b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8

Analysis

max time kernel
120s
max time network
16s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-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-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	explorer.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\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
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
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

Executes dropped EXE 4 IoCs

pid	Process
2004	explorer.exe
2168	spoolsv.exe
2296	svchost.exe
2804	spoolsv.exe

Loads dropped DLL 8 IoCs

pid	Process
2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2004	explorer.exe
2004	explorer.exe
2168	spoolsv.exe
2168	spoolsv.exe
2296	svchost.exe
2296	svchost.exe

UPX packed file 14 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2260-0-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/files/0x0009000000016855-6.dat	upx
behavioral1/files/0x0008000000016c84-21.dat	upx
behavioral1/memory/2168-30-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/files/0x0008000000016cfc-36.dat	upx
behavioral1/memory/2260-48-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2804-55-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2168-59-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2260-61-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/files/0x0009000000016cd1-62.dat	upx
behavioral1/memory/2004-63-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2296-64-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2004-65-0x0000000000400000-0x0000000000434000-memory.dmp	upx
behavioral1/memory/2004-77-0x0000000000400000-0x0000000000434000-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\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Explorer = "c:\\windows\\system\\explorer.exe RO"	svchost.exe

Drops file in Windows directory 6 IoCs

description	ioc	Process
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
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 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	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
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

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2004	explorer.exe
2004	explorer.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe
2004	explorer.exe
2296	svchost.exe
2004	explorer.exe
2004	explorer.exe
2296	svchost.exe
2296	svchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2004	explorer.exe
2296	svchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
2004	explorer.exe
2004	explorer.exe
2168	spoolsv.exe
2168	spoolsv.exe
2296	svchost.exe
2296	svchost.exe
2804	spoolsv.exe
2804	spoolsv.exe
2004	explorer.exe
2004	explorer.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2260 wrote to memory of 2004	2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	30
PID 2260 wrote to memory of 2004	2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	30
PID 2260 wrote to memory of 2004	2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	30
PID 2260 wrote to memory of 2004	2260	b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe	30
PID 2004 wrote to memory of 2168	2004	explorer.exe	31
PID 2004 wrote to memory of 2168	2004	explorer.exe	31
PID 2004 wrote to memory of 2168	2004	explorer.exe	31
PID 2004 wrote to memory of 2168	2004	explorer.exe	31
PID 2168 wrote to memory of 2296	2168	spoolsv.exe	32
PID 2168 wrote to memory of 2296	2168	spoolsv.exe	32
PID 2168 wrote to memory of 2296	2168	spoolsv.exe	32
PID 2168 wrote to memory of 2296	2168	spoolsv.exe	32
PID 2296 wrote to memory of 2804	2296	svchost.exe	33
PID 2296 wrote to memory of 2804	2296	svchost.exe	33
PID 2296 wrote to memory of 2804	2296	svchost.exe	33
PID 2296 wrote to memory of 2804	2296	svchost.exe	33
PID 2296 wrote to memory of 2240	2296	svchost.exe	34
PID 2296 wrote to memory of 2240	2296	svchost.exe	34
PID 2296 wrote to memory of 2240	2296	svchost.exe	34
PID 2296 wrote to memory of 2240	2296	svchost.exe	34
PID 2296 wrote to memory of 2400	2296	svchost.exe	37
PID 2296 wrote to memory of 2400	2296	svchost.exe	37
PID 2296 wrote to memory of 2400	2296	svchost.exe	37
PID 2296 wrote to memory of 2400	2296	svchost.exe	37

C:\Users\Admin\AppData\Local\Temp\b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe
"C:\Users\Admin\AppData\Local\Temp\b13b713fa41afd38f5756e39d2af6da7bdb43ac107afe8683d0f9b719eb7f6c8N.exe"
1⤵
- Loads dropped DLL
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2260
- \??\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
  - 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:2004
- - \??\c:\windows\system\spoolsv.exe
    c:\windows\system\spoolsv.exe SE
    3⤵
    - Executes dropped EXE
    - Loads dropped DLL
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2168
  - - \??\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
      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:2296
    - - \??\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:2804
    - - 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:2240
    - - 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:2400

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
dbe9ac75c3dedd3edd7417a821e995a6

SHA1
6a7c71a6754d07f7ca03bfa7af6a06effcb89f48

SHA256
def49d2639aac61415ba015e67704e61156093cc7135a71361a2aa2da3d08ca5

SHA512
a90965b00a2f1f26b4b98e0fd379e08bf1dc11e5a3b7145a04d8a4b90df24af37bdec6d4666f8b873060f6cfc4b85d0d6d0bfeff6e568981c6a2f0455ef42255

Download Submit
\Windows\system\explorer.exe

Filesize
70KB

MD5
2c89128ca279e48de76c1666e68619b6

SHA1
cd98d6b4403d361d4998f801404f2913452f7a7b

SHA256
c6ec4efe0921f3a7ae70a9d9eb3dac83a9174b765bf5fa9afacddce69a9b84c7

SHA512
33325090248d7611b199357f9a28dc443791c3162593a7c52b9dc0bdcd77eaf32eb4f602995d9bc6b1e678dafb430316c738fcb7dc21f828b284d78274c1029e

Download Submit
\Windows\system\spoolsv.exe

Filesize
69KB

MD5
65ac7e331580d576da5cb36648cd8cb9

SHA1
7e28fa9aea5506acce2d3f0a4d15120022e2351f

SHA256
156c7ca41e0e7ebe0d4ae97f4fc78ca7bda84d39dbf061a4c39105f94e54293c

SHA512
fb73985c63ee3dce87536d61e3acbde35118bdd1d534baaa9fefb59c0ba56866e67e81812ade1279a3a07735feeda5e48e8dc69e754baab176e3cd5088e7f836

Download Submit
\Windows\system\svchost.exe

Filesize
69KB

MD5
3c39b317aab75188181e75b7b8424f30

SHA1
6f5f08a3f5f8d5c30c1ec476095757c6b4e8b688

SHA256
69439db48f40770e3af93bb112fc2b41780ab9eca390651efd91ff50c55d8d15

SHA512
b943f36d423d65de17b083cf7727de248ba87000a6380531a2ba6ab89a2aa145fa2a70c8271db784b164abcb35ae73cccf590e12ff262b4a1f52d6c0e05ddf38

Download Submit
memory/2004-77-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2004-27-0x0000000003250000-0x0000000003284000-memory.dmp

Filesize
208KB

Download
memory/2004-65-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2004-63-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2168-59-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2168-30-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2260-13-0x0000000002700000-0x0000000002734000-memory.dmp

Filesize
208KB

Download
memory/2260-61-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2260-12-0x0000000002700000-0x0000000002734000-memory.dmp

Filesize
208KB

Download
memory/2260-48-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2260-0-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2296-64-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download
memory/2804-55-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

Download