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Figure 1 below shows the standard attack lifecycle observed with Black Basta ransomware. | [] | Threat Assessment Black Basta Ransomware |
Black Basta attack lifecycle based on Unit 42 incident response cases. | [] | Threat Assessment Black Basta Ransomware |
Technical Details Black Basta is written in C++ and is cross-platform ransomware that impacts both Windows and Linux systems. | [] | Threat Assessment Black Basta Ransomware |
In June 2022, a VMware ESXi variant of Black Basta was observed targeting virtual machines running on enterprise Linux servers. | [] | Threat Assessment Black Basta Ransomware |
The ransomware includes anti-analysis techniques that attempt to detect code emulation or sandboxing to avoid virtual/analysis machine environments. | [] | Threat Assessment Black Basta Ransomware |
It also supports the command line argument -forcepath that is used to encrypt files in a specified directory. | [
"T1059.003"
] | Threat Assessment Black Basta Ransomware |
Otherwise, the entire system, except for certain critical directories, is encrypted. | [] | Threat Assessment Black Basta Ransomware |
The ransomware spawns a mutex with a string of dsajdhas.0 to ensure a single instance of the malware is running at a time. | [] | Threat Assessment Black Basta Ransomware |
Then it will iterate through the entire file system, encrypting files with a file extension of .basta. | [
"T1083"
] | Threat Assessment Black Basta Ransomware |
Black Basta ransomware encrypts users’ data through a combination of ChaCha20 and RSA-4096. | [] | Threat Assessment Black Basta Ransomware |
To speed up the encryption process, the ransomware encrypts in chunks of 64 bytes, with 128 bytes of data remaining unencrypted between the encrypted regions. | [] | Threat Assessment Black Basta Ransomware |
The ransomware also attempts to delete shadow copies and other backups of files using vssadmin.exe, a command-line tool that manages Volume Shadow Copy Service (VSS), which captures and copies stable images for backups on running systems. | [] | Threat Assessment Black Basta Ransomware |
It writes the Random-letters.ico and Random-letters.jpg files to the %TEMP% directory. | [] | Threat Assessment Black Basta Ransomware |
The .jpg file is leveraged to overwrite the desktop background and appears as follows: Figure 2. | [] | Threat Assessment Black Basta Ransomware |
Black Basta desktop wallpaper. | [] | Threat Assessment Black Basta Ransomware |
It adds a custom icon to the registry, corresponding to the .basta icon, which is shown in Figure 3. | [
"T1112"
] | Threat Assessment Black Basta Ransomware |
Black Basta icon. | [] | Threat Assessment Black Basta Ransomware |
It will then boot the system in safe mode and proceed to encrypt files. | [] | Threat Assessment Black Basta Ransomware |
Following successful encryption, the file’s extension is changed to .basta | [] | Threat Assessment Black Basta Ransomware |
and the ransomware will write numerous instances of readme.txt, which contains the following ransom note: Figure 4. | [] | Threat Assessment Black Basta Ransomware |
Black Basta ransom note. | [] | Threat Assessment Black Basta Ransomware |
Tactics, Techniques and Procedures We have observed Black Basta affiliates leveraging the following TTPs: Tactic / Technique Notes TA0001 Initial Access T1566.001. | [] | Threat Assessment Black Basta Ransomware |
Phishing: | [] | Threat Assessment Black Basta Ransomware |
Spear phishing Attachment Victims receive spear phishing emails with attached malicious zip files - typically password protected. | [
"T1566.001"
] | Threat Assessment Black Basta Ransomware |
That contains malicious doc including .doc, .pdf, .xls TA0002 Execution T1569.002. | [] | Threat Assessment Black Basta Ransomware |
System Services: Service Execution Black Basta has installed and used PsExec to execute payloads on remote hosts. | [
"T1569.002"
] | Threat Assessment Black Basta Ransomware |
T1047. | [] | Threat Assessment Black Basta Ransomware |
Windows Management Instrumentation Utilizes Invoke-TotalExec to push out the ransomware binary. T1059.001. | [] | Threat Assessment Black Basta Ransomware |
Command and Scripting Interpreter: | [] | Threat Assessment Black Basta Ransomware |
PowerShell Black Basta has encoded PowerShell scripts to download additional scripts. | [
"T1027",
"T1105"
] | Threat Assessment Black Basta Ransomware |
TA0003 Persistence T1136. | [] | Threat Assessment Black Basta Ransomware |
Create Account Black Basta threat actors created accounts with names such as temp, r, or admin. T1098. | [] | Threat Assessment Black Basta Ransomware |
Account Manipulation Added newly created accounts to the administrators' group to maintain elevated access. T1543.003. | [] | Threat Assessment Black Basta Ransomware |
Create or Modify System Process: | [] | Threat Assessment Black Basta Ransomware |
Windows Service Creates benign-looking services for the ransomware binary. T1574.001. | [
"T1543.003"
] | Threat Assessment Black Basta Ransomware |
Hijack Execution Flow: DLL Search Order Hijacking Black Basta used Qakbot, which has the ability to exploit Windows 7 Calculator to execute malicious payloads. | [] | Threat Assessment Black Basta Ransomware |
TA0004 Privilege Escalation T1484.001. | [] | Threat Assessment Black Basta Ransomware |
Domain Policy Modification: | [] | Threat Assessment Black Basta Ransomware |
Group Policy Modification Black Basta can modify group policy for privilege escalation and defense evasion. T1574.001. | [
"T1484.001"
] | Threat Assessment Black Basta Ransomware |
Hijack Execution Flow: DLL Search Order Hijacking Black Basta used Qakbot, which has the ability to exploit Windows 7 Calculator to execute malicious payloads. T1543.003. | [] | Threat Assessment Black Basta Ransomware |
Windows Service Creates benign-looking services for the ransomware binary. | [
"T1543.003"
] | Threat Assessment Black Basta Ransomware |
TA0005 Defense Evasion T1484.001. | [] | Threat Assessment Black Basta Ransomware |
Group Policy Modification Black Basta can modify group policy for privilege escalation and defense evasion. T1218.010. | [
"T1484.001"
] | Threat Assessment Black Basta Ransomware |
System Binary Proxy Execution: Regsvr32 Black Basta has used regsvr32.exe to execute a malicious DLL. T1070.004. | [] | Threat Assessment Black Basta Ransomware |
Indicator Removal on Host: File Deletion Attempts to delete malicious batch files. | [
"T1070.004"
] | Threat Assessment Black Basta Ransomware |
T1112. | [] | Threat Assessment Black Basta Ransomware |
Modify Registry Black Basta makes modifications to the Registry. | [
"T1112"
] | Threat Assessment Black Basta Ransomware |
T1140. | [] | Threat Assessment Black Basta Ransomware |
Deobfuscate/Decode Files or Information Initial malicious .zip file bypasses some antivirus detection due to password protection. | [] | Threat Assessment Black Basta Ransomware |
T1562.001. | [] | Threat Assessment Black Basta Ransomware |
Impair Defenses: Disable or Modify Tools Disables Windows Defender with batch scripts, such as d.bat or defof.bat. | [
"T1059.003",
"T1562.001"
] | Threat Assessment Black Basta Ransomware |
T1562.004. | [] | Threat Assessment Black Basta Ransomware |
Impair Defenses: Disable or Modify System Firewall Uses batch scripts, such as rdp.bat or SERVI.bat, to modify the firewall to allow remote administration and RDP. | [
"T1059.003"
] | Threat Assessment Black Basta Ransomware |
T1562.009. | [] | Threat Assessment Black Basta Ransomware |
Impair Defenses: Safe Boot Mode Uses bcdedit to boot the device in safe mode. T1574.001. | [] | Threat Assessment Black Basta Ransomware |
Hijack Execution Flow: DLL Search Order Hijacking Black Basta used Qakbot, which has the ability to exploit Windows 7 Calculator to execute malicious payloads. T1622. | [] | Threat Assessment Black Basta Ransomware |
Debugger Evasion Uses IsDebuggerPresent to check if processes are being debugged. | [] | Threat Assessment Black Basta Ransomware |
TA0006 Credential Access T1555. | [] | Threat Assessment Black Basta Ransomware |
Credentials from Password Stores Black Basta uses Mimikatz to dump passwords. | [
"T1003.001"
] | Threat Assessment Black Basta Ransomware |
TA0007 Discovery T1087.002. | [] | Threat Assessment Black Basta Ransomware |
Account Discovery: Domain Account Used commands such as net user /domain and net group /domain. T1016. | [] | Threat Assessment Black Basta Ransomware |
System Network Configuration Discovery Lists internal IP addresses to target in C:\Windows\pc_list.txt – typically found on the Domain Controller. T1082. | [
"T1016"
] | Threat Assessment Black Basta Ransomware |
System Information Discovery Uses GetComputerName to query the computer name. | [
"T1082"
] | Threat Assessment Black Basta Ransomware |
T1622. | [] | Threat Assessment Black Basta Ransomware |
TA0008 Lateral Movement T1021.001. | [] | Threat Assessment Black Basta Ransomware |
Remote Services: | [] | Threat Assessment Black Basta Ransomware |
Remote Desktop Protocol Black Basta has used RDP for lateral movement. | [
"T1021.001"
] | Threat Assessment Black Basta Ransomware |
TA0009 Collection T1560.001. | [] | Threat Assessment Black Basta Ransomware |
Archive Collected Data: Archive via Utility TA0010 Exfiltration T1567. | [] | Threat Assessment Black Basta Ransomware |
Exfiltration over Web Service TA0011 Command and Control T1219. | [] | Threat Assessment Black Basta Ransomware |
Remote Access Software Black Basta has installed and used legitimate tools such as TeamViewer and AnyConnect on targeted systems. T1573. | [
"T1219"
] | Threat Assessment Black Basta Ransomware |
