81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e

Analysis

max time kernel
157s
max time network
163s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
03/06/2024, 00:12

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General

Target

81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
Size

65KB
MD5

1776870e08d43bad71031a61c0338a53
SHA1

436ace6e362807fc0e19ae5aea4ffd7b78d8ee0b
SHA256

81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e
SHA512

7f3bd946f304d079ceb96334d69268dfa0259a332b7b99b3f29556a48f7205e86c5df2af863f871f98822094650ba86f2b95341d9c27f248ecfeb61d5e3fba3a
SSDEEP

1536:ECq3yRuqrI01eArdW/O7JnI2e13XiLij40MkTUVqa/OuT:7WNqkOJWmo1HpM0MkTUmuT

Score

10^/10

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"	svchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\system\\explorer.exe"	explorer.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-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	svchost.exe

Modifies Installed Components in the registry 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

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
4676	explorer.exe
2360	spoolsv.exe
4232	svchost.exe
224	spoolsv.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"	explorer.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Svchost = "c:\\windows\\system\\svchost.exe RO"	explorer.exe
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

Drops file in Windows directory 6 IoCs

description	ioc	Process
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
File opened for modification	\??\c:\windows\system\explorer.exe	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
4676	explorer.exe
4676	explorer.exe
4676	explorer.exe
4676	explorer.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe
4676	explorer.exe
4676	explorer.exe
4232	svchost.exe
4232	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
4232	svchost.exe
4676	explorer.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
4676	explorer.exe
4676	explorer.exe
2360	spoolsv.exe
2360	spoolsv.exe
4232	svchost.exe
4232	svchost.exe
224	spoolsv.exe
224	spoolsv.exe
4676	explorer.exe
4676	explorer.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3148 wrote to memory of 4676	3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe	91
PID 3148 wrote to memory of 4676	3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe	91
PID 3148 wrote to memory of 4676	3148	81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe	91
PID 4676 wrote to memory of 2360	4676	explorer.exe	92
PID 4676 wrote to memory of 2360	4676	explorer.exe	92
PID 4676 wrote to memory of 2360	4676	explorer.exe	92
PID 2360 wrote to memory of 4232	2360	spoolsv.exe	93
PID 2360 wrote to memory of 4232	2360	spoolsv.exe	93
PID 2360 wrote to memory of 4232	2360	spoolsv.exe	93
PID 4232 wrote to memory of 224	4232	svchost.exe	94
PID 4232 wrote to memory of 224	4232	svchost.exe	94
PID 4232 wrote to memory of 224	4232	svchost.exe	94
PID 4232 wrote to memory of 5036	4232	svchost.exe	95
PID 4232 wrote to memory of 5036	4232	svchost.exe	95
PID 4232 wrote to memory of 5036	4232	svchost.exe	95
PID 4232 wrote to memory of 4588	4232	svchost.exe	106
PID 4232 wrote to memory of 4588	4232	svchost.exe	106
PID 4232 wrote to memory of 4588	4232	svchost.exe	106
PID 4232 wrote to memory of 4460	4232	svchost.exe	108
PID 4232 wrote to memory of 4460	4232	svchost.exe	108
PID 4232 wrote to memory of 4460	4232	svchost.exe	108

C:\Users\Admin\AppData\Local\Temp\81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe
"C:\Users\Admin\AppData\Local\Temp\81a2b08ade27d47514e9f208bfd8bbd2e5e9487b4aeb7e1132facf39afa10a7e.exe"
1⤵
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3148
- \??\c:\windows\system\explorer.exe
  c:\windows\system\explorer.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Modifies Installed Components in the registry
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in Windows directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4676
- - \??\c:\windows\system\spoolsv.exe
    c:\windows\system\spoolsv.exe SE
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2360
  - - \??\c:\windows\system\svchost.exe
      c:\windows\system\svchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Modifies Installed Components in the registry
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:4232
    - - \??\c:\windows\system\spoolsv.exe
        
        c:\windows\system\spoolsv.exe PR
        5⤵
        Executes dropped EXE
        Suspicious use of SetWindowsHookEx
        
        PID:224
    - - C:\Windows\SysWOW64\at.exe
        
        at 00:14 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:5036
    - - C:\Windows\SysWOW64\at.exe
        
        at 00:15 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:4588
    - - C:\Windows\SysWOW64\at.exe
        
        at 00:16 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        
        PID:4460

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3704 --field-trial-handle=2252,i,16022092570067181109,3235558581947505669,262144 --variations-seed-version /prefetch:8
1⤵
PID:3648

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

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
65KB

MD5
d85acbb987686c64471a3107bd6aea33

SHA1
1456cc8a34c3e03ef66c9e82c80d36705b7027c5

SHA256
3508fd2cade2a2485f1f8bc990572fbad5b07a5d0963ae063d01ece8fa37b280

SHA512
0164ea9acc55f36f644e9274b3ece9979997951983cc1cf3f22596eec774a9335f6540105109dc93433e052417796f1d907be41ea91243e9d238f634d1a4a565

Download Submit
C:\Windows\System\explorer.exe

Filesize
65KB

MD5
46057c0f1f5d55d9584a6e35fe6272e8

SHA1
9565e744eda4668793d23f8e54c5523b0ed07f2e

SHA256
cad40d777bc80abdf1d4090eb28b8dfb61ad0750867c519faf002974be69b448

SHA512
766fbd96c1a3385ac485f9edc2eaf6a7b12ae44e824041e5d9206868696eedd887aac7fc109ebb5c3be9ffab6b57d71e315943319839c56af07f91b05b86e11f

Download Submit
C:\Windows\System\spoolsv.exe

Filesize
65KB

MD5
f08b97d36365882f056ca4dfb54d8cab

SHA1
46cc5f6827a3ebcbc6aedbc288b3237b52017798

SHA256
637bc1cc1f00954d08ef56fbb1723833dc8d2145f46bbbcd218def9c86e0ea28

SHA512
6490c2018009a0bb444beafe3b46870cbbe08fc57113fb77cf56bcc522e961e9b40592d044e8bbea1b458575c701c3ac7d6b5ee025fca0a441d8a8b614996655

Download Submit
C:\Windows\System\svchost.exe

Filesize
65KB

MD5
adf9707f33bffdaf3e7c300653d0784f

SHA1
747e386dcfb58574ad7052a679a5b995f0ae0a09

SHA256
382297f4b64b0fb8431d4532802216b28083fb847799ef4033af35ce84e01968

SHA512
490446613ba0548f3a872e0591b59071ca00a49344a8b7ddf4a10f2c4aee1bf65255dc4b96e7d5f9d0b46c73aa2fadace9b66d1c79f05656e02a77f0b691d1d6

Download Submit
memory/224-50-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/224-44-0x0000000075530000-0x000000007568D000-memory.dmp

Filesize
1.4MB

Download
memory/2360-51-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2360-25-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2360-26-0x0000000075530000-0x000000007568D000-memory.dmp

Filesize
1.4MB

Download
memory/3148-43-0x0000000000401000-0x000000000042E000-memory.dmp

Filesize
180KB

Download
memory/3148-4-0x0000000000401000-0x000000000042E000-memory.dmp

Filesize
180KB

Download
memory/3148-56-0x0000000000401000-0x000000000042E000-memory.dmp

Filesize
180KB

Download
memory/3148-2-0x0000000075530000-0x000000007568D000-memory.dmp

Filesize
1.4MB

Download
memory/3148-36-0x00000000001C0000-0x00000000001C4000-memory.dmp

Filesize
16KB

Download
memory/3148-55-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/3148-1-0x00000000001C0000-0x00000000001C4000-memory.dmp

Filesize
16KB

Download
memory/3148-0-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/3148-3-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/4232-37-0x0000000075530000-0x000000007568D000-memory.dmp

Filesize
1.4MB

Download
memory/4232-59-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/4676-13-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/4676-16-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/4676-14-0x0000000075530000-0x000000007568D000-memory.dmp

Filesize
1.4MB

Download
memory/4676-57-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/4676-70-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download