Analysis Overview
SHA256
e5811a9f17c42d1e9618879c68ec9fa2fbdf76a54530e8c5ee27044c5b44c50e
Threat Level: Known bad
The file 37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe was found to be: Known bad.
Malicious Activity Summary
Chaos Ransomware
Chaos family
Chaos
Renames multiple (195) files with added filename extension
Renames multiple (174) files with added filename extension
Drops startup file
Reads user/profile data of web browsers
Checks computer location settings
Drops desktop.ini file(s)
Unsigned PE
Enumerates physical storage devices
Suspicious use of AdjustPrivilegeToken
Opens file in notepad (likely ransom note)
Suspicious behavior: AddClipboardFormatListener
Suspicious use of WriteProcessMemory
Suspicious behavior: EnumeratesProcesses
Modifies registry class
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2023-09-22 16:05
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
2023-09-22 16:05
Reported
2023-09-22 16:07
Platform
win7-20230831-en
Max time kernel
122s
Max time network
125s
Command Line
Signatures
Chaos
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Renames multiple (195) 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 2876 wrote to memory of 1396 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 2876 wrote to memory of 1396 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 2876 wrote to memory of 1396 | 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/2876-0-0x0000000000E30000-0x0000000000F24000-memory.dmp
memory/2876-1-0x000007FEF63B0000-0x000007FEF6D9C000-memory.dmp
memory/2876-2-0x000000001AEA0000-0x000000001AF20000-memory.dmp
C:\Users\Admin\Documents\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
memory/2876-444-0x000007FEF63B0000-0x000007FEF6D9C000-memory.dmp
memory/2876-445-0x000000001AEA0000-0x000000001AF20000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2023-09-22 16:05
Reported
2023-09-22 16:07
Platform
win10v2004-20230915-en
Max time kernel
150s
Max time network
155s
Command Line
Signatures
Chaos
Chaos Ransomware
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Renames multiple (174) files with added filename extension
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-3027552071-446050021-1254071215-1000\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-1-5-21-3027552071-446050021-1254071215-1000_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 |
| Token: SeManageVolumePrivilege | N/A | C:\Windows\System32\svchost.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4784 wrote to memory of 3552 | N/A | C:\Users\Admin\AppData\Local\Temp\Device\HarddiskVolume4\Users\Admin\Desktop\37ca1cfa1f30b57408d3e855f98f9e5fd6900b23643bbc0c6163a875edf00b60_ransomware.exe | C:\Windows\system32\NOTEPAD.EXE |
| PID 4784 wrote to memory of 3552 | 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
C:\Windows\system32\rundll32.exe
"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k UnistackSvcGroup
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 | 64.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 8.3.197.209.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 208.194.73.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 135.1.85.104.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 59.128.231.4.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 146.78.124.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 160.252.72.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 1.208.79.178.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 2.136.104.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 254.177.238.8.in-addr.arpa | udp |
| US | 52.111.227.13:443 | tcp | |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
Files
memory/4784-0-0x0000000000400000-0x00000000004F4000-memory.dmp
memory/4784-1-0x00007FFA5D380000-0x00007FFA5DE41000-memory.dmp
memory/4784-2-0x000000001B3B0000-0x000000001B3C0000-memory.dmp
C:\Users\Admin\Documents\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
memory/4784-399-0x00007FFA5D380000-0x00007FFA5DE41000-memory.dmp
C:\Users\Admin\AppData\Roaming\PLEASEREAD.txt
| MD5 | 929ad339c51b2a3b1bd4b3b7acf47379 |
| SHA1 | b555580144c617a5950aa55a800b09decb5e4c80 |
| SHA256 | b94bd148bc968f4e6c70f8479a16588424d587812cd17e9b2cc4ba8766d1b5d8 |
| SHA512 | 0319b0c3a4b7223a489b7883b9a6d5f6c51fc0285a96940635b0247e0162b7a6bcc48c5c91b0896e1d676b5bbeac5e8ada4eb200b847cda1a33efc31be020dda |
memory/4784-402-0x000000001B3B0000-0x000000001B3C0000-memory.dmp
memory/3416-403-0x0000021D997A0000-0x0000021D997B0000-memory.dmp
memory/3416-419-0x0000021D998A0000-0x0000021D998B0000-memory.dmp
memory/3416-435-0x0000021DA1C10000-0x0000021DA1C11000-memory.dmp
memory/3416-437-0x0000021DA1C40000-0x0000021DA1C41000-memory.dmp
memory/3416-438-0x0000021DA1C40000-0x0000021DA1C41000-memory.dmp
memory/3416-439-0x0000021DA1D50000-0x0000021DA1D51000-memory.dmp