Analysis Overview
SHA256
2b58c2f317105b85a2a87419f8654e6977aa6369e16c38ee26ce4d177dcb86c7
Threat Level: Likely malicious
The file dba838199351cc0c1ccbf351b32b1fb2 was found to be: Likely malicious.
Malicious Activity Summary
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
Enterprise Matrix V15
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
Signatures
Modifies Shared Task Scheduler registry keys
| 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
| 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
| 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
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
Signatures
Modifies Shared Task Scheduler registry keys
| 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
| 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
| 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