Static Unpacking For The Widespread NSIS-Based Malicious Packer Family


Packers or crypters are widely used to protect malicious software from detection and static analysis. These auxiliary tools, through the use of compression and encryption algorithms, enable cybercriminals to prepare unique samples of malicious software for each campaign or even per victim, which complicates the work of antivirus software.

In the case of certain packers, classifying malicious software without employing dynamic analysis becomes a challenging task. To analyze a malicious sample and extract its configuration data, such as encryption keys and command and control server addresses, we must first unpack it. We can do this by running the malicious software in a sandbox environment, such as CAPE, followed by extracting the memory dumps. However, this method has some drawbacks.

Read more…
Source: Check Point


Sign up for our Newsletter


Related:

  • Out of the Sandbox: WikiLoader Digs Sophisticated Evasion

    July 31, 2023

    Proofpoint researchers identified a new malware we call WikiLoader. It was first identified in December 2022 being delivered by TA544, an actor that typically uses Ursnif malware to target Italian organizations. Proofpoint observed multiple subsequent campaigns, the majority of which targeted Italian organizations. WikiLoader is a sophisticated downloader with the objective of installing a second malware ...

  • CISA Releases Malware Analysis Reports on Barracuda Backdoors

    July 28, 2023

    CISA has published three malware analysis reports on malware variants associated with exploitation of CVE-2023-2868. CVE-2023-2868 is a remote command injection vulnerability affecting Barracuda Email Security Gateway (ESG) Appliance, versions 5.1.3.001-9.2.0.006. It was exploited as a zero day as early as October 2022 to gain access to ESG appliances. According to industry reporting, the actors exploited ...

  • FIN8 Uses Revamped Sardonic Backdoor to Deliver Noberus Ransomware

    July 18, 2023

    Symantec’s Threat Hunter Team, a part of Broadcom, recently observed the Syssphinx (aka FIN8) cyber-crime group deploying a variant of the Sardonic backdoor to deliver the Noberus ransomware. While analysis of the backdoor revealed it to be part of the Sardonic framework previously used by the group, and analyzed in a 2021 report from Bitdefender, it ...

  • Detecting BPFDoor Backdoor Variants Abusing BPF Filters

    July 13, 2023

    Advanced persistent threat (APT) groups have broadened their focus to include Linux and cloud servers in the past few years. Noticeable examples include ransomware groups targeting VMware ESXi servers, Mirai botnet variants, and groups targeting the cloud with stealers and cryptomining malware. Similarly, APT groups have increased their presence on non-Windows targets. An example is Sandworm ...

  • Hunting for A New Stealthy Universal Rootkit Loader

    July 11, 2023

    In one of their recent threat hunting investigations, Trend Micro researchers came across an interesting new threat activity cluster that we initially thought was a false positive detection for a Microsoft signed file. However, this turned out to be a novel piece of a signed rootkit that communicates with a large command-and-control (C&C) infrastructure for an ...

  • The TOITOIN Trojan: Analyzing a New Multi-Stage Attack Targeting LATAM Region

    July 7, 2023

    This sophisticated campaign targeting LATAM region employs a trojan that follows a multi-staged infection chain, utilizing specially crafted modules throughout each stage. These modules are custom designed to carry out malicious activities, such as injecting harmful code into remote processes, circumventing User Account Control via COM Elevation Moniker, and evading detection by Sandboxes through clever ...