tofsee | 34228f82027ebdc82c56ab79ef9be354c2d0f8931a3947a6e57ad0561d1b1ec8

General

Target

12942113a6462b87cf3bfc52161dc9f8.exe
Size

14.6MB
MD5

12942113a6462b87cf3bfc52161dc9f8
SHA1

a17a7eedeb13de9055b8a8ea2b3a2aa3d676a4b6
SHA256

34228f82027ebdc82c56ab79ef9be354c2d0f8931a3947a6e57ad0561d1b1ec8
SHA512

fb39b0584c50c3f56e2f41f720928aaec9a8fd8ed2adb3e27d2cd42ec69dc3c887a0c0abcfdc457c42b768062a4327054e0acd9be8b6a2f89b36765d7bc417fe
SSDEEP

6144:MHCbMTTkphQW/uoIuOB9u9dwEImeaDdYft:RbMnkpKW8uko9Cm2f

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
4520	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\hhycxxs\ImagePath = "C:\\Windows\\SysWOW64\\hhycxxs\\oohugdce.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	12942113a6462b87cf3bfc52161dc9f8.exe

Deletes itself 1 IoCs

pid	Process
3316	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2432	oohugdce.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2432 set thread context of 3316	2432	oohugdce.exe	109

Launches sc.exe 3 IoCs

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

pid	Process
4804	sc.exe
1688	sc.exe
3632	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
3676	1368	WerFault.exe	88
2700	2432	WerFault.exe	103

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1368 wrote to memory of 3652	1368	12942113a6462b87cf3bfc52161dc9f8.exe	93
PID 1368 wrote to memory of 3652	1368	12942113a6462b87cf3bfc52161dc9f8.exe	93
PID 1368 wrote to memory of 3652	1368	12942113a6462b87cf3bfc52161dc9f8.exe	93
PID 1368 wrote to memory of 2472	1368	12942113a6462b87cf3bfc52161dc9f8.exe	95
PID 1368 wrote to memory of 2472	1368	12942113a6462b87cf3bfc52161dc9f8.exe	95
PID 1368 wrote to memory of 2472	1368	12942113a6462b87cf3bfc52161dc9f8.exe	95
PID 1368 wrote to memory of 4804	1368	12942113a6462b87cf3bfc52161dc9f8.exe	97
PID 1368 wrote to memory of 4804	1368	12942113a6462b87cf3bfc52161dc9f8.exe	97
PID 1368 wrote to memory of 4804	1368	12942113a6462b87cf3bfc52161dc9f8.exe	97
PID 1368 wrote to memory of 1688	1368	12942113a6462b87cf3bfc52161dc9f8.exe	99
PID 1368 wrote to memory of 1688	1368	12942113a6462b87cf3bfc52161dc9f8.exe	99
PID 1368 wrote to memory of 1688	1368	12942113a6462b87cf3bfc52161dc9f8.exe	99
PID 1368 wrote to memory of 3632	1368	12942113a6462b87cf3bfc52161dc9f8.exe	101
PID 1368 wrote to memory of 3632	1368	12942113a6462b87cf3bfc52161dc9f8.exe	101
PID 1368 wrote to memory of 3632	1368	12942113a6462b87cf3bfc52161dc9f8.exe	101
PID 1368 wrote to memory of 4520	1368	12942113a6462b87cf3bfc52161dc9f8.exe	106
PID 1368 wrote to memory of 4520	1368	12942113a6462b87cf3bfc52161dc9f8.exe	106
PID 1368 wrote to memory of 4520	1368	12942113a6462b87cf3bfc52161dc9f8.exe	106
PID 2432 wrote to memory of 3316	2432	oohugdce.exe	109
PID 2432 wrote to memory of 3316	2432	oohugdce.exe	109
PID 2432 wrote to memory of 3316	2432	oohugdce.exe	109
PID 2432 wrote to memory of 3316	2432	oohugdce.exe	109
PID 2432 wrote to memory of 3316	2432	oohugdce.exe	109

