Analysis Overview
SHA256
4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2
Threat Level: Likely malicious
The file 4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2 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 registry class
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-03-21 19:45
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-03-21 19:45
Reported
2024-03-21 19:47
Platform
win7-20240221-en
Max time kernel
142s
Max time network
121s
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\{52EB730C-730C-2EB7-30C9-D962EB740D95} | 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\{0C851EA6-1DA6-C851-DA63-730C951EA73F} | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\SysWOW64\NOOP.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\NOOP.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Windows\SysWOW64\IIIJ.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\IIIJ.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32\ThreadingModel = "Apartment" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32 | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32 | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32\ = "C:\\Windows\\SysWow64\\NOOP.dll" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F} | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32\ = "C:\\Windows\\SysWow64\\IIIJ.dll" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32\ThreadingModel = "Apartment" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95} | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 1192 wrote to memory of 2944 | 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\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1
C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1
Network
Files
memory/2944-0-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-1-0x0000000077BF0000-0x0000000077BF1000-memory.dmp
C:\Windows\SysWOW64\NOOP.dll
| MD5 | 78f82703c28efdb3a11c140b987557dc |
| SHA1 | 82e6ca3c2b56f5132943f8c4f491aecda64276aa |
| SHA256 | 074f60a48f770aae040277f84995fa9d10cf45002baf4641d1a3ed52dc4d6daf |
| SHA512 | db31097d3cb172ff1905ca54637d5082291ebf0cda27b770b8a476545a428934cf3338f5e18a1e66ffa21b93fe4e8df394aa0f98026948ecc0790f51332eb661 |
memory/2944-10-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-11-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-12-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-13-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-14-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-15-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-16-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-17-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-18-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-19-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-20-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-21-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-22-0x0000000000160000-0x00000000001BC000-memory.dmp
memory/2944-23-0x0000000000160000-0x00000000001BC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-03-21 19:45
Reported
2024-03-21 19:47
Platform
win10v2004-20231215-en
Max time kernel
141s
Max time network
122s
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\{852DA730-963F-41EA-63FB-FC952FB741DA} | 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\{2FC841DA-30D9-EB84-0DA6-963FC952EB74} | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\SysWOW64\WRMW.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\WRMW.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File created | C:\Windows\SysWOW64\CXSB.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\CXSB.dll | C:\Windows\SysWOW64\rundll32.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32\ = "C:\\Windows\\SysWow64\\CXSB.dll" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32 | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32\ = "C:\\Windows\\SysWow64\\WRMW.dll" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA} | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\ | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74} | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32\ThreadingModel = "Apartment" | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32 | C:\Windows\SysWOW64\rundll32.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32\ThreadingModel = "Apartment" | C:\Windows\SysWOW64\rundll32.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2244 wrote to memory of 4332 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 2244 wrote to memory of 4332 | N/A | C:\Windows\system32\rundll32.exe | C:\Windows\SysWOW64\rundll32.exe |
| PID 2244 wrote to memory of 4332 | 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\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1
C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 138.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 232.168.11.51.in-addr.arpa | udp |
| NL | 52.142.223.178:80 | tcp | |
| US | 8.8.8.8:53 | 183.142.211.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 103.169.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 186.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 29.243.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 196.178.17.96.in-addr.arpa | udp |
Files
memory/4332-0-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-1-0x0000000077784000-0x0000000077785000-memory.dmp
C:\Windows\SysWOW64\WRMW.dll
| MD5 | d68d219b607eefc8bfe7fc6dbfca9b3c |
| SHA1 | 6a364f40df329f80c6107ec207ff41722198d0c8 |
| SHA256 | c1dfe969a71f81c5d87ab700e28413fb0cb30d30d15d65c242dbd50c1b772ebf |
| SHA512 | 89f7c9fc6282c6d848cb4a062c4afc872c6bc33a166bb3eed6196d24965a7fbf4441f4f2e6b739526c013eee5a9e8a0da912f5cf2272499803b71152a92a65b2 |
memory/4332-12-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-13-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-14-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-15-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-16-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-17-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-18-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-19-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-20-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-21-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-22-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-23-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-24-0x0000000000630000-0x000000000068C000-memory.dmp
memory/4332-25-0x0000000000630000-0x000000000068C000-memory.dmp