Malware Analysis Report

2025-01-18 21:29

Sample ID 240321-py1vgadc9v
Target dba838199351cc0c1ccbf351b32b1fb2
SHA256 2b58c2f317105b85a2a87419f8654e6977aa6369e16c38ee26ce4d177dcb86c7
Tags
adware persistence stealer
score
8/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
8/10

SHA256

2b58c2f317105b85a2a87419f8654e6977aa6369e16c38ee26ce4d177dcb86c7

Threat Level: Likely malicious

The file dba838199351cc0c1ccbf351b32b1fb2 was found to be: Likely malicious.

Malicious Activity Summary

adware persistence stealer

Modifies Shared Task Scheduler registry keys

Installs/modifies Browser Helper Object

Drops file in System32 directory

Unsigned PE

Modifies Internet Explorer settings

Modifies registry class

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-21 12:45

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-21 12:45

Reported

2024-03-21 12:47

Platform

win7-20240221-en

Max time kernel

150s

Max time network

123s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

Signatures

Modifies Shared Task Scheduler registry keys

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\SharedTaskScheduler\{47BE36AD-58D0-038B-259C-BE36AD159C03} C:\Windows\SysWOW64\rundll32.exe N/A

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{E159D047-F37A-AE25-CF36-59D047CF36AE} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{E159D047-F37A-AE25-CF36-59D047CF36AE}\ C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\GDLJROWT.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\GDLJROWT.dll C:\Windows\SysWOW64\rundll32.exe N/A
File created C:\Windows\SysWOW64\MJROXUCZ.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\MJROXUCZ.dll C:\Windows\SysWOW64\rundll32.exe N/A

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Internet Explorer\New Windows\Allow C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Internet Explorer\New Windows\Allow\www.google.cn C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3452737119-3959686427-228443150-1000\Software\Microsoft\Internet Explorer\New Windows\Allow\www.baidu.com C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{47BE36AD-58D0-038B-259C-BE36AD159C03}\InprocServer32\ = "C:\\Windows\\SysWow64\\MJROXUCZ.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{47BE36AD-58D0-038B-259C-BE36AD159C03}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{E159D047-F37A-AE25-CF36-59D047CF36AE}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{47BE36AD-58D0-038B-259C-BE36AD159C03}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{E159D047-F37A-AE25-CF36-59D047CF36AE}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{E159D047-F37A-AE25-CF36-59D047CF36AE}\InprocServer32\ = "C:\\Windows\\SysWow64\\GDLJROWT.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{47BE36AD-58D0-038B-259C-BE36AD159C03} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{47BE36AD-58D0-038B-259C-BE36AD159C03}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{E159D047-F37A-AE25-CF36-59D047CF36AE} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{E159D047-F37A-AE25-CF36-59D047CF36AE}\ C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2844 wrote to memory of 2008 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

Network

N/A

Files

memory/2008-0-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-1-0x0000000077100000-0x0000000077101000-memory.dmp

memory/2008-6-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-7-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-8-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-9-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-10-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-11-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-12-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-13-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-14-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-15-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-16-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-17-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-18-0x0000000000200000-0x0000000000261000-memory.dmp

memory/2008-19-0x0000000000200000-0x0000000000261000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-21 12:45

Reported

2024-03-21 12:47

Platform

win10v2004-20240226-en

Max time kernel

149s

Max time network

151s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

Signatures

Modifies Shared Task Scheduler registry keys

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D} C:\Windows\SysWOW64\rundll32.exe N/A

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\ C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\DLTBJRZH.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\DLTBJRZH.dll C:\Windows\SysWOW64\rundll32.exe N/A
File created C:\Windows\SysWOW64\JRZHPXFN.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\JRZHPXFN.dll C:\Windows\SysWOW64\rundll32.exe N/A

Modifies Internet Explorer settings

adware spyware
Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Software\Microsoft\Internet Explorer\New Windows\Allow C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\SOFTWARE\Microsoft\Internet Explorer\New Windows\Allow\www.google.cn C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\SOFTWARE\Microsoft\Internet Explorer\New Windows\Allow\www.baidu.com C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32\ = "C:\\Windows\\SysWow64\\JRZHPXFN.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32\ = "C:\\Windows\\SysWow64\\DLTBJRZH.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D} C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1068 wrote to memory of 3320 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1068 wrote to memory of 3320 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1068 wrote to memory of 3320 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 2.181.190.20.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 79.121.231.20.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.in-addr.arpa udp
US 8.8.8.8:53 100.5.17.2.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 188.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 42.56.20.217.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 35.56.20.217.in-addr.arpa udp
US 8.8.8.8:53 204.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp

Files

memory/3320-0-0x0000000076F54000-0x0000000076F55000-memory.dmp

memory/3320-5-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-6-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-7-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-8-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-9-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-10-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-11-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-12-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-13-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-14-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-15-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-16-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-17-0x0000000000400000-0x0000000000461000-memory.dmp

memory/3320-18-0x0000000000400000-0x0000000000461000-memory.dmp