Encrypted Channel Uses Qakbot primarily and Cobalt Strike. | [] | Threat Assessment Black Basta Ransomware |
TA0040 Impact T1486. | [] | Threat Assessment Black Basta Ransomware |
Data Encrypted for Impact Black Basta modifies the Desktop background by adding a .jpg in C:\Temp and creating a registry key HKCU\Control Panel\Desktop. | [
"T1112"
] | Threat Assessment Black Basta Ransomware |
Additionally modifies the registry to change the icon of encrypted files. | [
"T1112"
] | Threat Assessment Black Basta Ransomware |
It encrypts files excluding those with a .exe, .cmd, .bat and .com extension. | [] | Threat Assessment Black Basta Ransomware |
Uses ChaCha20 or RSA-4096 to encrypt victims. T1489. | [] | Threat Assessment Black Basta Ransomware |
Service Stop Uses sc stop and taskkill to stop services. | [] | Threat Assessment Black Basta Ransomware |
T1490. | [] | Threat Assessment Black Basta Ransomware |
Inhibit System Recovery Black Basta deletes Volume Shadow Copies using vssadmin. | [] | Threat Assessment Black Basta Ransomware |
Table 1. | [] | Threat Assessment Black Basta Ransomware |
Tactics, techniques and procedures for Black Basta activity. | [] | Threat Assessment Black Basta Ransomware |
Victimology | [] | Threat Assessment Black Basta Ransomware |
The ransomware group and its affiliate program reportedly compromised multiple large organizations, in sectors including consumer and industrial products; energy, resources and agriculture; manufacturing; utilities; transportation; government agencies; professional services and consulting; and real estate. | [] | Threat Assessment Black Basta Ransomware |
Black Basta operators also posted on dark web forums expressing interest in attacking organizations based in Australia, Canada, New Zealand, the U.K. and the U.S. Threat actors using the ransomware impacted organizations based in the U.S., Germany, Switzerland, Italy, France and the Netherlands (listed in descending or... | [] | Threat Assessment Black Basta Ransomware |
Black Basta post on dark web forums. | [] | Threat Assessment Black Basta Ransomware |
The threat actor(s) responsible for Black Basta operate a cybercrime marketplace and victim name-and-shame blog. | [] | Threat Assessment Black Basta Ransomware |
This site is hosted as a Tor hidden service, where the Black Basta ransomware group lists their victims’ names, descriptions, percentage of stolen data which has been published, number of visits and any data exfiltrated. | [] | Threat Assessment Black Basta Ransomware |
There were 75 victims listed on the leak site at the time of writing. | [] | Threat Assessment Black Basta Ransomware |
Black Basta News site where the threat actors post allegedly breached organizations (details redacted) and number of visits. | [] | Threat Assessment Black Basta Ransomware |
Courses of Action Several adversarial techniques were observed in activity associated with Black Basta, and the following measures are suggested within Palo Alto Networks products and services to mitigate threats related to Black Basta ransomware, as well as other malware using similar techniques: Product / Service Cou... | [] | Threat Assessment Black Basta Ransomware |
The below courses of action mitigate the following techniques: Spear Phishing Attachment [T1566.001] THREAT PREVENTION Ensure that antivirus profiles are set to block on all decoders except 'imap' and 'pop3' Ensure a secure antivirus profile is applied to all relevant security policies NEXT-GENERATION FIREWALLS Set up ... | [] | Threat Assessment Black Basta Ransomware |
Generic V2 Execution The below courses of action mitigate the following techniques: Service Execution | [] | Threat Assessment Black Basta Ransomware |
[T1569.002], Windows Management Instrumentation | [] | Threat Assessment Black Basta Ransomware |
[T1047], PowerShell [T1059.001] NEXT-GENERATION FIREWALLS Ensure remote access capabilities for the User-ID service account are forbidden. | [] | Threat Assessment Black Basta Ransomware |
Ensure that User-ID is only enabled for internal trusted interfaces Ensure 'Service setting of ANY' in a security policy allowing traffic does not exist Ensure that security policies restrict User-ID Agent traffic from crossing into untrusted zones Ensure that the User-ID service account does not have interactive logon... | [] | Threat Assessment Black Basta Ransomware |
The below courses of action mitigate the following techniques: Create Account | [] | Threat Assessment Black Basta Ransomware |
[T1136], Account Manipulation [T1098], Regsvr32 | [] | Threat Assessment Black Basta Ransomware |
[T1218.010], File Deletion | [] | Threat Assessment Black Basta Ransomware |
[T1070.004], Disable or Modify Tools [T1562.001], Modify Registry | [] | Threat Assessment Black Basta Ransomware |
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