Emooodldr — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 4938ef80579abd3e…

MALICIOUS

Office (OOXML) / .DOC

140.3 KB Created: 2021-11-15 15:39:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: 97b18705eb20d678681e39cc877b3d2a SHA-1: ea00c0c8267577eea3573068cd436c23df107f56 SHA-256: 4938ef80579abd3efdb5caa81ccd37648e771dfcd8eb6fb59789faf5c29002d9
302 Risk Score

Malware Insights

Emooodldr · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Xls.Downloader.Emooodldr-10031562-0. Static analysis revealed VBA macros, including a Document_Open macro, which is a common technique for automatic execution upon opening the document. The extracted VBA macro code appears to be designed to download and execute a second-stage payload, as indicated by the presence of functions like FileQueryRange and calls to GetObject, suggesting a downloader functionality. The presence of 'macros.bas' and 'vbaProject_00.bin' further supports the macro-based nature of this threat.

Heuristics 8

  • ClamAV: Xls.Downloader.Emooodldr-10031562-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emooodldr-10031562-0
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
  • 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/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e53e3734f5c43adf58370feee1b5707cc66f4a1c2cd43a48deedecacf5c12b3d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4433 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
4fc347b65d5564a468e53c51259b52bdc911632ab94be6440f0a92ccf7d46a22		 vba-project OOXML VBA project: word/vbaProject.bin 16896 bytes
Detection
ClamAV: Xls.Downloader.Emooodldr-10031562-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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