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250331-fzmvkawnz8Analysis
- max time kernel
600s - max time network
613s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20250314-en - resource tags
- submitted
31/03/2025, 00:22
General
- Target RansomwareSamples/BlackMatter_02_08_2021_67KB.exe
- Size 67KB
- Sample250331-apdw1ssjs8
- SHA256 22d7d67c3af10b1a37f277ebabe2d1eb4fd25afbd6437d4377400e148bcc08d6
Malware Config
Extracted
-
C:\0MjRYWHRy.README.txt
-
blackmatter
- ~+ * + ' BLACK | () .-.,='``'=. - o - '=/_ \ | * | '=._ | \ `=./`, ' . '=.__.=' `=' * + Matter + O * ' . >>> What happens? Your network is encrypted, and currently not operational. We have downloaded 1TB from your fileserver. We need only money, after payment we will give you a decryptor for the entire network and you will restore all the data. >>> What guarantees? We are not a politically motivated group and we do not need anything other than your money. If you pay, we will provide you the programs for decryption and we will delete your data. If we do not give you decrypters or we do not delete your data, no one will pay us in the future, this does not comply with our goals. We always keep our promises. >> Data leak includes 1. Full emloyeers personal data 2. Network information 3. Schemes of buildings, active project information, architect details and contracts, 4. Finance info >>> How to contact with us? 1. Download and install TOR Browser (https://www.torproject.org/). 2. Open http://supp24yy6a66hwszu2piygicgwzdtbwftb76htfj7vnip3getgqnzxid.onion/7NT6LXKC1XQHW5039BLOV. >>> Warning! Recovery recommendations. We strongly recommend you to do not MODIFY or REPAIR your files, that will damage them.
-
http://supp24yy6a66hwszu2piygicgwzdtbwftb76htfj7vnip3getgqnzxid.onion/7NT6LXKC1XQHW5039BLOV
Signatures
- BlackMatter Ransomware
BlackMatter ransomware group claims to be Darkside and REvil succesor.
- Blackmatter family
- Renames multiple (150) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
- Sets desktop wallpaper using registry 2 TTPs 2 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 6 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Modifies Control Panel 3 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 17 IoCs
- Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
-
C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\BlackMatter_02_08_2021_67KB.exe"C:\Users\Admin\AppData\Local\Temp\RansomwareSamples\BlackMatter_02_08_2021_67KB.exe"1⤵
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Modifies Control Panel
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
0MjRYWHRy.README.txt
memory/1760-0-0x00000000025D0000-0x00000000025E0000-memory.dmp
memory/1760-1-0x00000000025D0000-0x00000000025E0000-memory.dmp
memory/1760-195-0x00000000025D0000-0x00000000025E0000-memory.dmp
memory/1760-196-0x00000000025D0000-0x00000000025E0000-memory.dmp