C:\Users\Admin\AppData\Local\Temp\12942113a6462b87cf3bfc52161dc9f8.exe
"C:\Users\Admin\AppData\Local\Temp\12942113a6462b87cf3bfc52161dc9f8.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1368
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hhycxxs\
  2⤵
  PID:3652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oohugdce.exe" C:\Windows\SysWOW64\hhycxxs\
  2⤵
  PID:2472
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create hhycxxs binPath= "C:\Windows\SysWOW64\hhycxxs\oohugdce.exe /d\"C:\Users\Admin\AppData\Local\Temp\12942113a6462b87cf3bfc52161dc9f8.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4804
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description hhycxxs "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1688
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start hhycxxs
  2⤵
  - Launches sc.exe
  PID:3632
- 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:4520
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1368 -s 1244
  2⤵
  - Program crash
  PID:3676

C:\Windows\SysWOW64\hhycxxs\oohugdce.exe
C:\Windows\SysWOW64\hhycxxs\oohugdce.exe /d"C:\Users\Admin\AppData\Local\Temp\12942113a6462b87cf3bfc52161dc9f8.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2432
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:3316
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 2432 -s 508
  2⤵
  - Program crash
  PID:2700

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1368 -ip 1368
1⤵
PID:1936

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 2432 -ip 2432
1⤵
PID:1452

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\oohugdce.exe

Filesize
2.1MB

MD5
d2398dfa05e0a42b0a035c3da0bb5a27

SHA1
c960d6a66d1e360dc47fee4e13941c48bf8bc870

SHA256
2ee3c3c94c0a1400f115e3af9793603b8547bdeb9be2cc2c335368f72cabb134

SHA512
ff25876468bf92a0ffa70bb45562a1feb0cd0a08d9607313cf78562975d19a01c550bf5c6a7a3e27e0b382f1bb77498bea6e9ce07ec1e00d23451a7ca11c71f6

Download Submit
C:\Windows\SysWOW64\hhycxxs\oohugdce.exe

Filesize
1.9MB

MD5
84cf024d44c6593caabde5b25dd2e818

SHA1
ba1ac9cb3365900e554b0a41f54944fe931879f5

SHA256
fc1415742d5fbbc104b02fc25e8a860d8d0c46dcaebcf3d41cc63950fec8f79e

SHA512
d26b2dc290398a0a0fae350321d38c2032e6404fa1335f30f949fe3ccfdd850a7250e28560a1684de18d591e0d1b9b4aa818de7bba08f496112d91564c8f7d15

Download Submit
memory/1368-9-0x0000000000600000-0x0000000000613000-memory.dmp

Filesize
76KB

Download
memory/1368-3-0x0000000000400000-0x0000000000455000-memory.dmp

Filesize
340KB

Download
memory/1368-2-0x0000000000600000-0x0000000000613000-memory.dmp

Filesize
76KB

Download
memory/1368-8-0x0000000000400000-0x0000000000455000-memory.dmp

Filesize
340KB

Download
memory/1368-1-0x0000000000630000-0x0000000000730000-memory.dmp

Filesize
1024KB

Download
memory/2432-10-0x0000000000600000-0x0000000000700000-memory.dmp

Filesize
1024KB

Download
memory/2432-11-0x0000000000400000-0x0000000000455000-memory.dmp

Filesize
340KB

Download
memory/2432-17-0x0000000000400000-0x0000000000455000-memory.dmp

Filesize
340KB

Download
memory/3316-16-0x0000000000D60000-0x0000000000D75000-memory.dmp

Filesize
84KB

Download
memory/3316-15-0x0000000000D60000-0x0000000000D75000-memory.dmp

Filesize
84KB

Download
memory/3316-12-0x0000000000D60000-0x0000000000D75000-memory.dmp

Filesize
84KB

Download
memory/3316-18-0x0000000000D60000-0x0000000000D75000-memory.dmp

Filesize
84KB

Download
memory/3316-19-0x0000000000D60000-0x0000000000D75000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads