Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cad79c9a2cfbb427…

MALICIOUS

Office (OLE)

942.0 KB Created: 2019-08-30 09:14:50 Authoring application: Microsoft Excel
MD5: 0ca527054c7c8a7a1e91611c301994c3 SHA-1: b85e2ded9cd1cc55fed5398a3598a2cf0de9b426 SHA-256: cad79c9a2cfbb42745a0e2b391001eb5c7073cfc5487070918b0bc20c3aca3fa
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1059.001 PowerShell

The file is an Office document containing VBA macros that exhibit malicious behavior. Heuristics indicate the use of Windows Script Host and critical API calls such as VirtualAlloc, LoadLibrary, and GetProcAddress, suggesting the execution of a second-stage payload. An embedded PE executable was also detected, further supporting the dropper functionality. The presence of the Shell() call in VBA confirms the execution of external code.

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
fa5e4ec9891f7b0845db2c4d2107eac4df99c36d153ca81e6ed89b973be49766		 embedded-pe Office MZ+PE at offset 0x44F1 946959 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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