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

Static analysis result for SHA-256 41704fc363647c87…

MALICIOUS

Office (OLE) / .XLS

808.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 0aab6d01bd5672e776682859d42dcd35 SHA-1: 2cc1355db6cf4c56595a3810755c82ac9d746e8d SHA-256: 41704fc363647c874b687c46d8b801da119cea533e99458713c768f592644f12
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLS file containing VBA macros that utilize Shell(), VirtualAlloc, LoadLibrary, and GetProcAddress, indicating dynamic code execution. A critical heuristic identified an embedded PE executable, and ClamAV detected it as Win.Dropper.Hideproc-6663113-0. The VBA macro likely downloads and executes a second-stage payload from the unknown URL http://www.microsoft.com0, which is highly suspicious given its benign counterparts. The embedded executable is the primary payload.

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
56be25cbb6875a49ad962ac7fa31f271de6c58edf73c655f0e6ec6ff2847baa8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 14372 bytes
embedded_office_000044f1.exe
66df57096bc04be5f9bbbfb06eb70b3d9bd6e26af42f8baec0ced52620a38c26		 embedded-pe Office MZ+PE at offset 0x44F1 809743 bytes
Detection
ClamAV: Win.Dropper.Hideproc-6663113-0
Obfuscation or payload: unlikely
ole10native_00.bin
19b52f1add3d684446fd404d2b90f24697030288cf5c2c5ba0e06da52f179e3d		 ole-package OLE Ole10Native stream: MBD0090C244/Ole10Native 614941 bytes

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