b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac

Analysis

max time kernel
107s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
12/03/2024, 01:19

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General

Target

b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Size

284KB
MD5

aa32fd5e4d9100a5b2b3fc7387921919
SHA1

d6a33c9679c63c7be9224c6b148b974fe1df5164
SHA256

b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac
SHA512

662040826a4f20c485dac2e204b0ea3b6399aaf17c0e23dc1031a1adc07872e035365c6636e3e24adeb7f6785abe58e1bfa59c10083aed01dac6a163b2811f1b
SSDEEP

3072:rPL+rqBloJBz3f7z3VCeKeHWMMDM45xx/bgbntDy1:TL+rqBloJJn3VvK6Wr7xpbSo

Score

10^/10

adware persistence stealer 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 = "Explorer.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

UPX dump on OEP (original entry point) 6 IoCs

resource	yara_rule
behavioral2/memory/464-0-0x0000000000400000-0x0000000000430000-memory.dmp	UPX
behavioral2/files/0x000300000001e806-5.dat	UPX
behavioral2/memory/464-8-0x0000000000400000-0x0000000000430000-memory.dmp	UPX
behavioral2/files/0x000400000001e806-10.dat	UPX
behavioral2/files/0x000300000001e809-9.dat	UPX
behavioral2/memory/4740-17-0x0000000000400000-0x0000000000430000-memory.dmp	UPX

Drops file in Drivers directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\drivers\spools.exe	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File created	C:\Windows\SysWOW64\drivers\spools.exe	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened for modification	C:\Windows\SysWOW64\drivers\spools.exe	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File created	C:\Windows\SysWOW64\drivers\spools.exe	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Sets service image path in registry 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Schedule\ImagePath = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Schedule\ImagePath = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Modifies system executable filetype association 2 TTPs 2 IoCs

persistence

Modify Registry

T1112

Change Default File Association

T1546.001

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/464-0-0x0000000000400000-0x0000000000430000-memory.dmp	upx
behavioral2/files/0x000300000001e806-5.dat	upx
behavioral2/memory/464-8-0x0000000000400000-0x0000000000430000-memory.dmp	upx
behavioral2/files/0x000400000001e806-10.dat	upx
behavioral2/files/0x000300000001e809-9.dat	upx
behavioral2/memory/4740-17-0x0000000000400000-0x0000000000430000-memory.dmp	upx

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\cftmon.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\cftmon.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\cftmon.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\cftmon.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-609813121-2907144057-1731107329-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Enumerates connected drives 3 TTPs 38 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\K:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\S:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\U:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\X:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\G:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\J:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\I:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\P:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\M:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\T:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\U:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\O:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\H:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\I:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\Q:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\S:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\X:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\E:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\G:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\H:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\R:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\V:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\R:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\T:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\W:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\E:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\L:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\L:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\N:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\V:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\N:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\P:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\W:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\J:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\Q:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\M:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\K:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
File opened (read-only)	\??\O:	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Installs/modifies Browser Helper Object 2 TTPs 3 IoCs

BHOs are DLL modules which act as plugins for Internet Explorer.

stealer adware

Modify Registry

T1112

Browser Extensions

T1176

description	ioc	Process
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{1FD49718-1D00-4B19-AF5F-070AF6D5D54C}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA}	reg.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects	reg.exe

Modifies WinLogon 2 TTPs 1 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\UIHost = "logonui.exe"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Modifies registry class 2 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "\"%1\" %*"	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
4740	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
4740	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 464 wrote to memory of 3512	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	91
PID 464 wrote to memory of 3512	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	91
PID 464 wrote to memory of 3512	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	91
PID 464 wrote to memory of 4740	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	93
PID 464 wrote to memory of 4740	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	93
PID 464 wrote to memory of 4740	464	b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe	93

C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
"C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe"
1⤵
- Modifies WinLogon for persistence
- Drops file in Drivers directory
- Sets service image path in registry
- Modifies system executable filetype association
- Adds Run key to start application
- Enumerates connected drives
- Modifies WinLogon
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:464
- C:\Windows\SysWOW64\reg.exe
  reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects" /f
  2⤵
  - Installs/modifies Browser Helper Object
  PID:3512
- C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
  C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
  2⤵
  - Drops file in Drivers directory
  - Sets service image path in registry
  - Modifies system executable filetype association
  - Adds Run key to start application
  - Enumerates connected drives
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:4740
- - C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
    C:\Users\Admin\AppData\Local\Temp\b4ac369e43a358a3ff1653a8c8f95d1836b5a1583e5f455f77c0904f92343eac.exe
    3⤵
    PID:3500

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

Browser Extensions

T1176

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\Local Settings\Application Data\cftmon.exe

Filesize
291KB

MD5
d1b0e8326219a6992d30e634e648cfbe

SHA1
5d2dc694b991592db2120e62beabec2f32c606b8

SHA256
db4e4a237ba7ca02b66bfbaffc190eee541283f09e87681cdced3ca5e3f23a49

SHA512
98b71292abfdb877d840338c23b55f96c5809eb5d3e05343f35fbb42d825e87ad179c1d2aae0ad8d7496b5820109063806a94277173e0db3b099e08d8ca6aa65

Download Submit
C:\Windows\SysWOW64\drivers\spools.exe

Filesize
308KB

MD5
6dbcaa5c7974edd462b912f4a5ed75c5

SHA1
ee211d0f3b9e8c2649c1b86a7b411a605577b5b1

SHA256
26c5e62abab8c3b2c23e26eb7937852e0c9fff330a78b3afae89069ff0e3a73b

SHA512
080e5150acc7070c9571639a23cfa8ff6bde66694eb6dc617382b951eb2d2209b097adfe49c98400b5e69a6671fa6942a9f6345caa33e605f822776648bf1827

Download Submit
C:\Windows\SysWOW64\drivers\spools.exe

Filesize
284KB

MD5
39852a6e1a0ba6a61bff9c787f47ee28

SHA1
6c941d74c2d5a268c464d6f0cddfca87166597c2

SHA256
2d0ad2defa6eeb9d72db548b16cd4273cd022a146d0425933d22d7dd19ebfc51

SHA512
c263b0b91e9125969b6f888108db4dda6814743cd6f9bf1f320fab7cfbe819b6af4a25067b305cd04f2320d2a6f03a95b5fe544c2fd86bd4e89bf90776696b75

Download Submit
\??\c:\stop

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
memory/464-0-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/464-8-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

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memory/4740-17-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

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