tofsee | a72fe0e974100d0d8d1bf79aed12e9ced6d30e1858d02d2cfa96346073de4555

Analysis

max time kernel
145s
max time network
145s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
18/01/2024, 16:17

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General

Target

6579b65897fd523a9df7f1f271b83937.exe
Size

12.9MB
MD5

6579b65897fd523a9df7f1f271b83937
SHA1

74efe89236c786277be4c231e3d0e31f37515cc9
SHA256

a72fe0e974100d0d8d1bf79aed12e9ced6d30e1858d02d2cfa96346073de4555
SHA512

479c3899f74cf5a7739532998edc1dddf274c74824f4ac4fa38a5b212700838ae0e2452ed17d1fc6bbc2ba274af9b1e45c142ca909f6078d3c52db2537e05396
SSDEEP

24576:KUqa71YB5DHlommmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmn:KF15

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

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\vnrrfdxs = "0"	svchost.exe

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
2664	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\vnrrfdxs\ImagePath = "C:\\Windows\\SysWOW64\\vnrrfdxs\\fowunpss.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2116	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2712	fowunpss.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2712 set thread context of 2116	2712	fowunpss.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2788	sc.exe
2644	sc.exe
2640	sc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2060 wrote to memory of 1580	2060	6579b65897fd523a9df7f1f271b83937.exe	29
PID 2060 wrote to memory of 1580	2060	6579b65897fd523a9df7f1f271b83937.exe	29
PID 2060 wrote to memory of 1580	2060	6579b65897fd523a9df7f1f271b83937.exe	29
PID 2060 wrote to memory of 1580	2060	6579b65897fd523a9df7f1f271b83937.exe	29
PID 2060 wrote to memory of 3060	2060	6579b65897fd523a9df7f1f271b83937.exe	30
PID 2060 wrote to memory of 3060	2060	6579b65897fd523a9df7f1f271b83937.exe	30
PID 2060 wrote to memory of 3060	2060	6579b65897fd523a9df7f1f271b83937.exe	30
PID 2060 wrote to memory of 3060	2060	6579b65897fd523a9df7f1f271b83937.exe	30
PID 2060 wrote to memory of 2788	2060	6579b65897fd523a9df7f1f271b83937.exe	32
PID 2060 wrote to memory of 2788	2060	6579b65897fd523a9df7f1f271b83937.exe	32
PID 2060 wrote to memory of 2788	2060	6579b65897fd523a9df7f1f271b83937.exe	32
PID 2060 wrote to memory of 2788	2060	6579b65897fd523a9df7f1f271b83937.exe	32
PID 2060 wrote to memory of 2644	2060	6579b65897fd523a9df7f1f271b83937.exe	35
PID 2060 wrote to memory of 2644	2060	6579b65897fd523a9df7f1f271b83937.exe	35
PID 2060 wrote to memory of 2644	2060	6579b65897fd523a9df7f1f271b83937.exe	35
PID 2060 wrote to memory of 2644	2060	6579b65897fd523a9df7f1f271b83937.exe	35
PID 2060 wrote to memory of 2640	2060	6579b65897fd523a9df7f1f271b83937.exe	36
PID 2060 wrote to memory of 2640	2060	6579b65897fd523a9df7f1f271b83937.exe	36
PID 2060 wrote to memory of 2640	2060	6579b65897fd523a9df7f1f271b83937.exe	36
PID 2060 wrote to memory of 2640	2060	6579b65897fd523a9df7f1f271b83937.exe	36
PID 2060 wrote to memory of 2664	2060	6579b65897fd523a9df7f1f271b83937.exe	39
PID 2060 wrote to memory of 2664	2060	6579b65897fd523a9df7f1f271b83937.exe	39
PID 2060 wrote to memory of 2664	2060	6579b65897fd523a9df7f1f271b83937.exe	39
PID 2060 wrote to memory of 2664	2060	6579b65897fd523a9df7f1f271b83937.exe	39
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41
PID 2712 wrote to memory of 2116	2712	fowunpss.exe	41

C:\Users\Admin\AppData\Local\Temp\6579b65897fd523a9df7f1f271b83937.exe
"C:\Users\Admin\AppData\Local\Temp\6579b65897fd523a9df7f1f271b83937.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2060
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vnrrfdxs\
  2⤵
  PID:1580
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fowunpss.exe" C:\Windows\SysWOW64\vnrrfdxs\
  2⤵
  PID:3060
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create vnrrfdxs binPath= "C:\Windows\SysWOW64\vnrrfdxs\fowunpss.exe /d\"C:\Users\Admin\AppData\Local\Temp\6579b65897fd523a9df7f1f271b83937.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2788
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description vnrrfdxs "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2644
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start vnrrfdxs
  2⤵
  - Launches sc.exe
  PID:2640
- 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:2664

C:\Windows\SysWOW64\vnrrfdxs\fowunpss.exe
C:\Windows\SysWOW64\vnrrfdxs\fowunpss.exe /d"C:\Users\Admin\AppData\Local\Temp\6579b65897fd523a9df7f1f271b83937.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2712
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2116

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

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
888KB

MD5
e57552971719669b11d705fc42769b1a

SHA1
6cccc2cdc259dd1e9dd4003c44a3a0871707b60f

SHA256
67b567d15197cc5b92c42098e09c5a1f0ea3b870c583396b9f1d58abaca8290f

SHA512
01873630f0ada8d828dcd06d9183ce60daa01d0d86b8cde54d790f00cc97547c0c437dd0cfdd748a523d345b758734cf836cccd5c8b7fd89d47ec3074a1a4ad0

Download Submit
C:\Windows\SysWOW64\vnrrfdxs\fowunpss.exe

Filesize
1.2MB

MD5
a1678622a2473a41ea78de54f1ecc028

SHA1
560b779d43dae273070019155df12117910613a9

SHA256
764266700b960b1676ecb9c492afbb10f0bde7699d39e0d14787f2d0176c4c1e

SHA512
6f0e321aacb8ee312b77d9fc62e79ced41a4895e664b5cfca2c8c9a911bf2399b16641bcf532e0db9503b912b3f7797d3a2286b96f35db28c18c09c073233711

Download Submit
memory/2060-3-0x0000000000240000-0x0000000000253000-memory.dmp

Filesize
76KB

Download
memory/2060-1-0x0000000000620000-0x0000000000720000-memory.dmp

Filesize
1024KB

Download
memory/2060-4-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2060-8-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2116-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2116-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2116-14-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2116-9-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2116-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2116-18-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2116-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2712-10-0x0000000000590000-0x0000000000690000-memory.dmp

Filesize
1024KB

Download
memory/2712-15-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download
memory/2712-12-0x0000000000400000-0x0000000000468000-memory.dmp

Filesize
416KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads