b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8

Analysis

max time kernel
120s
max time network
119s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
20/09/2024, 07:58

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General

Target

b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
Size

69KB
MD5

f5b73d90ba4365b2132ee65c4d1c8480
SHA1

0e146a1070fc7b67a28b81343c14a85133ce7c61
SHA256

b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8
SHA512

307c4fd078759f4d60674597b7b814501dab027bb7234bc5b920e1a16ba9969fa14c9f1d96573b19771edc172dabfb38f9454d7ab814b9830c6f3e58a4cae2f8
SSDEEP

1536:EJrFDMRyriCY/qXfatMp4Q2V6fIMxIpLI:0F8dCY85TE6fIMSRI

Score

10^/10

discovery evasion persistence upx

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-1-5-21-2170637797-568393320-3232933035-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-2170637797-568393320-3232933035-1000\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\{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
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

Executes dropped EXE 4 IoCs

pid	Process
4928	explorer.exe
1944	spoolsv.exe
2440	svchost.exe
4828	spoolsv.exe

UPX packed file 11 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2680-0-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/files/0x000800000002361d-7.dat	upx
behavioral2/files/0x000800000002361f-13.dat	upx
behavioral2/files/0x0008000000023621-23.dat	upx
behavioral2/memory/4828-32-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/1944-36-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/files/0x0009000000023620-37.dat	upx
behavioral2/memory/2680-39-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/4928-40-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/2440-41-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral2/memory/4928-52-0x0000000000400000-0x0000000000434000-memory.dmp	upx

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\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	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
File opened for modification	\??\c:\windows\system\spoolsv.exe	explorer.exe
File opened for modification	\??\c:\windows\system\svchost.exe	spoolsv.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 7 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	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	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	explorer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsv.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
4928	explorer.exe
4928	explorer.exe
4928	explorer.exe
4928	explorer.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
2440	svchost.exe
4928	explorer.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe
4928	explorer.exe
4928	explorer.exe
2440	svchost.exe
2440	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
4928	explorer.exe
2440	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
4928	explorer.exe
4928	explorer.exe
1944	spoolsv.exe
1944	spoolsv.exe
2440	svchost.exe
2440	svchost.exe
4828	spoolsv.exe
4828	spoolsv.exe
4928	explorer.exe
4928	explorer.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 4928	2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	89
PID 2680 wrote to memory of 4928	2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	89
PID 2680 wrote to memory of 4928	2680	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	89
PID 4928 wrote to memory of 1944	4928	explorer.exe	90
PID 4928 wrote to memory of 1944	4928	explorer.exe	90
PID 4928 wrote to memory of 1944	4928	explorer.exe	90
PID 1944 wrote to memory of 2440	1944	spoolsv.exe	91
PID 1944 wrote to memory of 2440	1944	spoolsv.exe	91
PID 1944 wrote to memory of 2440	1944	spoolsv.exe	91
PID 2440 wrote to memory of 4828	2440	svchost.exe	92
PID 2440 wrote to memory of 4828	2440	svchost.exe	92
PID 2440 wrote to memory of 4828	2440	svchost.exe	92
PID 2440 wrote to memory of 5052	2440	svchost.exe	93
PID 2440 wrote to memory of 5052	2440	svchost.exe	93
PID 2440 wrote to memory of 5052	2440	svchost.exe	93
PID 2440 wrote to memory of 1788	2440	svchost.exe	105
PID 2440 wrote to memory of 1788	2440	svchost.exe	105
PID 2440 wrote to memory of 1788	2440	svchost.exe	105

C:\Users\Admin\AppData\Local\Temp\b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
"C:\Users\Admin\AppData\Local\Temp\b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.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:2680
- \??\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
  - 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:4928
- - \??\c:\windows\system\spoolsv.exe
    c:\windows\system\spoolsv.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:1944
  - - \??\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
      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:2440
    - - \??\c:\windows\system\spoolsv.exe
        
        c:\windows\system\spoolsv.exe PR
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:4828
    - - C:\Windows\SysWOW64\at.exe
        
        at 08:00 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:5052
    - - C:\Windows\SysWOW64\at.exe
        
        at 08:01 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:1788

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 --field-trial-handle=3768,i,15336851255456239337,16379811035920490645,262144 --variations-seed-version --mojo-platform-channel-handle=2644 /prefetch:8
1⤵
PID:216

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
69KB

MD5
e15366774d0d76cc44b75b6a4008f4bc

SHA1
64287ea3cdaf477b4d2d8e26065b3b6cd60ca206

SHA256
10b35fa0e581aa26c5024fa0a0840c335e9f9eadfb12162458d8f9b225a26295

SHA512
4d1edba278edc8fd89d9679d3d7350946200752801947c5305ede4c3cdccb7243837ec6d1c92256c7b191f881d30d9a7192a966f9791bad64c3aeb1c7902675d

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

Filesize
69KB

MD5
14a60fa14d44d74dcd785b53d80af2a3

SHA1
d7e422b258f1e44ac55d77c5932e973e5ac38577

SHA256
2fa47a98d842ac7fdd588033abebcd5ac16322ded38f7a5d73ed6dd02003514b

SHA512
93e5aed9b94547ae161d9cd92b06af13b2b6e6f63db50f6e5d5b3dbd57033f86805b68fa15e665b3c21e1a182c2f95e958d35049fd63a1fe216d1bdc152b6177

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

Filesize
69KB

MD5
e690273ed0b80ad7dcf645622454dbd8

SHA1
ac9d4feed89474749c7007a71431ec817c7bf8bc

SHA256
a9f3b43c5852e2726d9fe0d749b141dd21fe5ec9b034150437590ced181a8ea4

SHA512
f399d0ee82437bfc2ddbd34c3f547eb9c9008e8bfcdacd6675c462c874c66334599a914913b4ac69a1516c8e8e42ed503fa492c85f02393c619a99b11e173e4a

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

Filesize
70KB

MD5
892f2e915df87057728802ee8c97249b

SHA1
5bd75f65b82fd96137a6fac188d2ed209efaa911

SHA256
4855ca04a37a5d1c3759ac9d71abe072ab735dc2cbe856566acc02ec0b2ac088

SHA512
6305a709d02e2e4d142347ec4442208f8ef8093d6ea1de112ccf1fcdee780bd193ba810cb6239cb2f174b67111ff08603b7be9ea3b3111e6f7ae2ed50d85d3c8

Download Submit
memory/1944-36-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2440-41-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2680-0-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2680-39-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/4828-32-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/4928-40-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/4928-52-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download