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

Static analysis result for SHA-256 03d5ed378d9fd4fc…

MALICIOUS

Office (OLE) / .XLS

134.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 98f6572ec1148578e447bd8abfd49263 SHA-1: f8b3bc10590de3771a293cbf25474d93a7290f1c SHA-256: 03d5ed378d9fd4fc97f7fe5775818b5f1f6ce6feee2e04539bd640a1c21044c7
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The file is an Excel spreadsheet containing VBA macros, including Auto_Open and Auto_Close routines. Critical heuristics indicate obfuscated API calls to 'URLDownloadToFile', suggesting the macros are designed to download and execute a second-stage payload from one of the embedded URLs. The ClamAV detection name 'Doc.Downloader.Docusign112100-9908075-0' further supports this downloader functionality.

Heuristics 6

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • ClamAV: Doc.Downloader.Docusign112100-9908075-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign112100-9908075-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://194.36.191.13/
    • http://23.106.122.207/
    • http://101.99.90.115/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0d2f7bbfe3a5094c168f134f24b441e08e62cbdd16423a252e08944181688ba8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4951 bytes

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