pngdowner

Description

(CrowdStrike) he pngdowner malware is a simple tool constructed using Microsoft Visual studio and implemented via single C++ source code file.

Initially, the malware will perform a connectivity check to a hard-coded URL (http://www.microsoft.com), using a constant user agent Mozilla/4.0 (Compatible; MsIE 6.0;). If this request fails, the malware will attempt to extract proxy details and credentials from Windows Protected storage, and from the IE Credentials store using publicly known methods, using the proxy credentials for subsequent requests if they enable outbound HTTP access. An initial request is then made to the hard-coded C2 server and initial URI – forming a URL of the form (in this sample) http://login.stream-media.net/files/xx11/index.asp?95027775, where the numerical parameter represents a random integer. A hard-coded user agent of myagent is used for this request, and subsequent communication with the C2 server.

Names

Name
pngdowner

Category

Malware

Type

  • Backdoor
  • Credential stealer

Information

Mitre Attack

Malpedia

Other Information

Uuid

37964559-63c8-4384-ad64-fdb22fd4796d

Last Card Change

2020-05-14