Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1f4eb218f8b0d0b6…

MALICIOUS

Office (OLE)

852.5 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 58ff46447afe1b466e2d95debe1fd3d4 SHA-1: a0d05e5c2786fcaa3c9fb8f84646bb2ad1697915 SHA-256: 1f4eb218f8b0d0b65932d1662dd16993897ba907b006776b0435e56cd32193b2
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

This Excel document contains VBA macros that utilize Shell() calls and references to Windows Script Host, VirtualAlloc, LoadLibrary, and GetProcAddress APIs. It also embeds a PE executable. The primary function appears to be acting as a dropper for the embedded executable, which is likely responsible for downloading and executing additional malicious payloads. The presence of the embedded PE and the API calls strongly suggest a malicious dropper.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Embedded PE executable critical OLE_EMBEDDED_EXE
    MZ/PE header found inside document — possible embedded executable
  • ClamAV: Win.Dropper.Hideproc-6663113-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Hideproc-6663113-0
  • 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.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • 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://www.microsoft.com0
    • http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl0X
    • http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_08-31-2010.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_08-31-2010.crt0
    • http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
    • http://www.microsoft.com/pki/certs/MicrosoftRootCert.crt0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
888c70d21f83f913161586d9572083be4266d3106ae0f87526fc31f336071aa6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14358 bytes
embedded_office_000044f1.exe
5866bf6b58328a0fffaa5304b95a4e0831da179ef917b64874e00f47d8f7fe79		 embedded-pe Office MZ+PE at offset 0x44F1 855311 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
9dc5a0bfb900a50933edcd585ffcbc4bed2af044e653c6df90ad0229c5fd64db		 ole-package OLE Ole10Native stream: MBD00059305/Ole10Native 618013 bytes

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