62bcfc7301c5e4fa40e052c20696efcf7adbdafc685e4141747ca6971f7dfb90

Analysis

max time kernel
120s
max time network
17s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
07/09/2024, 10:23

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General

Target

bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
Size

211KB
MD5

bef7cb55b42d2eefbc137b0e1cc8cf70
SHA1

298e292afb2ccc5103e846bb05bd1bbcc75d78bb
SHA256

62bcfc7301c5e4fa40e052c20696efcf7adbdafc685e4141747ca6971f7dfb90
SHA512

7d766f90e7f36f256268965dca4edbb4d7f3fd04e029fd1f2e57d0f0fee0f26a9e7e497d0946951a1c115cb74425ae55afda887a1ae7a26d29221b5608765bb8
SSDEEP

3072:bDpM9Nvih5c9DE1pvAPXIHLfMgw7ySBL8PEAjAfIbAYGPJz6sPJBINFZ1FqnF:b1iNKQxENHLfMgw7y9ZrK

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-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	swchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3551809350-4263495960-1443967649-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	userinit.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
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
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

Executes dropped EXE 4 IoCs

pid	Process
2760	userinit.exe
2844	spoolsw.exe
2896	swchost.exe
2732	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\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	userinit.exe

Drops file in System32 directory 1 IoCs

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

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\swchost.exe	swchost.exe
File opened for modification	\??\c:\windows\userinit.exe	bef7cb55b42d2eefbc137b0e1cc8cf70N.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

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	spoolsw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
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

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2760	userinit.exe
2760	userinit.exe
2760	userinit.exe
2896	swchost.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe
2760	userinit.exe
2896	swchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2760	userinit.exe
2896	swchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2760	userinit.exe
2760	userinit.exe
2844	spoolsw.exe
2844	spoolsw.exe
2896	swchost.exe
2896	swchost.exe
2732	spoolsw.exe
2732	spoolsw.exe
2760	userinit.exe
2760	userinit.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 2760	2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	31
PID 2084 wrote to memory of 2760	2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	31
PID 2084 wrote to memory of 2760	2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	31
PID 2084 wrote to memory of 2760	2084	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	31
PID 2760 wrote to memory of 2844	2760	userinit.exe	32
PID 2760 wrote to memory of 2844	2760	userinit.exe	32
PID 2760 wrote to memory of 2844	2760	userinit.exe	32
PID 2760 wrote to memory of 2844	2760	userinit.exe	32
PID 2844 wrote to memory of 2896	2844	spoolsw.exe	33
PID 2844 wrote to memory of 2896	2844	spoolsw.exe	33
PID 2844 wrote to memory of 2896	2844	spoolsw.exe	33
PID 2844 wrote to memory of 2896	2844	spoolsw.exe	33
PID 2896 wrote to memory of 2732	2896	swchost.exe	34
PID 2896 wrote to memory of 2732	2896	swchost.exe	34
PID 2896 wrote to memory of 2732	2896	swchost.exe	34
PID 2896 wrote to memory of 2732	2896	swchost.exe	34

C:\Users\Admin\AppData\Local\Temp\bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
"C:\Users\Admin\AppData\Local\Temp\bef7cb55b42d2eefbc137b0e1cc8cf70N.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:2084
- \??\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:2760
- - \??\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:2844
  - - \??\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:2896
    - - \??\c:\windows\spoolsw.exe
        
        c:\windows\spoolsw.exe PR
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:2732

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

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Downloads

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

Filesize
211KB

MD5
fd1fcf2e2e6f5de561e570b6fa6094bd

SHA1
ab59f224463ae8a238a988999e6ef8176744169b

SHA256
5068052f6f4a54eaa194f35c16f9fe8d05d20ed5661374ccb101b8a69614fe59

SHA512
17cff0377aaca77e66ca5ae0a649981c51b3559e7e852117594025091fbe3134cba0ed8f244b6e96cb4922151b8db2d7ecfde9dd7c104b75a69ac78534f3f0fb

Download Submit
C:\Windows\spoolsw.exe

Filesize
211KB

MD5
c765b4a493d253bed7665778a82815f0

SHA1
934b2c49b9faf3782a853201bd6735984fa87056

SHA256
1404d4b9e49c84f40956e0ae1fe9368ffa0801dc0f57e2c3d2eb042bc30c3342

SHA512
6a3c3b66ebdef83f781393eb69331f7c92354286c01ddf1bb7641e2df242217b34518a938e9e752f8e806d5c11e0060818c22bcb35be9aeffc27fa91ad4e7845

Download Submit
C:\Windows\swchost.exe

Filesize
211KB

MD5
a983f4939a913ff87a9149f55abe6d99

SHA1
7a6b20d7fe9304b07033bb49312fd12fb96a016d

SHA256
3f30f38d03f8d7407a38c5e650ef8afead9464df7de8367b258dc248c6bac0a7

SHA512
ea5f26a2489424887321afea12c81ce7c3a5e9b11039323dcb8951638dcdc94a6d77e3d01fc3ba3a622ba2fcf3b8b060884199b1596a2808ec32f05ebf9b33a9

Download Submit
C:\Windows\userinit.exe

Filesize
211KB

MD5
440ee49977b1db76d0933b7de0ed9b91

SHA1
6c786c15de1456432cc8baf0edaeddc39dd92391

SHA256
d428e84d31908470ade08fd7e917aa433bfee6ff91273eefe87954111db3e2f8

SHA512
5b5c898cfedb08ae90e21fe8af018a7e168a26df0ee254f4e093843a514a665c5f46bee247d4a24eec8321a68fb997da6f16c485f2b8995bdd9971282684e1db

Download Submit