d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c

Analysis

max time kernel
150s
max time network
119s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
29/09/2024, 03:11

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target

d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
Size

211KB
MD5

9331f7abed97b237181938a171ccd8f7
SHA1

bb3995196ce1b4b4a3b01e1dd1c44ee60e04babd
SHA256

d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c
SHA512

b86a1f986106eba5507d521cd0c358532900b72f4dd43283f5783dd54b820038b6f8fe6fa9b0aaa026e1b0def026e986d3d8effb14f359a327fbbe382c8717fd
SSDEEP

3072:JD6Xtx68yygRBE52mxkEOHLRMpZ4deth8PEAjAfIbAYGPhz6sPJBInxZqO3:Jh8cBzHLRMpZ4d1Z3

Score

10^/10

discovery evasion persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	swchost.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	userinit.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	swchost.exe

Boot or Logon Autostart Execution: Active Setup 2 TTPs 8 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	userinit.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	userinit.exe

Executes dropped EXE 4 IoCs

pid	Process
2920	userinit.exe
2864	spoolsw.exe
2740	swchost.exe
2916	spoolsw.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	swchost.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\system\udsys.exe	userinit.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\userinit.exe	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
File opened for modification	\??\c:\windows\spoolsw.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	spoolsw.exe
File opened for modification	\??\c:\windows\userinit.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	swchost.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	userinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	swchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
2920	userinit.exe
2920	userinit.exe
2920	userinit.exe
2740	swchost.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe
2920	userinit.exe
2740	swchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2920	userinit.exe
2740	swchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
2920	userinit.exe
2920	userinit.exe
2864	spoolsw.exe
2864	spoolsw.exe
2740	swchost.exe
2740	swchost.exe
2916	spoolsw.exe
2916	spoolsw.exe
2920	userinit.exe
2920	userinit.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 1704 wrote to memory of 2920	1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe	31
PID 1704 wrote to memory of 2920	1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe	31
PID 1704 wrote to memory of 2920	1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe	31
PID 1704 wrote to memory of 2920	1704	d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe	31
PID 2920 wrote to memory of 2864	2920	userinit.exe	32
PID 2920 wrote to memory of 2864	2920	userinit.exe	32
PID 2920 wrote to memory of 2864	2920	userinit.exe	32
PID 2920 wrote to memory of 2864	2920	userinit.exe	32
PID 2864 wrote to memory of 2740	2864	spoolsw.exe	33
PID 2864 wrote to memory of 2740	2864	spoolsw.exe	33
PID 2864 wrote to memory of 2740	2864	spoolsw.exe	33
PID 2864 wrote to memory of 2740	2864	spoolsw.exe	33
PID 2740 wrote to memory of 2916	2740	swchost.exe	34
PID 2740 wrote to memory of 2916	2740	swchost.exe	34
PID 2740 wrote to memory of 2916	2740	swchost.exe	34
PID 2740 wrote to memory of 2916	2740	swchost.exe	34

C:\Users\Admin\AppData\Local\Temp\d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe
"C:\Users\Admin\AppData\Local\Temp\d133481550e0bb90c316990a83090fc283dd7eb31c942cd7eb5824056df2102c.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1704
- \??\c:\windows\userinit.exe
  c:\windows\userinit.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Boot or Logon Autostart Execution: Active Setup
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2920
- - \??\c:\windows\spoolsw.exe
    c:\windows\spoolsw.exe SE
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2864
  - - \??\c:\windows\swchost.exe
      c:\windows\swchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Boot or Logon Autostart Execution: Active Setup
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2740
    - - \??\c:\windows\spoolsw.exe
        
        c:\windows\spoolsw.exe PR
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:2916

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\mrsys.exe

Filesize
211KB

MD5
e351336794abd70adc62d1ea7178d52d

SHA1
291ea35baa08761cf1ccf5bf80c6d7caf7cfaccc

SHA256
1f231fc321f31576346b3508b6ae55ebecf9a31b25eb55b2bc82413e7680fec7

SHA512
f3b310890d784c4c0f2a0f17a83b66451c8ef2ef091d1f59f923b5c70ee677370c378f6454322cdd516b216c2ae77e7a7c01e64be92c7a7661c0af8581899a02

Download Submit
C:\Windows\spoolsw.exe

Filesize
211KB

MD5
500326f62d1b0ab596a5c1f6d43039fe

SHA1
e65264b642516a8aedae0672a7c51be910af9d68

SHA256
aba9d1001885e04905ccd017461ba1b9fa3618e0582a9f6486ac97d47e646eb4

SHA512
a07fe65548d016af998f0abeffeded8743adf34fc10e9f94c37474b1ab6d31e100d4e2fc2df0c4ddac881720780b3d1221cbba8fe7aa35f814b5b895b33bb01e

Download Submit
C:\Windows\swchost.exe

Filesize
211KB

MD5
d7f4ae6564791a421ebcd44a7060bc9b

SHA1
f32e36b0ceefde1719d6f4188c21cfae958f2cac

SHA256
8d106cf5b798fd03f9302ce8dc25abf81529b205ece7d93555854ffe7079af51

SHA512
9947b273aec1d8c702dddea984c0f0319665c1499de09a6960667ba5fe1638cc0148ac296db46df4bbbdb9bc5146d67ce1d218570a438c26002f2f207cd745af

Download Submit
C:\Windows\userinit.exe

Filesize
211KB

MD5
4d923828bcbce4946f15d0ecd9600eb1

SHA1
c184e0c80f3045780da10bce462de845ca08f0f3

SHA256
6087d30a1436251124521ad20cdeef2ab4f2bbebcdaafa6d1000c18cab7c9f38

SHA512
2720a19479cc68eb8d7c3d441eeb845b693ac8299a930da479c06a7d9cc2b1ff0f0c953525442553e00ae9378ec3bb0004353c7be2e6c839f537ef7b4ca583ed

Download Submit