Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 7b7c5326b18bef56…

MALICIOUS

Office (OOXML) / .XLSM

157.5 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300
MD5: 929a68731c86be15437f06316930bb33 SHA-1: 5edd680f4bc8d37a65377de7e0ebd0e711a9a35a SHA-256: 7b7c5326b18bef5699fea4df81fd4b3e42d3af00b98e17458d8493286ff3b20a
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The XLSM file contains a Workbook_Open VBA macro that executes upon opening. This macro uses CreateObject to load an XML document from the URL http://moonshine-mht.best/chrome.jpg and then transforms it, likely to download and execute a second-stage payload. The ClamAV detection 'Doc.Dropper.Agent-7890555-0' further supports its nature as a dropper.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-7890555-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7890555-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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://moonshine-mht.best/chrome.jpg

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5a24842a5db644719a560e757012a9637834786c0199b0442e63a716f9d164ad		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 909 bytes
vbaProject_00.bin
828376fd869c35e2d1eeb360a9f5da71d40174047fc187c7a04f95da620bceaa		 vba-project OOXML VBA project: xl/vbaProject.bin 13824 bytes

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