Guest submission byTaneli Kaivola, Patrik Nisn and Antti Nuopponen of NIXU
TorrentLocker is a new breed of ransomware that has been spreading lately. Like CryptoLocker and CryptoWall it encrypts files on a victim's machine and then demands ransom. The victim has to pay to get the decryption software that can decrypt the files.
On a recent incident response case we came across a malware program that had all the known characteristics of TorrentLocker. We started to analyze the malware to see if there was a way to get the files decrypted without paying the ransom. It is well known that some ransomwares like CryptoLocker do implement proper encryption and that it is not possible to recover the encrypted files, but on the other hand, there are also several examples of malware that
System Monitor (Sysmon) is a new tool from Microsoft, designed to run in the Windows system's background, logging details related to process creation, network connections, and changes to file creation time. This information can assist in troubleshooting and forensic analysis of the host where the tool was installed prior to the incident that's being investigated. This article explores the role that System Monitor might play in a malware analysis lab, possibly supplementing tools such as Process Monitor.
(This is a Spanish translation of the article Mastering 4 Stages of Malware Analysis. Este artculo fue traducido del ingls.) El anlisis de software malicioso o malware involucra una variedad de tareas, algunas ms simples que otras. Estas tareas pueden ser agrupadas en etapas basadas en la naturaleza de las tcnicas de anlisis de software malicioso. Agrupadas como capas, una encima de otra, estas etapas forman una pirmide que va creciendo conforme complejidad.
SRP streams in Microsoft Office documents can reveal older versions of VBA macro code used by the adversary in earlier attacks. After the attacker modifies the malicious document for a new attack, Microsoft Office sometimes retains a cache of the earlier macro inside these streams, allowing analysts to expand their understanding of the incident and derive valuable threat intelligence. In other words, SRP streams can help investigators travel back in time.
Keeping track of all the samples on your plate can become cumbersome and at times, next to impossible; that's where projects like Viper come in. Viper is "a framework to store, classify and investigate binary files." The following article, contributed by David Westcott, explains how to get started with this tool.