4720	1796279f87df5f4d66030525b7e8e39c.exe	97
PID 4720 wrote to memory of 1932	4720	1796279f87df5f4d66030525b7e8e39c.exe	97
PID 4720 wrote to memory of 2640	4720	1796279f87df5f4d66030525b7e8e39c.exe	99
PID 4720 wrote to memory of 2640	4720	1796279f87df5f4d66030525b7e8e39c.exe	99
PID 4720 wrote to memory of 2640	4720	1796279f87df5f4d66030525b7e8e39c.exe	99
PID 4720 wrote to memory of 5088	4720	1796279f87df5f4d66030525b7e8e39c.exe	101
PID 4720 wrote to memory of 5088	4720	1796279f87df5f4d66030525b7e8e39c.exe	101
PID 4720 wrote to memory of 5088	4720	1796279f87df5f4d66030525b7e8e39c.exe	101
PID 4720 wrote to memory of 4488	4720	1796279f87df5f4d66030525b7e8e39c.exe	103
PID 4720 wrote to memory of 4488	4720	1796279f87df5f4d66030525b7e8e39c.exe	103
PID 4720 wrote to memory of 4488	4720	1796279f87df5f4d66030525b7e8e39c.exe	103
PID 4720 wrote to memory of 4552	4720	1796279f87df5f4d66030525b7e8e39c.exe	105
PID 4720 wrote to memory of 4552	4720	1796279f87df5f4d66030525b7e8e39c.exe	105
PID 4720 wrote to memory of 4552	4720	1796279f87df5f4d66030525b7e8e39c.exe	105
PID 4404 wrote to memory of 4700	4404	zzwrulcu.exe	110
PID 4404 wrote to memory of 4700	4404	zzwrulcu.exe	110
PID 4404 wrote to memory of 4700	4404	zzwrulcu.exe	110
PID 4404 wrote to memory of 4700	4404	zzwrulcu.exe	110
PID 4404 wrote to memory of 4700	4404	zzwrulcu.exe	110

C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe
"C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4720
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nezolfwl\
  2⤵
  PID:2936
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zzwrulcu.exe" C:\Windows\SysWOW64\nezolfwl\
  2⤵
  PID:1932
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create nezolfwl binPath= "C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe /d\"C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2640
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description nezolfwl "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:5088
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start nezolfwl
  2⤵
  - Launches sc.exe
  PID:4488
- 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:4552
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4720 -s 788
  2⤵
  - Program crash
  PID:3048

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4720 -ip 4720
1⤵
PID:1636

C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe
C:\Windows\SysWOW64\nezolfwl\zzwrulcu.exe /d"C:\Users\Admin\AppData\Local\Temp\1796279f87df5f4d66030525b7e8e39c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4404
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4700
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 524
  2⤵
  - Program crash
  PID:4140

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4404 -ip 4404
1⤵
PID:752

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
10.0MB

MD5
a3c8e29623ba0dac25812f64483836ab

SHA1
1ccf199642f399bc8090c803586b1c2273a1d9f3

SHA256
3b94146017099c425daaf5c2e6ee748fe58d41c36f078b72920a0f8d85a642d3

SHA512
12bb5f87bb99f64d34fecee90d3f873d0c51b2dd8cb67fc9b0ef7152e1110b367de4d7601dd6bbd485036be05d3f1b10356eb4f3cfe8654654a8c80857078239

Download Submit
memory/4404-14-0x0000000003250000-0x0000000003350000-memory.dmp

Filesize
1024KB

Download
memory/4404-18-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/4404-20-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/4700-23-0x00000000005B0000-0x00000000005C5000-memory.dmp

Filesize
84KB

Download
memory/4700-22-0x00000000005B0000-0x00000000005C5000-memory.dmp

Filesize
84KB

Download
memory/4700-15-0x00000000005B0000-0x00000000005C5000-memory.dmp

Filesize
84KB

Download
memory/4700-21-0x00000000005B0000-0x00000000005C5000-memory.dmp

Filesize
84KB

Download
memory/4700-19-0x00000000005B0000-0x00000000005C5000-memory.dmp

Filesize
84KB

Download
memory/4720-10-0x00000000033A0000-0x00000000034A0000-memory.dmp

Filesize
1024KB

Download
memory/4720-12-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/4720-1-0x00000000033A0000-0x00000000034A0000-memory.dmp

Filesize
1024KB

Download
memory/4720-3-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download
memory/4720-13-0x0000000004E50000-0x0000000004E63000-memory.dmp

Filesize
76KB

Download
memory/4720-2-0x0000000004E50000-0x0000000004E63000-memory.dmp

Filesize
76KB

Download
memory/4720-5-0x0000000000400000-0x000000000324F000-memory.dmp

Filesize
46.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads