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LanRan Ransomware

Posted: April 5, 2017

Threat Metric

Threat Level: 10/10
Infected PCs: 29
First Seen: April 5, 2017
OS(es) Affected: Windows

The LanRan Ransomware is a member of the My Little Ransomware family of file-encrypting Trojans, which lock your files until you pay their ransoms. While the LanRan Ransomware's encryption feature is unfinished, malware experts anticipate further updates to the threat and recommend protecting your PC by backing up your files to locations not vulnerable to an infection. Use anti-malware products to find and remove the LanRan Ransomware before its installation.

An Eyeful of a Ransom-Collecting Trojan's Development in Progress

The My Little Ransomware family is one of the smallest groups of open-source, ransom-based threats, but does include new members periodically. After old threats like the M0on Ransomware, malware experts can confirm a new one finally: the LanRan Ransomware, which can lock your screen despite missing other features that one would expect for any Trojan of its category. Since the Trojan is under analysis early in its development, no data yet is known about how its threat actors plan to distribute it to their victims' PCs.

Although its original family includes encryption features, the LanRan Ransomware's authors chose to remove these temporarily, possibly to make updates to the algorithms it uses. The LanRan Ransomware does drop a ransom note on the infected PC, with text as if the Trojan has encrypted your files and blocked you from opening your documents, images, etc. successfully. The LanRan Ransomware launches its note in the format of a screen-locking pop-up window that blocks your desktop access to encourage paying its ransoms. Other than a button for copying the threat actor's cryptocurrency wallet address, the LanRan Ransomware's pop-up includes no interactive features.

Victims also may see other symptoms from the LanRan Ransomware infections, including text-to-voice audio. Perhaps most threatening, malware analysts confirm that the LanRan Ransomware distributes copies of itself to the root directories of all the PC's drives, a worm-like feature that could help it propagate over networks and removable devices.

Deconstructing the Early Foundation of Ransoming Trojans

The current version of the LanRan Ransomware can only lock your screen and block you from using other software without damaging any files in perpetuity. Use Safe Mode or boot your PC from another device to avoid loading the LanRan Ransomware's ransom message. However, the LanRan Ransomware's authors are anticipated to continue working on this threat and may include other features, file-encrypting ones, for future builds particularly.

With its infection methods still unpredictable, the LanRan Ransomware may arrive through various sources, including spam e-mails, compromised websites and modified downloads. Threat actors also could choose to install the LanRan Ransomware manually after gaining network access to a PC, although the LanRan Ransomware's design elements are more indicative of low-key attacks against individuals, rather than companies. Anyone concerned about its potential damages should back their files up to a peripheral device or external server, and use anti-malware products for deleting the LanRan Ransomware before it can do any harm.

Unfinished or not, the LanRan Ransomware is a small part of the overall tide of frantic extortionist Trojan development. Assuming that a file, once saved, is always safe from further tampering, is a quick way to end up paying Bitcoins to con artists like those designing the LanRan Ransomware.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



file.exe File name: file.exe
Size: 109.05 KB (109056 bytes)
MD5: 1b3985282cef9d022dba3440bb21451d
Detection count: 71
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
file.exe File name: file.exe
Size: 214.02 KB (214026 bytes)
MD5: 8fd7c9c1a66ee4eb1445589f31f2dbbf
Detection count: 69
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
file.exe File name: file.exe
Size: 214.01 KB (214016 bytes)
MD5: e168392066c6d00c6de6b71c82adcdb3
Detection count: 52
File type: Executable File
Mime Type: unknown/exe
Group: Malware file

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