PowerDrive: Accurate De-obfuscation and Analysis of PowerShell Malware

UGARTE ARZAC, DENIS
Primo
;
Maiorca, Davide
Secondo
;
CARA, FABRIZIO
Penultimo
;
Giacinto, Giorgio
Ultimo
2019

Abstract

PowerShell is nowadays a widely-used technology to administrate and manage Windows-based operating systems. However, it is also extensively used by malware vectors to execute payloads or drop additional malicious contents. Similarly to other scripting languages used by malware, PowerShell attacks are challenging to analyze due to the extensive use of multiple obfuscation layers, which make the real malicious code hard to be unveiled. To the best of our knowledge, a comprehensive solution for properly de-obfuscating such attacks is currently missing. In this paper, we present PowerDrive, an open-source, static and dynamic multi-stage de-obfuscator for PowerShell attacks. Power-Drive instruments the PowerShell code to progressively de-obfuscate it by showing the analyst the employed obfuscation steps. We used Power-Drive to successfully analyze thousands of PowerShell attacks extracted from various malware vectors and executables. The attained results show interesting patterns used by attackers to devise their malicious scripts. Moreover, we provide a taxonomy of behavioral models adopted by the analyzed codes and a comprehensive list of the malicious domains contacted during the analysis.
Inglese
Detection of Intrusions and Malware, and Vulnerability Assessment
978-3-030-22037-2
978-3-030-22038-9
Springer
Roberto Perdisci, Clémentine Maurice, Giorgio Giacinto, Magnus Almgren
11543
1
21
21
Detection of Intrusions and Malware, and Vulnerability Assessment (DIMVA)
Comitato scientifico
19-20 Giugno 2019
Goteborg (Svezia)
scientifica
no
4 Contributo in Atti di Convegno (Proceeding)::4.1 Contributo in Atti di convegno
UGARTE ARZAC, Denis; Maiorca, Davide; Cara, Fabrizio; Giacinto, Giorgio
273
4
4.1 Contributo in Atti di convegno
none
info:eu-repo/semantics/conferencePaper
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