Resubmissions
12-11-2021 18:04
211112-wnzb8aahhm 1019-11-2020 10:08
201119-rhwlt38jrx 1018-11-2020 17:26
201118-htd4fq29va 10Analysis
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max time kernel
304s -
max time network
448s -
platform
windows10_x64 -
resource
win10v20201028 -
submitted
19-11-2020 10:08
General
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Target
default.exe
Score
10/10
Malware Config
Extracted
Path
C:\!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT
Family
buran
Ransom Note
!!! ALL YOUR FILES ARE ENCRYPTED !!!
All your files, documents, photos, databases and other important files are encrypted.
You are not able to decrypt it by yourself! The only method of recovering files is to purchase an unique private key.
Only we can give you this key and only we can recover your files.
To be sure we have the decryptor and it works you can send an email: [email protected] or [email protected] and decrypt one file for free.
But this file should be of not valuable!
Do you really want to restore your files?
Write to email: [email protected]
Reserved email: [email protected]
Your personal ID: 13A-721-97F
Attention!
* Do not rename encrypted files.
* Do not try to decrypt your data using third party software, it may cause permanent data loss.
* Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.
Signatures
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Buran
Ransomware-as-a-service based on the VegaLocker family first identified in 2019.
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Deletes shadow copies 2 TTPs
Ransomware often targets backup files to inhibit system recovery.
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Executes dropped EXE 2 IoCs
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Deletes itself 1 IoCs
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Adds Run key to start application 2 TTPs 2 IoCs
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Enumerates connected drives 3 TTPs 24 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
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Legitimate hosting services abused for malware hosting/C2 1 TTPs
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Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
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Drops file in Program Files directory 64 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Interacts with shadow copies 2 TTPs 1 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
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Modifies system certificate store 2 TTPs 2 IoCs
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Suspicious use of AdjustPrivilegeToken 50 IoCs
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Suspicious use of WriteProcessMemory 48 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\default.exe"C:\Users\Admin\AppData\Local\Temp\default.exe"1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -start2⤵
- Executes dropped EXE
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe"C:\Users\Admin\AppData\Roaming\Microsoft\Windows\csrss.exe" -agent 03⤵
- Executes dropped EXE
- Drops file in Program Files directory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures3⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C bcdedit /set {default} recoveryenabled no3⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C wbadmin delete catalog -quiet3⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C wbadmin delete systemstatebackup3⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C wbadmin delete systemstatebackup -keepversions:03⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C wbadmin delete backup3⤵
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C wmic shadowcopy delete3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\Wbem\WMIC.exewmic shadowcopy delete4⤵
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /C vssadmin delete shadows /all /quiet3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\vssadmin.exevssadmin delete shadows /all /quiet4⤵
- Interacts with shadow copies
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C:\Windows\SysWOW64\notepad.exenotepad.exe3⤵
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C:\Windows\SysWOW64\notepad.exenotepad.exe2⤵
- Deletes itself
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
4KB
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Filesize
4KB
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