b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74

Analysis

max time kernel
150s
max time network
125s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
26/07/2024, 02:18

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General

Target

b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
Size

1.4MB
MD5

f2af0cf68dfd2a651cc66ad92ea4524a
SHA1

95ccb921e2f012b426ee89b1901b28ef661d93eb
SHA256

b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74
SHA512

4cade9d6e64030d5bfb1dffe451efbba70c8c1a7d77b945fdd364870773504c634efc3a662b1ae2b2ceb1c39939a47efbb545ba65a1c634330df181119fac198
SSDEEP

24576:T9cdOqX1uuMliQzd4mNy9Sh5hJgpiwVQLJaOSZ4LehoZza9gNWmAO5ehlM+:T9UX1uBx4mYo83vOSeyeaKrE

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\\system\\explorer.exe"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\system\\explorer.exe"	svchost.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-1-5-21-3450744190-3404161390-554719085-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3450744190-3404161390-554719085-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.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\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	svchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	svchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	svchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	svchost.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Roaming\\mrsys.exe MR"	explorer.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	svchost.exe

Executes dropped EXE 4 IoCs

pid	Process
1964	explorer.exe
2656	spoolsv.exe
2792	svchost.exe
2704	spoolsv.exe

Loads dropped DLL 8 IoCs

pid	Process
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
1964	explorer.exe
1964	explorer.exe
2656	spoolsv.exe
2656	spoolsv.exe
2792	svchost.exe
2792	svchost.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\Explorer = "c:\\windows\\system\\explorer.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	explorer.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 34 IoCs

pid	Process
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
1964	explorer.exe
1964	explorer.exe
2656	spoolsv.exe
2792	svchost.exe
2704	spoolsv.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\system\explorer.exe	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.exe
File opened for modification	\??\c:\windows\system\explorer.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	svchost.exe
File opened for modification	C:\Windows\system\udsys.exe	explorer.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 8 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	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	at.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	at.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	at.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
1964	explorer.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe
2792	svchost.exe
1964	explorer.exe
2792	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
1964	explorer.exe
2792	svchost.exe

Suspicious use of SetWindowsHookEx 17 IoCs

pid	Process
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
1964	explorer.exe
1964	explorer.exe
1964	explorer.exe
2656	spoolsv.exe
2656	spoolsv.exe
2656	spoolsv.exe
2792	svchost.exe
2792	svchost.exe
2792	svchost.exe
2704	spoolsv.exe
2704	spoolsv.exe
2704	spoolsv.exe
1964	explorer.exe
1964	explorer.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 1964	2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe	30
PID 2380 wrote to memory of 1964	2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe	30
PID 2380 wrote to memory of 1964	2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe	30
PID 2380 wrote to memory of 1964	2380	b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe	30
PID 1964 wrote to memory of 2656	1964	explorer.exe	31
PID 1964 wrote to memory of 2656	1964	explorer.exe	31
PID 1964 wrote to memory of 2656	1964	explorer.exe	31
PID 1964 wrote to memory of 2656	1964	explorer.exe	31
PID 2656 wrote to memory of 2792	2656	spoolsv.exe	32
PID 2656 wrote to memory of 2792	2656	spoolsv.exe	32
PID 2656 wrote to memory of 2792	2656	spoolsv.exe	32
PID 2656 wrote to memory of 2792	2656	spoolsv.exe	32
PID 2792 wrote to memory of 2704	2792	svchost.exe	33
PID 2792 wrote to memory of 2704	2792	svchost.exe	33
PID 2792 wrote to memory of 2704	2792	svchost.exe	33
PID 2792 wrote to memory of 2704	2792	svchost.exe	33
PID 2792 wrote to memory of 2580	2792	svchost.exe	35
PID 2792 wrote to memory of 2580	2792	svchost.exe	35
PID 2792 wrote to memory of 2580	2792	svchost.exe	35
PID 2792 wrote to memory of 2580	2792	svchost.exe	35
PID 2792 wrote to memory of 652	2792	svchost.exe	37
PID 2792 wrote to memory of 652	2792	svchost.exe	37
PID 2792 wrote to memory of 652	2792	svchost.exe	37
PID 2792 wrote to memory of 652	2792	svchost.exe	37
PID 2792 wrote to memory of 2912	2792	svchost.exe	39
PID 2792 wrote to memory of 2912	2792	svchost.exe	39
PID 2792 wrote to memory of 2912	2792	svchost.exe	39
PID 2792 wrote to memory of 2912	2792	svchost.exe	39

C:\Users\Admin\AppData\Local\Temp\b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe
"C:\Users\Admin\AppData\Local\Temp\b4041377281a95568381363ec6c3826d11948d1449bda36d6a0d6bb50e8c9a74.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2380
- \??\c:\windows\system\explorer.exe
  c:\windows\system\explorer.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Boot or Logon Autostart Execution: Active Setup
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - 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:1964
- - \??\c:\windows\system\spoolsv.exe
    c:\windows\system\spoolsv.exe SE
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2656
  - - \??\c:\windows\system\svchost.exe
      c:\windows\system\svchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Boot or Logon Autostart Execution: Active Setup
      Executes dropped EXE
      Loads dropped DLL
      Adds Run key to start application
      Suspicious use of NtSetInformationThreadHideFromDebugger
      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:2792
    - - \??\c:\windows\system\spoolsv.exe
        
        c:\windows\system\spoolsv.exe PR
        5⤵
        Executes dropped EXE
        Suspicious use of NtSetInformationThreadHideFromDebugger
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:2704
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:21 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2580
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:22 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:652
    - - C:\Windows\SysWOW64\at.exe
        
        at 02:23 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2912

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\Roaming\mrsys.exe

Filesize
1.4MB

MD5
a055859c68317abbf638188e9da7f865

SHA1
715fc993f2a350a774d1da92b441fa05fbf37672

SHA256
c946ba7a05f049f7c3f1c39951f5cc7e97a2899a3e66e72d102409f6cb52c089

SHA512
920bc7771101d8abbd8462f1eafb1db37cd7a4e69fd254af5d51a1a7bb37caf1c185b55363927d20f350de9014ba826296144ede044c6e910306294e65060548

Download Submit
\Windows\system\explorer.exe

Filesize
1.4MB

MD5
2f7653ab9559e51b7ba70e750bd04135

SHA1
af69b730cea9bd9b82066a21c134a60e6b6fa50a

SHA256
2d212e68f07c7f6f8b57f14c47126a4846c2ea2989ef57e3c7b4f6553c098ecd

SHA512
2eec9367ea7f467039b0f946f9caa69593d873bb9afa0675ab5be484820e7b301d67f34696629248b55801cf633c8fda68577d6e5c595c523422e05875776029

Download Submit
\Windows\system\spoolsv.exe

Filesize
1.4MB

MD5
bb815d49b39c7949e9a52ee2bfee49ab

SHA1
8606ad91194d59f77423df4ad5c9857706fc227e

SHA256
fe377b62078dc5c8392ef150ab1a069855b4fe2ee307deff3096f8239cf32e61

SHA512
4fdd68f0e503e9c2d89e9f5d0f78f6409ff36920015a16c5998f20ce123d6cea63feff9509ecd5971f78ce77615f8936c4fd1cfd6ce9cdea096bfea7b4f806f4

Download Submit
\Windows\system\svchost.exe

Filesize
1.4MB

MD5
c8595d45355e5587214b546774582bf9

SHA1
0db75c1c96e7e08b7e519836e3aa4801276cae52

SHA256
0b142be2a52005fe0b5a5345525f36ee033ce56dbbb8e77608609742c5581a62

SHA512
ffa87d9aad1e487092a267aeef713e58519baae70d4dab6b26031c119594c60623ccff61406d7f7eaa91c86b4a0eb2c1635bf28e4e0d88f287d21cda8283e829

Download Submit
memory/1964-93-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-30-0x0000000004440000-0x00000000049E0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-34-0x0000000004440000-0x00000000049E0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-96-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-16-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-83-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-79-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/1964-70-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2380-0-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2380-14-0x0000000004710000-0x0000000004CB0000-memory.dmp

Filesize
5.6MB

Download
memory/2380-68-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2380-1-0x0000000077790000-0x0000000077791000-memory.dmp

Filesize
4KB

Download
memory/2380-62-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2656-31-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2656-67-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2656-54-0x0000000004690000-0x0000000004C30000-memory.dmp

Filesize
5.6MB

Download
memory/2656-45-0x0000000004690000-0x0000000004C30000-memory.dmp

Filesize
5.6MB

Download
memory/2704-59-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2704-61-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-63-0x0000000003E40000-0x00000000043E0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-71-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-74-0x0000000003E40000-0x00000000043E0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-82-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-55-0x0000000003E40000-0x00000000043E0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-49-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download
memory/2792-97-0x0000000000400000-0x00000000009A0000-memory.dmp

Filesize
5.6MB

Download