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

Static analysis result for SHA-256 cf0f7d178b74a724…

MALICIOUS

Office (OOXML) / .XLSM

23.7 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: dbad290342a0f6cd2554a4d7b06ff400 SHA-1: ea9e6a18734a7a389eaa66eace35c84ede9152c3 SHA-256: cf0f7d178b74a724d306e95469e7e3a8a8974c69a659a365ab8f1c129a69ec10
268 Risk Score

Malware Insights

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

The critical ClamAV heuristic firings indicate this file is a known malicious dropper. The presence of a Workbook_Open macro and CreateObject calls strongly suggests the VBA code is designed to execute automatically upon opening the spreadsheet. This macro likely downloads and executes a second-stage payload, as indicated by the 'Doc.Dropper.Agent' ClamAV signature. The embedded URL, while benign according to its label, is present in the document body.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://www.linkedin.com/in/laurasilvae4890/
  • 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/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • https://www.linkedin.com/in/laurasperandio4890/_________________

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0d723be671fd4893b256b4df1171201ac7346a1a28a4ad18388f286f2dbb5339		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5440 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 13 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
f66a638cf152731a2840ac0df2ceb3edfa5f28a2a7ff8672e37078b7b32f6c7b		 vba-project OOXML VBA project: xl/vbaProject.bin 26112 bytes
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
emf_00.emf
0267043ae8226cfe96b45529d3a701b5936758f28b966c55c3bbe76c4bf606f2		 ooxml-emf OOXML EMF part: xl/media/image1.emf 1108 bytes
emf_01.emf
369338825a91500392b48326331c6451b0494d846e45e388aea87d357464b35a		 ooxml-emf OOXML EMF part: xl/media/image2.emf 1108 bytes

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