tofsee | 7d3055e4e20d9b0232ca87992744baeefd6fe0522f8a1b35c82f930f4cd9d9b8

Analysis

max time kernel
160s
max time network
167s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
30/12/2023, 10:15

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
15955627bb0532349314f9dd256f5625.exe
Size 13.6MB
Sample231230-maf42sffar
SHA256 7d3055e4e20d9b0232ca87992744baeefd6fe0522f8a1b35c82f930f4cd9d9b8
MD5 15955627bb0532349314f9dd256f5625
SHA1 358a42d0eb46b601f5f6ccd4a53c1654402f706b
SHA512 8ff8c2df63cfed5f8da2c250dd4fc360b2ae5f1d7a5c2529bd83cc644e6a291d25bc8b2ee10f3d19c580495c016d7992ed12f98ac2d8d06686355bfd2f1b7c82
SSDEEP 24576:Nm1111111111111111111111111111111111111111111111111111111111111n:
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

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
1504	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\eipkymms\ImagePath = "C:\\Windows\\SysWOW64\\eipkymms\\pcyowdyi.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	15955627bb0532349314f9dd256f5625.exe

Deletes itself 1 IoCs

pid	Process
4172	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
1708	pcyowdyi.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1708 set thread context of 4172	1708	pcyowdyi.exe	110

Launches sc.exe 3 IoCs

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

pid	Process
3540	sc.exe
1580	sc.exe
4348	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
2944	3760	WerFault.exe	89
2124	1708	WerFault.exe	103

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 3760 wrote to memory of 536	3760	15955627bb0532349314f9dd256f5625.exe	93
PID 3760 wrote to memory of 536	3760	15955627bb0532349314f9dd256f5625.exe	93
PID 3760 wrote to memory of 536	3760	15955627bb0532349314f9dd256f5625.exe	93
PID 3760 wrote to memory of 1264	3760	15955627bb0532349314f9dd256f5625.exe	95
PID 3760 wrote to memory of 1264	3760	15955627bb0532349314f9dd256f5625.exe	95
PID 3760 wrote to memory of 1264	3760	15955627bb0532349314f9dd256f5625.exe	95
PID 3760 wrote to memory of 3540	3760	15955627bb0532349314f9dd256f5625.exe	97
PID 3760 wrote to memory of 3540	3760	15955627bb0532349314f9dd256f5625.exe	97
PID 3760 wrote to memory of 3540	3760	15955627bb0532349314f9dd256f5625.exe	97
PID 3760 wrote to memory of 1580	3760	15955627bb0532349314f9dd256f5625.exe	99
PID 3760 wrote to memory of 1580	3760	15955627bb0532349314f9dd256f5625.exe	99
PID 3760 wrote to memory of 1580	3760	15955627bb0532349314f9dd256f5625.exe	99
PID 3760 wrote to memory of 4348	3760	15955627bb0532349314f9dd256f5625.exe	101
PID 3760 wrote to memory of 4348	3760	15955627bb0532349314f9dd256f5625.exe	101
PID 3760 wrote to memory of 4348	3760	15955627bb0532349314f9dd256f5625.exe	101
PID 3760 wrote to memory of 1504	3760	15955627bb0532349314f9dd256f5625.exe	104
PID 3760 wrote to memory of 1504	3760	15955627bb0532349314f9dd256f5625.exe	104
PID 3760 wrote to memory of 1504	3760	15955627bb0532349314f9dd256f5625.exe	104
PID 1708 wrote to memory of 4172	1708	pcyowdyi.exe	110
PID 1708 wrote to memory of 4172	1708	pcyowdyi.exe	110
PID 1708 wrote to memory of 4172	1708	pcyowdyi.exe	110
PID 1708 wrote to memory of 4172	1708	pcyowdyi.exe	110
PID 1708 wrote to memory of 4172	1708	pcyowdyi.exe	110

C:\Users\Admin\AppData\Local\Temp\15955627bb0532349314f9dd256f5625.exe
"C:\Users\Admin\AppData\Local\Temp\15955627bb0532349314f9dd256f5625.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3760
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eipkymms\
  2⤵
  PID:536
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pcyowdyi.exe" C:\Windows\SysWOW64\eipkymms\
  2⤵
  PID:1264
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create eipkymms binPath= "C:\Windows\SysWOW64\eipkymms\pcyowdyi.exe /d\"C:\Users\Admin\AppData\Local\Temp\15955627bb0532349314f9dd256f5625.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:3540
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description eipkymms "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1580
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start eipkymms
  2⤵
  - Launches sc.exe
  PID:4348
- 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:1504
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 3760 -s 1240
  2⤵
  - Program crash
  PID:2944

C:\Windows\SysWOW64\eipkymms\pcyowdyi.exe
C:\Windows\SysWOW64\eipkymms\pcyowdyi.exe /d"C:\Users\Admin\AppData\Local\Temp\15955627bb0532349314f9dd256f5625.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:4172
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1708 -s 524
  2⤵
  - Program crash
  PID:2124

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3760 -ip 3760
1⤵
PID:4676

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1708 -ip 1708
1⤵
PID:2228

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

pcyowdyi.exe

Path C:\Users\Admin\AppData\Local\Temp\pcyowdyi.exe
Size 12.6MB
SHA256 2466ec3ad4e7d21c4c25b084c93c06652a546f08eaa5a8ff3561cdf791c25bf9
MD5 45bcebcec5e646ac835f3cbbf3887769
SHA1 9adff800e34af4649fb7c2a7d8eacc793ee69706
SHA512 bc688923a1f2ef172f1a99515f3805fe22aa158c510b3d9d6a64eb91fb37a1b5ad5d9d2cba99cadd3b5dea409c397aa146f92f79e0da0de39fbe7f1c91f556d4
SSDEEP 24576:tm1111111111111111111111111111111111111111111111111111111111111P:
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1708-17-0x0000000000400000-0x0000000002C6D000-memory.dmp

Download

memory/1708-18-0x0000000000400000-0x0000000002C6D000-memory.dmp

Download

memory/1708-12-0x0000000002CD0000-0x0000000002DD0000-memory.dmp

Download

memory/3760-10-0x00000000049C0000-0x00000000049D3000-memory.dmp

Download

memory/3760-9-0x0000000000400000-0x0000000002C6D000-memory.dmp

Download

memory/3760-1-0x0000000002F20000-0x0000000003020000-memory.dmp

Download

memory/3760-5-0x0000000000400000-0x0000000002C6D000-memory.dmp

Download

memory/3760-4-0x0000000000400000-0x0000000002C6D000-memory.dmp

Download

memory/3760-2-0x00000000049C0000-0x00000000049D3000-memory.dmp

Download

memory/4172-13-0x0000000000800000-0x0000000000815000-memory.dmp

Download

memory/4172-16-0x0000000000800000-0x0000000000815000-memory.dmp

Download

memory/4172-19-0x0000000000800000-0x0000000000815000-memory.dmp

Download

memory/4172-20-0x0000000000800000-0x0000000000815000-memory.dmp

Download

memory/4172-21-0x0000000000800000-0x0000000000815000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads