Analysis Overview
SHA256
4bb109c322cbd7afdf806bc9bff5e3a57577651e3fd5abe673f2401674208bae
Threat Level: Known bad
The file 37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe was found to be: Known bad.
Malicious Activity Summary
Chaos family
Chaos Ransomware
Chaos
Renames multiple (201) files with added filename extension
Renames multiple (209) files with added filename extension
Drops startup file
Reads user/profile data of web browsers
Checks computer location settings
Drops desktop.ini file(s)
Enumerates physical storage devices
Unsigned PE
Modifies registry class
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
Opens file in notepad (likely ransom note)
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2023-09-25 10:00
Signatures
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Chaos family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2023-09-25 10:00
Reported
2023-09-25 10:03
Platform
win7-20230831-en
Max time kernel
120s
Max time network
124s
Command Line
Signatures
Chaos
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Renames multiple (209) files with added filename extension
Drops startup file
| Description | Indicator | Process | Target |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PLEASEREAD.txt | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Reads user/profile data of web browsers
Drops desktop.ini file(s)
Enumerates physical storage devices
Opens file in notepad (likely ransom note)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\NOTEPAD.EXE | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 2916 wrote to memory of 2716 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 2916 wrote to memory of 2716 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 2916 wrote to memory of 2716 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
Processes
C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe
"C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe"
C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
Network
Files
memory/2916-0-0x0000000001070000-0x0000000001164000-memory.dmp
memory/2916-1-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp
memory/2916-2-0x000000001AEB0000-0x000000001AF30000-memory.dmp
C:\Users\Admin\Documents\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
memory/2916-452-0x000007FEF51A0000-0x000007FEF5B8C000-memory.dmp
memory/2916-453-0x000000001AEB0000-0x000000001AF30000-memory.dmp
C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
Analysis: behavioral2
Detonation Overview
Submitted
2023-09-25 10:00
Reported
2023-09-25 10:03
Platform
win10v2004-20230915-en
Max time kernel
138s
Max time network
146s
Command Line
Signatures
Chaos
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Renames multiple (201) files with added filename extension
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Drops startup file
| Description | Indicator | Process | Target |
| File opened for modification | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\desktop.ini | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
| File created | C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\PLEASEREAD.txt | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Reads user/profile data of web browsers
Drops desktop.ini file(s)
Enumerates physical storage devices
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-1574508946-349927670-1185736483-1000_Classes\Local Settings | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Opens file in notepad (likely ransom note)
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\NOTEPAD.EXE | N/A |
Suspicious behavior: AddClipboardFormatListener
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1536 wrote to memory of 2272 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 1536 wrote to memory of 2272 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
Processes
C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe
"C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe"
C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 1.202.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 158.240.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 57.169.31.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 59.128.231.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.136.104.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.57.101.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 86.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 206.23.85.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 126.211.247.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 90.65.42.20.in-addr.arpa | udp |
Files
memory/1536-0-0x0000000000AD0000-0x0000000000BC4000-memory.dmp
memory/1536-1-0x00007FFDA1540000-0x00007FFDA2001000-memory.dmp
memory/1536-2-0x000000001B9D0000-0x000000001B9E0000-memory.dmp
C:\Users\Admin\Documents\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
memory/1536-185-0x00007FFDA1540000-0x00007FFDA2001000-memory.dmp
memory/1536-404-0x000000001B9D0000-0x000000001B9E0000-memory.dmp
C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |