r57shell — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 f373b89db1268cc9…

MALICIOUS

Office (OLE) / .DOC

509.5 KB Created: 2010-03-30 15:53:00 Authoring application: Microsoft Office Word First seen: 2026-05-11
MD5: f3ee8391e1dc403478464161c2640821 SHA-1: e0a147d8d58be32a051ead05a60715508ce07f18 SHA-256: f373b89db1268cc98fed8c05d8509dbe278048a0ccaebbe67bacecf4d629b88e
102 Risk Score

Malware Insights

r57shell · confidence 75%

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The document contains a heuristic firing for 'SE_CLIPBOARD_COMMAND_LURE', indicating it instructs the user to copy and paste commands into a shell. The embedded PHP code, identified as 'r57shell', is a known web shell often used for remote administration and execution of arbitrary commands. Although VBA macros could not be extracted due to an unsupported format, the presence of the web shell code and the lure strongly suggest an attempt to gain remote access or execute further malicious payloads. The embedded URLs are likely related to the hosting or command-and-control infrastructure.

Heuristics 3

  • PHP webshell / backdoor source critical WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (r57shell)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://rst.void.ru In document text (OLE body)
    • http://www.antichat.ruIn document text (OLE body)