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Regular expression of NjRAT RAT/Backdoor Detector

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NjRAT remote access trojan was created based on the leaked Njw0rm source code, and it has a wide range of backdoor capabilities. Researchers from Trend Micro encounter a new fileless version of this malicious tool that is distributed through removable media. It is also impossible to exclude the version that initially trojan can penetrate the network of the organization via phishing emails. NjRAT uses AutoIt to compile the payload and the main script into a single executable to bypass antivirus solutions. When the installer is executed, the malware tries to delete Tr.exe from the system’s %TEMP% directory and install its own version of Tr.exe on it. Then it terminates Tr.exe process and executes a dropper, which installs a hidden copy of itself on any removable drive found on the infected system.

NjRAT remote access trojan has been used repeatedly in cyberespionage campaigns and is popular on underground forums. New fileless modification poses a threat to organizations that still use removable media in the workplace. For threat detection, the following are scripts by ELKStack, QRadar and Splunk.

  • Elastic Query
url.original:("http\:\/\/ghancommercialbank.com\/msn\/newclient.exe" OR "http\:\/\/f.top4top.net\/p_3667b75e1.png" OR "http\:\/\/f.top4top.net\/p_42526hb61.png" OR "http\:\/\/cdn.discordapp.com\/attachments\/482228034632548363\/506077641061826561\/doublepumpcheck.exe" OR "http\:\/\/cdn.discordapp.com\/attachments\/482925954109276160\/507526114491498496\/photoshop.exe" OR "https\:\/\/cdn.discordapp.com\/attachments\/436298448665575427\/481620773501534208\/111111111.exe" OR "http\:\/\/ldrldr.icu\/njr.exe" OR "http\:\/\/kapitanbomba.hopto.org\/file.exe" OR "https\:\/\/s3.us\-east\-2.amazonaws.com\/qued\/xwizard.exe" OR "https\:\/\/cdn.discordapp.com\/attachments\/498525611422121996\/507533173954183170\/Server.exe")
  • QRadar AQL
SELECT UTF8(payload) as search_payload from events where ("URL" = 'http://ghancommercialbank.com/msn/newclient.exe' or "URL" = 'http://f.top4top.net/p_3667b75e1.png' or "URL" = 'http://f.top4top.net/p_42526hb61.png' or "URL" = 'http://cdn.discordapp.com/attachments/482228034632548363/506077641061826561/doublepumpcheck.exe' or "URL" = 'http://cdn.discordapp.com/attachments/482925954109276160/507526114491498496/photoshop.exe' or "URL" = 'https://cdn.discordapp.com/attachments/436298448665575427/481620773501534208/111111111.exe' or "URL" = 'http://ldrldr.icu/njr.exe' or "URL" = 'http://kapitanbomba.hopto.org/file.exe' or "URL" = 'https://s3.us-east-2.amazonaws.com/qued/xwizard.exe' or "URL" = 'https://cdn.discordapp.com/attachments/498525611422121996/507533173954183170/Server.exe')
  • Splunk
(resource.URL="http://ghancommercialbank.com/msn/newclient.exe" OR resource.URL="http://f.top4top.net/p_3667b75e1.png" OR resource.URL="http://f.top4top.net/p_42526hb61.png" OR resource.URL="http://cdn.discordapp.com/attachments/482228034632548363/506077641061826561/doublepumpcheck.exe" OR resource.URL="http://cdn.discordapp.com/attachments/482925954109276160/507526114491498496/photoshop.exe" OR resource.URL="https://cdn.discordapp.com/attachments/436298448665575427/481620773501534208/111111111.exe" OR resource.URL="http://ldrldr.icu/njr.exe" OR resource.URL="http://kapitanbomba.hopto.org/file.exe" OR resource.URL="https://s3.us-east-2.amazonaws.com/qued/xwizard.exe" OR resource.URL="https://cdn.discordapp.com/attachments/498525611422121996/507533173954183170/Server.exe")

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