Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 5b33452d62a0d83f…

MALICIOUS

Office (OLE) / .XLS

380.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 7fd65cfc7f20c6fa1dd77109dce2ac8f SHA-1: f1788caf192ff6a988c103cee7089ce712f209a4 SHA-256: 5b33452d62a0d83fdb76eac03bc791f6d23b4d8da1dfa1a9baf519d0e45f0712
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code upon opening. The macros appear to be designed to download and execute a second-stage payload from one of the embedded URLs. The document also contains a lure to enable macros, further supporting its malicious intent.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 https://hermescomm.net/x9NvrhL0/lena.html
    • https://asistenciajuridicaintegral.com/6YiCkNix5/lena.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
be629cb484f8d82e38c4234ddbad4f1755e762b9c1c8359642d99f8c77e6e858
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 8812 bytes