tofsee | 4cdabd75e610ba709a80cdf6ae7e4b7e170e0522e1c8b32066ac8e917697c128

Analysis

max time kernel
144s
max time network
128s
platform
windows7_x64
resource
win7-20240319-en
resource tags

arch:x64arch:x86image:win7-20240319-enlocale:en-usos:windows7-x64system
submitted
27/03/2024, 03:34

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General

Target
e0a9ef38f65d7d2f909db84733c0e66c.exe
Size 13.8MB
Sample240327-d43qgaeg21
SHA256 4cdabd75e610ba709a80cdf6ae7e4b7e170e0522e1c8b32066ac8e917697c128
MD5 e0a9ef38f65d7d2f909db84733c0e66c
SHA1 66bbd23caa023a99c3c0b44dd1af1d03a919ca54
SHA512 2be8f23e7a6f9dbd176174a56111b46113d29ae4ed9f8c746440f468644b9d45718ed0263f2b16896a8a7b458daf1ec0323f63100f4d4c05c3c8b7a9adb5a90d
SSDEEP 49152:q66666666666666666666666666666666666666666666666666666666666666j:
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.6
lazystax.ru

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\yoivqmku = "0"	svchost.exe

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
2592	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\yoivqmku\ImagePath = "C:\\Windows\\SysWOW64\\yoivqmku\\bquyobss.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2432	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2752	bquyobss.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2752 set thread context of 2432	2752	bquyobss.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2720	sc.exe
1420	sc.exe
2572	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 1708 wrote to memory of 2604	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	28
PID 1708 wrote to memory of 2604	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	28
PID 1708 wrote to memory of 2604	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	28
PID 1708 wrote to memory of 2604	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	28
PID 1708 wrote to memory of 2556	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	30
PID 1708 wrote to memory of 2556	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	30
PID 1708 wrote to memory of 2556	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	30
PID 1708 wrote to memory of 2556	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	30
PID 1708 wrote to memory of 2720	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	32
PID 1708 wrote to memory of 2720	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	32
PID 1708 wrote to memory of 2720	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	32
PID 1708 wrote to memory of 2720	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	32
PID 1708 wrote to memory of 1420	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	34
PID 1708 wrote to memory of 1420	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	34
PID 1708 wrote to memory of 1420	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	34
PID 1708 wrote to memory of 1420	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	34
PID 1708 wrote to memory of 2572	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	36
PID 1708 wrote to memory of 2572	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	36
PID 1708 wrote to memory of 2572	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	36
PID 1708 wrote to memory of 2572	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	36
PID 1708 wrote to memory of 2592	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	39
PID 1708 wrote to memory of 2592	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	39
PID 1708 wrote to memory of 2592	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	39
PID 1708 wrote to memory of 2592	1708	e0a9ef38f65d7d2f909db84733c0e66c.exe	39
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41
PID 2752 wrote to memory of 2432	2752	bquyobss.exe	41

C:\Users\Admin\AppData\Local\Temp\e0a9ef38f65d7d2f909db84733c0e66c.exe
"C:\Users\Admin\AppData\Local\Temp\e0a9ef38f65d7d2f909db84733c0e66c.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1708
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yoivqmku\
  2⤵
  PID:2604
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bquyobss.exe" C:\Windows\SysWOW64\yoivqmku\
  2⤵
  PID:2556
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yoivqmku binPath= "C:\Windows\SysWOW64\yoivqmku\bquyobss.exe /d\"C:\Users\Admin\AppData\Local\Temp\e0a9ef38f65d7d2f909db84733c0e66c.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2720
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yoivqmku "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:1420
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yoivqmku
  2⤵
  - Launches sc.exe
  PID:2572
- 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:2592

C:\Windows\SysWOW64\yoivqmku\bquyobss.exe
C:\Windows\SysWOW64\yoivqmku\bquyobss.exe /d"C:\Users\Admin\AppData\Local\Temp\e0a9ef38f65d7d2f909db84733c0e66c.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2752
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2432

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 System Firewall

T1562.004

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

bquyobss.exe

Path C:\Users\Admin\AppData\Local\Temp\bquyobss.exe
Size 10.1MB
SHA256 4dc7bb783bec54f6b309e015730eec412d37a1492c321ce64140a1011dfcace0
MD5 a2f1c7c2a93017a4aa1a85e0f96e3900
SHA1 d618987a5ff4f002c9ab24911114aef1f0fb2ab2
SHA512 40c85be37fa0197614a3b73cf5fa9b989c8b8d821a89234ec6a1bc20285a77be1e4190d16246c486462bac3aa34431158f0919ab23cff9d083142d2202caa248
SSDEEP 49152:w666666666666666666666666666666666666666666666666666666666666667:
MD5 SHA1 SHA512 SSDEEP

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bquyobss.exe

Path C:\Windows\SysWOW64\yoivqmku\bquyobss.exe
Size 5.8MB
SHA256 168fc5da0bb837f06c0148e6a7c8981a4da0a7dc085928927642a1d74bd0fde3
MD5 e371c8befc2da3d381eb3ab37497e751
SHA1 a00e785cd071e56f4fd189df4f139b2c1c3cb467
SHA512 3ebeff97679b33931c6a7f7467ad215cf8e0a6d844f98d80b3bf74d2c6c0999af20d96db687ea06621bc7d17ecae44c8843e2649cb31017d92a3a20ce17aaddb
SSDEEP 49152:w66666666666666666666666666666666666666666666666666666666666666j:
MD5 SHA1 SHA512 SSDEEP

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memory/1708-1-0x0000000000CA0000-0x0000000000DA0000-memory.dmp

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memory/1708-2-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1708-4-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/1708-8-0x0000000000220000-0x0000000000233000-memory.dmp

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memory/1708-7-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/2432-11-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2432-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/2432-15-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2432-19-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2432-20-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2432-21-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2432-22-0x0000000000080000-0x0000000000095000-memory.dmp

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memory/2752-10-0x00000000002F0000-0x00000000003F0000-memory.dmp

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memory/2752-13-0x0000000000400000-0x0000000000C0A000-memory.dmp

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memory/2752-16-0x0000000000400000-0x0000000000C0A000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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