9c79744bb25f789fc87639a319d7b4e2baddeb76435076b75903783e31b65296

General

Target
8b761d490b00f36e21c90676a04d099d.exe
Size 8KB
Sample240203-fm7dfacbbp
SHA256 9c79744bb25f789fc87639a319d7b4e2baddeb76435076b75903783e31b65296
MD5 8b761d490b00f36e21c90676a04d099d
SHA1 6a0a379767100ddeb407d5e08cbc0611481e9bc4
SHA512 aa71a15e239f8616f936cd6e25b81793ac522518a7e033f1dde84e220feaa0d9f5b609f6045676ad6805c4f1ab9cdc751ba4e0d3112e9c650355a0b8bc276b87
SSDEEP 192:g2TCTTytOWDzw9rPcnj5WMlVETbRwHjX2tLEKj:pCTbWY9rEPlVE2HT2t4+
MD5 SHA1 SHA512 SSDEEP

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"	8b761d490b00f36e21c90676a04d099d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,"	8b761d490b00f36e21c90676a04d099d.exe

Drops file in Drivers directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\drivers\spools.exe	8b761d490b00f36e21c90676a04d099d.exe
File opened for modification	C:\Windows\SysWOW64\drivers\spools.exe	8b761d490b00f36e21c90676a04d099d.exe

Sets service image path in registry 2 TTPs 1 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"	8b761d490b00f36e21c90676a04d099d.exe

Modifies system executable filetype association 2 TTPs 1 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\ = "C:\\Windows\\SysWow64\\drivers\\spools.exe \"%1\" %*"	8b761d490b00f36e21c90676a04d099d.exe

UPX packed file 3 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5024-0-0x0000000000400000-0x000000000040F000-memory.dmp	upx
behavioral2/files/0x000a0000000231fb-5.dat	upx
behavioral2/memory/5024-6-0x0000000000400000-0x000000000040F000-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\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\cftmon.exe"	8b761d490b00f36e21c90676a04d099d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	8b761d490b00f36e21c90676a04d099d.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\cftmon.exe"	8b761d490b00f36e21c90676a04d099d.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\spools.exe"	8b761d490b00f36e21c90676a04d099d.exe

Enumerates connected drives 3 TTPs 12 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)	\??\N:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\Q:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\G:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\J:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\M:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\K:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\L:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\O:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\P:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\E:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\H:	8b761d490b00f36e21c90676a04d099d.exe
File opened (read-only)	\??\I:	8b761d490b00f36e21c90676a04d099d.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	reg.exe
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

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"	8b761d490b00f36e21c90676a04d099d.exe

Modifies registry class 1 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\drivers\\spools.exe \"%1\" %*"	8b761d490b00f36e21c90676a04d099d.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 5024 wrote to memory of 1592	5024	8b761d490b00f36e21c90676a04d099d.exe	84
PID 5024 wrote to memory of 1592	5024	8b761d490b00f36e21c90676a04d099d.exe	84
PID 5024 wrote to memory of 1592	5024	8b761d490b00f36e21c90676a04d099d.exe	84

C:\Users\Admin\AppData\Local\Temp\8b761d490b00f36e21c90676a04d099d.exe
"C:\Users\Admin\AppData\Local\Temp\8b761d490b00f36e21c90676a04d099d.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 use of WriteProcessMemory
PID:5024
- C:\Windows\SysWOW64\reg.exe
  reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects" /f
  2⤵
  - Installs/modifies Browser Helper Object
  PID:1592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

Browser Extensions

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

4

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

2

T1547.004

Event Triggered Execution

1

T1546

Change Default File Association

1

T1546.001

Defense Evasion

Modify Registry

6

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

spools.exe

Path C:\Windows\SysWOW64\drivers\spools.exe
Size 30KB
SHA256 072adac069c160c0157876190ff3e4d6280a31484cd230a3c3a13b42300b955b
MD5 3bd47afa46bdeb7ca3cad1125d866a61
SHA1 e2e5e9e1fdf99d379ac46c407697fb3b1e356e69
SHA512 90c4be71b75efd4b029ae2b9bec784079689f08e1ad2a156a5b47a367964423ef83b95086bb0279528fd9cf79a8eadd21066213a23cbe5a31a30a30c71b945d3
SSDEEP 768:pCWYqVHCymcs0i/ZSdcwDNUBQoytvO094SVrNeuf/ZQbge30rz:QWYSTViYTOQjtf9zabH4
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/5024-0-0x0000000000400000-0x000000000040F000-memory.dmp

Download

memory/5024-6-0x0000000000400000-0x000000000040F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads