March 3, 2020

New PwndLocker Ransomware Targeting U.S. Cities, Enterprises

New PwndLocker Ransomware Targeting U.S. Cities, Enterprises

(Reblogged from the original post at: Bleeping Computer)

Driven by the temptation of big ransom payments, a new ransomware called PwndLocker has started targeting the networks of businesses and local governments with ransom demands over $650,000. This new ransomware began operating in late 2019 and has since encrypted a stream of victims ranging from local cities to organizations. BleepingComputer has been told that the ransom amounts being demanded by PwndLocker range from $175,000 to over $660,000 depending on the size of the network.

It is not known if any of these victims have paid at this time.

PwndLocker says they encrypted Lasalle County’s network A source recently told BleepingComputer that the ransomware attack against Lasalle County in Illinois was conducted by the operators of the PwndLocker Ransomware.

When asked by BleepingComputer, the ransomware operators said they are behind the attack and are demanding a 50 bitcoin ransom ($442,000) for a decryptor.

The attackers have also told BleepingComputer that they have stolen data from the county before encrypting the network but did not provide any proof of this claim.

Local media reports that Lasalle County has no plans on paying the ransom.

BleepingComputer has contacted Lasalle County via email for confirmation but the emails were rejected. We have also left a voicemail but have not heard back at this time.

Update 3/3/2020: PwndLocker has also encrypted the network for the City of Novi Sad in Serbia.

The PwndLocker Ransomware In a sample shared with BleepingComputer by MalwareHunterTeam, when executed PwndLocker will attempt to disable a variety of Windows services using the ‘net stop’ command so that their data can be encrypted.

Some of the applications whose services are targeted include Veeam, Microsoft SQL Server, MySQL, Exchange, Acronis, Zoolz, Backup Exec, Oracle, Internet Information Server (IIS), and security software such as Kaspersky, Malwarebytes, Sophos, and McAfee.

The ransomware will also target various processes and terminate them if detected. Some of the processes targeted include Firefox, Word, Excel, Access, and other processes related to security software, backup applications, and database servers.

PwndLocker will now clear the Shadow Volume Copies so that they cannot be used to recover files with the following commands:

vssadmin.exe delete shadows /all /quiet vssadmin.exe resize shadowstorage /for=D: /on=D: /maxsize=401MB vssadmin.exe resize shadowstorage /for=D: /on=D: /maxsize=unbounded Once the system has been prepped for encryption, PwndLocker will begin to encrypt the computer.

While encrypting files, it will skip any files that contain one of the following extensions.

.exe, .dll, .lnk, .ico, .ini, .msi, .chm, .sys, .hlf, .lng, .inf, .ttf, .cmd, .bat, .vhd, .bac, .bak, .wbc, .bkf, .set, .win, .dsk The ransomware will also skip all files located in the following folders:

$Recycle.Bin Windows System Volume Information PerfLogs Common Files DVD Maker Internet Explorer Kaspersky Lab Kaspersky Lab Setup Files WindowsPowerShell Microsoft Microsoft.NET Mozilla Firefox MSBuild Windows Defender Windows Mail Windows Media Player Windows NT Windows Photo Viewer Windows Portable Devices Windows Sidebar WindowsApps All Users Uninstall Information Microsoft Adobe Microsoft Microsoft_Corporation Packages Temp When encrypting files, MalwareHunterTeam has seen it using the .key and .pwnd extensions depending on the victim. The sample BleepingComputer analyzed uses the .key extension as shown below.

Files encrypted by PwndLocker

Files encrypted by PwndLocker
When done encrypting, ransom notes named H0w_T0_Rec0very_Files.txt will be located throughout the computer and on the Windows desktop.

These ransom notes will contain an email address and Tor payment site that can be used to get payment instructions and the ransom amount.

PwndLocker Ransom Note

PwndLocker Ransom Note
The PwndLocker Payment Site allows victims to decrypt two files for free, talk to the ransomware operators and contains the ransom amount in bitcoins.

PwndLocker Tor Payment Site

PwndLocker Tor Payment Site
It is not known at this time if there are any weaknesses in the encryption algorithm.

IOCs

Known Extensions:

.key
.pwnd

Associated Files:

H0w_T0_Rec0very_Files.txt
C:\Programdata\lock.xml

Ransom Note Text:

Your network have been penetrated and encrypted with a strong algorythm
Backups were either removed or encrypted
No one can help you to recover the network except us
Do not share this link or email. Otherwise, we will have to delete the decryption keys
To get your files back you have to pay the decryption fee in BTC.
The price depends on the network size, number of employess and annual revenue.
Download TOR-Browser: https://www.torproject.org/download/
Login ax3spapdymip4jpy.onion using your ID xxxx
or
contact our support by email xxx@xxx.com
You'll receive instructions inside.
You should get in contact with us within 2 days after you noticed the encryption to have a good discount.
The decryption key will be stored for 1 month.
The price will be increased by 100% in two weeks
We also have gathered your sensitive data.
We would share it in case you refuse to pay
Do not rename or move encrypted files
Decryption using third party software is impossible.
Attempts to self-decrypting files will result in the loss of your data.

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