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

Static analysis result for SHA-256 341d437922bda31c…

MALICIOUS

Office (OLE) / .XLS

1.39 MB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 338fe3735496cf67c7c04cbed955d660 SHA-1: a0543538ac609a29e0f832ddc8291f680ef13a13 SHA-256: 341d437922bda31c16f162a15c839b6e777d5154a49846b440c5a81f4e466a8c
190 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV and contains VBA macros. Heuristics indicate the use of CreateObject and CallByName, common for executing malicious code. The VBA macro likely attempts to download and execute a second-stage payload, as suggested by the 'Dr5ko' subroutine and the presence of a macro file named 'macros.bas'. The document also contains a lure to enable macros, a typical tactic for macro-based malware.

Heuristics 7

  • ClamAV: Xls.Malware.Exvk-9785252-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Exvk-9785252-0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
62ad0b6dd051e43985f4df0e703aa41b4a769b72d9ea141ab3d437fc063127a1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3777 bytes

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